Patent ID: 7442443

Claim:
A component for an aircraft brake assembly, the component comprising: a) a substrate of 17-4PH OX HT alloy having a wear surface; and b) an adherent coating of lubricious oxides comprising copper oxide, chromium oxides, and iron oxides, wherein the coating is formed from a base layer of iron oxide, chromium, nickel, and copper on the surface of the alloy, the base layer formed by heating a 17-4PH stainless steel alloy in flowing air for about two hours at about 1875° F. to 1925° F. with an air flow of about 10-30 cubic feet per hour, wherein the 17-4PH stainless steel alloy has the following composition CHEMISTRY Element Min. wt. % Max. wt. % C — 0.060 P — 0.025 S — 0.025 Si 0.50 1.00 Mn — 0.70 Al — 0.05 Cr 15.50 16.70 Ni 3.600 4.60 Nb 0.15 0.40 Cu 2.80 3.50 Ta — 0.05 Sn — 0.02 N — 0.05 Fe Balance Balance and further comprising a chromium-iron-nickel metallic phase.