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Preparation of TiAl3-Al Composite Coating by Cold Spray and Its High Temperature Oxidation Behavior

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Abstract

A novel TiAl3-Al coating was prepared by cold spray for high temperature protection of titanium aluminum-based alloy. The substrate alloy was orthorhombic-Ti-22Al-26Nb (at.%). The composite coating was mainly composed of TiAl3 embedded in the matrix of residual aluminum. An interlayer about 10 μm was formed between the coating and the substrate. The oxidation test indicated that this composite coating was very effective in improving the high-temperature oxidation resistance of the substrate alloy at 950 °C in the tested 150 cycles without any sign of degradation. The microstructure analysis of the oxidized composite coating showed that an Al2O3 scale with a complex structure can be formed outside the interlayer during oxidation and no oxides beneath the interlayer were detected, which indicated that the complex continuous Al2O3 and the interlayer provide the protection of the substrate at high-temperature oxidation condition.

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Acknowledgment

The financial support of National Natural Science Foundation of China (No. 50971127) is gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory for Corrosion & Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    L. Y. Kong, L. Shen, B. Lu, R. Yang, X. Y. Cui, T. F. Li & T. Y. Xiong

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  1. L. Y. Kong
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  2. L. Shen
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  3. B. Lu
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  4. R. Yang
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  5. X. Y. Cui
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  6. T. F. Li
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  7. T. Y. Xiong
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Correspondence to T. Y. Xiong.

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Kong, L.Y., Shen, L., Lu, B. et al. Preparation of TiAl3-Al Composite Coating by Cold Spray and Its High Temperature Oxidation Behavior. J Therm Spray Tech 19, 1206–1210 (2010). https://doi.org/10.1007/s11666-010-9516-x

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  • DOI: https://doi.org/10.1007/s11666-010-9516-x

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