ADVANCED PHOSPHORUS BASED MIGRATION RESISTANT ANTI-OXIDANTS FOR CARBON-CARBON COMPOSITE AIRCRAFT BRAKES WITH INCREASED CATALYTIC OXIDATION RESISTANCE

Carbon-carbon composite brakes are one third the weight of typical steel brakes, and they attain strength and frictional properties at temperatures up to 1600°C. C/C composite brakes can endure high temperatures, but in the presence of oxygen they will begin to oxidize at 400°C. Anti-oxidant systems must be applied to the non-rubbing surfaces of the C/C composite stators and rotors to prevent oxidation. Currently, commercial phosphorus based coating materials are made of crystalline metal phosphates that are derived from heat treated phosphoric acid-based liquid precursors painted on the non-rubbing surface of C/C composites. These crystalline metal phosphate coatings are very porous and tend to move to the friction surface when exposed to increased levels of relative humidity. This anti-oxidant migration towards the rubbing surface causes a drop in frictional properties. Migration reduction and oxidation inhibition was improved upon with advanced anti-oxidant systems. The advanced antioxidants analyzed protected the C/C composite from thermal and catalytic oxidation six to ten times better at 650°C than commercial materials. At 871°C, the antioxidants protected the C/C composite from thermal oxidation ten times better than commercial materials. Migration of the antioxidant to the rubbing surfaces was eliminated through the use of advanced antioxidant compositions. The predicted life of the antioxidants was modeled using Avrami's equation. Characterization of the antioxidants was further analyzed through the use of SEM, EDS, and XRD systems.

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

Campus Only Dissertation

Discipline thesis:degree_discipline

Engineering Science

Year dc:date.available

2013

Author dc:creator

• Bolin, Matthew Levi

Contributors dc:contributor

• Don, Jarlen

• Carbon-Carbon Composite
• Catalytic Oxidation
• Migration
• Oxidation Prevention

Repository record dc:identifier

https://opensiuc.lib.siu.edu/dissertations/722

OAI identifier oai:identifier

oai:opensiuc.lib.siu.edu:dissertations-1725