Abstract
In this paper, wear properties of NiCrBSi–SiC coatings were investigated using the ball-on-disk wear test. In experimental study, NiCrBSi–SiC powders were sprayed using a high-velocity oxygen fuel technique on an SAE 1030 steel substrate. Powder mixtures with different weight mixing ratios, NiCrBSi + 10 wt% SiC, NiCrBSi + 20 wt% SiC and NiCrBSi + 40 wt% SiC coatings were prepared. The deposited coatings are compared in terms of their phase composition, microstructure and hardness. It is proved that the degree of mixing of the NiCrBSi and SiC components in the powder has a massive effect on the phase composition, microstructure and hardness of the coatings. Wear tests were conducted on both the uncoated and coated substrates at same normal load, speed, and wear distance. It has been determined that the coated substrates exhibit a very good tribological performance in comparison to the uncoated substrate. The increase in the adhesive wear resistance provided by the coating has been attributed to the presence of a large amount of dispersed Ni and Cr carbide and/or borides in the Ni matrix.
Highlights
High-velocity oxygen fuel (HVOF) is a coating deposition process whereby a powder coating material is heated rapidly in a hot gaseous medium
The main advantage of HVOF compared to other thermal spray techniques is the ability to accelerate the melted powder particles of the feedstock material at a relatively large velocity [13,14]
The influence of spray parameters on the microstructure and mechanical properties of Colmonoy 88 alloy HVOF coating were studied by Sosa et al [27]
Summary
High-velocity oxygen fuel (HVOF) is a coating deposition process whereby a powder coating material is heated rapidly in a hot gaseous medium. The HVOF thermal spraying process has shown to be one of the best methods for depositing conventional Ni-based and NiCr feedstock powders, because the hypersonic velocity of the flame shortens the time of interaction between the powder and the flame [15] These effects in conjunction with the relatively low temperature (as compared to plasma-based techniques) result in less decomposition of the carbide particles during spraying. Nickel-based alloys are applied extensively in a number of applications both because of their outstanding wear and corrosion resistance at high temperatures and their relative low cost [16,17,18].
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