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熔渗温度对MoSi2(Cr5Si3)-RSiC复合材料显微结构和性能的影响
作者:高朋召1 2 张小亮1 黄诗婷1 刘井雄1 肖汉宁1 
单位:1.湖南大学材料科学与工程学院 长沙410082  2.西安交通大学 金属材料强度国家重点实验室 西安710049 
关键词:二硅化钼-再结晶碳化硅复合材料 三维互穿网络结构 力学性能 电学性能 改进型混合规则 
分类号:TB35
出版年,卷(期):页码:2014,42(9):1105-1110
DOI:10.7521/j.issn.0454-5648.2014.09.04
摘要:

以RSiC为基体,通过酚醛树脂浸渍裂解(PF-PIP)和MoSi2-Si-Cr合金活化熔渗(AMMI)复合工艺制备具有三维互穿网络结构的MoSi2(Cr5Si3)-RSiC复合材料。借助于X射线衍射、扫描电子显微镜、力学性能和电阻率测试等研究了熔渗温度对复合材料组成、显微结构、力学性能和导电性能的影响。采用改进型混合规则探讨了复合材料互穿网络结构和界面结合性对其导电方式的影响。结果表明:不同温度所制备的复合材料主要组成均为SiC、MoSi2和Cr5Si3;随着熔渗温度的升高,复合材料气孔率和体积电阻率下降,密度、抗弯强度和弹性模量提高。当熔渗温度为1900℃时,复合材料的气孔率、密度、抗弯强度、弹性模量和体积电阻率分别为1.4%、3.5g/cm3、99.2MPa、313.60GPa和124.2mΩ•cm。当熔渗温度较低时(1700℃),复合材料的导电方式与颗粒增强复合材料的导电方式接近,随温度升高,复合材料的导电方式与传统复合材料的导电方式差别增大。

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MoSi2(Cr5Si3)-re-crystallized SiC[MoSi2(Cr5Si3)-RSiC] composites with the 3D interpenetrated network structure were prepared by a combination melting infiltration (AAMI) composite process with phenolic resin(PF), impregnation-pyrolysis(PIP), and MoSi2-Si-Cr alloy. The influence of infiltration temperature on the composition, microstructure, mechanical and electrical properties of the composite were characterized by X-ray diffraction, scanning electron microscopy, mechanical and volume resistivity test. In addition, the influences of interpenetrated network structure as well as the interfacial properties on the electrical conductivity properties of the composites were also analyzed via the modified mixture rule. The results show that the composites infiltrated at different temperatures contain the similar phases of SiC, MoSi2 and Cr5Si3. The porosity and volume resistivity of composites decrease, and the density, flexural strength and elastic modulus all increase with the increase of the infiltration temperature, and the relative data of the composites infiltrated at 1900℃ are 1.4%, 3.5g/cm3, 99.2MPa, 313.60GPa and 124.2mΩ•cm, respectively. The electrical conductive mode of composites is similar to that of particle reinforced composites at a low infiltration temperature (i.e., 1700℃). The difference of conductive mode between the two kinds of composites increases when the infiltration temperature increases.

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基金项目:
国家自然科学基金(51372078, 51302076), 湖南省自然科学基金(12JJ4054)和材料强度国家重点实验室(20111202)资助。
作者简介:
第一作者:高朋召(1976—),男,博士,副教授。
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