Although HVOF is a new process compared to the other spraying systems, its interest is rapidly growing and the quality of the obtained coatings is very promising. Lots of developments have been performed in the field of equipment (torch design...), powder and modelling. However, the gas used in the process is also a major factor since it directly influences the state of the particle striking the substrate. The aim of this presentation is to remind some basic knowledges about HVOF combustion and to present how the gas can influence this process.

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