EFFECT OF TiAlCr COATING ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS

J Chin Soc Corr Pro

1998, Vol. 18

Issue (1): 35-40 DOI:

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EFFECT OF TiAlCr COATING ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS

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Abstract The effect of a sputtered Ti-50Al-10Cr coating on oxidation resistance of TiAl intermetallic compound was investigated in static air. The bare TiAl alloy exhibited poor isothermal and cyclic oxidation resistance at 800-1000℃ due to the formation of TiO2-based scales which tended to spall during cooling. The sputtered Ti-50Al-10Cr coating could remarkably improve the oxidation resistance of the TiAl alloy by means of the formation of adherent Al2O3 scale. After long-term oxidation (at 900℃ for 1000h), TiAlCr still provided an excellent protection for TiAl alloy and only a slight interdiffusion occurred as a result of the inward diffusion of Cr while no voids were found at the coating/substrate interface. The TiAlCr coating combined better oxidation resistance with its compatibility to substrate than any other conventional aluminide and MCrAlY coatings.

Key words: TiAl intermetallics Isothermal/cyclic oxidation TiAlCr coating

Received: 25 February 1998

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TANG Zhao-lin WANG Fu-hui WU Wei-tao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Young Scientists Lab of Surface Engineering; Chinese Academy of Sciences; Shenyang 110015). EFFECT OF TiAlCr COATING ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS. J Chin Soc Corr Pro, 1998, 18(1): 35-40.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I1/35

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[1]	TANG Zhaolin WANG Fuhui WU Weitao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). HOT CORROSION BEHAVIOR OF TiAl INTERMETALLICS IN MOLTEN SALTS[J]. 中国腐蚀与防护学报, 1997, 17(3): 233-237.
[2]	TANG Zhaolin WANG Fuhui WU Weitao(State Key Laboratory for Corrosion and Protection; Chinese Academy of Sciences; Shenyang 110015) (Young Scientists Laboratory of Surface Engineering; Institute of Corrosion and protection of Metals;Chinese Academy of Scie. EFFECT OF MCrAlY COATINGS ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS[J]. 中国腐蚀与防护学报, 1997, 17(2): 116-120.

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