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Study on Fracture Behavior of Si_3N_4 Base Composite Ceramics Adding SiC Nano-powders and SiC whiskers

Sun Lihong 1,Zhu Qifang 1,Wang Ruikun 1,Dong Limin 2, Zhang Baoqing 2,Shen Huizhu 1 and Zhang Xishun 1, (1.General Research Institute for Non ferrous Metals,Beijing 100088 China;2.Tsinghua University,Beijing 100084,China)  
Fracture behavior of SiC(W)/Si 3N 4,SiC(n)/Si 3N 4,SiC(n,w)/Si 3N 4 composite ceramics under loading was studied using SEM,TEM and Knoop indentation method.The result indicates that the fracture character of three composites is mainly intergranular fracture,once in a while shows transgranular fracture on crack path,when the crack encountered whiskers,nano grains and quasiwhiskers,turning,deflection,twist,pulling out and stop of the crack occurred,resulting in depletion of crack propagating energy,so that the development and propagation of the crack were restrained and hindered and hence the strength and the fracture toughness of the nano composites were increased.
【Fund】: 国家自然科学基金!资助项目 ( 59772 0 1 0 )
【CateGory Index】: TQ174
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