Preparing of NiAl and Ni₃Al Intermetallic Composite Coatings by Laser Cladding In Situ Synthesis

Abstract:

Ni-Al intermetallic compound coatings no visible cracks, pores or inclusions are prepared on mild steel substrate by Laser- cladding in situ synthesis with mixed powders of nickel-coated aluminum, Ni-based alloy and Al. The results show that the microstructure of the coating consists mainly of two phases of NiAl and Ni₃Al, and the former amount is more than the latter, with NiAl being uniformity and staggered fine dendrites which are surrounded continuously by Ni₃Al, and the atom ratios of Ni∶Al∶Fe∶Si in NiAl and Ni₃Al are respectively 54∶39∶2∶5 and 70∶21∶3∶6. Compared with cladding nickel-coated aluminum, the coatings quality are improved, and the dilution of iron from substrate into coating are greatly reduced, as a result of lower cladding powers due to self-fluxing of Ni-based alloy and exothermic reaction between Ni and Al. The hardness of coatings are up to HV490-HV540.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 636-641
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.636
• Online since: May 2011
• Authors: Guang Ping Cheng, Yi Zhu He
• Keywords: Coating, Intermetallic, Laser Cladding, NiAl

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