Comparison of Different Cermet Coatings Sprayed on Magnesium Alloy by HVOF

In the present study, two different cermet coatings, WC-CrC-Ni and Cr3C2-NiCr, manufactured by the high-velocity oxy-fuel (HVOF) method were studied. They are labeled as follows: WC-CrC-Ni coating-WC and Cr3C2-NiCr coating-CrC. These coatings were deposited onto a magnesium alloy (AZ31) substrate. The goal of the study was to compare these two types of cermet coating, which were investigated in terms of microstructure features and selected mechanical properties, such as hardness, instrumented indentation, fracture toughness, and wear resistance. The results reveal that the WC content influenced the hardness and Young's modulus. The most noticeable effect of WC addition was observed for the wear resistance. WC coatings had a wear intensity value that was almost two times lower, equal to 6.5 center dot 10(-6) mm(3)/N center dot m, whereas for CrC ones it was equal to 12.6 center dot 10(-6) mm(3)/N center dot m. On the other hand, the WC coating exhibited a lower value of fracture toughness.

Automated summary

In this study, two different cermet coatings, WC-CrC-Ni and Cr3C2-NiCr, were compared in terms of microstructure features and selected mechanical properties. It was found that WC content influenced hardness and wear resistance, with WC coatings exhibiting lower fracture toughness.