Outer airseal abradable rub strip
AssigneeUnited Technologies Corporation
InventorsXuan Liu, Christopher W. Strock, Russell A. Beers
Life of this patent
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Abstract
A blade outer airseal has a body comprising: an inner diameter (ID) surface; an outer diameter (OD) surface; a leading end; and a trailing end. The airseal body has a metallic substrate and a coating system atop the substrate along at least a portion of the inner diameter surface. At least over a first area of the inner diameter surface, the coating system comprises an abradable layer comprising a metallic matrix and a solid lubricant; and the metallic matrix comprises, by weight, ≥35% nickel, 12.0-20.0% cobalt, 5.0-15.0% aluminum, and 5.0-15.0% chromium.
Claims21
A blade outer airseal having:
- a body comprising:
- an inner diameter (ID) surface;
- an outer diameter (OD) surface;
- a leading end;
- a trailing end;
- a metallic substrate;
- and
- a coating system atop the substrate along at least a portion of the inner diameter surface,
- wherein:
- at least over a first area of the inner diameter surface, the coating system comprises an abradable layer comprising a metallic matrix and a solid lubricant;
- at 1200° F. the metallic matrix has at least 98% by volume fcc and L12 phases combined with at least 30% L12;
- and
- the metallic matrix comprises, by weight:
- ≥50% nickel;
- 12.0-20.0% cobalt;
- 5.0-15.0% aluminum;
- and
- 5.0-15.0% chromium.
A blade outer airseal having:
- a body comprising:
- an inner diameter (ID) surface;
- an outer diameter (OD) surface;
- a leading end;
- a trailing end;
- a metallic substrate;
- and
- a coating system atop the substrate along at least a portion of the inner diameter surface,
- wherein:
- at least over a first area of the inner diameter surface, the coating system comprises an abradable layer comprising a nickel-based metallic matrix and a solid lubricant;
- and
- at 1200° F. the metallic matrix has:
- at least 40% primary fcc;
- at least 40% by volume gamma prime (L12);
- and
- at most 10% by volume beta (B2) crystal structure.
Dependencies are inferred from the claim text.