It is a亚博全站官网登录网址system utilizing the combustion of gases or liquid. Combustion gases such as hydrogen and liquid fuel such as kerosene are used. Oxygen and Fuel mix and atomize inside the combustion area under limitations that monitor the suitable combustion mode and pressure needed for coating.
HVOF Gunrequired 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 Gun spray process high combustion pressure and high velocity of gas and particle resulting in high coating quality.
HVOF process’s key benefits are that the high velocity of the system contains extremely high coating density and low oxide content. The low oxide content due to the speed of the particles spending less time within the heat source. And also due to lowerflame spray guntemperature (approx 3,000 °C) of the heat source compared with alternative processes.
HVOF Gun coatingvery thick coating due to high velocity in compression alternately of tension and also producing excellent bond strength.
In this process mostly used coating materials are Nickel & Cobalt-based alloys, Iron-based alloys, Carbides & Cermets. A very thick coating of carbide is used in excess of 6mm.
HVOF Gun Process:
HVOF spray gunis used for a high-temperature application, chemical resistance, erosion, wear resistance sliding, and abrasive.
In HVOF a mixture of gaseous or liquid fuel with oxygen is fed into a combustion chamber combusting continuously and ignited. For travel of hot gases at pressure 1 MPa converging & divergingblasting nozzlesare used. Hot gases travel through a straight section and impinge on the component.
InHVOF Gunand thermal spray gun use, fuel can gas like hydrogen, propane, methane, acetylene, and natural gases. And liquid fuel likes kerosene.
The jet velocity at the exit of the nozzle (>1000m/s) increases the speed of sound. A powder feedstock is injected into the gas stream to accelerates the powder up to 800m/s. The stream of hot gases and powder is pointed towards the surface on which coating is needed. Powder partially melts and impinges on the substrate.
HVOF coatingmay be thick 6mm to 12mm. This mostly utilized material such as ceramic and metallic layers. HVOF is most successful for the coating of carpet materials (WC-Co).
HVOF Gun Manufacturers in India
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What is thermal spray coating?
What is thermal spray ?
Thermal sprayis a technique in which utilizes a combustionflameor electrical energy to fuse several types of substances(materials), forming acoatingon the surface of the substrates, and attaching a high-quality, high-performance surface covering for a variety of equipment and devices.亚博全站官网登录网址is versatile, with application achievable on substrates in a broad variety of types and shapes, wherecoatingthickness can be specified from thin films to thick overlays. This technology is heavily used in all types of industrial fields for upgrading and diversification, as well as improving substrates performance, and development of substrates with new functions.
Features of Thermal Spray Gun
Features of thermal spray
- Several types of materials can be used in the surface coating (thermal spraying materials) depends on the purpose of modification and application.
- Correction is possible for large and complex-shaped equipment, down to small parts. Additionally, a broad variety of coating thicknesses can be chosen, from thin films to thick overlays.
- during spraying the thermal spray substrate temperature remains 200°C or approx.which allows the material to keep its organizational structure and physical properties.