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US 2025/0304500 A1Published application
Turbine Engine Abradable Systems
AssigneeRtx Corporation
InventorsChristopher W. Strock, Kevin C. Seymour
Life of this patent
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Abstract
In a method for forming an abradable material (36), the abradable material has at least 20% by volume rutile titania (44) and hBN (46). The method includes: blending a first titania powder having an oxygen debit of at least 5.0% with a second titania powder having an oxygen debit, if any, of less than 1.0%. The blend is thermal sprayed. The sprayed blend is then oxidized.
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 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.
2 more elements
A method of coating a substrate with an abradable coating, the method comprising:
- blending powders and thermal spraying the blend;
- or
- co-thermal spraying, the co-thermal spraying forming a blend of the powders.
- wherein the blend comprises:
- at least 20% by volume mullite;
- and
- at least 35% by volume Magnéli phase titanium oxide.
4 more elements
Dependencies are inferred from the claim text.