HVOF D-Gun

HVOF Detonation Gun

The HVOF D-gun (HVOF detonation gun) process is the foremost kind of HVOF process utilized. High Velocity Oxygen Fuel (HVOF) spraying is a bunch of thermal spray gun processes that spray flames at supersonic velocities.

HVOF detonation gun is a type of HVOF thermal spray coating process in which a proscribed detonation of a mixture of oxygen, fuel gas, and powder coatings is used to melt the powder and accelerate the molten coating material onto the workpiece. The detonation gun consists of a few feet long & 1-inch in diameter nozzle with water cooling bucket and has some coupled valves for gas and coating powder.

The Hvof D-Gun consists of a barrel, 1 - 1.5 m lengthy & 20 - 30 mm inner diameter, into which a gas combination is insinuated and ignited by a spark plug. During a short bum moment, the flame facade accelerates, condensing and heating the unreacted gases in front of it. When a critical temperature is reached, self-ignition produces a detonation or shock wave. For an equi-molar ratio of oxygen and acetylene the shock wave travels at a constant velocity of - 3000m/s, and at a maximum temperature of 3500K. Powder particles of the Hvof D-Gun thermal coating material (carried in nitrogen) are sprayed into the unreacted gas combination before ignition. As the detonation wave passes via the discontinued particles, they are warmed and can be revved to a velocity overreaching 700m/s. The enormous kinetic energy achieved by the particles is discharged as warmth as a consequence with the substrate, & benefits to create the best bonded and most elevated density thermally sprayed coatings.
The HVOF D gun conflagrations between four and eight times per second affect a circular area of coating ~250mm in diameter, & 6 μm wide per detonation, with a nitrogen purge between individual cycles. HVOF gun delivers heightened noise levels (150 dB) & functions at all in acoustically protected cells. It has been employed especially gainfully to spray light coatings from a capacity of carbides, oxides, cermets, & high-temperature alloys. Nevertheless, similar to numerous thermally sprayed coatings, Hvof D-gun depositions contain residual tensile pressure which can result in a significant reduction in the exhaustion strength of certain substrates such as titanium alloy.

HVOF D-Gun Coating

The mixture of carefully measured gases (typically oxygen and acetylene) is fed into a barrel together with a powder whose particle size is less than 100 microns. In the D-Gun spark is used to burst into flame the gas, and as the powder moves along the barrel, the resultant blast heats and accelerates the powder. The gas travels at supersonic speeds and the powder has entrained enough distance to accelerate to supersonic speeds, typically nearly about 760m/sec(2400ft/sec)26. After each explosion, the nitrogen purge bucket was used. The process is frequently repeated more than a few times per second. Every individual explosion resulted from a few microns thick layer deposition. A coating thickness is very uniform and a comparatively smooth flat surface can be achieved by carefully automating the process. Thus, coating particles are tightly packed and bonded to the surface due to their high bond strength and high density; HVOF D-gun thermal coating has developed into an outstanding technique of thermal spray coating. Deposit-coated surface roughness of the Hvof D-gun coating varies from about 60 microns to over 300 microinches Ra, depending on the type of coating. While for many applications, the coating is applied in a depositional manner, but mainly are milled or ground, and milled and ground to 1 to 10 microinches Ra. Typically the coating thickness is about 0.002 to 0.020 inches, although thinner and thicker coatings are sometimes applied depending upon the particular application. The HVOF D-gun coating process is referred to as the “line of sight” Coated surface area can be seen at the end of the barrel.

HVOF D-Gun Coating Properties

• The preferred method for producing elevated-quality wear-resistant coatings.
• Thermal spray coatings with the most elevated thickness.
• Excellent adherence.
• Extremely strong bonding.
• Hvof d-gun Coating that is uniform.
• Carbides provide amazing wear resistance.
• Erosion resistance is exceptional.
• Application Temperature is Low.
• Residual Pressure is lower.
• Increased Consequence Resistance.
• Residual Pressure Range: Uninvolved to Compressive (Greater Thickness Capability).
• Minor chipping and skinning corresponded to further Thermal Spray Processes.

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