Development of Phosphorus Based Migration Resistant Anti-Oxidants for Carbon-Carbon Composite Aircraft Brakes

Matthew Levi Bolin, Southern Illinois University Carbondale

Abstract

Carbon-Carbon is a composite material made from a carbon fibrous substrate organized tightly into a carbon based matrix. Anti-oxidants are applied to the non-rubbing surfaces of the C/C composite brakes of aircrafts to prevent oxidation. Research performed by Dr. Jarlen Don and Z. Wang found problems with existing anti-oxidant systems. High relative humidity allows the anti-oxidant to migrate from the non-rubbing surfaces to the rubbing surfaces of the brake composite. This eventually results in a drop in the coefficient of friction and loss of braking properties. In order to fix the problems associated with migration, we have found the precise temperature char profile and formulating a precise chemical composition needed to reduce migration of the anti-oxidant to the rubbing surfaces when introduced to high relative humidity environments. Since Carbon-carbon (C/C) composites have retention of strength at high temperatures, they have been used for many government and private applications. Upon finding the proper temperature char profile and precise chemical composition, anti-oxidant migrations have been reduced significantly therefore improving the braking capability of aircraft brakes.

 

Access

This thesis is only available for download to the SIUC community. Others should
contact the interlibrary loan department of your local library.