Patent ID: 8230797

Claim:
A method of forming an inter-diffusion resistant matrix in an alloy coating positioned on a substrate comprising: supplying a coating composition having the formula: Fe—XCr—YNi—ZAl wherein X has a value of 20-30 weight percent, Y has a value of 30-50 weight percent, Z has a value of 0-10 weight percent and Fe accounts for the remainder of the alloy composition, where the total X, Y, Z and the amount of Fe is 100 weight percent; applying said coating composition to a substrate and heating the coating composition to form the matrix, wherein the heating forms a face-centered-cubic (fcc) phase identified by the presence of a cubic unit cell in Space Group 225, wherein the value of a 1 and a 2 is about 0.36 nm and the value of a 3 is also about 0.36 nm wherein the fcc phase comprises 20-25 weight percent Cr, 30-50 weight percent Ni, and the remainders are Fe and Al.