首页|铜增韧Mo2BC陶瓷的力学性能和摩擦学性能

铜增韧Mo2BC陶瓷的力学性能和摩擦学性能

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采用快速热压反应烧结法制备高强韧Mo2BC/Cu陶瓷基复合材料.研究铜含量对Mo2BC/Cu复合材料的微观组织、力学性能和摩擦学性能的影响,并对其增韧机制和磨损机理进行分析.研究结果表明:Cu均匀地分散在Mo2BC基体中,具有细化晶粒的作用.Mo2BC/Cu复合材料中铜可以添加的最大质量分数为7.5%.随着铜含量的增加,Mo2BC/Cu复合材料的弯曲强度和断裂韧性增加.当Cu质量分数为7.5%时,复合材料的弯曲强度和断裂韧性最高,分别为625.1 MPa和7.4 MPa·m1/2,与Mo2BC陶瓷相比,分别提高了24%和62%,其主要的增韧机制为铜的塑性变形、晶粒拔出、桥接效应和裂纹的偏转.此外,铜的添加还可以明显提高Mo2BC/Cu复合材料的摩擦磨损性能.当Cu质量分数为2.5%时,复合材料的摩擦因数可低至0.36,磨损量最小,耐磨性最优,其主要的磨损机制为轻微的二体磨粒磨损和氧化磨损.
Mechanical and tribological properties of Mo2BC ceramic toughened by copper
High strength and toughness Mo2BC/Cu ceramic matrix composites were fabricated by in-situ reaction fast hot-pressing sintering method.The effect of Cu content on the microstructure,mechanical and tribological properties was investigated.The wear and toughening mechanisms of the composites were discussed as well.The results show that Cu is distributed uniformly in the Mo2BC matrix and plays a role of refining grains.The maximum mass fraction of Cu addition is confirmed to be7.5%for Mo2BC/Cu composites.The flexural strength and fracture toughness of as-sintered composites increase with the increase of Cu content.When the mass fraction of Cu is 7.5%,the flexural strength and fracture toughness of Mo2BC/Cu composites have the highest values of 625.1 MPa and 7.4 MPa·m1/2,which increase by 24%and 62%compared with that of Mo2BC ceramic,respectively.Plastic deformation,grain pull-out,crack bridging and deflection are the main toughening mechanisms.The addition of Cu significantly improves the friction and wear properties of Mo2BC/Cu composites.When the mass fraction of Cu is 2.5%,the friction coefficient of the composite can be as low as 0.36,showing that the wear loss is the lowest and the wear resistance is the best.The main wear mechanisms are slight two-body abrasion and oxidation wear.

ceramic matrix compositesMo2BChigh strength and toughnessfriction and wear

张智源、王帅、逄显娟、刘娟、祝林、杜三明、张永振

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河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳,471023

河南工学院材料科学与工程学院,河南新乡,453003

陶瓷基复合材料 Mo2BC 高强韧 摩擦磨损

国家自然科学基金资助项目国家自然科学基金资助项目中国博士后科学基金资助项目河南省自然科学基金资助项目

92266205518055132022M712942222300420436

2024

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子:0.938
ISSN:1672-7207
年,卷(期):2024.55(8)
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