Aluminum-chromium diffusion coating
AssigneeRaytheon Technologies Corporation
InventorsMichael N. Task, Xuan Liu
Life of this patent
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Abstract
A process includes applying a slurry to a surface of a metallic article to produce a slurry film on the surface. The slurry is composed of a liquid carrier, chromium and aluminum, and an agent that is reactive with the chromium and aluminum to form intermediary compounds. The article and slurry film are then thermally treated at an activation temperature at which the agent reacts with the chromium and aluminum to form the intermediary compounds. The intermediary compounds deposit the chromium and aluminum on the surface. The thermal treating also diffuses the chromium and aluminum into a sub-surface region of the article such that the sub-surface region becomes enriched with chromium and aluminum.
Claims8
A process comprising:
- applying a slurry to a surface of a metallic article to produce a slurry film on the surface, where the slurry is composed of,
- a liquid carrier,
- chromium and aluminum in the form of chromium-aluminum alloy particles that have a composition, by weight, of 5% to 10% aluminum and 95% to 90% chromium, and
- an agent that is reactive with the chromium and aluminum to form intermediary compounds, wherein the agent is a halide selected from the group consisting of ammonium chloride, chromium chloride, ammonium fluoride, and combinations thereof;
- and
- thermal treating the article and slurry film at an activation temperature at which the agent reacts with the chromium and aluminum to form the intermediary compounds, the intermediary compounds depositing the chromium and aluminum on the surface, the thermal treating also diffusing the chromium and aluminum into a sub-surface region of the article such that the sub-surface region becomes enriched with chromium and aluminum.
Dependencies are inferred from the claim text.