Abradable shroud assembly for turbomachinery

Details Abradable shroud assembly for turbomachinery Abradable shroud assembly for turbomachinery

1996-09-23

1997-11-04

Evans, Elizabeth

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428232, 428246, 428294, 428913, 428929, 252511, B32B 300

Patent

active

056837895

ABSTRACT:
A bonded assembly which includes a heating element in thermal contact with the adhesive component of the bonded assembly, such that the heating element can serve to thermally degrade the adhesive so as to allow disassembly, repair and servicing of the bonded assembly. The invention is particular suited for use in an abradable shroud assembly used in the fan section of a turbomachine, such as a high bypass turbofan engine. The abradable shroud assembly includes an abradable material bonded to the fan casing with an adhesive material having a known thermal degradation temperature. Placed in thermal contact with the adhesive layer is a heating element, such that the heating element is capable of heating the adhesive to a temperature above its thermal degradation temperature. As such, the adhesive can be heated with the heating element to a temperature sufficient to thermally degrade the adhesive, and thereby permit removal of the abrasive material without first requiring disassembly the engine and without the use of powered machine tools to forcibly remove the abradable material.

REFERENCES:
patent: 3825371 (1974-07-01), Roder et al.
patent: 3843278 (1974-10-01), Torell
patent: 4460185 (1984-07-01), Grandey
patent: 5240645 (1993-08-01), Strecker
patent: 5264059 (1993-11-01), Jacaruso

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