Research progress of BN interphase and its multilayers in SiC_f/SiC composites

Abstract

SiCf/SiC composites are consisted of SiC fibers, SiC matrix and interphase. The interphase can transfer stresses from matrix to SiC fibers and deflects microcracks, at the same time, it protects SiC fibers from chemical erosion during the preparation and use of materials, which plays a very important role in regulating the properties of SiCf/SiC composites. In this paper, the effects of precursor gas ratio, carrier gas, deposition pressure, temperature on the deposition rate and microstructure of interphase during the chemical vapor infiltration (CVI) process are summarized. It will be the key and difficult point in the research of SiCf/SiC composite interphase to select appropriate process conditions and prepare BN and its composite multilayer with ideal structure.

Keywords

• sic_f/sic composites
• chemical vapor infiltration
• bn interphase
• multilayer