Two-ply ceramic layer with different microstructures

Abstract

A two-ply heat-insulating ceramic layer is provided with a highly porous crackfree lower ply and an outermost heat-insulating ply with vertical cracks in order to ensure both a high heat insulation as well as a high erosion resistance. In one aspect is a layer system having a two-ply, outermost ceramic layer, which has a lower ceramic layer and an outermost ceramic layer. The lower ceramic layer has a porosity of at least 5%, in particular at least 8%, very particularly preferably at least 10%, and barely any or no vertical cracks, in particular no vertical cracks running right through, and the outermost ceramic layer has a layer thickness of not more than 40%, in particular not more than 20%, very particularly preferably not more than 10% of the layer thickness of the lower ceramic layer.

Dependencies are inferred from the claim text.