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二硼化锆超高温陶瓷的强韧化
作者:汪长安1 王海龙1 2 王明福1 3 
单位:1. 清华大学材料学院 新型陶瓷与精细工艺国家重点实验室 北京 100084 2. 郑州大学材料科学与工程学院 郑州 450001  3 北京动力机械研究所 北京 100074 
关键词:二硼化锆 强韧化 碳化硅 层状结构 力学性能 
分类号:TQ174
出版年,卷(期):页码:2018,46(12):0-0
DOI:
摘要:

 以ZrB2为基体材料,分别采用添加SiC颗粒(SiCp)、SiC晶须(SiCw)和SiC晶片(SiCpl)作为增韧相,采用热压烧结技术制备了SiC/ZrB2陶瓷基复合材料,分析了不同增韧相的种类和添加量对ZrB2陶瓷强韧化效果的影响,并通过层状结构设计,采用放电等离子体烧结工艺制备出ZrB2基层状复合陶瓷材料,研究了层状结构对ZrB2陶瓷强韧化效果的影响。结果表明:添加SiC颗粒、晶须或晶片,采用热压烧结可以制备出接近完全致密的SiC/ZrB2陶瓷基复合材料;与单独添加SiC颗粒或晶须相比,同时添加SiC颗粒和晶须的增韧效果更加明显,而SiC晶片也可以起到较好的强韧化效果;通过层状结构设计,能够较大幅度地提高ZrB2陶瓷的断裂韧性,显示了很好的增韧效果。

 SiC/ZrB2 ceramic matrix composites were prepared by hot-pressing sintering (HP) using SiC particles, SiC whiskers and SiC platelets as reinforcements, respectively. The effects of type, shape and additive amount of the SiC reinforcements on mechanical properties of the SiC/ZrB2 ceramic matrix composites were investigated. Through laminated structure design, ZrB2-based laminated ceramic matrix composites were prepared by spark plasma sintering (SPS), and the reinforcing effects of laminated structure on ZrB2-based ceramics were also discussed. The results showed that the SiC/ZrB2 ceramic matrix composites with almost full density could be prepared through adding SiC particles, whiskers or platelets by hot-pressing sintering. Compared to individual addition of SiC particles or whiskers, co-adding SiC particles and whiskers showed better toughening effects, and SiC platelets also showed better strengthening and toughening effects. Through laminated structure design, the fracture toughness of ZrB2 ceramics could be improved remarkably which shows good toughening effects.

基金项目:
国家自然科学基金(90816019);国防“973”项目(2006CB605207)资助。
作者简介:
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