An Al plus Y coating process for improvement of the high-temperature oxidation resistance of a TiAl alloy
SCIE
SCOPUS
- Title
- An Al plus Y coating process for improvement of the high-temperature oxidation resistance of a TiAl alloy
- Authors
- Jung, HG; Wee, DM; Oh, MH; Kim, KY
- Date Issued
- 2001-04
- Publisher
- KLUWER ACADEMIC/PLENUM PUBL
- Abstract
- An Al + Y codeposition by a single EB-PVD process has been developed to improve the high-temperature oxidation resistance of a TiAl alloy. The Al + Y codeposited TiAl alloy with various ratios of Al and Y evaporation sources was evaluated by isothermal and cyclic-oxidation tests. The coating layer has a composition gradient because of the difference in vapor pressure between Y and Al. The oxidation resistance can be extensively improved by the formation of an Al + Y codeposition layer and it depends on the ratio of the source material of Al and Y. The best oxidation resistance was obtained from the Al + Y codeposited TiAl alloy with a ratio of Al:2Y. With the proper ratio of Al. Y, the Al + Y codeposition coating forms Two layers of the oxides during high-temperature oxidation + the outer (Y, Al) O layer and the inner Al2O3 layer, containing small amounts of Y oxide. These oxide layers, which have a fine grain size, act as a diffusion barrier, thus suppressing the rate of inward diffusion of O and may readily relieve thermal stresses.
- Keywords
- TiAl alloy; Al plus Y codeposition; oxidation resistance; (Y, Al)O mixed oxide; diffusion barrier; BEHAVIOR; DIFFUSION; ADDITIONS; PACK
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19570
- DOI
- 10.1023/A:1010399825117
- ISSN
- 0030-770X
- Article Type
- Article
- Citation
- OXIDATION OF METALS, vol. 55, no. 3-3, page. 189 - 208, 2001-04
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.