Patent ID: 6093369
Filing Date: 2000-07-25
Classification: C22C,C22F,C23C,H01C,H05B

Abstract:
An oxidation-resistant alloy for use in a high temperature oxidizing environment, the alloy consisting essentially of, in weight percent:a nickel-based matrix including about 19-23 chromium and about 3-6 aluminum;a self-healing thermodynamically stable oxide layer formed upon a surface of the matrix which is exposed to the oxidizing environment over a range of temperatures for extended periods of time, the layer protecting the alloy from the oxidizing environment;about 0.005-0.05 calcium and about 0.01-0.06 yttrium for removing or stabilizing oxygen and sulphur dissolved in the matrix, thereby permitting the aluminum in the matrix to combine with oxygen in the environment to form a means for healing the layer and the surface if the layer is damaged or spalls;about 2-8 iron for inhibiting nucleation and growth of a nickel aluminum intermetallic compound that would adversely harden the alloy and cause local disturbance of a uniform distribution of the aluminum; anda balance of impurities, the alloy after aging having a VHN below about 350.