Patent ID: 6042951
Filing Date: 2000-03-28
Classification: C23C,Y02T,Y10T

Abstract:
A ceramic-coated blade of a gas turbine comprising a substrate made of a heat-resistant alloy containing Ni as a main component, an alloy coating layer of MCrAlY alloy which is formed on a surface of said substrate and which MCrAlY has high-temperature oxidation and corrosion resistance superior to said heat-resistant alloy, and in which MCrAlY, M is at least one selected from the group consisting of Co, Ni, and Fe, and a heat-resistant ceramic layer formed on said alloy coating layer,said heat-resistant ceramic layer being a mixture of ion-conductive ceramic, which ion-conductive ceramic is composed of at least partially-stabilized ZrO.sub.2 -based ceramic, and insulative ceramic, andsaid mixture being provided with a columnar structure in which columnar crystals are grown in a direction of a thickness of the coating, and said insulative ceramic being composed of at least one selected from the group consisting of Al.sub.2 O.sub.3, SiO.sub.2, Hf.sub.2 O.sub.3, BN, AlN and Si.sub.3 N.sub.4, the content of which insulative ceramic in said heat resistant ceramic layer is in a range of 5 wt. % to 50 wt. %.