HVOF Gun (High Velocity Oxygen Fuel Gun) devices are a subset of flame spray gun. There are two differences between the traditional flame spray and HVOF coating process. HVOF Gun 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. An 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 HVOF spray process high combustion pressure and high velocity of gas and particle resulting in high coating quality. There are two types of HVOF guns driven by fuel type like gaseous or liquid in nature.
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HVOF Gun (High Velocity Oxygen Fuel Gun) instruments are a subdivision of the flame spray gun. There live two distinctions in middle of HVOF as well as ordinary flame spray. through warm & activated powdered coating material, HVOF Gun employs a narrow discharge & a broad nozzle. HVOF Gun devices are characterized by employing hypersonic gas velocities, which are larger relative to MACH 5. The most significant velocities afford kinetic energy which enables the provision of coatings that are too thick & extremely well attached to the as-sprayed status. HVOF Coating process with an HVOF Gun needed an extremely high velocity. Before affecting the substrate, this high velocity is utilized to drive the particles to supersonic speeds. High explosion pressure & great gas also particle velocity result in lofty coating grade in HVOF coating process. There are two kinds of HVOF guns driven by fuel type like gaseous or liquid in nature.
The HVOF (High Velocity Oxygen Fuel spray gun) Thermal Spray gun process is equal to flame powder spray gun, accompanied by exception that it existed designed to carry exceptionally lofty spray acceleration. There is a variety of HVOF guns available, each with its own method of gaining lofty speed spraying. A high-pressure water-cooled HVOF flame chamber with a long nozzle is one way. Fuel (kerosene, acetylene, propylene, also hydrogen) also oxygen live equipped into square, where discharge delivers a burning, high-pressure flame that is propelled from top to bottom a nozzle at a lofty acceleration. Powder is basically provided at lofty pressure from nozzle's center.
Specification of HVOF Spray Gun
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Internal Coating Diameter |
160 mm Minimum |
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Spraying Angles |
45° & 70° |
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Net Weight |
5 kg approx. |
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Spray Rate |
60 gm/min maximum |
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HVOF Coating Thickness |
2.0 mm maximum |
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HVOF Carbide Powder |
Particle size +5 -30 microns |
|
Gas Velocity |
550 – 750 m / s |
|
Cooling Capacity |
90 kW |
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Power in Flame |
200 kW |
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Combustion Chamber Pressure |
6-8 bar |
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Exhaust Flow (Min.) |
15,000 m3 / hr |
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Oxygen |
17– 20 bar 1100 nlpm |
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Nitrogen (Carrier Gas) |
8 – 10 bar 20 nlpm |
After a thorough review of the literature, two types of HVOF coating process powders, (1) WC-12CO and (2) Cr3C2NiCr, were chosen for the discharge Spray Coating Process also the High Velocity Oxygen Fuel Spray Coating Process. HVOF Gun is engaged for the coating process to prevent the surface of the material from rusting after surface preparation with the usefulness of an abrasive blasting machine. The indicated coatings contain good bond strength also wear resistance, according to research publications.
Tungsten Carbide Cobalt (WC-12CO): Tungsten Carbide Cobalt powder creates exceptionally dense also homogenous coatings with excellent abrasive wear resistance when sprayed using the Detonation Spray technique. Ambica Enterprises provides Tungsten Carbide powder, ceramic powder, and molybdenum powder, The powder is sintered & agglomerated, with a particle size of -45+20 microns.
Chromium Carbide-Nickel Chromium Powder (Cr3C2NiCr): When sprayed utilizing the Detonation Spray technique, Chromium Carbide & Nickel Chromium powder generate coatings that are extremely hard, dense, also well-bonded. For resistance to feeling uneasy wear also abrasive particle oxidation, a Chromium Carbide & Nickel Chromium coating is advised. The powder is sintered & agglomerated, with particle sizes ranging from 10-45 µm.
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