Ceramic faced outer air seal for gas turbine engines

Details Ceramic faced outer air seal for gas turbine engines Ceramic faced outer air seal for gas turbine engines

1979-06-27

1981-09-15

Powell, Jr., Everette A.

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Erodable or permanently deformable

277 962, F28D 1900

Patent

active

042894468

ABSTRACT:
A durable, outer air seal structure capable of long term, reliable service in a gas turbine engine environment is disclosed. Various construction details which enable the incorporation of high temperature tolerant ceramic materials into the outer air seal structure are developed. The structure is built around a porous, low modulus pad of metallic material which is disposed between the ceramic material and a substrate of solid metallic material. The ceramic material is applied to a preferred density at which the physical properties of modulus of elasticity (E), mean tensile strength (T), coefficient of thermal expansion (.alpha.) and thermal conductivity (K) impart good thermal shock resistance, erosion resistance and abradability characteristics to the seal structure.

REFERENCES:
patent: 3817719 (1974-06-01), Meriden
patent: 3879831 (1975-05-01), Rigney
patent: 3887201 (1975-06-01), Rao
patent: 3918925 (1975-11-01), McComas
patent: 3936656 (1976-02-01), Middleton
patent: 3975165 (1976-08-01), Elbert
patent: 4080204 (1978-03-01), Panzera
patent: 4093243 (1978-06-01), Kishida
patent: 4109031 (1978-08-01), Marscher

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