| 摘要 |
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<o>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). <IMAGE> |
