Preparation of AI-21Ti-23Cr High Temperature Protective Coating for TiAo Intermatallic Compounds by RF Magnetron Sputtering

RF Magnetron Sputtering에 의한 금속간화합물 TiAI 모재위의 AI-21Ti-23Cr 고온내산화코팅

  • 박상욱 (한국과학기술원 재료공학과) ;
  • 박정용 (한국과학기술원 재료공학과) ;
  • 이호년 (한국과학기술원 재료공학과) ;
  • 오명훈 (금오공과대학교 재료공학과) ;
  • 위당문 (한국과학기술원 재료공학과)
  • Published : 1996.07.01

Abstract

Ti-48Al(at.%) specimens were coated with Al-21Ti-23Cr(at.%) film by RF magnetron sputtering. Ti-48Al specimen coated at 200, 0.8Pa and 573K showed the best oxidation resistance property in the isothermal oxidation test. Al-21Ti-23Cr film was amophous after depostion, but crystallized and fromed a protective ${Al}_{2}{O}_{3}$ layer on the surface during oxidation. Ti-48Al specimens coated at 573K have been sassessed by isothermal oxidation test for 100 hours at 1073K, 1173K and 1273K. The mass gain curves showed that parabolic stage continued at al tested temperature range in isothermal oxidation test, and the excellent oxidation resistance is attriutable to the formation of a protective ${Al}_{2}{O}_{3}$ layer on the surface of Al-21Ti-23Cr film. After oxidation test at 1273K, the matrix of Al-21Ti-23Cr film had transformed into TiAlCr phase due to the depletion of Al during oxidation and the diffusion of Ti from the substrate, and the extent of mass gain of the specimen increased compared with that of specimens tested at lower temperature.

Keywords

References

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