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- W2150185621 abstract "The degree of protection from high‐temperature oxidation which can be imparted to columbium by ten different types of coatings was evaluated. The coatings were applied by Plasmarc, detonation gun, or gun‐metallizing processes. Although chromium, stainless steel, and Nichrome protected columbium from gross oxidation in the temperature range of 950°–1150°C for hundreds of hours, chromium coatings allowed oxygen contamination of the columbium to occur as low as 950°C. A coating of LM‐5 (Mo‐Si‐Cr‐B‐Al) prevented all reaction for about 1000 hr at 1150°C and 100 hr at 1500°C. The LM‐5 coating behaved well under stress and exhibited some self‐healing properties and thermal shock resistance. The latter two properties can be increased even further by introducing an alloy layer of the Cb‐Ti‐Cr‐Al‐Ni type between the LM‐5 and the columbium article. This duplex coating retained the static exposure resistance and strain‐rate insensitivity of the LM‐5, while being able to with‐stand 30 water‐quenches from 1150°C before failure. These results indicate that satisfactory protection can be obtained for very simple columbium shapes. The coating of shapes large and complex enough to represent a commercially significant component is still an unsolved problem." @default.
- W2150185621 created "2016-06-24" @default.
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- W2150185621 date "1961-01-01" @default.
- W2150185621 modified "2023-09-27" @default.
- W2150185621 title "Coatings for Columbium" @default.
- W2150185621 doi "https://doi.org/10.1149/1.2428037" @default.
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