硼含量对碳硼化合物结构、力学影响行为研究（英文）

发布时间：2018-01-25 18:33

本文关键词： 碳硼化合物微观结构力学性质低压化学气相沉积　出处：《无机材料学报》2017年11期 　论文类型：期刊论文

【摘要】：利用低压化学气相沉积技术,以BCl_3-C_3H_6-H_2为反应气体制备了不同掺硼量的热解碳薄膜B_xC_(1 x)(x=0.05,0.10,0.16,0.30,0.50),并研究了硼含量对BxC1 x微观结构及力学性能的影响。B0.1C0.9展现了高度结晶的类石墨结构,其中大部分B取代石墨层中的C。随着B含量上升,B主要形成B C键,B_xC_(1 x)结构向无定型转变。纳米压痕测试结果显示,B0.1C0.9的弹性模量和硬度较低,载荷位移曲线显示其力学变形接近弹性变形,随着B含量增加,碳化硼生成量增加,其弹性模量和硬度显著提升,载荷位移曲线表现出典型的脆性材料力学行为。
[Abstract]:Using low pressure chemical vapor deposition technique, the pyrolytic carbon thin films with different boron content were prepared by using BCl_3-C_3H_6-H_2 as reaction gas. 0.10 (0.16) 0.30 (0.50). The effect of boron content on the microstructure and mechanical properties of BxC1 x. B0.1C0.9 showed a highly crystallized graphite-like structure. Most of them replaced C in graphite layer. With the increase of B content, B / C bond was mainly formed. The structure of B / C bond was changed to amorphous type. The results of nano-indentation test showed that. The elastic modulus and hardness of B0.1C0.9 are lower, and the load-displacement curve shows that the mechanical deformation is close to elastic deformation. With the increase of B content, the formation of boron carbide increases, and the elastic modulus and hardness of B0.1C0.9 increase significantly. The load-displacement curve shows typical mechanical behavior of brittle materials.
【作者单位】：中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室;中国科学院上海硅酸盐研究所结构陶瓷与复合材料工程研究中心;中国科学院大学;上海科技大学物质科学与技术学院;东华大学分析测试中心;
【基金】：National Natural Science Foundation of China(51502323) Shanghai Natural Science Foundation(14ZR1445800) Shanghai Key Project of Basic Research(14JC1406200) Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures(SKL201601)
【分类号】：TB383.2
【正文快照】： Continuous fiber reinforced silicon carbide ceramicmatrix composites(CMCs),such as C/Si C,Si C/Si C,arepopular in the aviation and aerospace fields because oftheir low density,excellent mechanical property,espe-cially at high temperature[1-3].In CMCs,pyr

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