Method for applying an aluminum diffusion coating to a component of titanium alloy
AssigneeMTU Motoren- und Turbinen-Union Muenchen GmbH
InventorsRichard Grunke, Lothar Piechl
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Abstract
Aluminum diffusion coatings are applied to structural components of titanium alloys by two separate heat treatment steps applied to the component embedded in an aluminum powder. The first heat treatment step is performed at relatively very low temperatures for avoiding an oxygen embrittlement of the structural component by any remainder oxygen. The subsequent diffusion heat treatment is performed at higher temperatures. If desired, a getter material having a high oxygen affinity, is added to the powder mixture in which the structural components are embedded for the first treatment. The getter material binds any remainder oxygen.
Claims11
A method for applying an aluminum diffusion coating to a titanium alloy component, comprising the following steps:
- (a) preparing an aluminum containing powder and embedding said titanium alloy component in said aluminum containing powder,
- (b) heating said component and said aluminum containing powder in a first heat treatment step to a first temperature within the range of about 400.degree. C. to about 625.degree. C. for a time duration sufficient to form an aluminum coating having a high aluminum content on said titanium alloy component and so that said coating attains a thickness of less than about 35 .mu.m, and
- (c) performing a second heat treatment step for diffusion annealing said titanium alloy component with its aluminum coating, at a temperature within the range of about 625.degree. C. to about 1400.degree. C. for providing a gradual transition between said aluminum coating and said titanium alloy component.
Dependencies are inferred from the claim text.