Process for making abradable hybrid ceramic wall structures

Details Process for making abradable hybrid ceramic wall structures Process for making abradable hybrid ceramic wall structures

1991-02-07

1992-01-14

Zimmerman, John J.

Coating processes

Nonuniform coating

Deforming the base or coating or removing a portion of the...

427 34, 427405, 4274192, 427423, F01D 1108, B32B 312, B05D 110

Patent

active

050809342

ABSTRACT:
Abradable wall structures for high temperature applications, such as in turbine housings and the like. The wall structures comprise a superalloy metal base plate supporting a superalloy metallic cellular structure, the cells of which are filled to a substantial extent with at least one ceramic core material providing high heat resistance, oxygen barrier and low thermal expansion properties. The invention involves the application of a porous or pore-forming surface composition to provide a corrosion-resistant, erosion-resistant abradable outer surface layer, the softness or porosity of which can be tailored to improve the abradability of the wall structure, while imparting oxidation-, corrosion- and erosion-resistance to the structure. The surface layer composition may comprise metal superalloy, ceramic or cermet base compositions containing fugitive or retained inert filler materials.

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