摘要
用中间相碳微球 (MCMB)做原料 ,冷模压成型后再经过热处理后得到高密高强模压碳 /石墨材料 ,考察了不同热处理温度对制品的力学性能的影响以及微观结构的变化。实验结果表明 ,与常规方法制备的碳 /石墨材料相比 ,经过热处理的MCMB模压制品具有更高的力学性能。 130 0℃热处理后MCMB模压制品的压缩强度可以达到 2 4 0 .8MPa ,弯曲强度达到 86 .1MPa。微观结构分析表明 ,经过 90 0℃热处理后的制品具有极为密实的结构 ,虽然在更高的温度热处理后 ,制品表面存在着一些小孔和微裂纹 ,但相对于常规碳 /石墨材料而言 ,它们是非常微小的。另外 ,从高倍数SEM分析表明 ,MCMB是比较容易石墨化的碳材料原料。
Mesocarbon microbeads (MCMB) was molded and then heat-treated. In order to seek optimum technical conditions, different heat treatment temperatures (HTT) were examined. Experimental results showed that carbon/graphite artifacts from MCMB exhibited higher mechanical strength than that of the conventional molded carbon/graphite materials. After heat treated at 1300℃, resultant carbon/graphite artifacts from MCMB revealed 86.1MPa in flexural strength and 240.8 MPa in compressive strength. According to analysis of micromechanism of carbon/graphite artifacts, a homogeneous fine mosaic texture was observed over the whole area in the artifact. When the artifacts were heat-treated at higher temperature, small quantities of pores were observed on the surface. But these pores on artifact surface were smaller than those on surface of conventional graphite. Analysis of high-power SEM photograph showed that MCMBs were easy graphitized material.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2004年第2期49-53,共5页
Aerospace Materials & Technology
