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HVOF Gun HVOF stands for High-Velocity Oxy-Fuel . In this high-velocity oxy-fuel is supplied by the gun. HVOF Gun  required a very high velocity for the coating process. This high velocity is used to propel the particles at supersonic speed before impact onto the substrate. In the spray process high combustion pressure and high velocity of gas and particle resulting in high coating quality. Two types of Hvof on basics fuel Liquid Fuel Gas-Fuel HVOF Gun Application High density. Typical coatings have less than 2% porosity and some coatings as low as 0.5% porosity.  High bond strength. For example, typical carbide coatings sprayed with HVOF exhibit bond strengths in excess of 69 MPA (10,000 psi). Other coating materials sprayed with HVOF have significantly higher bond strengths than the same materials applied using other atmospheric thermal spray processes such as air plasma spray.   Optimum Hardness. A 12% tungsten carbide / cobalt coating will hav...

Twin Wire Arc Spray Gun Twin Wire Arc Spray Gun is a gun in which two wires   anode and cathode respectively fed into the gun. When two wires touched it creates a spark and causes heating of those wires. Through which molten metal is poured onto the subject. The Twin Wire Arc process is a common commercial thermal spray process. It uses abrasive as a wire only other abrasive can't be used in Arc Spray Gun . Twin Wire Arc  the coating is applied using a spray torch, which brings two electrically energized feedstock wires together. When the wires cross, an arc, similar to a welding arc, forms between the wire tips and causes them to melt. A gas stream injected behind the arcing wire tips atomizes the molten feedstock material and propels it downstream. When molten droplets of the feedstock material encounter the substrate the droplets flatten, solidify, and form a coating containing the characteristic lamellar structure associated with thermally sprayed materials....

Flame Spray Gun Flame Spray Gun  is the thermal spraying of a group of coating processes in which finely divided  metallic  or nonmetallic materials are deposited in a molten condition to form a coating. This simplest device was based on the principle that if a wire rod were fed into an intense, concentrated flame, (the burning of a fuel gas with oxygen), it would melt. If the  flame  was surrounded by a stream of compressed gas, the molten metal would become atomized and readily propelled onto a surface to create a coating.  Flame spray gun  process variation in which the controlled explosion of a mixture of fuel gas, oxygen, and the powdered coating material is utilized. it melts and propels the material to the workpiece. Flame Spray Gun Process Flame spray gun  spraying is the oldest of the thermal spraying processes, characterized by low capital investment, high efficiency, deposition rates, relative ease of operation and cost of ...

HVOF Gun (High Velocity Oxy Fuel Gun)   devices are a subset of the flame spray gun . There are two differences between the traditional flame spray and HVOF. HVOF uses limited combustion and a widespread nozzle to heat and stimulate the powdered coating material. Characteristic HVOF devices operate at hypersonic gas velocities, i.e. greater than MACH 5. The ultimate velocities afford kinetic energy which helps provide coatings that are extremely dense and very well adhered to in the as-sprayed condition. Benefits  of  HVOF Gun: Low porosity        Higher bond strength (>10000 psi) Uniform repeatability Low operating cost Higher particle velocities Stable deposition rate Controlled coating thickness Safety interlocks