Pub Date : 2026-05-01DOI: 10.1016/j.jmrt.2026.06.021
Enci Niu, Xiong Wu, Senwei Wang, Huabing Lu, Jia She
Magnesium alloys have attracted increasing interest as biodegradable implant materials. However, their excessively rapid corrosion in physiological environments severely limits clinical applications. In this work, an rGO/Zn composite coating was successfully constructed on a magnesium alloy surface through a multi-step process involving electrophoretic deposition of GO, thermal reduction, and subsequent Zn electrodeposition. Reduced graphene oxide was introduced as an intermediate layer to improve surface conductivity and enable uniform Zn deposition, addressing the difficulty of directly depositing Zn on magnesium substrates. The effects of Zn 2+ concentration and deposition time on the coating microstructure, adhesion, and corrosion resistance were systematically investigated. The results demonstrate that the rGO interlayer significantly enhances the uniformity and compactness of the Zn coating. The rGO/Zn composite coatings effectively suppress hydrogen evolution, mitigate solution alkalization, and markedly improve the electrochemical stability of magnesium alloys in simulated body fluid. Among all samples, the rGO/Zn-0.1/20 coating exhibits the best overall corrosion resistance, with the corrosion rate reduced to 0.28 mm y −1 . XRD analysis after immersion reveals that the formation of stable corrosion products, including ZnO and Zn 5 (OH) 8 Cl 2 ·H 2 O, plays a critical role in enhancing the long-term protective performance of the composite coating.
镁合金作为一种生物可降解的植入材料越来越受到人们的关注。然而，它们在生理环境中腐蚀过快，严重限制了临床应用。在这项工作中，通过电泳沉积氧化石墨烯、热还原和随后的锌电沉积等多步骤，成功地在镁合金表面构建了氧化石墨烯/锌复合涂层。还原氧化石墨烯作为中间层被引入，以提高表面导电性并实现均匀的锌沉积，解决了直接在镁衬底上沉积锌的困难。系统研究了zn2 +浓度和沉积时间对镀层组织、附着力和耐蚀性的影响。结果表明，氧化石墨烯中间层显著提高了镀层的均匀性和致密性。rGO/Zn复合涂层能有效抑制析氢，减缓溶液碱化，显著提高镁合金在模拟体液中的电化学稳定性。在所有样品中，rGO/Zn-0.1/20涂层的整体耐蚀性最好，腐蚀速率降至0.28 mm y−1。浸渍后的XRD分析表明，ZnO和zn5 (OH) 8cl 2·h2o等稳定腐蚀产物的形成对提高复合涂层的长期防护性能起着至关重要的作用。
{"title":"Conductive rGO interlayer enabling uniform Zn electrodeposition and enhanced corrosion resistance of biodegradable magnesium alloys","authors":"Enci Niu, Xiong Wu, Senwei Wang, Huabing Lu, Jia She","doi":"10.1016/j.jmrt.2026.06.021","DOIUrl":"https://doi.org/10.1016/j.jmrt.2026.06.021","url":null,"abstract":"Magnesium alloys have attracted increasing interest as biodegradable implant materials. However, their excessively rapid corrosion in physiological environments severely limits clinical applications. In this work, an rGO/Zn composite coating was successfully constructed on a magnesium alloy surface through a multi-step process involving electrophoretic deposition of GO, thermal reduction, and subsequent Zn electrodeposition. Reduced graphene oxide was introduced as an intermediate layer to improve surface conductivity and enable uniform Zn deposition, addressing the difficulty of directly depositing Zn on magnesium substrates. The effects of Zn 2+ concentration and deposition time on the coating microstructure, adhesion, and corrosion resistance were systematically investigated. The results demonstrate that the rGO interlayer significantly enhances the uniformity and compactness of the Zn coating. The rGO/Zn composite coatings effectively suppress hydrogen evolution, mitigate solution alkalization, and markedly improve the electrochemical stability of magnesium alloys in simulated body fluid. Among all samples, the rGO/Zn-0.1/20 coating exhibits the best overall corrosion resistance, with the corrosion rate reduced to 0.28 mm y −1 . XRD analysis after immersion reveals that the formation of stable corrosion products, including ZnO and Zn 5 (OH) 8 Cl 2 ·H 2 O, plays a critical role in enhancing the long-term protective performance of the composite coating.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"42 1","pages":"11998-12009"},"PeriodicalIF":0.0,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148305683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gel casting faces challenges like low strength, non-uniformity and long cycles in making large fused silica parts. To address these issues, this study addresses challenges by introducing a composite reinforcement system of silica fibers and polyvinyl alcohol (PVA). The system enhances the green body strength, shortens the processing time, and improves the axial uniformity of the material through multi-scale synergistic effects. Specifically, PVA enhances particle connectivity and green body stiffness through chemical bonding, while silica fibers form a 3D network for physical toughening. This multi-scale interaction increases green body flexural strength to 1254.6 kPa, 2.8 times that of the unreinforced system. Silica fibers also create micro-channels that accelerate moisture diffusion, shortening drying time. Fibers anchor with PVA to construct a 3D network that blocks large-particle sedimentation, homogenizing nanoparticle distribution. These effects collectively reduce axial variations in specific surface area and porosity, enabling uniform composition and density from slurry to sintered body. After sintering optimization (1350°C, 30 min), excellent fiber-nanoparticle integration is achieved, producing a fused silica component with a 4:1 aspect ratio, high axial density uniformity, and over 90% optical transmittance. A decimeter-scale fused silica compound eye lens with precise imaging capability was successfully fabricated, demonstrating the system’s practical potential.
{"title":"Multi-scale synergistic reinforcement and performance control of PVA/fiber binary system in preparation of fused silica via gel method","authors":"Haikuan Chen, Xiaoyan Sun, Zhouwei He, Youwang Hu Youwang Hu, Ji’an Duan","doi":"10.1016/j.jmrt.2026.01.176","DOIUrl":"https://doi.org/10.1016/j.jmrt.2026.01.176","url":null,"abstract":"Gel casting faces challenges like low strength, non-uniformity and long cycles in making large fused silica parts. To address these issues, this study addresses challenges by introducing a composite reinforcement system of silica fibers and polyvinyl alcohol (PVA). The system enhances the green body strength, shortens the processing time, and improves the axial uniformity of the material through multi-scale synergistic effects. Specifically, PVA enhances particle connectivity and green body stiffness through chemical bonding, while silica fibers form a 3D network for physical toughening. This multi-scale interaction increases green body flexural strength to 1254.6 kPa, 2.8 times that of the unreinforced system. Silica fibers also create micro-channels that accelerate moisture diffusion, shortening drying time. Fibers anchor with PVA to construct a 3D network that blocks large-particle sedimentation, homogenizing nanoparticle distribution. These effects collectively reduce axial variations in specific surface area and porosity, enabling uniform composition and density from slurry to sintered body. After sintering optimization (1350°C, 30 min), excellent fiber-nanoparticle integration is achieved, producing a fused silica component with a 4:1 aspect ratio, high axial density uniformity, and over 90% optical transmittance. A decimeter-scale fused silica compound eye lens with precise imaging capability was successfully fabricated, demonstrating the system’s practical potential.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"41 1","pages":"2870-2882"},"PeriodicalIF":0.0,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147893936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-14DOI: 10.1016/j.jmrt.2026.01.101
Shuaiqi Chang, Kai Yang, Chang Zhou, Shuai Pang, Guoqing Xin
{"title":"Programmable 3D printing orientation-induced toughening for biomimetic hierarchical ceramic composites","authors":"Shuaiqi Chang, Kai Yang, Chang Zhou, Shuai Pang, Guoqing Xin","doi":"10.1016/j.jmrt.2026.01.101","DOIUrl":"https://doi.org/10.1016/j.jmrt.2026.01.101","url":null,"abstract":"","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"41 1","pages":"1786-1795"},"PeriodicalIF":0.0,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147887525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In response to the challenges of excessively rapid degradation and inadequate antibacterial properties in medical magnesium alloys, this study investigates the regulatory effect of ion implantation technology on the surface characteristics of ZM21 magnesium alloy, with particular emphasis on evaluating the influence of single Ti ion implantation (ZM21-Ti) and Ti/Ag co-implantation (ZM21-Ti/Ag) on microstructure, corrosion behavior, in vitro degradation, biocompatibility, and antibacterial performance. XRD and XPS analyses confirmed the successful incorporation of Ti and Ag elements into the alloy surface, where they exist predominantly as TiO 2 , metallic Ag, and Ag 2 O. Electrochemical tests and in vitro degradation experiments revealed that Ti ion implantation significantly improves corrosion resistance, achieving the lowest corrosion current density (I corr ) of 3.05 μA·cm -2 and the slowest degradation rate. In contrast, Ti/Ag co-implanted samples exhibited accelerated corrosion due to galvanic coupling, resulting in a higher I corr of 13.96 μA·cm -2 . Cell culture assays demonstrated that ZM21-Ti possesses favorable cytocompatibility and effectively promotes the expression of osteogenic genes and mineralized nodule formation. However, ZM21-Ti/Ag showed notable cytotoxicity under high-concentration extract conditions. With respect to antibacterial activity, ZM21-Ti/Ag displayed superior antibacterial efficacy, attributed to its faster degradation and enhanced release of antimicrobial Ag + ions. Meanwhile, ZM21-Ti achieved a balanced performance between moderate antibacterial capability (73.67% inhibition rate) and strong osteogenic potential. These findings suggest that Ti ion implantation is an effective surface modification approach for improving both corrosion resistance and biocompatibility of ZM21 magnesium alloy without compromising its antibacterial functionality.
{"title":"Surface modification of biodegradable ZM21 magnesium alloy by Ti and Ag ion implantation for orthopedic implants","authors":"Chang Chen, Ruimin Tang, Yifeng Guo, Xiaoli Lei, Qian Min, Yujiao Lu, Yilong Dai","doi":"10.1016/j.jmrt.2026.01.005","DOIUrl":"https://doi.org/10.1016/j.jmrt.2026.01.005","url":null,"abstract":"In response to the challenges of excessively rapid degradation and inadequate antibacterial properties in medical magnesium alloys, this study investigates the regulatory effect of ion implantation technology on the surface characteristics of ZM21 magnesium alloy, with particular emphasis on evaluating the influence of single Ti ion implantation (ZM21-Ti) and Ti/Ag co-implantation (ZM21-Ti/Ag) on microstructure, corrosion behavior, in vitro degradation, biocompatibility, and antibacterial performance. XRD and XPS analyses confirmed the successful incorporation of Ti and Ag elements into the alloy surface, where they exist predominantly as TiO 2 , metallic Ag, and Ag 2 O. Electrochemical tests and in vitro degradation experiments revealed that Ti ion implantation significantly improves corrosion resistance, achieving the lowest corrosion current density (I corr ) of 3.05 μA·cm -2 and the slowest degradation rate. In contrast, Ti/Ag co-implanted samples exhibited accelerated corrosion due to galvanic coupling, resulting in a higher I corr of 13.96 μA·cm -2 . Cell culture assays demonstrated that ZM21-Ti possesses favorable cytocompatibility and effectively promotes the expression of osteogenic genes and mineralized nodule formation. However, ZM21-Ti/Ag showed notable cytotoxicity under high-concentration extract conditions. With respect to antibacterial activity, ZM21-Ti/Ag displayed superior antibacterial efficacy, attributed to its faster degradation and enhanced release of antimicrobial Ag + ions. Meanwhile, ZM21-Ti achieved a balanced performance between moderate antibacterial capability (73.67% inhibition rate) and strong osteogenic potential. These findings suggest that Ti ion implantation is an effective surface modification approach for improving both corrosion resistance and biocompatibility of ZM21 magnesium alloy without compromising its antibacterial functionality.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"2532-2542"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147896314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, the high-entropy stability is predicted based on density functional theory (DFT) firstly. Then, the (WZrNbTaM)C (M=Cr, Ni, Ti) high-entropy carbide powders are synthesized by carbothermal reduction reaction. The synthesized high-entropy carbide powders are densified with addition of Co and Ni at a lower temperature. The phase analysis and microstructure observation, followed by mechanical property test, including Vickers hardness and fracture toughness of the high-entropy carbides are investigated. Finally, electrochemical corrosion behavior test of the samples is conducted in NaCl solution. It is found that a small amount of metal (2.5 wt.% Co and 2.5 wt.% Ni) can reduce the sintering temperature of high-entropy carbides, and the relative density can reach more than 96% at 1600 °C. The metal is uniformly dispersed among the high-entropy ceramic particles, facilitating liquid-phase mass transfer and pore elimination. (WZrNbTaNi)C-Co-Ni has the best comprehensive mechanical properties, with hardness and fracture toughness reaching 19.7 GPa and 6.6 MPa·m 1/2 , respectively. In 3.5 wt.% NaCl solution, oxides have formed on the surface of the samples after electrochemical corrosion test, and (WZrNbTaCr)C-Co-Ni shows excellent corrosion resistance.
{"title":"Microstructure, mechanical properties and corrosion behavior of high-entropy (WZrNbTaM)C (M= Cr, Ni, Ti) carbides","authors":"Jiatai Zhang, Weili Wang, Zhixuan Zhang, Sijie Wei, Qiang Zhang, Zongyao Zhang, Weibin Zhang","doi":"10.1016/j.jmrt.2025.12.309","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.309","url":null,"abstract":"In this work, the high-entropy stability is predicted based on density functional theory (DFT) firstly. Then, the (WZrNbTaM)C (M=Cr, Ni, Ti) high-entropy carbide powders are synthesized by carbothermal reduction reaction. The synthesized high-entropy carbide powders are densified with addition of Co and Ni at a lower temperature. The phase analysis and microstructure observation, followed by mechanical property test, including Vickers hardness and fracture toughness of the high-entropy carbides are investigated. Finally, electrochemical corrosion behavior test of the samples is conducted in NaCl solution. It is found that a small amount of metal (2.5 wt.% Co and 2.5 wt.% Ni) can reduce the sintering temperature of high-entropy carbides, and the relative density can reach more than 96% at 1600 °C. The metal is uniformly dispersed among the high-entropy ceramic particles, facilitating liquid-phase mass transfer and pore elimination. (WZrNbTaNi)C-Co-Ni has the best comprehensive mechanical properties, with hardness and fracture toughness reaching 19.7 GPa and 6.6 MPa·m 1/2 , respectively. In 3.5 wt.% NaCl solution, oxides have formed on the surface of the samples after electrochemical corrosion test, and (WZrNbTaCr)C-Co-Ni shows excellent corrosion resistance.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"2660-2671"},"PeriodicalIF":0.0,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-31DOI: 10.1016/j.jmrt.2025.12.253
Hao Zhang, Linwei Li, Shicheng Wei, Hongjie Luo, Xinyang Wang, Yujiang Wang, Lei Guo, Bo WANG, Yi Liang
In this study, porous titanium and porous TC4 (Ti–6Al–4V) titanium alloy with a porosity of 55 ± 2 % were fabricated using the magnesium particle space holder-distillation-sintering process. Through performance tests and microstructural characterization, the differences and underlying mechanisms of their quasi-static and impact compression properties were investigated. Under quasi-static compression, the energy absorption density (65.01 ± 11.70 MJ/m 3 ) and energy absorption efficiency (75.58 ± 2.95 %) of porous TC4 were significantly superior to those of porous titanium (28.77 ± 3.16 MJ/m 3 and 59.98 ± 5.05 %, respectively), corresponding to 2.26 times higher in energy absorption density and 1.26 times higher in energy absorption efficiency. Macroscopically, porous TC4 exhibited a prolonged stress plateau owing to sufficient deformation and slow crack propagation. Microscopically, Al and V pinned dislocations, inhibited dynamic recovery, and promoted the formation of stable low-angle grain boundary (LAGB) networks, thereby avoiding strain localization. Under impact compression tested via SHPB over strain rates of 1282–4290 s −1 , porous TC4 demonstrated a more pronounced strain-rate strengthening effect. This is attributed to the elevation of the Peierls–Nabarro stress and the introduction of the solute drag effect by Al and V, which rendered dislocation motion highly dependent on strain rate. The study elucidates the regulatory role of alloying elements, quantifies the contribution of micro-factors to strain-rate strengthening, identifies Al and V as the core elements for performance enhancement, and provides key theoretical and technical foundations for the optimization of porous metallic materials.
{"title":"Study on energy absorption enhancement mechanism of porous TC4 titanium alloy compared with porous titanium under static and impact loads","authors":"Hao Zhang, Linwei Li, Shicheng Wei, Hongjie Luo, Xinyang Wang, Yujiang Wang, Lei Guo, Bo WANG, Yi Liang","doi":"10.1016/j.jmrt.2025.12.253","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.253","url":null,"abstract":"In this study, porous titanium and porous TC4 (Ti–6Al–4V) titanium alloy with a porosity of 55 ± 2 % were fabricated using the magnesium particle space holder-distillation-sintering process. Through performance tests and microstructural characterization, the differences and underlying mechanisms of their quasi-static and impact compression properties were investigated. Under quasi-static compression, the energy absorption density (65.01 ± 11.70 MJ/m 3 ) and energy absorption efficiency (75.58 ± 2.95 %) of porous TC4 were significantly superior to those of porous titanium (28.77 ± 3.16 MJ/m 3 and 59.98 ± 5.05 %, respectively), corresponding to 2.26 times higher in energy absorption density and 1.26 times higher in energy absorption efficiency. Macroscopically, porous TC4 exhibited a prolonged stress plateau owing to sufficient deformation and slow crack propagation. Microscopically, Al and V pinned dislocations, inhibited dynamic recovery, and promoted the formation of stable low-angle grain boundary (LAGB) networks, thereby avoiding strain localization. Under impact compression tested via SHPB over strain rates of 1282–4290 s −1 , porous TC4 demonstrated a more pronounced strain-rate strengthening effect. This is attributed to the elevation of the Peierls–Nabarro stress and the introduction of the solute drag effect by Al and V, which rendered dislocation motion highly dependent on strain rate. The study elucidates the regulatory role of alloying elements, quantifies the contribution of micro-factors to strain-rate strengthening, identifies Al and V as the core elements for performance enhancement, and provides key theoretical and technical foundations for the optimization of porous metallic materials.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"2307-2317"},"PeriodicalIF":0.0,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147892926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Silicon nitride with 5, 10 and 20 wt.% molybdenum addition (Mo-Si/Si 3 N 4 composite) was prepared by spark plasma sintering and its mechanical and tribological properties at RT, 300, 600 and 900 °C were systematically investigated. When the test temperature below 600 °C, the multiple effects of in-situ generated Mo-Si compounds on cracks, including deflection and closure during the initiation stage and deflection and bridging during the crack propagation, effectively improved the fracture toughness of Mo-Si/Si 3 N 4 composite. Furthmore, Mo-Si/Si 3 N 4 composite exhibited excellent tribological properties at elevated temperature, which rely on the substrate protection through the generation of MoO 3 tribofilm. Especially, at 600 °C, the sample with 20 wt.% Mo addition showed only 8.1×10 -6 mm -3 /Nm in wear rate while monolithic Si 3 N 4 showed 1.5×10 -3 mm -3 /Nm in wear rate, resulted in a three-order-of-magnitude decrease in wear.
采用火花等离子烧结法制备了钼添加量为5、10和20 wt.%的氮化硅（Mo-Si/ si3n4复合材料），并对其在室温、300、600和900℃下的力学性能和摩擦学性能进行了系统研究。当试验温度低于600℃时，原位生成的Mo-Si化合物对裂纹的多重作用，包括起裂阶段的挠曲和闭合以及裂纹扩展阶段的挠曲和桥接，有效地提高了Mo-Si/ si3n4复合材料的断裂韧性。此外，Mo-Si/ si3n4复合材料在高温下表现出优异的摩擦学性能，这依赖于通过生成moo3摩擦膜对衬底的保护。特别是，在600℃时，添加20 wt.% Mo的样品的磨损率仅为8.1×10 -6 mm -3 /Nm，而单片Si 3n4的磨损率为1.5×10 -3 mm -3 /Nm，导致磨损率降低了三个数量级。
{"title":"Research on the mechanical and tribological properties of Mo–Si/Si3N4 composite at elevated temperature","authors":"Gaoxi Cui, Ziyue Wang, Tongyang Li, Lujie Wang, Yuan Yu, Huaguo Tang, Zhuhui Qiao","doi":"10.1016/j.jmrt.2025.12.302","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.302","url":null,"abstract":"Silicon nitride with 5, 10 and 20 wt.% molybdenum addition (Mo-Si/Si 3 N 4 composite) was prepared by spark plasma sintering and its mechanical and tribological properties at RT, 300, 600 and 900 °C were systematically investigated. When the test temperature below 600 °C, the multiple effects of in-situ generated Mo-Si compounds on cracks, including deflection and closure during the initiation stage and deflection and bridging during the crack propagation, effectively improved the fracture toughness of Mo-Si/Si 3 N 4 composite. Furthmore, Mo-Si/Si 3 N 4 composite exhibited excellent tribological properties at elevated temperature, which rely on the substrate protection through the generation of MoO 3 tribofilm. Especially, at 600 °C, the sample with 20 wt.% Mo addition showed only 8.1×10 -6 mm -3 /Nm in wear rate while monolithic Si 3 N 4 showed 1.5×10 -3 mm -3 /Nm in wear rate, resulted in a three-order-of-magnitude decrease in wear.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"2466-2478"},"PeriodicalIF":0.0,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147331207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-23DOI: 10.1016/j.jmrt.2025.12.204
Kaiping Hu, Hao Zhang, Shuailing Ma, Min Lian, Xingbin Zhao, Yanping Huang, Tian Cui
{"title":"Synergistic enhancement of thermoelectric performance in p-type polycrystalline SnSe via HPHT processing and CuS doping","authors":"Kaiping Hu, Hao Zhang, Shuailing Ma, Min Lian, Xingbin Zhao, Yanping Huang, Tian Cui","doi":"10.1016/j.jmrt.2025.12.204","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.204","url":null,"abstract":"","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"3223-3232"},"PeriodicalIF":0.0,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study employs a bimodal powder system composed of nanoscale agglomerated spherical particles and micrometer-scale irregular particles to fabricate yttria (Y 2 O 3 ) ceramic cores via Binder Jetting (BJ) technology, aiming to overcome sintering challenges in titanium alloy casting. This study employs an innovative two-step surface modification method for spherical powders: first, coating with 4wt% bis (dioctyl pyrophosphate) vinyl titanate to suppress binder adsorption, followed by activation with 3wt% fatty alcohol polyoxyethylene ether to enhance wettability, ultimately achieving a BJ forming process based on nanopowders. The optimized bimodal mixing ratio (fine powder 24.5%/coarse powder 75.5%) endows the powder bed with exceptional packing density (2.143 g/cm 3 ) and flowability (Hausner ratio=1.41), while the formed green body exhibits excellent bulk density (2.10 ± 0.13 g/cm 3 ) and flexural strength (2.56±0.108 MPa). After sintering at 1700°C, the F24.5C75.5 formulation exhibited accurate anisotropic shrinkage (X-axis: 8.67±0.44%, Y-axis: 9.24±0.46%, Z-axis: 11.64±0.74%), achieving a flexural strength of 23.86±1.2 MPa—a 166% improvement compared to the pure micron-scale formulation—along with a surface roughness of 8.96±0.47 μm, meeting aerospace standard SAE AS71051. Mechanistic analysis revealed that nanoclusters promote interparticle neck formation, while micron-scale particles provided a dimensional anchoring effect, establishing a new paradigm for refractory ceramic additive manufacturing.
{"title":"Surface-engineered bimodal yttria powder system enables high-performance ceramic cores via binder jetting for titanium alloy casting","authors":"Wei Zhao, Xiuyuan Qin, Kunhao Feng, Kaiqi Zou, Hai Nan, Jiaming Wu, Xiwang Qie, Qingsong Wei","doi":"10.1016/j.jmrt.2025.12.163","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.163","url":null,"abstract":"This study employs a bimodal powder system composed of nanoscale agglomerated spherical particles and micrometer-scale irregular particles to fabricate yttria (Y 2 O 3 ) ceramic cores via Binder Jetting (BJ) technology, aiming to overcome sintering challenges in titanium alloy casting. This study employs an innovative two-step surface modification method for spherical powders: first, coating with 4wt% bis (dioctyl pyrophosphate) vinyl titanate to suppress binder adsorption, followed by activation with 3wt% fatty alcohol polyoxyethylene ether to enhance wettability, ultimately achieving a BJ forming process based on nanopowders. The optimized bimodal mixing ratio (fine powder 24.5%/coarse powder 75.5%) endows the powder bed with exceptional packing density (2.143 g/cm 3 ) and flowability (Hausner ratio=1.41), while the formed green body exhibits excellent bulk density (2.10 ± 0.13 g/cm 3 ) and flexural strength (2.56±0.108 MPa). After sintering at 1700°C, the F24.5C75.5 formulation exhibited accurate anisotropic shrinkage (X-axis: 8.67±0.44%, Y-axis: 9.24±0.46%, Z-axis: 11.64±0.74%), achieving a flexural strength of 23.86±1.2 MPa—a 166% improvement compared to the pure micron-scale formulation—along with a surface roughness of 8.96±0.47 μm, meeting aerospace standard SAE AS71051. Mechanistic analysis revealed that nanoclusters promote interparticle neck formation, while micron-scale particles provided a dimensional anchoring effect, establishing a new paradigm for refractory ceramic additive manufacturing.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"3071-3084"},"PeriodicalIF":0.0,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study presents the development of h-BN/PDMS composite coatings through hydroxylation treatment and modification of hexagonal boron nitride (h-BN) using a vinyl silane coupling agent. The study aims to address the limitations of conventional PDMS coatings, specifically their inadequate mechanical strength and poor resistance to weathering. The innovation lies in the improved dispersion of h-BN within the PDMS matrix, which was achieved via the surface grafting of vinyl groups. This approach, combined with the intrinsic layered structure and high thermal conductivity of h-BN, led to a synergistic enhancement in the mechanical performance and protective functionality of the coating. Experimental results demonstrated that incorporating 8 % modified h-BN increased the tensile strength of the coating to 5.206 MPa, an improvement of 110.6 % over pure PDMS, and reduced erosion depth to 2.7 μm. Furthermore, the coating exhibited minimal adhesive strength loss after UV aging (from 1.085 to 1.012 MPa). Under acidic conditions (pH = 2), the composite coating reduced the mortar strength loss by 53.1 %. In seawater immersion and 25 freeze-thaw cycles, the mass loss rates of the test blocks decreased by 55.9 % and 90.4 %, respectively. In addition, the high UV reflectance (97.6 %) and oxygen barrier properties of h-BN significantly mitigated the photo-oxidative degradation of the PDMS matrix. This study proposes a theoretical foundation and process optimization strategy for designing high-performance protective coatings suitable for use on concrete and electronic components in extreme environments.
{"title":"Properties of vinyl-grafted h-BN/PDMS coatings and their protective effects on mortar surfaces","authors":"Zhijun Liu, Junxiang Lu, Meng Xu, Shaochun Li, Anjie Zhou, Yongjuan Geng, Sai Zhang","doi":"10.1016/j.jmrt.2025.12.026","DOIUrl":"https://doi.org/10.1016/j.jmrt.2025.12.026","url":null,"abstract":"This study presents the development of h-BN/PDMS composite coatings through hydroxylation treatment and modification of hexagonal boron nitride (h-BN) using a vinyl silane coupling agent. The study aims to address the limitations of conventional PDMS coatings, specifically their inadequate mechanical strength and poor resistance to weathering. The innovation lies in the improved dispersion of h-BN within the PDMS matrix, which was achieved via the surface grafting of vinyl groups. This approach, combined with the intrinsic layered structure and high thermal conductivity of h-BN, led to a synergistic enhancement in the mechanical performance and protective functionality of the coating. Experimental results demonstrated that incorporating 8 % modified h-BN increased the tensile strength of the coating to 5.206 MPa, an improvement of 110.6 % over pure PDMS, and reduced erosion depth to 2.7 μm. Furthermore, the coating exhibited minimal adhesive strength loss after UV aging (from 1.085 to 1.012 MPa). Under acidic conditions (pH = 2), the composite coating reduced the mortar strength loss by 53.1 %. In seawater immersion and 25 freeze-thaw cycles, the mass loss rates of the test blocks decreased by 55.9 % and 90.4 %, respectively. In addition, the high UV reflectance (97.6 %) and oxygen barrier properties of h-BN significantly mitigated the photo-oxidative degradation of the PDMS matrix. This study proposes a theoretical foundation and process optimization strategy for designing high-performance protective coatings suitable for use on concrete and electronic components in extreme environments.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"40 1","pages":"3140-3154"},"PeriodicalIF":0.0,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147906921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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