Patent ID: 6287644
Filing Date: 2001-09-11
Classification: C23C,Y02T

Abstract:
A method of a forming a protective coating on a substrate, the method comprising:(i) melting a source ingot;(ii) evaporating the melted source ingot to create materials to be deposited; and(iii) depositing said materials in a controlled manner so as to form the protective coating;the protective coating comprising a continuously-graded bond coat, the continuously-graded bond coat comprising:(i) a gradient of at least one material characteristic, the gradient extending from a first value for the material characteristic at a first surface region to a second value for the material characteristic at a second surface region;(ii) a. at least one of: chromium (Cr), silicon (Si), hafnium (Hf), zirconium (Zr), yttrium (Y), compounds, alloys, and combinations thereof;b. at least one phase selected from the group consisting of .alpha.-Cr and Cr3Si; andc. at least one of nickel and aluminum;wherein the first surface region comprises at least one of aluminum and nickel, and the second surface region comprises at least one of: chromium (Cr), silicon (Si), hafnium (Hf), zirconium (Zr), yttrium (Y), compounds, alloys, and combinations thereof and phases selected from .alpha.-Cr or Cr3Si.