Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1996-05-22
1998-07-14
Zirker, Daniel
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428402, 428325, 428331, C04B 35447, C04B 3578, F01D 1100, B32B 516
Patent
active
057801460
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 grammes per cubic centimetre. 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
Doleman Paul A.
Mason Stephen
Merrill Gary B.
Percival Michael J. L.
Rolls-Royce plc
Taltavull W. Warren
Zirker Daniel
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