| SiC纳米及晶须增强Si_3N_4基复相陶瓷断裂行为的研究 |
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| 引用本文： | 孙丽虹,朱其芳,王瑞坤,董利民,张宝清,沈惠珠,张希顺.SiC纳米及晶须增强Si_3N_4基复相陶瓷断裂行为的研究[J].稀有金属,2000(5). |
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| 作者姓名： | 孙丽虹 朱其芳 王瑞坤 董利民 张宝清 沈惠珠 张希顺 |
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| 作者单位： | 北京有色金属研究总院!100088(孙丽虹，朱其芳，王瑞坤，沈惠珠，张希顺)，清华大学!北京100084(董利民，张宝清) |
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| 基金项目： | 国家自然科学基金!资助项目 ( 59772 0 1 0 ) |
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| 摘 要： | 用扫描电镜、透射电镜及努氏压痕法研究了添加SiC晶须、纳米颗粒及晶须和纳米颗粒的三种Si3N4基复相陶瓷在外力作用下的断裂行为。这三种材料断裂的主要方式是沿晶断裂 ,偶尔可见穿晶断裂。在裂纹发展的路径上当裂纹尖端遇到了晶须、集聚的纳米颗粒及类晶须时 ,会产生扭转、偏转、断裂、拔出和终止 ,从而使裂纹能量消耗 ,抑制和阻碍了裂纹的扩展和传播 ,起到了增韧补强的作用。
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| 关 键 词： | Si_3N_4基复合陶瓷 晶须 纳米颗粒 裂纹扩展 |
Study on Fracture Behavior of Si_3N_4 Base Composite Ceramics Adding SiC Nano-powders and SiC whiskers |
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| Sun Lihong ,Zhu Qifang ,Wang Ruikun ,Dong Limin ,Zhang Baoqing ,Shen Huizhu and Zhang Xishun.Study on Fracture Behavior of Si_3N_4 Base Composite Ceramics Adding SiC Nano-powders and SiC whiskers[J].Chinese Journal of Rare Metals,2000(5). |
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| Authors: | Sun Lihong Zhu Qifang Wang Ruikun Dong Limin Zhang Baoqing Shen Huizhu and Zhang Xishun |
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| Affiliation: | Sun Lihong 1,Zhu Qifang 1,Wang Ruikun 1,Dong Limin 2,Zhang Baoqing 2,Shen Huizhu 1 and Zhang Xishun 1, |
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| Abstract: | 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. |
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| Keywords: | Si 3N 4 base composite ceramics whisker nona grain propagating of crack |
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