致密碳化硼基陶瓷的强韧化机理研究进展  

Progress in Strengthening Mechanism of Dense Boron Carbide-based Ceramics

作　　者：杨昊 李享成[1] 丁军[1] 余超[1] 邓承继[1] 祝洪喜[1] YANG Hao;LI Xiangcheng;DING Jun;YU Chao;DENG Chengji;ZHU Hongxi(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《陶瓷学报》2022年第4期579-592,共14页Journal of Ceramics

基　　金：湖北省重点研发计划(2020BAA028);国家自然科学基金(U20A20239)。

摘　　要：针对碳化硼陶瓷难烧结、韧性低的缺点,通过引入稀土化合物、SiC、过渡金属硼化物、碳纳米管、石墨烯以及金属相等增强相能够充分发挥碳化硼陶瓷高硬度、高强度的优势,扩大其作为重要结构陶瓷的应用范围。相对而言,SiC与TiB_(2)是目前B_(4)C最有效的增强、增韧相,两者复合添加时,其强韧化机制包括颗粒增韧、固溶强化、热膨胀系数失配导致的裂纹偏转、桥接作用。从不同增强、增韧相与碳化硼间的搭配以及引入方式出发,探讨了碳化硼基陶瓷的强韧化机理与行为,并展望了其多元、多结构体系设计的主要方向。Boron carbide is difficult to sinter and has low toughness.To address this problem,rare earth compounds,SiC,transition metal borides,carbon nanotubes,graphene and metal phase have been employed to increase mechanical properties of boron carbide ceramics,thus widening its application range as structural materials.Among the various additives,SiC and TiB_(2) are effective reinforcement phases of boron carbide ceramics,with strengthening and toughening mechanisms including particle toughening,solid solution enhancement and crack deflection and bridging due to the thermal expansion mismatch.The strengthening and toughening mechanisms will be discussed from the viewpoint of the mismatches of reinforcement phases and boron carbide,as well as the introduction method.In addition,the main direction of multi-diverse and multi-structural system design will discussed.

关 键 词：SiC TiB_(2) 碳化物/硼化物复合 增韧补强 

分 类 号：TQ174.75[化学工程—陶瓷工业]