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HVOF



HVOF The HVOF (High Velocity Oxy-Fuel) process combusts oxygen and one of select group of ignitable gases including: propane, propylene, or hydrogen. Although the HVOF system uses the basic principle of combustion, the spray gun is designed differently than the standard oxy-fuel spray gun. The HVOF gun differences produce higher flame temperatures and higher velocities. The result is more thoroughly melted powder and more kinetic energy available to "flatten" the molten particles of coating material. The HVOF process produces superior bond strength and coating density.







The HVOF process is most often used to apply high melting temperature metals and metal alloys such as: tungsten carbide, Inconle®, chrome carbide, Stellite®, and Tribaloy®.








FLAME SPRAY



Flame spray, also known as oxy/acetylene combustion spray is the original thermal spray technique developed about 100 years ago. It uses the basic principles of a welding torch with the addition of a high velocity air stream to propel molten particles onto the substrate. The coating material can be either a wire or powder form. Often flame spray coatings are fused after being applied to enhance bond strengths and coating density.








PLASMA SPRAY



Plasma SprayThe plasma spray process (non-transferred arc), uses inert gases fed past an electrode inducing the "plasma" state of the gases. When the gases exit the nozzle of the gun apparatus and return to their normal state, a tremendous amount of heat is released. A powdered coating material is injected into the plasma "flame" and propelled onto the substrate.



Ceramic Coatings are most often applied using plasma spray due to their high melting temperatures. (Often > 3500 F). Several types of ceramic coatings can be applied using plasma spray.







ELECTRIC WIRE ARC



Electric Wire ArcElectric wire arc thermal spraying utilizes the same principles employed in wire arc welding systems. The coating material, in wire form, is electrically charged, and then contacted creating an arc. The molten droplets of metal wire are then sprayed onto the substrate using a high velocity air stream to atomize and propel the material.







Arc spray coatings are very cost effective and are typically used to apply metals like pure aluminum, zinc, copper, and metal alloys such as stainless steel. Arc spray also allows adjustments to achieve varied coating texture (200 micro inches – 800 micro inches).











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