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PHASE AND MORPHOLOGY TRANSFORMATION OF Al_2O_3 DURING OXIDATION OF SPUTTERED NiCrAlY COATINGS

Meiheng Li

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Abstract

The isothermal oxidation of sputtered NiCrAlY coatings was performed in air at 900℃,1000℃ and 1100℃.Transient alumina θ-Al 2O 3,with fast growing rate,was formed on the surface of the coatings in the initial stage of oxidation.With oxidation time increasing,θ-Al 2O 3 transformed into α-Al 2O 3,and hence the parabolic rate constant decreased.The higher the temperature,the faster the transformation of θ-Al 2O 3 into α-Al 2O 3.A pre-heat treatment of the sputtered NiCrAlY coatings in vacuum can accelerate the transformation of θ-Al 2O 3 into α-Al 2O 3,and there with the protective α-Al 2O 3 scale is formed more rapidly on the surface of the coatings.

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What this paper is about

The isothermal oxidation of sputtered NiCrAlY coatings was performed in air at 900℃,1000℃ and 1100℃.Transient alumina θ-Al 2O 3,with fast growing rate,was formed on the surface of the coatings in the initial stage of oxidation.With oxidation time increasing,θ-Al 2O 3 transformed into α-Al 2O 3,and hence the parabolic rate constant decreased.The higher the temperature,the faster the transformation of θ-Al 2O 3 into α-Al 2O 3.A pre-heat treatment of the sputtered NiCrAlY coatings in vacuum can accelerate the transformation of θ-Al 2O 3 into α-Al 2O 3,and there with the protective α-Al 2O 3 scale is formed more rapidly on the surface of the coatings.

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Available abstract

The isothermal oxidation of sputtered NiCrAlY coatings was performed in air at 900℃,1000℃ and 1100℃.Transient alumina θ-Al 2O 3,with fast growing rate,was formed on the surface of the coatings in the initial stage of oxidation.With oxidation time increasing,θ-Al 2O 3 transformed into α-Al 2O 3,and hence the parabolic rate constant decreased.The higher the temperature,the faster the transformation of θ-Al 2O 3 into α-Al 2O 3.A pre-heat treatment of the sputtered NiCrAlY coatings in vacuum can accelerate the transformation of θ-Al 2O 3 into α-Al 2O 3,and there with the protective α-Al 2O 3 scale is formed more rapidly on the surface of the coatings.

Key concepts: Isothermal process, Materials science, Metallurgy, Morphology (biology), Phase (matter), Transformation (genetics), Chemical engineering, Thermodynamics

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PHASE AND MORPHOLOGY TRANSFORMATION OF Al_2O_3 DURING OXIDATION OF SPUTTERED NiCrAlY COATINGS — Research Paper | ScholarLens