Abstract
The aim of the current investigation was to study the high-temperature tribological performance of the high-velocity Oxyfuel sprayed 65% (NiCrSiFeBC)−35%(WC–Co) coating at the temperatures ranging from room temperatures to 800°C. The coating was produced on the hot forming die steels namely AISI H11 and AISI H13. The microstructural characteristics, surface roughness, microhardness, porosity and bond strength of the as-sprayed coatings were determined. Tribology study was done on the pin-on-disc tribometer at 0.5 m s−1 sliding velocity under the loads of 25N and 50N. The results have shown that the developed coating exhibited lower porosity, higher microhardness and performed much better than the uncoated specimens. The wear mechanisms of the coated specimens were mainly abrasive at room temperatures. Adhesive and oxidative wear were observed as the dominant mechanisms at the elevated temperatures.
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