(西安交通大學金屬材料及強度國家重點實驗室，西安710049)
摘 要: 研究了樹脂對碳氈硅化處理后的顯微組織與性能影響。結果表明：未浸漬樹脂的碳氈硅化處理后的顯微組織特點是反應生成的碳化硅顆粒細小且均勻分布在游離硅中；而浸漬樹脂的碳氈硅化處理后的顯微組織特點是反應生成的碳化硅顆粒粒徑及分布均不均勻。大顆粒碳化硅的出現(xiàn)造成了試樣斷裂強度的降低。XRD結果表明Si-SiC復相陶瓷的主晶相為α-SiC，β-SiC和游離Si，不同晶型SiC的出現(xiàn)與試樣燒結過程中Si/C反應的放熱過程有關。
關鍵字: 樹脂；碳氈；Si-SiC復相陶瓷；顯微組織
（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
