Fluid-flow machine i.e. axial-flow gas turbine, has abradable abrasion layer arranged at blade tip adjacent to radial inner side of housing and made of specific mass percent of zirconium oxide stabilized ytterbium oxide

摘要

The machine has a moving blade (1) arranged in a housing (12), where a radial clearance (10) is formed between a blade tip (5) and a radial inner side (11) of the housing. An abradable blade tip coating (8) is formed at the blade tip of the moving blade and made of 2-12 mass percent of zirconium (IV) oxide stabilized yttrium (III) oxide. An abradable abrasion layer (7) is arranged at the blade tip adjacent to the radial inner side of the housing and made of 20-50 mass percent of zirconium (IV) oxide stabilized ytterbium (III) oxide.