Sulzer Metco (us) Inc.

Andrew R Nicoll

Mitchell R Dorfman

Iacopo Giovannetti

Massimo Giannozzi

Scott Wilson

Dieter R Sporer

Ulrike Taeck

Ceramic abradable materials, in particular thermally sprayable ceramic abradable powder materials, and abradable seals formed by thermally spraying the materials include dysprosia (DyO) and zirconia (ZrO). 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&#xb0; C.

Dysprosia stabilized zirconia abradable

A ceramic abradable material is provided for use for clearance control between turbine blade tips and the shroud or casing in gas turbine engines for industrial and/or aerospace applications. The ceramic abradable material includes an yttria stabilized zirconia (YSZ) that is doped in alumina (AlO). The ceramic abradable in accordance with the invention is a soft abradable material that provides for increased erosion resistance as well as the ability of the turbine blade tips to cut into the abradable without causing them damage. These properties allow for optimum tolerances within the gas turbine engine which results in superior efficiency and performance.

Ceramic abradable material with alumina dopant

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Wohlen, Switzerland

Andrew R Nicoll