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Effect of Phase Transformation Mechanism on the Microstructure of Cold-sprayed Ni/Al-Al2O3 Composite Coatings during Post-spray Annealing Treatment

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Abstract

NiAl-Al2O3 intermetallic-based composite coatings were prepared by cold spraying of Ni/Al-Al2O3 composite powders followed by post-spray annealing treatment. The phase transformation mechanism from Ni/Al mechanical alloy to intermetallic compounds and its influence on the microstructure were examined to aim at controlling the coating microstructure. Results show that with the porous Ni/Al and Ni/Al-Al2O3 green compacts, a self-propagating high-temperature synthesis (SHS) reaction is ignited at a temperature of 500-600 °C. However, a SHS reaction could not be ignited for the cold-sprayed dense Ni/Al and Ni/Al-Al2O3 alloy coatings with or without a substrate. The phase transformation from Ni/Al mechanical alloy to NiAl intermetallic compound during post-spray annealing evidently can be attributed to a diffusion mechanism. Compared to the quite porous structure of the composites resulting from SHS, the composite coatings via diffusion phase transformation during post-spray annealing treatment present a relatively dense microstructure with neither large pores nor micro-sized cracks.

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Acknowledgments

The present project was supported by the National Natural Science Foundation for the Distinguished Young Scholars of China (Grant No. 50725101) and the Program for New Century Excellent Talents in University (No. NCET-08-0443).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, People’s Republic of China

    Guan-Jun Yang, Su-Ning Zhao, Cheng-Xin Li & Chang-Jiu Li

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  1. Guan-Jun Yang
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  2. Su-Ning Zhao
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  3. Cheng-Xin Li
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Correspondence to Chang-Jiu Li.

Additional information

This article is an invited paper selected from presentations at the 2012 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2012: Proceedings of the International Thermal Spray Conference, Air, Land, Water, and the Human Body: Thermal Spray Science and Applications, Houston, Texas, USA, May 21-24, 2012, Basil R. Marple, Arvind Agarwal, Laura Filofteia-Toma, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and André McDonald, Ed., ASM International, Materials Park, OH, 2012.

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Yang, GJ., Zhao, SN., Li, CX. et al. Effect of Phase Transformation Mechanism on the Microstructure of Cold-sprayed Ni/Al-Al2O3 Composite Coatings during Post-spray Annealing Treatment. J Therm Spray Tech 22, 398–405 (2013). https://doi.org/10.1007/s11666-012-9857-8

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  • DOI: https://doi.org/10.1007/s11666-012-9857-8

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