Alloying of cold-sprayed Al-Ni composite coatings by post-annealing |
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Authors: | Ha Yong Lee Se Hun Jung Soo Yong Lee Kyung Hyun Ko |
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Institution: | Department of Materials Science and Engineering, Ajou University, Suwon 443-749, Republic of Korea |
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Abstract: | A new cold spray coating technique for thick Al coating with finely dispersed Al-Ni intermetallic compounds was tested. For easy powder preparation and high yield, rather than using of Al/compound mixture feed stock, the spraying of pure Al and Ni powders mixture followed by post-annealing was suggested. The powder composition of Al and Ni was 75:25, and 90:10 (wt.%) to expect full consumption of pure Ni into intermetallic compounds. After Al-Ni composite coatings, the Ni particles were finely dispersed and embedded in the Al matrix with a good coating yield. Above 450 °C of post-annealing temperature, the Al3Ni and Al3Ni2 phases were observed in the cold-sprayed Al-Ni coatings. The Ni particles in the Al matrix were fully consumed via compounding reaction with Al at 550 °C of the annealing temperature. |
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Keywords: | Cold spray Al-Ni Annealing Composite Coatings |
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