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US 2001/0054500 A1Published application
Titanium-based heat exchangers and methods of manufacture
AssigneeHoneywell International Inc.
InventorsDerek Raybould, Paul Chipko, Matthew J. Pohlman
Life of this patent
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Abstract
Oxidation protection of a titanium heat exchanger is provided by a titanium aluminide or solgel coating. The coating protects bare titanium and brazed surfaces of the heat exchanger.
Claims28
A method of fabricating a heat exchanger, the method comprising:
- forming a titanium heat exchanger core;
- and
- applying a protective coating to bare titanium and braze surfaces of the core, the coating being applied by applying an aluminum conversion layer to the core at a temperature below which aluminum does not appreciably react with titanium, and then heat treating the conversion layer so the aluminum oxidizes and interacts with the titanium to form titanium aluminide.
A method of fabricating a heat exchanger, the method comprising:
- forming a heat exchanger core;
- applying a solgel solution to the heat exchanger core, the solution having a viscosity of less than I centipoise, whereby a coating results;
- and
- sintering the coating at temperatures between about 300° C. to 650° C .
1 more element
A method of applying a coating to a titanium article, the method comprising:
- applying an aluminum conversion layer to the article by gaseous deposition, the layer deposited at a temperature below which aluminum does not appreciably react with titanium;
- and
- heat treating the conversion layer so the aluminum oxidizes and interacts with the titanium to form titanium aluminide.
A method of applying a coating to a titanium article, the method comprising:
- applying a solgel solution to the article, the solution having a viscosity of less than 1 centipoise, whereby a coating is formed on the article;
- and
- sintering the coating at temperatures between about 300° C. and 600° C.
A heat exchanger comprising:
- a core including titanium-based components that are bonded together by braze;
- and
- a protective coating on bare metal and braze surfaces of the core, the coating including a titanium aluminide conversion layer and an alumina top layer, the conversion layer having a thickness of at least 0.5 microns.
A heat exchanger comprising:
- a core including titanium-based components that are bonded together by braze, and
- a solgel coating on bare metal and braze surfaces of the core.
An article comprising:
- a titanium-based member;
- and
- a braze on the member;
- an outer unbrazed portion of the member being made of titanium aluminide;
- an outer portion of the braze being made of an aluminide.
2 more elements
An article comprising:
- a titanium-based substrate;
- a braze on the substrate;
- and
- a solgel coating over the substrate and the braze;
- the solgel coating being in direct contact with the substrate and the braze.
2 more elements
Dependencies are inferred from the claim text.