CONTROLLED SHEAR STRENGTH OXIDATION-RESISTANT INTERFACIAL FIBER COATINGS

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 36285
Amount: $90,330.00
Phase: Phase I
Program: SBIR
Awards Year: 1997
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Ultramet
12173 Montague Street, Pacoima, CA, 91331
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Sangvavann Heng
 (818) 899-0236
Business Contact
Phone: () -
Research Institution
N/A
Abstract
Continuous fiber-reinforced ceramic matrix composites represent an enabling technology for the next generation of aircraft engines and power generating equipment. The current state-of-the-art in ceramic matrix composites (CMC) for use in oxidizing environments is a silicon carbide (SiC) matrix material reinforced with low-oxygen Nicalon (SiC) fibers, both of which exhibit good oxidation resistance. The interfacial materials currently used, boron nitride (BN) and pyrolytic carbon (pyC), both posses weakly bonded graphitic planes that are able to slip, and their crystallographic orientation and thickness can be manipulated to optimize the interfacial properties. Unfortunately, both of these materials have very poor oxidation resistance at temperatures above approximately 800 and 600¿C, respectively. Thus, when used in a high temperature oxidizing environment, the interfacial coatings are severely attacked, thereby causing the mechanical properties of the composite to be degraded. In this Phase I project, Ultramet will develop an oxidation-resistant interfacial coating system that will allow CMCs to be used in aggressive, oxidizing atmospheres. The coating will not only provide the necessary weak bond between the fibers and the matrix, it will also be chemically compatible with both the fibers and the matrix at elevated temperatures.

* information listed above is at the time of submission.

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