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Al-21Ti-23Cr High-Temperature Protective Coating on TiAl Intermetallic Compounds by RF Magnetron Sputtering

Published online by Cambridge University Press:  15 February 2011

J. Y. Park ,
H. N. Lee ,
S. W. Park ,
M. H. Oh  and
D. M. Wee
J. Y. Park
Affiliation:
Dept. of Matls. Sci. and Eng., KAIST, Taejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
H. N. Lee
Affiliation:
Dept. of Matls. Sci. and Eng., KAIST, Taejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
S. W. Park
Affiliation:
Dept. of Matls. Sci. and Eng., KAIST, Taejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
M. H. Oh
Affiliation:
Dept. of Matls. Sci. and Eng., KAIST, Taejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
D. M. Wee
Affiliation:
Dept. of Matls. Sci. and Eng., KAIST, Taejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
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Abstract

Ti-48A1 specimens were coated with Al-21Ti-23Cr film at 200 W, 0.8 Pa and 573 K by RF magnetron sputtering. The oxidation behavior of the coated specimens was investigated through isothermal and cyclic oxidation tests, and the tensile deformation properties of the coated specimens were also investigated before and after oxidation. The isothermal and cyclic oxidation curves showed that the Al-21Ti-23Cr film was very effective in decreasing the oxidation rate of Ti-48A1. This excellent oxidation resistance is attributable to the formation of a protective Al2O3 layer on the surface of the Al-21Ti-23Cr film. It was found from the results of the tensile test that the protective Al2O3 layer on the surface of the Al-21Ti-23Cr film enabled the Ti-48A1 to maintain its tensile properties in an oxidizing environment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 165
Copyright
Copyright © Materials Research Society 1997

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References

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