高温热处理对C/C-SiC复合材料制备与力学性能的影响  

Effect of high temperature treatment on the fabrication and mechanical properties of C/C-SiC composites

作　　者：王林山[1] 熊翔[1] 肖鹏[1] 闫志巧[1] 张红波[1] 刘根山[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《新型炭材料》2005年第3期245-249,共5页New Carbon Materials

基　　金：教育部科学技术研究重点项目(02148)~~

摘　　要：以针刺整体炭毡为坯体,采用树脂浸渍和化学气相沉积混合法制备C/C多孔体,然后熔硅浸渗制得C/C-S iC复合材料;研究了C/C多孔体的高温热处理对C/C-S iC复合材料密度、孔隙度、力学性能及断裂方式的影响。结果表明:炭涂层进行高温热处理可改变复合材料的弯曲断裂方式,使其具有一定的“假塑性”,弯曲强度下降约16%,压缩强度提高约20%,硬度增加;C/C多孔体的最终高温热处理可打开孔隙,有利于液S i的渗入,制备出密度较高(>2.0 g.cm-3)、开孔率较小(<4%)的复合材料,但导致其力学性能下降,基本上不影响其断裂方式。C/C preforms were prepared by densification of carbon fiber felts, using furan resin impregnation, carbonization, CVD and an initial high temperature treatment （HTT） at 2 000 - 2 400 ℃ followed by a second resin impregnation and carbonization. The C/C-SiC composites were manufactured by molten silicon infiltration of the as-obtained C/C preforms at 1 650 ℃ with or without a second HTT. The effect of the first HTT on the density, porosity, mechanical properties and fracture mode of the C/C-SiC composites was studied. Results show that the first HTT results in C/C-SiC composites with a “pesuo-plastic” fracture mode and better general mechanical properties. The second HTT of the C/C preforms results in carbon with open porosity, which is favorable for molten silicon infiltration, leading to a C/C-SiC composite with high density and low porosity, but the mechanical properties decrease while the fracture mode is unchanged.

关 键 词：高温热处理 熔硅浸渗 C/C-SIC复合材料 力学性能 断裂方式 

分 类 号：TB332[一般工业技术—材料科学与工程]