Hvof Gun

Hvof Gun

High velocity oxy-fuel (HVOF) Spray Gun

HVOF Spray Gun ( High velocity oxy-fuel (HVOF) Spray Gun ) needed a very high velocity for the coating process. Before impacting on the substrate, this high velocity is utilized to drive the particles to supersonic speeds. High combustion pressure and great gas and particle velocity result in high coating quality in this type of spray technique. With a regulated heat input, the HVOF gun process efficiently combusts oxygen and a gaseous or liquid fuel to produce high kinetic energy.

The coating material, which is in powder form, is injected into the hot gas stream and uniformly heated to a molten or semi-molten state. A converging / diverging nozzle (air cap) accelerates the flame and powder to achieve supersonic gas and particle velocities, propelling the powder particles toward the substrate to be coated.

When powder particles collide with the substrate, they flatten plastically, then cool and solidify to form the coating. Coatings that are dense and strongly attached to the substrate are produced by combining high particle velocities, homogeneous heating, and a short dwell time. Coating chemistries are more predictable, and coating crystal lattices are fine and homogenous.

Thermal spraying is an innovation that improves or reestablishes the outer layer of strong material. This cycle is utilized to apply coatings of reasonable metals to a wide scope of materials and parts, to give protection from Wear, disintegration, cavitations, consumption, scraped spot, or hotness. Thermal spraying is additionally done to give electrical conductivity or protection, lubricity, high or low erosion, conciliatory wear, synthetic obstruction, and numerous other positive surface properties.

Thermal spray gun is generally utilized across numerous businesses as a favored strategy. It has an incredible breadth to build the existence of new parts or use attempted and tried methods, to fix and once again engineer worn or harmed parts.

Working rule of thermal Hvof spray coating

Thermal spraying coating depends on a similar technique for warming and dissolving a feed stock material, normally as powder or wire prior to speeding up it to a high velocity and afterward permitting the particles to strike the substrate surface.

The principle component of all thermal spray coating is their lamellar grain structure coming about because of the fast cementing of little globule particles, leveled from striking a virus surface at high speeds.

The coating is framed when a huge number of particles are kept on top of one another. These particles are mechanical or metallurgical attached to the substrate.

High-Velocity Oxygen Fuel ( HVOF Gun) spray, a thermal spray strategy used to improve or re-establish a part’s surface properties or aspects, accordingly expanding instrumentation life by extensively expanding disintegration and wear obstruction, and consumption security.

Liquid or semi-liquid materials region unit sprayed onto the surface by the heat(high temp.), high-speed gas stream, fabricating a thick spray which might be ground to an outrageously high surface end.

The usage of the High velocity oxygen fuel HVOF spray Gun method allows the machine of spray materials like metals, amalgams, and pottery to supply a spray of extraordinary hardness, exceptional bond to the substrate material, and giving generous wear opposition and erosion insurance.

hvof gun

Applications of High Velocity Oxygen Fuel (HVOF) Spray 

High-velocity oxygen fuel (HVOF) spray Gun is utilized to apply high quality sprays of cermets like WC/Co and WC/Co/Cr. Spray thickness is ordinarily in the reach of 0.1-2 mm. Trademark highlights of HVOF spray gun sprays incorporate their low degree of porosity at around 1-2vol% and low oxide content in the reach 1-2wt%. The bond strength frequently surpasses 80MPa. These sprays can be utilized across a range of designing and assembling applications to improve the surface properties of parts. This permits the arrangement of practical, high-execution parts produced using minimal expense or lightweight materials with a useful surface.


•      Diminished expenses

•      Further developed execution

•      Worked on electrical properties

•      Empowering parts to work in higher/lower temperatures

•      Empowering parts to work inside unforgiving compound conditions

•      Further developed productivity

•      Further developed existence of mating parts

Ordinarily saved spray materials include:

Cermets (for example WC/Co, WC/Co/Cr, Cr 3C 2/NiCr, NiCrSiBC)

Earthenware production (for example Cr 2O 3, Al 2O 3, ZrO 2)

Metal amalgams (for example prepares, nickel, chromium, and cobalt

 amalgams including NiCrSiB and MCrAlYs)

Unadulterated metals (for example Ni, Cu, Al, Mo, Ti)

Polymers (for example polyester, nylon)

Hvof Gun in India

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