Get started
Work

Effect of MoSi2 on the microstructure and wear resistance of NiCrBSi coating with CuNi interlayer on aluminum alloy

Year: 2025
Type: article
Abstract: In this study, the MoSi2 reinforced NiCrBSi coatings were prepared on the aluminum alloy by laser cladding. A Cu-based interlayer was utilized to refrain undesirable intermetallic compounds caused by the diffusion of Al element at the interface between composite coating and substrate as well as to improve the metallurgical quality of the composite coating. The effects of different content of MoSi2 (0, 10 and 20 wt.%) on the microstructure evolution and wear resistance of the NiCrBSi coatings were investigated. Experimental results show that the CuNi transition layer is composed of (Cu, Ni) solid solution, without obvious cracks or pores and exhibits excellent metallurgical bonded to the substrates. The phases present in the NiCrBSi coating without MoSi2 addition includes γ-Ni solid solution, Ni3Fe, Ni3Si, Ni3B and Cr23C6. MoSi2 reinforced NiCrBSi coatings mainly include γ-Ni solid solution, Ni3Fe, Ni31Si12, CrB, Mo2C and SiC. With the MoSi2 content increasing to 20wt.%, the content of Ni31Si12, CrB and carbides in the coating has significantly increased, which enhanced the microhardness and mechanical properties of the NiCrBSi coating. All three coatings exhibited lower mean friction coefficients and wear rates than aluminum alloy substrate, the composite coating with 20wt.% MoSi2 had lowest mean friction coefficient and wear rate. The excellent wear resistance can be attributed to the combination of CrB and carbides hard reinforcing phases as well as the Ni31Si12 tough phase.
DOI: 10.1016/j.jmrt.2025.04.125
Language: English
Open Access status: gold
Estimated APC paid: $1,640
OpenAlex ID: W4409544704
FWCI: 0.894
Cites: 44
Cited by: 3
Related to: 10