C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/34 (2006.01) B28B 11/24 (2006.01) B32B 18/00 (2006.01) C04B 20/00 (2006.01) C04B 35/447 (2006.01) C04B 35/78 (2006.01) F01D 11/12 (2006.01) F02C 7/28 (2006.01)
Patent
CA 2177657
An abradable seal (46) comprises a plurality of hollow aluminosilicate spheres spheres (48) in a matrix of aluminium phosphate (50). The matrix of aluminium phosphate (50) also has an aluminosilicate filler. The hollow aluminosilicate spheres (48) 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 (48) in the abradable seal (46) is 30% to 50%. The density of the abradable seal (46) is 1.5 grammes per cubic centimetre. The hollow aluminosilicate spheres (48) in the aluminium phosphate matrix (50) have a relatively high temperature capability of approximately 1300°C maximum. This makes the abradable seal (46) better able to withstand the environment in the turbine (30) of a turbofan gas turbine engine (10).
Doleman Paul Andrew
Mason Stephen
Merrill Gary Brian
Percival Michael John Lawrence
Gowling Lafleur Henderson Llp
Rolls-Royce Plc
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