Microstructure and properties of C/C-SiC composites prepared by reactive melt infiltration at low temperature in vacuum
Microstructure and properties of C/C-SiC composites prepared by reactive melt infiltration at low temperature in vacuum
复制标题
真空低温反应熔渗制备C/C-SiC复合材料的组织与性能
DOI：
10.1016/j.ceramint.2019.11.195
复制
发表时间：
2020-04-15
影响因子：
5.2
通讯作者：
Zheng, Jiaqi
中科院分区：
文献类型：
--
作者：
Liu, Lei;Zhang, Leilei;Zheng, Jiaqi
在Si粉中加入20- 40wt%的Al，在1100-1200 ℃真空条件下，采用反应熔渗法制备了致密的C/C-SiC复合材料。XRD和EDS分析表明复合材料由碳、SiC、Al和残余Si组成。具有20%wt. Al具有最大的压缩强度和压缩模量，而30wt%的Al具有最高的密度和热膨胀系数。复合材料中的微裂纹是压缩行为的主要原因，并导致复合材料的热膨胀率在30 ~ 40wt% Al范围内降低。
Dense C/C-SiC composites were prepared by reactive melt infiltration at 1100-1200 degrees C in vacuum through addition of 20-40 wt% Al into Si powder. XRD and EDS analysis showed that the composites were composed of carbon, SiC, Al and residual Si. The composite with 20% wt.% Al had the maximum compressive strength and modulus, while the composite with 30 wt% Al possessed the highest density and thermal expansion coefficient. The micro-cracks in composites were responsible for the compressive behavior, and caused decrease of thermal expansion of the composites from 30 to 40 wt% Al.