A supersonic flame was produced in HVO/AF through the combustion of kerosene and the mixture of oxygen and air. The flame Temperature can be adjusted between 1400 and 2800 °C through changing the flux ratio of oxygen and air in the mixture. Three kinds of nanostructure WC-12Co coatings were sprayed by HVO/AF under three different spray conditions. Experiments results show that the coatings bond well with the substrates with very dense structure. The decarburization reduces with the decrease of flame temperature. Nanostructure coatings were much denser than microstructure coatings with about 0.4 to 0.5 times increase in microhardness.

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