Method of repairing a damaged abradable coating
First Claim
1. A method of repairing a damaged abradable coating on a surface in an assembled engine without removing a module of the engine from the engine, the method comprising:
- (a) inserting a boroscope through an aperture in a casing of the assembled engine, the boroscope carrying a conduit,(b) directing the boroscope to the damaged abradable coating on the surface,(c) supplying a liquid abradable glue through the conduit, and(d) directing the liquid abradable glue onto the surface in the assembled engine to repair the damaged abradable coating,wherein the liquid abradable glue consists of silica powder, sodium silicate and a dislocator, the dislocator being selected from the group consisting of polyester, graphite and hexagonal boron nitride.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of repairing a damaged abradable coating (48) on a surface (46) of a shroud (44) in an assembled gas turbine engine (10) comprises inserting a boroscope (60) through an aperture (52) in the casing (50) of the compressor (26) of the gas turbine engine (10). The boroscope (60) is arranged to carry a conduit (62). The boroscope (60) and hence the conduit (62) are directed to the damaged abradable coating (48) on the surface (46) of the shroud (44). A liquid abradable glue (64) is supplied through the conduit (62) and the liquid abradable glue (64) is directed onto the surface (46) of the shroud (44) in the compressor (26) of the gas turbine engine (10) to repair the damaged abradable coating (48).
38 Citations
15 Claims
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1. A method of repairing a damaged abradable coating on a surface in an assembled engine without removing a module of the engine from the engine, the method comprising:
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(a) inserting a boroscope through an aperture in a casing of the assembled engine, the boroscope carrying a conduit, (b) directing the boroscope to the damaged abradable coating on the surface, (c) supplying a liquid abradable glue through the conduit, and (d) directing the liquid abradable glue onto the surface in the assembled engine to repair the damaged abradable coating, wherein the liquid abradable glue consists of silica powder, sodium silicate and a dislocator, the dislocator being selected from the group consisting of polyester, graphite and hexagonal boron nitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of repairing a damaged abradable coating on a surface in an assembled gas turbine engine on an aircraft without removing a module of the gas turbine engine from the aircraft, the method comprising:
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inserting a boroscope through an aperture in a casing of the assembled gas turbine engine, the boroscope carrying a conduit; directing the boroscope to the damaged abradable coating on the surface; supplying a liquid abradable glue through the conduit; and directing the liquid abradable glue onto the surface in the assembled gas turbine engine to repair the damaged abradable coating, wherein the liquid abradable glue consists of silica powder, sodium silicate and a dislocator, the dislocator being selected from the group consisting of polyester, graphite, and hexagonal boron nitride, and the surface being selected from the group consisting of a radially inner surface of a compressor stator component positioned radially around a stage of compressor rotor blades and a radially inner surface of a turbine stator component positioned radially around a stage of turbine rotor blades.
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Specification