Microstructural Characterization of Diamond/SiC Composites Fabricated by RVI

Abstract:

Diamond/Si/C porous preform was prepared with phenolic resin, Si, Diamond and graphite. Subsequent reactive vapor infiltration (RVI) of gaseous silicon at 1600 °C 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 of unreacted 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%.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1105-1110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1105
• Online since: June 2012
• Authors: Zhen Liang Yang, Xin Bo He, Mao Wu, An Ma, Rong Jun Liu, Xuan Hui Qu
• Keywords: Diamond/SiC, Microstructure, Reactive Vapor Infiltration

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