| DEPOSITION OF ALUMINIDE AND CHROMIUM-MODIFIED ALUMINIDE COATINGS ON TiAl ALLOYS USING THE HALIDE-ACTIVATED PACK CEMENTATION METHOD |
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| 作者姓名： | 周春根 徐惠彬 |
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| 作者单位： | Zhou Chungen 1，S.R.Zohai 1，Xu Huibin 1，Kyoo Young Kim 2 1(Department of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing，100083，China |
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| 摘 要： | ＦｕｒｔｈｅｒａｄｖａｎｃｅｓｉｎａｅｒｏｓｐａｃｅｔｅｃｈｎｏｌｏｇｉｅｓｄｅｍａｎｄｍａｔｅｒｉａｌｓｗｉｔｈｈｉｇｈｅｒｕｓｅｔｅｍｐｅｒａｔｕｒｅｓａｎｄｌｏｗｅｒｄｅｎｓｉｔｙｔｈａｎｔｈｅｃｕｒｅｎｔｌｙｕｓｅｄＮｉ－ｂａｓｅｓｕｐｅｒａ...
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Deposition of aluminide and chromium-modified aluminide coatings on TiAl alloys using the halide-activated pack cementation method |
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| Zhou Chungen,S.R.Zohai,Xu Huibin,Kyoo Young Kim.DEPOSITION OF ALUMINIDE AND CHROMIUM-MODIFIED ALUMINIDE COATINGS ON TiAl ALLOYS USING THE HALIDE-ACTIVATED PACK CEMENTATION METHOD[J].Chinese Journal of Aeronautics,1999,12(1). |
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| Authors: | Zhou Chungen SRZohai Xu Huibin Kyoo Young Kim |
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| Abstract: | The halide activated pack cementation method is utilized to deposit aluminide and chromium modified aluminide coatings on TiAl alloys. Emphasis is placed on the effect of alloying elements on the aluminizing kinetics as well as on the study of formation of chromium modified aluminide coating. The addition of a small amount of Nb and Cr in the TiAl improves significantly the aluminizing kinetics of TiAl alloys by increasing the reaction rate of active Al atoms with substrate through grain refinement as well as by increasing the solid state diffusion of Al through the formation of stable TiAl 3 layer. Cr and Al are simultaneously co deposited by diffusion into K 5 alloy, by a single step, pack cementation process. The morphologies of the coating formed on K 5 substrate, i.e., an external layer with L1 2 structure and an underlying interdiffusion zone, are presented. The mechanism for the formation of Cr modified aluminide coating is discussed. |
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| Keywords: | aluminide TiAl pack cementation |
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