Microstructural Characterization of Diamond/SiC Composites Fabricated by RVI
Diamond/Si/C porous preform was prepared with phenolic resin,Si,Diamond and graphite.Subsequent reactive vapor infiltration (RVI) of gaseous silicon at 1600 ℃ for 2 h in vacuum atmosphere resulted in the formation of a compact Diamond/SiC composite.The influence factors of perform porosity were investigated,including process pressure and raw materials.Density and microstructure of Diamond/SiC composites were also discussed.The results showed that the open porosity of preform was mainly influenced by the pressing pressure.It can also be affected by the content,morphology and the particle size of diamond.The preform with open porosity higher than 20% after RVI treatment can obtain Diamond/SiC composites with high density.However,over-high porosity of the perform will cause a mass ofunreacted Si exists in the composite which is unfavorable for its application.In order to reduce the content of residual Si,open porosity of preform should be no higher than 40%.
Diamond/SiC Reactive vapor infiltration Microstructure
Zhenliang Yang Xinbo He Mao Wu An Ma Rongjun Liu Xuanhui Qu
School of Materials Science and Engineering,University of Science & Technology Beijing,Beijing 10008 State Key Laboratory of Advanced Fibers & Composites,College of Aerospace & Materials Engineering,Na
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1105-1110
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）