| 摘要 |
The invention relates to a process and a device for the high-speed flame-spraying of refractory filler materials in the form of wire and powder for the coating of surfaces, wherein, by means of at least two gas-mixing systems running independently of one another, the spraying filler material in the form of wire or powder, introduced into a primary combustion chamber, is fused by primary heating flames arranged concentrically around a charging channel, accelerated by the resulting high-speed flame and passed through a primary expansion nozzle bore into a downstream secondary combustion chamber, through which the primary high-speed flame passes at supersonic speed, taking along the melt-plastic filler materials, and which leads into a downstream water-cooled secondary expansion nozzle, axially widened centrically, or into the bore thereof, so that a zone of reduced pressure is generated in the region of secondary fuel gas/oxygen channels arranged radially, axially and/or in a focusing manner and leading into the secondary combustion chamber, and a fuel gas mixture can be fed at low inflow pressures and, in the secondary chamber, the fuel gas mixture is ignited and expanded radially, axially around the primary high-speed flame and, due to a high flame temperature and an extreme ignition and combustion rate, contributes to the final fusion of the spray filler materials and to their additional acceleration. <IMAGE> |
