- 李耀虎;LOU Wenbo;潘红飞;
We successfully incorporated phenyl groups into a small-molecule quaternary ammonium cross-linker and synthesized cross-linked polybenzimidazole membranes via a one-step cross-linking process. Compared with conventional quaternary ammonium-crosslinked benzimidazole membranes, the introduction of phenyl groups significantly increases the free volume within the membrane. After phosphoric acid doping, the benzimidazole membrane with larger free volume retains more phosphoric acid compared to conventional quaternary ammonium-crosslinked membranes, forming an extensive hydrogen-bonding network that effectively enhances its anhydrous proton conductivity. The anhydrous proton conductivity reaches 91 mS·cm~(-1) at 160 ℃, substantially higher than that of conventional quaternary ammonium-crosslinked membranes with the same mass fraction. Benefiting from the improved conductivity, the membrane electrode assembly exhibits reduced ohmic polarization, achieving a peak power density of 792 mW·cm~(-2) at 160 ℃.
2026年02期 v.41;No.190 285-295页 [查看摘要][在线阅读][下载 1171K] - 李竹馨;LI Xufeng;SHU Qingzhu;MA Kai;YU Hongquan;ZHANG Yong;LIU Shuhong;赵红;
We proposed a strategy to address the issue by synthesizing MnO with half-filled 3 d electron orbitals.That is,MnO nanocubes with an edge length of 61.82 nm were successfully prepared through electros-pinning and one-step pyrolysis as the cathode electrode for Li-O_2 batteries.It is observed that the intermediate LiMnO_4 rather than Li_2O_2 is formed when LiO_2 interactes with MnO (111) during the discharge process.It is precisely because of LiMnO_4 that reduces its charge overpotential to 0.29 V.The novel reaction mechanism dominated by LiMnO_4 further facilitates the lower charge overpotential,thereby enhancing the energy efficiency of the batteries.
2026年02期 v.41;No.190 296-303页 [查看摘要][在线阅读][下载 1168K] - 罗雨书;TENG Zixuan;SU Sicheng;MIAO Wenli;ZHANG Chaocan;WU Lili;陈万煜;
The preparation of ionic liquid gel electrolyte can reduce the occurrence of side effects and extend battery life.In the DMSO-ILZE electrolyte composed of DMSO,1-ethyl-3-methylimidazole tetrafluoroborate (EMIMBF_4) and Zn(BF_4)_2,the supramolecular gelator β-cyclodextrin (β-CD) was added,and then a gel electrolyte (CD-ILZE) for zinc-ion batteries was prepared through host-guest interaction between β-CD and DMSO-ILZE electrolyte.The gel electrolyte has good conductivity between-30 and 80℃,which is found by fitting the Arrhenius equation that the gel electrolyte satisfies the liquid law within this temperature range.In addition,the supramolecular gel electrolyte can effectively decrease hydrogen evolution corrosion and the formation of zinc dendrites.Compared with the battery prepared by DMSO-ILZE electrolyte (about 1 100 h),the prepared Zn||Zn battery exhibits a more stable cycle (over 2 800 h) at a current density of 0.5 m A·cm~(-2).At 0.1 A·g~(-1),the prepared Zn||V_2O_5 gel electrolyte cell has a capacity of 30 m Ah·g~(-1) and a capacity retention rate of 85.17%after more than 1 500 cycles.The CD-ILZE supramolecular gel electrolyte can inhibit the formation of hydrogen evolution corrosion and zinc dendrites,and improve the cycling performance of the battery.
2026年02期 v.41;No.190 304-314页 [查看摘要][在线阅读][下载 1483K] - 赵俊;王维;ZHAN Chun;GAO Guangwei;LI Hao;ZHANG Shikai;肖生强;
A novel n-dopant, 10-(1,3-dimethyl-2,3-dihydro-1H-benzo[d]imidazol-2-yl)-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]thieno[2,3-f]quinoline(ThJLBI), was developed from the benchmark n-dopant of NDMBI with benzimidazoline backbone, by switching its electron-donating dimethylaniline group to thienojulolidine. Encouragingly, an improved thermoelectric performance over N-DMBI was achieved when doping the representative n-type polymer ThDPP-CNBTz, with a maximum electrical conductivity of 35.4 S·cm~(-1) and a power factor of 34.17 μW·m~(-1)·K~(-2) at the optimized doping concentrations of 40 mol%. This work enriches the library of current n-dopants, which can provide the room for developing high-performance n-type polymeric thermoelectrics.
2026年02期 v.41;No.190 315-322页 [查看摘要][在线阅读][下载 1149K] - 王栋梁;DOU Jianming;张继林;YI Xiangbin;MA Furong;
SiCp-reinforced 6092Al composites with volume fractions of 25% and 60% were prepared using a powder metallurgy method. Their friction and wear characteristics were analyzed using a reciprocating friction and wear testing machine under loads of 20 to 50 N against YG6 cemented carbide. The experimental results show that the friction coefficients of all samples increase with increasing load. The 25vol% composite exhibits the lowest friction coefficient(0.1669-0.2716), while the 60vol% composite exhibits the highest(0.3237-0.3990), with the 6092 aluminum alloy falling between the two. The wear volume and specific wear rate also increase with load, but the composites with a higher Si C content demonstrate smaller increments, with the 60vol% composite exhibiting superior wear resistance. Under a 30 N load, the wear scars of the 60vol% composite show a significant increase in the contents of elements such as C, Co, W, and O, indicating more severe wear of the counterpart material. Scanning electron microscopy(SEM) reveals wear mechanisms including adhesive wear, two-body sliding and three-body rolling wear of particles, and delamination.
2026年02期 v.41;No.190 323-332页 [查看摘要][在线阅读][下载 1412K] - 江宇达;张睿智;LIU Shuaixiong;ZHOU Yiheng;GUO Chengcheng;CHEN Han;ZHANG Jian;LUO Guoqiang;SHEN Qiang;
We used hydrodynamic simulations and shock wave propagation theories to analyze the behavior of shock waves within Ti/Pt periodically modulated graded structures and their integration layers. The effects of the total number of periodic layers, the total thickness of graded materials and loading velocity on the integration layer thickness and behavior of pressure-strain rate were systematically investigated. The results reveal that, by adjusting the total number of periodically modulated layers, the total thickness of graded materials and loading velocity the pressure amplitudes of the reflected compressive and rarefaction waves at different interfaces of Ti/Pt periodically modulated graded materials can be precisely controlled. Furthermore, empirical structural design criteria for Ti/Pt periodically modulated graded materials are established. The thickness ratio variation between adjacent Ti/Pt layers in the periodic structure must exceed 0.32. After the collaborative design of the integration layer, Ti/Pt periodically modulated graded materials can achieve a controllable loading function with pressures ranging from 1.4 to 144 GPa and strain rates from 3.8×10~4 to 1.7×10~7 s~(–1). The outcomes of this research provide a theoretical and simulation basis for the optimized design of periodically modulated graded materials to be utilized in ramp compression experiments.
2026年02期 v.41;No.190 333-345页 [查看摘要][在线阅读][下载 1333K] - 郑琛夕;CHEN Cheng;LIAO Jun;张海宁;
Silica nanoparticles-stabilized cobalt and nitrogen-doped carbon materials were synthesized through pyrolysis of metal-organic-framework of ZIF-67 supported by silica nanoparticles. The experimental results reveal that the introduction of the silica nanoparticles can stabilize the microstructure of the derived CoN-C materials, which in turn exhibits the promising electrocatalytic activity towards both oxygen reduction and oxygen evolution reactions. The optimized sample exhibits a better oxygen reduction activity than commercial Pt/C catalyst as confirmed by the positive shift of half-wave potential by 20 mV while it has a low overpotential of 273 mV for oxygen evolution reactions with the retained performance over 80% after 25,000 s of continuous operation. It is demonstrated that the introduction of support frame might be an effective way to improve the activity and stability of metal-organic-framework derived electrocatalyst with stabilized microstructure.
2026年02期 v.41;No.190 346-352页 [查看摘要][在线阅读][下载 1089K] - 严明;DENG Yuxiao;YAN Zhuanlong;LI Hongyu;CAO Mengyang;
This study reported the synthesis of magnetic solid solutions V2(A_xB_ySn_(1-x-y))C(where A and B are Mn, Fe, or Co) MAX phases. These materials were prepared by incorporating magnetic elements into the V_2 SnC MAX phase via pressure-less sintering at 1 000 ℃ for 3 hours. XRD analysis reveals that the composition with x = y = 0.2 exhibits a shift of diffraction peaks to higher angles, indicating lattice parameter changes, and achieves the highest phase purity with the maximum solid solution limit, further increases in the dopant content led to the formation of impurities. While the solid solution of magnetic elements preserves the characteristic layered structure of the MAX phase, it successfully induces magnetic properties. The magnetic transition temperatures for these solid solutions ranges from 61 to 200 K. Specifically, V_2(Mn_xCo_ySn_(1-x-y))C demonstrated hard magnetic characteristics, with a high saturation magnetization(6.536 emu/g) and large remanence(4.236 emu/g). In contrast, V_2(Mn_xFe_ySn_(1-x-y))C and V2(Fe_xCo_ySn_(1-x-y))C exhibits soft magnetic behavior, evidenced by their narrow hysteresis loops and low coercivity. Their saturation magnetization values are 3.80 and 1.784 emu/g, respectively. The distinctly "S"-shaped hysteresis loop of V_2(Fe_xCo_ySn_(1-x-y))C further confirms its soft magnetic nature.
2026年02期 v.41;No.190 353-363页 [查看摘要][在线阅读][下载 1383K] - 王俊杰;LI Yijie;LI Xinyi;郭冬云;
Bi/Bi_2Fe_4O_9 nanocomposites consisting of Bi_2Fe_4O_9 nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi_2Fe_4O_9 nanosheet surfaces was attributed to the reducibility of 2-methoxyethanol in the precursor solution.Comparative photocatalytic evaluation reveals that the Bi/Bi_2Fe_4O_9 nanocomposites significantly enhance the degradation efficiency(99.0%) of bisphenol A compared with Bi_2Fe_4O_9 nanosheets (64.2%) under 120 min simulated solar irradiation.This remarkable enhancement can be attributed to the established Bi/Bi_2Fe_4O_9 heterojunction structure,which effectively facilitates the separation of photogenerated electron-hole pairs and accelerates interfacial charge transfer between the metallic Bi nanodots and semiconductor Bi_2Fe_4O_9 nanosheets.The synergistic effects arising from this unique architecture ultimately lead to superior photocatalytic performance.
2026年02期 v.41;No.190 364-370页 [查看摘要][在线阅读][下载 1070K] - 田森;ZHAO Longyin;杨兰;
We synthesized Ru_1 Cu_(25)P_(7.5)/TiO_2 catalyst using sodium borohydride(NaBH_4) as reductant in a facile strategy. The highly dispersed RuCuP nanoclusters are anchored on the TiO_2 surface with an average particle size of 2.62 nm. The catalyst shows excellent catalytic activity when applied to the hydrolysis of AB, which owns a high turnover frequency value of 531.56 mol_(H2)mol_(Ru)~(-1)min~(-1) and a low activation energy of 46.38 kJ · mol~(-1), it also exhibits good durability which maintains 61.13% initial activity after five cycles. The high catalytic performance of Ru_1 Cu_(25)P_(7.5)/TiO_2 may be attributed to the synergistic effects between Ru, Cu, and P elements, fine particle size, good dispersion, and the tight adhesion between nanoclusters and carrier.
2026年02期 v.41;No.190 371-380页 [查看摘要][在线阅读][下载 1236K] - 赵哲;徐立新;YANG Jiale;SI Jiahui;ZHU Song;JIANG Changjun;
As the speeds of trains increase, higher demands are placed on brake materials. In order to overcome the thermal degradation phenomenon of brake pads during high-speed braking, we prepared copper fiber reinforced alkali-activated slag composite(AASC) friction materials by hot-pressing method, using slag as matrix, Na_2 SiO_3·9H_2O as alkali excitant, copper fiber as reinforcement, and graphite as friction modifier. The results show that the AASC prepared by hot-pressing method has undergone alkali-activated reaction and has geopolymer amorphous characteristics as the conventional cast molding AASC by XRD analysis. The addition of copper fibers can improve the mechanical strength and toughness of the composites substantially, and the AASC has the highest flexural strength, compressive strength and impact toughness when the volume fraction of copper fibers reaches 25 vol%. Toughening mechanisms such as drawing, bridging and crack deflection of copper fibers in composites were analyzed by SEM morphology. Addition of appropriate amount of graphite to AASC can effectively reduce the wear rate and improve the stability of the material friction coefficient. The coefficient of friction also remains stable in the high-speed friction experiments without thermal degradation. Therefore, copper fiber reinforced AASC friction materials prepared by hot-pressing method has good mechanical and friction properties.
2026年02期 v.41;No.190 381-390页 [查看摘要][在线阅读][下载 1304K]
- 李召峰;GAO Weihao;GUO Xingzhang;张健;LIU Xiaolin;
To improve the applicability of red mud in subgrade construction, we studied the effects of four traditional retarders, including borax, sodium hexametaphosphate, sodium gluconate, and sucrose, on the setting time, mechanical properties and soil solidification of red mud-based subgrade engineered cementitious material(RCM). The mechanisms of the retarders on the hydration process of RCM were analyzed by hydration microcalorimeter, XRD, TG, and SEM-EDS. The experimental results show that four retarders have retarding effect on RCM, among which sodium gluconate and sucrose have significant retarding effect and do not have adverse effect on 28 d strength. Borax can slightly delay the setting time, and sodium hexametaphosphate has a better retarding effect, but they both reduce the 28 d strength. Microcosmic analysis shows that the retarders do not change the type of RCM hydration products, but mainly slow down the rate of hydration reaction through the adsorption and complexation or reaction of Ca~(2+) in the slurry. All the results show that the retarder has no weakening effect on the unconfined compressive strength, water stability and CBR properties of the stabilized subgrade soil based on RCM.
2026年02期 v.41;No.190 391-402页 [查看摘要][在线阅读][下载 1420K] - 石贺男;李化建;HUANG Fali;YANG Zhiqiang;DONG Haoliang;
This study aimed to investigate the influence of recycled sand(RS) content and water-binder ratio on the long term performance of recycled sand concrete(RSC). A 220 days drying shrinkage and creep test of RSC was conducted, and the microhardness of ITZ were analyzed to explain the differences in performance. The experimental results indicate that, when RS content is 50%, the drying shrinkage and creep strain of RSC is the smallest. This is attributed to the highest microhardness in the ITZ when the RS content is 50%. When the RS content is 100%, the shrinkage and creep strains increase due to the high water absorption of RS, which leads to the evaporation of additional water and the deterioration of the ITZ. As the water-binder ratio increases, the drying shrinkage and creep strain of RSC with different RS content increases. According to the EC2 specification and the CEB-FIP specification, the drying shrinkage and creep prediction models for RSC have been established.
2026年02期 v.41;No.190 403-413页 [查看摘要][在线阅读][下载 2221K] - 刘洋;LI Jiyun;张林涛;ZHANG Wei;WANG Yuangui;
Curing temperature significantly affects the pozzolanic reaction kinetics of phosphorous slag(PS), thereby governing the early-age(7 d) hydration behavior of PS composite binders at 20, 30, and 60 ℃. The Krstulovic-Dabic kinetic model was applied to identify three characteristic processes: nucleation and growth(NG), phase boundary interaction(I), and diffusion(D). Control mixtures containing inert quartz powder with comparable particle size distributions were prepared for comparison. Pore characteristics of hardened PS pastes at different temperatures were analyzed via mercury intrusion porosimetry, while hydration products were characterized using X-ray diffraction(XRD) and thermogravimetric analysis(TG-DTG). The experimental results indicate that the retarding effect of PS on early cement hydration outweighs its accelerating effect, attributed to the combined influence of nucleation and dilution, with retardation decreasing as temperature increases. PS exhibits early reactivity and continuously consumes calcium hydroxide through the pozzolanic reaction, as evidenced by stable phase assemblages accompanied by reduced CH content in XRD and TG-DTG analyses. At 20 ℃, increasing PS content maintains the NG→I→D mechanism but slows reaction rates across all stages. Elevated temperatures significantly accelerate the NG process, shifting the dominant mechanism from NG toward D. Simultaneously, enhanced PS reactivity contributes to a refined pore structure and improved compressive strength.
2026年02期 v.41;No.190 414-426页 [查看摘要][在线阅读][下载 1485K] - 王海良;ZHANG Yan;荣辉;LIU Dee;ZHANG Yiming;DING Longhui;GAI Qingshan;QIU Peng;HU Liping;XU Feng;AI Fengquan;
We mixed Bacillus subtilis and brewing yeast to prepare composite microbial self-healing materials,and studied the self-healing effect of composite microorganisms in mortar cracks of different widths and cracking ages.The experimental results show that the performance and self-healing effect of composite micro-organisms are significantly better than those of single microorganisms.For cracks with widths of 0.2-0.4 mm,the repair effect of the composite microorganisms at 28 days is 42.7%and 71.2%higher than that of pure Bacillus and pure yeast,respectively.The repairing rate of the area with the widths of the cracks of 0.2-0.4,0.4-0.6,and 0.6-0.8 mm are 100%,77.3%,and 53.4%,respectively.The area repair rates corresponding to cracking ages of 56,90,and 180 days are 73.3%,55.4%,and 30.8%,respectively.
2026年02期 v.41;No.190 427-434页 [查看摘要][在线阅读][下载 1371K] - 黄晚雨;刘荣进;LU Fuhua;JING Daiyan;ZHENG Yixing;ZHANG Liyang;
To address the inefficient utilization of electrolytic manganese residue(EMR) caused by its high inert content, this study developed a multifunctional solid waste cementitious material by replacing 50-60% of ordinary Portland cement(PO 42.5) with wet-ground electrolytic manganese residue(WEMR), wetground granulated blast-furnace slag(WGBFS), and carbide slag(CS). The mechanical properties, hydration characteristics, microstructure, and carbon emissions of the material were systematically investigated with varying WEMR dosages. The experimental results demonstrates that the wet-grinding process significantly refines the particle size and enhances the reactivity of both EMR and GBFS. As the WEMR dosage increases, the 28-day compressive strength initially rise and then declines. Optimal mechanical performance was achieved with 24% WEMR and 6% CS, yielding a 28-day compressive strength of 48.2 MPa. Advanced analytical techniques, including XRD, TG-DTG, SEM, and MIP, were employed to examine the hydration products. The findings reveal that the wet-grinding-alkali-sulfur synergistic activation system in the multi-solid waste cementitious material effectively utilize EMR to generate abundant hydration products such as AFt and C-(A)-S-H. Additionally, the fine particles of WEMR fill the pores in the mortar, further enhancing compressive strength. The cost and carbon emissions of this multifunctional system are only 65.97% and 46.9% of those of PO 42.5, respectively. This study provides a feasible approach for the efficient utilization of EMR, contributing to sustainable construction practices.
2026年02期 v.41;No.190 435-447页 [查看摘要][在线阅读][下载 1438K] - 孙博;张美香;YANG Xiaolin;DING Yahong;WANG Xingguo;ZHANG Xianggang;
To explore mix proportion design of RAC with aggregates tightly packed, the dry and wet packing density of recycled coarse aggregates mixture system and recycled coarse and fine aggregates were tested, then the influence of replacement rate and particle size ratio on the packing density of particle system was explored, the packing density prediction model of recycled coarse aggregates based on particle morphology was constructed, and the mix proportion optimization for recycled aggregate concrete with dry-wet packing model was carried out. The experimental results show that, with the increasing of recycled aggregate replacement rate or fine-grained volume ratio, the dry packing density of recycled coarse aggregates decreases gradually. With the increasing of replacement rate, the particle gradation can be optimized by increasing coarsegrained volume ratio. There is a significant effect for particle morphology parameter K and the particle size ratio on the packing density of the binary mixed system, and the packing density prediction model of recycled coarse aggregates based on particle morphology was constructed. The maximum increase in compressive strength and tensile strength of RAC with mix proportion optimized by the dry-wet packing model are 12.94% and 11.09%, and the cementitious materials is reduced by 21.83%, then the superiority of the mix proportion optimization of RAC with the dry-wet close packing model is confirmed. The results of this paper can provide a theoretical basis for the mix proportion design of RAC.
2026年02期 v.41;No.190 448-462页 [查看摘要][在线阅读][下载 1309K] - 冯阳;ZHU Yakun;AI Fengquan;荣辉;JIN Kan;WU Honggang;CHEN Xiaoxaio;DENG Kun;
Sporosarcina pasteurii was employed as the strain, with an in-situ magnetization construction, to obtain magnetic microorganisms and oriented self-healing mortar specimens based on them. The magnetic field was used to achieve the directional migration of magnetic microorganisms during the oriented selfhealing of mortar cracks, improving the rate of self-healing of cracks. The experimental results demonstrate that the magnetic microorganisms are composed of Fe_3O_4 nanosheets attached to the surface of Sporosarcina pasteurii, whose mineralization products are comprised of vaterite primarily. Compared with the pure microbial group, the magnetic microbial group exhibits a faster repair rate, shortening the repair time required to achieve an area repair efficiency of over 90% from 28 days to 14 days, thereby doubling the repair rate. Meanwhile, the area repair efficiency of the magnetic microbial group at 7, 14, and 28 days are increased by 50.3%, 11.2%, and 4.6%, respectively, compared to the pure microbial group, which are due to the magnetic microorganisms' superior directional migration and mineralization ability, exceeding that of the ordinary microorganisms.
2026年02期 v.41;No.190 463-471页 [查看摘要][在线阅读][下载 1112K] - 朱乃姝;JIN Fengnian;OU Zhongwen;DAI Yinsuo;LIU Yong;ZHANG Zhi;MA Linjian;HE Huguang;张寒松;
We employed machine learning approaches and visualization interpretation methods to explore the influencing factors of the compressive strength of sea sand concrete to attain a better understanding of the inherent laws of concrete mix design. Four models, including random forest, Cat Boost, XGBoost, and deep neural network, were trained. The experimental results demonstrate that the XGBoost model performs the best in predicting the strength of sea sand concrete. Its R~2 value reached 0.9999, and evaluation indexes such as MAPE, RMSE, MAE, and MSE are superior to those of other models. The principal component analysis(PCA) was conducted to visually analyze the structure and distribution of the original feature data, and Pearson correlation coefficient analysis and Shapley additive explanation(SHAP) were utilized to explore the impact of input characteristics on the strength of sea sand concrete. SHAP analysis is more conducive to revealing the nonlinear effects of various characteristics on the model prediction results, especially that particle size of stone has significant impacts on the strength of sea sand concrete. In addition, experimental verification was carried out to confirm the accuracy of the optimized training model. These findings offer some insights for the future design and application of sea sand in high-performance marine and coastal infrastructure.
2026年02期 v.41;No.190 472-482页 [查看摘要][在线阅读][下载 1332K] - 李宝兰;郑卫新;李一凰;
The influence mechanism of MgO particle fineness on the properties of MOC was comprehensively explored through means of grinding, sieving, hydration and apparent density testing, in conjunction with characterization methods such as setting time, stability, compressive strength, and microscopic morphology. The findings reveal that MOC demonstrates excellent stability and mechanical properties when the particle fineness of MgO is less than 75 μm. When the MgO particle fineness exceeds 75 μm, MOC exhibits superior fluidity and maneuverability. When 0.75 μm MgO is employed as the raw material to prepare MOC, a water-cement ratio of 0.6 proves more favorable. These results can furnish a theoretical foundation for the preparation and application of MOC.
2026年02期 v.41;No.190 483-490页 [查看摘要][在线阅读][下载 1108K]
- 段兴旺;JIANG Dong;TAN Yunyun;CHE Xin;ZHAO Peifeng;LIU Jiachen;
To investigate the effects of extrusion temperature on the microstructure and mechanical properties of WE43 magnesium alloy, extrusion experiments were conducted under 330, 380, 430, and 450 ℃, and the extrusion ratio was 16. The experimental results indicate that, at a low temperature of 330 ℃, the alloy precipitates a large amount of second phases rich in Zr elements. Moreover, the texture strength and kernel average misorientation value are the highest, with values of 27.77 and 0.71, respectively. The increase in extrusion temperature leads to a gradual decrease in texture strength and kernel average misorientation value. The strength of the alloy is the highest at an extrusion temperature of 330 ℃. Its tensile yield stress is 254.7 MPa and ultimate tensile strength is 302.7 MPa, respectively. As the extrusion temperature increases, the strength of the alloy gradually decreases. At an extrusion temperature of 450 ℃, the tensile yield stress is 181.3 MPa and ultimate tensile strength is 265.7 MPa, respectively. The elongation first increases and then decreases, with an elongation of 20.9% at an extrusion temperature of 330 ℃. At an extrusion temperature of 430 ℃, the elongation reaches its maximum value, which is 23.6%. At an extrusion temperature of 450 ℃, the elongation reaches its lowest value, which is 16.4%.
2026年02期 v.41;No.190 491-498页 [查看摘要][在线阅读][下载 1246K] - 马欢;CUI Yaqi;SHAO Yang;杨莉;PANG Huifang;ZHANG Jin;管仁国;
W-CoFeNi WHAs(tungsten heavy alloys) were fabricated by powder metallurgy with sintering temperatures ranging from 1 480 to 1 560 ℃. The influence of sintering temperatures on microstructure evolutions and mechanical properties of W-CoFeNi WHAs was investigated. The experimental results show that near-spherical W grains are distributed in CoFeNi ternary multi-principal-elements alloy(MPEA) with the formation of W-rich μ phase in all W-CoFeNi WHAs. The volume fractions of μ phase and average W grain size increase with sintering temperatures changing from 1 480 to 1 560 ℃. The activation energy for W grain growth is significantly higher than that of traditional W-Ni-Fe and W-Ni-Co WHAs, which indicates grain coarsening behavior in CoFeNi MPEA became more difficult compared to the conventional binder alloys. W-CoFeNi sintered at 1 480 ℃ exhibits the highest yield strength of 698 MPa among all WHAs due to finer W grain size. The compressive strength and fracture strain of W-CoFeNi reduce when sintering temperatures rise from 1 480 to 1 560 ℃.
2026年02期 v.41;No.190 499-505页 [查看摘要][在线阅读][下载 1144K] - 王莹楠;孟晓凯;郭俊宏;
Mg-18Zn-3Y alloy containing an icosahedral quasicrystal phase(I-phase) was prepared using the ordinary solidification method. After solid solution treatment at 320 and 420 ℃, indentation creep tests were conducted for the Mg matrix and the I-phase in different solid solution states in Mg-18Zn-3Y alloy using the indentation technique with a Berkovich indenter. The quasicrystalline phases with stripy and skeletal structures were identified through the microscopic observation and energy spectrum analysis. The results indicate that the elastic modulus, microhardness, and creep stress index of the I-phase in the alloy initially increase and then decrease with increasing solution temperature. The elastic modulus and microhardness of the α-Mg alloy are the highest in the as-cast state, and the creep stress index increases with increasing solution temperature. This study provides a practical basis for microstructure measurement of quasicrystalline creep.
2026年02期 v.41;No.190 506-511页 [查看摘要][在线阅读][下载 1422K] - 韩亚锋;HAO Bohao;屈淑维;WANG Hongfu;LI Ruiqin;YAO Wei;
A deep-undercooling rapid-solidification technique combining cyclic superheating and molten glass purification was employed to successfully prepare Cu60Ni40 and Cu65Ni35 alloys at various undercooling levels. Furthermore, through precise compositional regulation by adjusting the Cu content and introducing Co, the Cu60Ni35Co5 alloy was obtained. The morphological evolution of the solidification front and the variation in solidification rate with undercooling were systematically investigated. By combining metallographic analysis, the BCT model, electron backscatter diffraction(EBSD), and transmission electron microscopy(TEM), the microstructural evolution and grain refinement mechanisms of the undercooled alloys were revealed. This work aims to establish the intrinsic relationship among undercooling, solidification behavior, and microstructure, thereby provides both experimental and theoretical foundations for a deeper understanding of the deep undercooling solidification mechanism and microstructural control.
2026年02期 v.41;No.190 512-522页 [查看摘要][在线阅读][下载 6439K]
- 陈浩;ZHENG Wenhua;季节;DONG Zhilei;YU Yening;WANG Zihao;CHEN Meng;ZHOU Wenjuan;
A comprehensive full-sieve-hole grading correction method was used to adjust aggregate gradings. The fatigue properties of recycled concrete aggregate(RCA) asphalt mixtures were investigated using an improved indirect tensile fatigue test under temperature-humidity coupling based on 20-year meteorological data of Beijing, and the degeneration mechanism was further explored by scanning electron microscopy and energy-dispersive spectroscopy. The experimental results indicate that replacing 5-20 mm coarse limestone aggregate(LA) with RCA at a 50% substitution volume can mitigate the impact of RCA variations on the asphalt mixture proportioning design. All RCA asphalt mixtures have lower initial fatigue properties than the LA asphalt mixture. However, under temperature-humidity coupling, the long-term fatigue property of an RCA asphalt mixture with a low proportion of recycled brick exceeds that of the LA asphalt mixture, and the fatigue life decline rate of the RCA asphalt mixture during 10-year service decreases by approximately 25%. This is due to the penetration of the asphalt mortar into the RCA through the pores and cracks on the RCA surface. It forms an interfacial transition zone composed of asphalt mortar and cement mortar and further reduces the mixture damage caused by the water and freeze-thaw conditions.
2026年02期 v.41;No.190 523-536页 [查看摘要][在线阅读][下载 1371K] - 贾雷宇;吴俊佶;YU Zixin;CHEN Yuan;XU Yao;WANG Jie;HU Zhen;HU Chuanqun;DING Dachuan;YANG Bin;HU Tao;GONG Xinghou;王娟;ALBINA Jan-Michael;吴崇刚;HARA Masanori;
When a ceramic ionic-crystal nanocluster is group-substituted with polymer chain segments to form an ionomeric aggregate, is the ordered structure maintained within the sterically hindered nanocluster? We observed, for Na-salt sulfonated polystyrene ionomer, the electron-diffraction lattice fringes of the nanoclusters, which proved their internal crystalline ordering driven by electrostatic attractions overcoming steric hindrance. Kinetically, the nanoclusters' enhanced melting endotherm upon aging indicate their quasi-, slow-ordering character. Extended tight binding molecular dynamics simulations provide an insight into the mechanism underlying the ionic-group aggregation during nanoclustering. We hence proposed an uncommon state of order, polymer-bound ceramic quasicrystal, supplementary to the order phenomena in crystalline ceramics.
2026年02期 v.41;No.190 537-546页 [查看摘要][在线阅读][下载 1351K] - 王敏帅;CAI Xiaomei;ZHENG Kai;
To evaluate their performance, we constructed organic solar cells using PTB7/Y6 and PTB7-b-PNDI active layers, which were deposited on PET substrates coated with PEDOT: PSS. The ternary solar cells demonstrated an excellent power conversion efficiency after being stretched by 38%. The stretchable organic solar cells were spin-coated on the flexible substrate. The electrodes were formed via liquid metal dropcoating. Solar cell devices based on PET/PH1000/PEDOT: PSS and PTB7:Y6: 5% BCP active layer materials show better stretchability than the normal solar cells. The PTB7: Y6: 5% BCP-based stretchable organic solar cell achieves a high PCE of 12.3%, and a PCE of 7.8% after stretching. Incorporating block copolymer additives improves the mechanical properties of organic solar cells, thereby enabling superior stretchability.
2026年02期 v.41;No.190 547-552页 [查看摘要][在线阅读][下载 1132K] - 张立卿;LI Xiyou;WEI Luofei;XIONG Jingang;XIONG Xinfu;王云洋;
Utilization of ceramic wastes to fabricate concrete can not only effectively dispose the wastes, but also reduce the energy and source consumptions. Therefore, we fabricated a green ultra high performance concrete using ceramic waste powder(CWP) to replace 55% of cement, and ceramic waste aggregate(CWA) to replace 100% natural quartz sand. However, high content of ceramic wastes will harm the concrete performance including workability and mechanical properties. Therefore, a low-cost and low carbon nano-calcium carbonate(NC) was introduced to compensate for the defects caused by large amounts of CWP and CWA to workability and mechanical behavior. The experimental results show that the workability of ultra high performance concrete with large amounts of CWP and CWA(UHPCLCC) increases by 28.57% with NC content of 5%. Moreover, the flexural strengths, fracture energy, compressive strengths, and compressive toughness of UHPCLCC increase up to 29.6%, 56.5%, 20.4%, and 37.6%, respectively, which is caused by the nano-core effect of NC.
2026年02期 v.41;No.190 553-562页 [查看摘要][在线阅读][下载 1621K]
- 夏雨龙;WU Junen;王真珍;ZHANG Luzhi;ZHANG Ruizhi;JIANG Yuda;ZHANG Jian;LUO Guoqiang;SHEN Qiang;王友法;ZHOU Xiaozhuang;
We proposed a strategy using high-concentration tannic acid(TA) solutions to form robust and dense supramolecular networks in hydrogels, driven by the high osmotic pressure of the TA solution. The resulting hydrogels are both transparent and tough, with highly compacted networks. The hydrogels exhibit an ultimate tensile strength of approximately 4.55 MPa and a toughness of 160 MJ/m~3. Additionally, the hydrogels adhere to a wide range of substrates, including metals, ceramics, glass, and even Teflon, with an adhesion strength of up to 42 kPa on Teflon plates. Given the biocompatibility and biodegradability of both PVA and TA, along with the hydrogels' toughness, transparency, and adhesiveness, we anticipated broad applications in the biomedical field, such as in articular cartilage restoration, electronic skin, and wound dressings. Additionally, these hydrogels hold significant potential for applications in wearable technology and optoelectronic devices.
2026年02期 v.41;No.190 563-570页 [查看摘要][在线阅读][下载 1143K] - 叶力源;李宾斌;苏柱程;
To enhance the mechanical reliability of dental prostheses under long-term service conditions, this study aimed to evaluate the fracture behavior and energy dissipation characteristics of three commonly used prosthetic materials, namely, zirconia ceramics(ZrO_2), cobalt-chromium alloy(Co-Cr), and titanium-zirconium alloy(Ti-13Zr), under various crack configurations. A three-dimensional finite element model of a single-crown prosthesis incorporating predefined cracks was established, and both axial and oblique multidirectional loads were applied. Using LS-DYNA software, the deformation patterns, principal stress distribution, and energy release characteristics during crack propagation were systematically analyzed. The experimental results indicate that Ti-13Zr alloy exhibited the highest crack resistance, making it particularly suitable for patients with insufficient bone volume or limited implant space. Co-Cr alloy demonstrated favorable structural stability and mechanical performance under high-load conditions. In contrast, due to its inherent brittleness, ZrO_2 was more prone to rapid fracture propagation in long-span or high-stress scenarios, although it remains a preferred option for anterior esthetic zones and patients with metal sensitivities. Furthermore, the simulation outcomes were theoretically validated using Griffith's energy-based fracture criterion, reinforcing the accuracy of failure predictions based on principal stress analysis. This study elucidates the differences in clinical applicability among prosthetic materials and reveals their distinct fracture mechanisms, thereby providing a theoretical foundation for optimizing material selection and structural design. The findings contribute to improving the long-term safety and functional stability of implant-supported dental restorations.
2026年02期 v.41;No.190 571-584页 [查看摘要][在线阅读][下载 1353K] - 黄彬;沈振;FEI Xiaoqi;梁俊辉;HOU Jiahui;KONG Jianyang;CHEN Zhao;CHEN Guolong;YAO Xin;CHEN Da;
We employed oxygen plasma treatment to activate the PTFE surface and introduce oxygencontaining polar groups(-OH, C-O, C=O), thereby enhancing surface energy and interfacial reactivity. We subsequently composited the modified PTFE(PTFE-O) with graphene oxide(GO), enabling tight interactions between the two phases through hydrogen bonding and van der Waals forces. Comprehensive characterizations, including XPS, FTIR, SEM, and contact angle analysis, confirmed the successful surface modification and uniform dispersion of GO. The optimized PTFE-O/GO composite exhibits a low resistivity of 2.41×10~3 Ω·cm under a compression pressure of 2 MPa, demonstrating markedly improved conductivity and antistatic performance. These findings provide an effective route for constructing conductive PTFE-based composites and offer new insights into interface-engineered antistatic polymer materials.
2026年02期 v.41;No.190 585-592页 [查看摘要][在线阅读][下载 1353K] 下载本期数据