Abradable composition, a method of manufacturing an abradable co

Coating processes – With post-treatment of coating or coating material – Heating or drying

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4273766, 428325, 428328, 428331, 428402, C04B 35447, C04B 3578, F01D 1100, B32B 516

Patent

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059620765

ABSTRACT:
An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the range of 800 to 1400 microns. The weight proportion of hollow aluminosilicate spheres in the abradable seal is 30% to 50%. The density of the abradable seal is 1.5 grams per cubic centimeter. The hollow aluminosilicate spheres in the aluminium phosphate matrix have a relatively high temperature capability of approximately 1300.degree. C. maximum. This makes the abradable seal better able to withstand the environment in the turbine of a turbofan gas turbine engine.

REFERENCES:
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patent: 4423097 (1983-12-01), Mons et al.
patent: 4440865 (1984-04-01), Salazar
patent: 4639388 (1987-01-01), Ainsworth et al.
patent: 5204289 (1993-04-01), Moh
patent: 5780146 (1998-07-01), Mason et al.

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