金属第二相调控氮化硅陶瓷性能的研究进展

Research Progress in Properties of Silicon Nitride Ceramics Modified with Metal Second Phases

氮化硅是综合性能优异的结构陶瓷材料,而脆性依然是制约其应用的短板。引入延性金属颗粒被认为是改善陶瓷脆性的重要方法之一。近年来,研究者尝试将金属颗粒引入到氮化硅陶瓷中以改善其断裂韧性。然而,由于氮化硅陶瓷烧结温度远高于多数金属的熔点、热膨胀系数与金属不匹配以及二者之间高温化学不相容、界面润湿性较差等问题,为金属引入到氮化硅陶瓷带来了极大的困难。综述了近年来将不同金属引入氮化硅陶瓷的相关研究进展,重点总结了针对上述问题的研究思路及其改善效果,并对未来发展方向进行了展望。

Silicon nitride ceramics are typical structural ceramics with excellent comprehensive properties,while brittleness is still their shortcoming in application.Introduction of ductile metal particles is regard as an important method to adjust the brittleness of ceramics.In recent years,attempts have been made to improve the properties of silicon nitride ceramics by introducing metal particles.Nevertheless,because the high sintering temperature of silicon nitride ceramics is much higher than the melting point of most metals,together with problems,such as thermal expansion coefficient mismatch,high temperature chemical incompatibility,poor interface wettability and so on,the introduction of metal into silicon nitride ceramics could bring great difficulties.In this work,the related works of the introduction of different metals into silicon nitride ceramics as second phase in recent years will be reviewed,including the solutions to tackle the above problems and enhancement in performance.Finally,the problems and existing solution of metal introduction into silicon nitride ceramics are summarized and a simple prospect is given.