Study on Kinetics of High Temperature Oxidation of γ-TiAl Alloy Bearing Al_2O_3 Coating AITranslate

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Chinese Library Classification Number:TG178.2[金属学及工艺—金属表面处理]

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Al2O3 coating was prepared on the surface of γ-TiAl alloy by sol-gel method, and the high tem- perature oxidation kinetics of the alloy substrate and the coated sample was researched by isothermal oxi- dation experiment. The algorithm of the kinetic equation was derived, and the thermal stress between oxide film and substrate was estimated. The results show that the kinetics of the blank sample follows the cubic law in the preceding period of high temperature oxidation, but then follows the linear law. However,high temperature oxidation kinetics of the coated sample follows the linear law first and then the parabolic law. The oxidation rate constant of Al2O3 coated sample decreases by nearly 90% compared with the blank con- trol sample. Al2O3 coating can improve cyclic oxidation resistance of the alloy by reducing the thermal stress between oxide film and substrate.