Dysprosia stabilized zirconia abradable

US7981530B2 · kind B2 · utility

Assignee

• Sulzer Metco (US) Inc. · US

Inventors

• Dieter Rudolf Sporer · Vils, AT
• Ulrike Taeck · Auenstein, CH
• Mitchell R. Dorfman · Smithtown, US
• Andrew R. Nicoll · Oftersheim, DE
• Massimo Giannozzi · Firenze, IT
• Iacopo Giovannetti · Firenze, IT

Key dates

• Filing date: Jun 7, 2007
• Grant date: Jul 19, 2011
• Expiry date: Nov 7, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Ceramic abradable materials, in particular thermally sprayable ceramic abradable powder materials, and abradable seals formed by thermally spraying the materials include dysprosia (Dy2O3) and zirconia (ZrO2). Coatings are porous whereby the porosity, in part, is induced by plastic or fugitive phases. Abradable seal coatings comprising dysprosia and zirconia exhibit improved thermal shock and sintering resistance and can be worn into tolerance by untreated, bare turbine blades, at least in certain regimes of relative blade speed and coating porosity. Ceramic abradable seal coatings comprising dysprosia and zirconia can be used up to 1200° C.