原位反应工艺制备SiC颗粒增强MoSi2基复合材料的金相分析.doc

毕业论文(设计)
2016 届材料成型及控制工程专业 1206091班级
题目原位反应工艺制备
SiCp/MoSi2复合材料的金相分析
内容摘要
金属间化合物二硅化钼是性能介于金属与陶瓷之间的一种新型的功能结构一体化材料,而二硅化钼基复合材料是一种新型的超高温结构材料,近些年来受到了国内材料研究工作者们的普遍重视,其制造工艺也得到了不断地改进。
本文根据原位复合的基本思想,以Mo粉、Si粉、C粉的原始粉末为原料,然后进行原位反应高温热压一次复合工艺制备纯MoSi2和含SiC体积分数为20%、40%、和60%的SiCp/MoSi2复合材料。经过对试样的处理,利用单目金相显微镜对样品进行检测,然后进行下一步的金相分析。
研究结果表明:各试样的组织结构基本相同,主要是MoSi2和SiC,而纯MoSi2试样的组成相除了MoSi2外,同时还有少量的Mo5Si3和SiO2。SiCp/MoSi2复合材料的显微组织比纯MoSi2试样细小,随着SiC含量的增加,晶粒逐渐细化,并且减少和消除了脆性的SiO2玻璃相,抑制了Mo5Si3等含Si量的少的物相的生成。
本实验的创新点在于通过对由原位反应工艺制备不同体积百分含量SiC的SiCp/MoSi2复合材料的金相分析,观察与比较其微观组织,探讨其性能,使这种复合材料能够得到更好的应用。
关键词
SiCp/MoSi2复合材料;原位反应;金相;显微组织
The metallographic analysis of SiCp/posites prepared by the situ reaction process
Abstract
pound molybdenum disilicide performance between metal and ceramics is a new functional material structure integration, and molybdenum disilicide posite is a new type of ultra high temperature structural materials, in recent years, the domestic materials research workers generally attach importance to the material, the manufacturing process has been constantly improved.
According to the basic idea of situ reaction ,we use Mo powder, Si powder, C powder as raw material powder, then through in situ reaction hot pressing process to prepare pound containing pure MoSi2 and SiC volume fraction of 20%, 40%, and 60% SiCp / posite sample . Through to sample processing, using monocular metallographic microscope to test the samples, and then on to the next step of metallographic analysis.
The results show that : anizational structure of each sample is basically the same , mainly incluing MoSi2 and SiC. ponents of the pure MoSi2 sample is MoSi2 , but there are a small number of Mo5Si3和SiO2. The microstructure of SiCp / posite sample is smaller than pure
MoSi2 .with SiC content increase,the grains refinement, and reduce and eliminate the brittle SiO2 glass phase such as suppressing Mo5Si3 and other Si-containing formation.
The innovation of this experiment is observing paring mi