What is Hvof Gun?
Hvof gun is utilized to interest the coating to metal components for protection. High-Velocity Oxygen Fuel is the protecting coating applied to metal components. In the Hvof coating process, a metallic powder is melted by 5000°C flame. This initiates a mechanical bond & protects the surface. HVOF Gun needed a very high velocity for the coating process.
HVOF Coating Process
HVOF (High Velocity Oxy-Fuel) thermal spray process operates just powder as coating material preferably than thermal spray wire or rods as in other operations. There are two kinds of HVOF coating processes these are following;
1. Detonation Gun HVOF system
2. Continuous combustion HVOF system
The usage of various fuel gases, cooling systems, & fact that the penultimate explosion is sustained by a timed spark, used to ignite particle & gas combination are the foremost differences between these processes, although their core concept is the same.
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Let's discuss the working of HVOF Spray Gun.
The HVOF spray gun process ably combusts oxygen & either gaseous or liquid fuel to generate high kinetic energy with restrained warmth intake. The coating material, in powder form, is insinuated into the hot gas streamlet & evenly heated to a molten as a choice semi-molten state.
HVOF technique is a kind of thermal spray technology. Hvof system operates on an oxyfuel mixture of hydrogen, propane, or propylene. Powdered coating substance is delivered into an ignited gas mixture via the rear of the guns. A converging/diverging nozzle (air cap) accelerates the flame & thermal spray powder to achieve supersonic gas & particle accelerations, moving the powder particles toward substrate to exist coated. At particle speeds nearing 3000 ft/s (gas speeds exceed 7000 ft/s) & flame temperatures approaching 5000 F, the mixture warms atomized powder & deposits it on a substrate. HVOF technology was selected for this experimentation for the reason of its capacity to create higher-density coatings (extremely lower porosity 2%), with more powerful bond strength & more downward residual stresses for wider coatings.
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For the reason of its versatility & higher coating grade when corresponding to other thermal spray procedures, the HVOF coating process is one of the numerous typical thermal spray technologies & includes existing employed in numerous industries. HVOF coating process generates a covering with more powerful adhesive strength, hardness, & reduced porosity than further thermal spray approaches like plasma spray.
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When the powder particles struck the substrate, they flatten plastically, cooling & solidifying to make a coating. Increased particle velocities, homogeneous heating & a fast dwell duration result in coatings that are thick & powerfully bound to the substrate. Layer chemistries are better predictable, & coating microstructures are acceptable & homogenous.
HVOF Spray Gun Uses
The HVOF spray gun employs in different industries, especially in the Aeronautical industry, both in the commercial & defense airline units. Further occupations of application of the HVOF gun have petrochemical, automotive, paper/pulp, & manufacturing industries.
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HVOF coating explanations with a new line of spray tools & materials. Created to fulfill the requirement of our customers for more challenging, additional wear & erosion-resistant surfaces.