Rolls-royce Corporation

William B Litchfield

John T Gent

James A Graham

Kenneth W Wright

An abradable seal coating for application to one of a pair of members having relative rotational movement and its method of manufacture are described. The abradable seal coating comprises a two phase composition consisting of a first phase of a metallic alloy matrix of approximately 88% aluminium - 12% silicon, and a second phase of an organic dispersoid material. The first and second phases are codeposited onto a substrate in the ratio 80:20 respectively. The two phases are modified after codisposition onto the substrate by heat treating at a temperature of 450.degree. C. for about sixteen hours. The heat treated coating can be used at elevated temperatures and has improved abradability whilst maintaining its integrity.

Abradable seal coating and method of making the same

A powder suitable for flame spraying which is a composition of an admixture of particles, 20-40% by volume of the particles being an alloy such as a nickel base alloy or cobalt base alloy, each containing aluminium and chromium and the balance of the composition are hollow glass particles, each hollow glass particle being coated with a nickel base alloy or cobalt base alloy, each containing aluminium and chromium. The powder, when flame sprayed, is effective as a thermal barrier which is resistant to thermal shock and oxidation.

Coating material

A powder suitable for flame spraying comprising particles of an alumino silicate glass, each of the particles being hollow and coated with an alloy containing, by weight, 80% nickel, 2.5% aluminium, 15.7% chromium and 1.8% silicon. The resultant coating is particularly suitable for use as a thermal barrier.

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Toton, United Kingdom

William B Litchfield