Abstract
Ti-48Al specimens were coated with Al-21Ti-23Cr film by RF magnetron sputtering. Ti-48Al specimen coated at 200 W, 0.8 Pa and 573 K showed the best oxidation-resistant property in the isothermal oxidation test. Al-21Ti-23Cr film was amorphous after deposition, but crystallized and formed a protective AlzO, layer on the surface during oxidation. The oxidation behavior of the coated specimens has been investigated through isothermal oxidation tests at 1073 K, 1173 K and 1273 K for 100 h. The isothermal oxidation curves showed that the parabolic stage continued up to 100 h at all tested temperature ranges, and the excellent oxidation resistance is attributable to the formation of a protective AlzO3 layer on the surface of the Al-21Ti-23Cr film. After the oxidation test at 1273K, the matrix of the Al-21Ti-23Cr film had transformed into the 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 temperatures.
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