발간논문

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Vol.31, No.3, 356 ~ 360, 1993
Title
Process Development of a Multilayer Coating of Pack Aluminizing and Yttrium - Ion Plating for High Temperature Applications
전재호J . H . Jun, 김규영K . Y . Kim
Abstract
A coating process for a multilayer coating of aluminide and yttrium was developed for high temperature applications. Aluminide coating was carried out by pack cementation method, while yttrium was incorporated by an ion plating method. Various combinations of pack alumininzing and yttrium (Y) ion plating were examined with respect to coating sequence, aluminum activity, and corrosion environment. The best corrosion resistance for high temperature hot corrosion was obtained from a multilayer coating of H/A＋Y(high activity aluminizing＋Y-ion plating) type. Uniformity of the Y deposition was greatly dependent upon the surface condition of the aluminide coating layer. The high activity aluminide coating gave better uniformity of Y deposition than did the low activity aluminide coating. Improvement of corrosion resistance by the Y-modified aluminide multilayer coatings of H/A＋Y type was attributed to the fact that presence of Y along the Al₂O₃columnar grain boundaries prohibits substantially depletion of Al contained in the aluminide coating layer. The consistent and prolonged supply of Al thus improves the Al₂O₃scale adherence and stability.
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