HVOF Thermal spray systems
HVOF is a thermal spray process utilising the combustion of gases, such as hydrogen, methane, propane, propylene, acetylene, natural gas or liquid fuels such as ethanol or kerosene. Fuel and oxygen atomise and mix within the combustion area. This mixture is ignited at controlled temperatures and pressures resulting in a flame with supersonic velocity. Material is injected into the flame and propelled towards the substrate to form the coating.
HV-50 HVOF - gas fuel
The HV-50GF is a stand-alone single process, mass flow controlled (MFC) HVOF gas fueled coating system.
HV-50 HVOF - liquid fuel
The HV-50LF is a stand-alone single process coating system, with mass flow controllers (MFC) for process gases and ES-flow controllers for liquid fuels.
HVOF Thermal spray coating process
Fuel and oxygen are fed into a combustion chamber where they are ignited and combusted continuously. The resultant hot gas expands rapidly and exits through a converging-diverging nozzle. The jet velocity produced at the exit of the barrel (>2,000 m/s) exceeds the speed of sound. A powder feedstock is injected into the gas stream at various locations, dependent on the chosen Gun or Torch. The particles are then accelerated up to approximately 700 m/s.
The jet of hot gas and powder (spray stream) is directed towards the surface to be coated. The powder partially melts in the stream and deposits upon the substrate. The resulting coating has, among other attributes, very low porosity and high bond strength.
A wide variety of materials can be applied using the HVOF process in thicknesses ranging between 0.05mm to several mm.
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