Plasma sprayed abradable seals for gas turbine engines

Details Plasma sprayed abradable seals for gas turbine engines Plasma sprayed abradable seals for gas turbine engines

1993-10-29

1996-07-16

Cummings, Scott W.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277DIG6, 4151734, 4151744, 428613, 428680, 428937, F16J 15453

Patent

active

055360220

ABSTRACT:
A gas turbine abradable seal is prepared by plasma spraying an oxidation resistant metallic material and boron nitride. The resultant structure comprises a metallic matrix encompassing a lubricating amount of boron nitride, with porosity of less than about 15 percent and a fabricated surface roughness of less than about 600 microinches. The reduced surface roughness and substantially reduced permeability of this seal provide substantially enhanced engine efficiency, and improved durability.

REFERENCES:
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patent: 4039296 (1977-08-01), Levinstein
patent: 4664973 (1987-05-01), Otfinoski et al.
patent: 4696855 (1987-09-01), Petit, Jr.
patent: 4936745 (1990-06-01), Vine et al.
patent: 5024884 (1991-06-01), Otfinoski
patent: 5122182 (1992-06-01), Dorfman et al.

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