Improved oxidation protection for carbon - carbon composite materials and graphite

摘要

The invention provides for oxidatively resistant carbon/carbon composites and other graphite-like material, a method for the preparation of these materials, and their use in high temperature applications, preferably in brakes for airplanes. The carbon/carbon composite or graphite-like material, which is resistant to oxidation at high temperatures comprises a fiber-reinforced carbon/carbon composite or graphite in contact with a phosphoric acid based penetrant salt solution which contains the ions formed from the combination of the following: 10-80 wt% H2O, 20-70 wt% H3PO4, 0-25 wt% MnHPO4.1.6H2O, 0-30 wt% A(H2PO4)3, 0-2 wt% B2O3, 0-10 wt% Zn3(PO4) 2 and 0.1-25 wt% alkali metal mono-, di-, or tri-basic phosphate.