Ni-Al-SiC powder mixture containing 12 wt.% SiC was prepared by conventional ball milling. Morphological and microstructural investigations showed that powder particles after 15 h of milling time had the optimum characteristics with respect to their size and microstructure. X-ray diffraction patterns of powder particles included only the elemental Ni, Al, and SiC peaks without any traces of oxides or intermetallic phases. The powder mixture was then deposited onto a steel substrate by atmospheric plasma spray (APS) process under different conditions. The results showed that under APS conditions used here, the coatings were composed of various intermetallics including Ni-Al and Ni2Al3. The mean hardness of coating was found to be about 567 HV. It was also found that by increasing current density of APS, the coating/substrate adhesive strength was increased.
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Acknowledgment
The authors acknowledge the Poodr Afshan Company (PACO) in Isfahan Science and Technology Town, for providing APS equipments.
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Hashemi, S.M., Enayati, M.H. & Fathi, M.H. Plasma Spray Coatings of Ni-Al-SiC Composite. J Therm Spray Tech 18, 284–291 (2009). https://doi.org/10.1007/s11666-009-9296-3
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DOI: https://doi.org/10.1007/s11666-009-9296-3