Development of CVD Mullite Coatings for SiC Fibers

Sarin, V. K. ; Varadarajan, S.

Oak Ridge National Laboratory

关键词: Tensile Properties;    Materials Testing;    Vapor Deposited Coatings;    36 Materials Science;    Fibers;   

DOI  :  10.2172/755649
RP-ID  :  ORNL/Sub/94-SS110/04
RP-ID  :  AC05-00OR22725
RP-ID  :  755649

美国|英语

来源: UNT Digital Library

【 摘 要 】

A process for depositing CVD mullite coatings on SiC fibers for enhanced oxidation and corrosion, and/or act as an interfacial protective barrier has been developed. Process optimization via systematic investigation of system parameters yielded uniform crystalline mullite coatings on SiC fibers. Structural characterization has allowed for tailoring of coating structure and therefore properties. High temperature oxidation/corrosion testing of the optimized coatings has shown that the coatings remain adherent and protective for extended periods. However, preliminary tests of coated fibers showed considerable degradation in tensile strength.