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US 8,770,926 B2Granted
Rough dense ceramic sealing surface in turbomachines
AssigneeUnited Technologies Corporation
InventorsChangsheng Guo, Christopher W. Strock, Thomas W. Stowe, Paul W. Baumann
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Abstract
An abrasive coating is formed on a rotor shaft that rotates with respect to cantilevered vanes. The coating is formed by thermal spray techniques and comprises a ceramic layer on a metal bond coat. The coating surface is roughened by crush grinding or by grit blasting to increase the abradability of the surface.
Claims19
A method of conditioning a dense ceramic coating to form an abrasive seal comprising:
- forming a part with a surface;
- depositing a bond coat on the surface;
- depositing a ceramic coating on the bond coat;
- grinding the ceramic surface to a surface finish of 20 to 30 microinches (0.51 microns to 0.76 microns);
- and
- roughening the ceramic surface to a roughness from about 100 Ra in microinches to about 300 Ra (2540 Ra to 7620 Ra in microns) to form an abrasive seal.
3 more elements
An abrasive coating for a rotor that moves relative to cantilevered vanes, the coating comprising:
- a metal bond coat layer on the rotor shaft;
- a ceramic layer on the metal bond coat layer providing thermal insulation of the rotor;
- and
- a roughened surface on the ceramic layer for abrading bare vane tips that contact the rotor during operation with a roughness of from about 100 Ra to about 300 Ra in microinches (2540 Ra to 7620 Ra in microns).
1 more element
A compressor for a gas turbine engine comprising:
- a rotor having a plurality of blades extending radially outward from the rotor;
- a plurality of cantilevered vanes between the rotor blades and extending radially inward toward the rotor;
- and
- a coating on the portion of the rotor facing bare vane tips of the vanes, the coating including a metal bond coat layer on the outer surface, a ceramic layer over the bond layer, and an abrasive surface on the ceramic layer with a surface roughness of from about 100 Ra to about 300 Ra in microinches (2540 Ra to 7620 Ra in microns), whereby the ceramic layer provides insulation of the rotor shaft during operation and abrades the bare vane tips during rub interaction events.
1 more element
Dependencies are inferred from the claim text.