Abstract
The flow conditions of both fuel and oxygen gases to produce a supersonic flame with a high velocity oxy-fuel (HVOF) gun are experimentally investigated. The range of both fuel and oxygen flows to produce supersonic flame is limited by the choking condition and influenced by the gas pressures. The velocity of a typical flame was estimated to be over 1500 ms-1. The flame conditions also influence the structure and property of HVOF sprayed WC-Co coatings. The increase in the pressures of both fuel and oxygen tends to suppress the decarburization of WC during spraying. The flows of the both gases greatly influenced the properties of WC-Co coatings.
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