(西安交通大学金属材料及强度国家重点实验室，西安710049)
摘 要: 研究了树脂对碳毡硅化处理后的显微组织与性能影响。结果表明：未浸渍树脂的碳毡硅化处理后的显微组织特点是反应生成的碳化硅颗粒细小且均匀分布在游离硅中；而浸渍树脂的碳毡硅化处理后的显微组织特点是反应生成的碳化硅颗粒粒径及分布均不均匀。大颗粒碳化硅的出现造成了试样断裂强度的降低。XRD结果表明Si-SiC复相陶瓷的主晶相为α-SiC，β-SiC和游离Si，不同晶型SiC的出现与试样烧结过程中Si/C反应的放热过程有关。
关键字: 树脂；碳毡；Si-SiC复相陶瓷；显微组织
（State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, P.R.China）
Abstract:The microstructure and properties of Si-SiC composites prepared by reaction sintering of liquid silicon and carbon felt with or without phenol resin impregnation were investigated. Experimental results showed that when carbon felt was used as reactant, the reaction-formed SiC particles were small and uniform in size and distribution. As for the impregnated carbon felt, the reaction-formed SiC particles were nonuniform in size and distribution, and the smaller SiC particles would dissolve with the increase of sintering time. The appearance of the large SiC particles resulted in the decrease of fracture strength. XRD results showed that the fabricated Si-SiC composites were composed of α-SiC, β- SiC and Si. The polytype of SiC was related to the reaction-heat during the sintering.
Key words: resin; Si-SiC composite; carbon felt; microstructure
