Turbine engine abradable systems
AssigneeRtx Corporation
InventorsChristopher W. Strock, Kevin C Seymour
Life of this patent
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Abstract
A turbine engine has: a first member (22) having a surface bearing an abradable coating, the abradable coating (36) being at least 90% by weight ceramic; and a second member (24) having a surface bearing an abrasive coating. The abrasive coating (56) has a metallic matrix (64) and a ceramic oxide abrasive (66) held by the metallic matrix, the first member and second member mounted for relative rotation with the abrasive coating facing or contacting the abradable coating. At least 50% by weight of the ceramic abrasive has a melting point at least 400K higher than a melting point of at least 20% by weight of the ceramic of the abradable coating.
Claims20
A turbine engine comprising:
- a first member having a surface bearing an abradable coating, the abradable coating being at least 90% by weight ceramic;
- and
- a second member having a surface bearing an abrasive coating, the abrasive coating comprising a metallic matrix and an ceramic oxide abrasive held by the metallic matrix,
- the first member and second member mounted for relative rotation with the abrasive coating facing or contacting the abradable coating,
- wherein:
- at least 50% by weight of the ceramic oxide abrasive has a melting point at least 400K higher than a melting point of at least 20% by weight of the ceramic of the abradable coating;
- the at least 50% by weight of the ceramic oxide abrasive is chromium oxide;
- and
- the at least 20% by weight of the ceramic of the abradable coating is rutile titania.
A turbine engine comprising:
- a first member having a surface bearing an abradable coating, the abradable coating being at least 90% by weight ceramic;
- and
- a second member having a surface bearing an abrasive coating, the abrasive coating comprising a metallic matrix and an ceramic oxide abrasive held by the metallic matrix,
- the first member and second member mounted for relative rotation with the abrasive coating facing or contacting the abradable coating,
- wherein:
- at least 50% by weight of the ceramic oxide abrasive has a melting point at least 400K higher
- than a melting point of at least 20% by weight of the ceramic of the abradable coating;
- the at least 50% by weight of the ceramic oxide abrasive is zirconia-toughened alumina;
- and
- the at least 20% by weight of the ceramic of the abradable coating is enstatite.
Dependencies are inferred from the claim text.