Patent ID: 6159553
Filing Date: 2000-12-12
Classification: C04B,C23C,Y02T

Abstract:
Method of producing a thermal barrier coating for a component subject to thermal stress comprising the steps of:(a) providing a silicon nitride substrate;(b) applying a composition, said composition including a powder containing silicon nitride, boron nitride and sintering aids, upon said silicon nitride substrate, said powder containing about 70-90 weight percent silicon nitride, about 1-20 weight percent boron nitride, and a balance of sintering aids of oxides of at least one element selected from the group consisting of Sc, Y, La, Mg, Ca, Sr, and Ba; and(c) drying and sintering the composition produced in accordance with step (b) at temperatures and times sufficient to produce said thermal barrier coating having whisker-shaped beta silicon nitride grains therein.