EFFECT OF MCrAlY COATINGS ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS

J Chin Soc Corr Pro

1997, Vol. 17

Issue (2): 116-120 DOI:

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EFFECT OF MCrAlY COATINGS ON OXIDATION RESISTANCE OF TiAl INTERMETALLICS

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Abstract The effect of sputtered Co-30Cr-6Al-0.5Y and Ni-30Cr-6Al-0.5Y coatings on oxidation resistance of TiAl intermetallics was studied in static air at 900-1000℃. The uncoated TiAl alloys showed poor oxidation resistance due to the formation of porous mixed Al2O3+TiO2 scale. The CoCrAlY and NiCrAlY coatings could remarkably improve the oxidation resistance of TiAl due to the formation of protective Al2O3 layer. Two diffusion zones were formed with the inward diffusion of Co or Ni from coating into substrate. The outer diffusion layers were mainly composed of AlCo2Ti and AlNi2Ti ternary intermetallics respectively, which were hard and brittle. TiO2 appeared on the CoCrAlY and NiCrAlY coatings, which resulted in accelerated oxidation at 1000℃.

Key words: TiAl intermetallics Oxidation MCrAlY coating

Received: 25 April 1997

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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 Chin Soc Corr Pro, 1997, 17(2): 116-120.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I2/116

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