Method for coating heat resistant alloys
Abstract
Abstract THE SUBSTRATE OF A HEAT RESISTANT ALLOY IS COATED BY PACK CEMENTATION WITH AN OXIDATION RESISTANT COATING METAL WHILE SUBSTANTIALLY AVOIDING THE FORMATION OF AN INTERNALLY OXIDIZED STRUCTURE WITHIN THE COATING WHICH COMPRISES, EMBEDDING A HEAT RESISTANT ALLOY ARTICLE TO BE COATED IN A CEMENTATION PACK COMPRISING SAID COATING METAL (E.G. CHROMIUM WHICH HAS A LOVER PROPENSITY TO OXIDIZE THAN AN OXIDATION RESISTANT SOLUTE METAL IN THE ALLOY (E.G. ALUMINUM), AND THEN SUBJETING THE ALLOY ARTICLE TO PACK CEMENTATION AT AN ELEVATED TEMPERATURE WHILE MAINTAINING THE OXYGEN IN THE PACK AT A PARTIAL PRESSURE BELOW THE OXYGEN THRESHOLD LEVEL AT WHICH THE ALLOY IS SUBJECT TO INTERNAL OXIDATION.
Inventors
- 👤 Harry W Brill-Edwards
Bibliographic Details
Claims Analysis
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