Project Title:

Improved Barrier Coatings for Continuous SiC Fibers in Ceramic

Advanced Ceramics Corporation
11907 Madison Avenue
Lakewood, OH 44107

93-1-04     21   3962

Improved Barrier Coatings for Continuous SiC Fibers in Ceramic
Composites

Abstract:

A new barrier coating for protection of continuous SiC fibers in
composites up to 1500C will be applied to continuous fiber tows
by chemical vapor deposition (CVD) in commercial apparatus.
Current SiC fibers, and currently used BN barrier coatings, are
restricted to use below 1100C and are unsuitable for use in
turbine combustors and other high temperature applications.   
Two CVD compositions in the BN/TiN system and two compositions in
another system. Interfacial shear properties, oxidation and
moisture resistance, thermal expansion coefficients and chemical
analyses will be obtained on well defined bulk SiC before coating
continuous tows. Average coating thickness, coating uniformity
and textile handling behavior of the coating systems will be
evaluated before selecting a preferred system to be scaled up in
Phase II.

Enables continuous ceramic fiber composites (CFCC) to be used at
temperatures up to 1500C, permitting development of ceramic
combustors and hot parts for advanced turbine engines.
Non-aerospace applications of barrier-coated CFCC include
stationary power turbine components, radiant tube burners,
gas-flow heat exchangers and filters, and waste incineration
systems.

Boron Nitride, Ceramic Composites, Ceramic Fibers, Chemical Vapor
Deposition (CVD), Interfaces, Shear Strength, Silicon Carbide