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 Liquid fuel and oxygen are fed via a premixing system and at high pressure into a combustion chamber where they burn to produce a hot high pressure gas stream. This is expanded through a laval type nozzle increasing the gas velocity to around 1500m/sec and the pressure to slightly above atmospheric. At this stage the powder can easily be injected into the gas stream.
This gas stream heats and accelerates the powder particles within the confines of the secondary nozzles so that they impact with tremendous energy upon the substrate material. MET-JET 4L HVOF System The Metallisation MET-JET 4L is the latest development to our kerosene fuelled HVOF system. All of the great features of the MET-JET III have been retained: the system is still mass flow controlled for repeatable coating quality and you have a choice of start-up gas either hydrogen or propane fuelled. The system produces the densest metallic and carbide coatings of all. The coatings can be compressively stressed, allowing thick layers to be applied without fear of spalling. The latest developments are to the pistol, powder feeder and operator interface. The pistol combustion chamber has been modified to achieve cleaner burning and the nozzle arrangement simplified. The powder feeder has mass flow controlled carrier gas and closed loop motor control for reliability and repeatability of powder feed rates. The operator interface is still simple to follow but is now via touch screen rather than pushbuttons. The result is a high quality, compact and easy to use HVOF system. Applications:
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