Thermal Spray - Arc Processes
A simple, fast and economical thermal spray process for in-shop or on-site work.
The Electric Arc Wire Spray process uses two metallic wires, usually of the same composition, as the coating feedstock. The two wires are electrically charged with opposing polarity and are fed into the arc gun at matched, controlled speeds. When the wires are brought together at the contact point, the opposing charges on the wires create enough heat to continuously melt the tips of the wires. Compressed air is used to atomize the now molten material and accelerate it onto the workpiece surface to form the coating.
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Proven flexibility for the greatest range of surface functionality.
A strong electric arc is generated between a positively charged pole (anode) and a negatively charged pole (cathode). This ionizes the flowing process gases into the plasma state. Powdered feedstock material is injected into the plasma jet, melting the powder particles and propelling them to the surface of the workpiece.
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Thermal Spray - Combustion Processes
Liquid Fuel Technology with high acceptance in the petrochemical industry.
HVOF (high velocity oxygen fuel spraying) liquid fuel uses an oxygen-kerosene mixture. The coating material, in powdered form, is fed axially through the gun, generally using nitrogen as a carrier gas. The fuel is thoroughly mixed with oxygen within the gun and the mixture is then ejected from a nozzle and ignited outside the gun. The ignited gases surround and uniformly heat the powdered spray material as it exits the gun and is propelled to the workpiece surface.
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Gas Fuel Technology with high acceptance in the turbine industry.
Depending on user requirements, propylene, propane, hydrogen or natural gas may be used as the fuel in gas-fueled HVOF thermal spray systems. As a result of the high kinetic energy transferred to the particles through both HVOF processes, the coating material generally does not need to be fully melted. Instead, the powder particles are in a molten state and flatten plastically as they impact the workpiece surface. The resulting coatings have very predictable chemistries that are homogeneous and have a fine granular structure.
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The time-tested method for anti-corrosion thermal spray coatings and surface restorations.
The spray material in wire form is fed continually into a fuel gas-oxygen flame where it is melted by the heat of that combustion. Compressed air surrounds the flame and atomizes the molten tip of the wire. This accelerates the spray of molten particles towards the prepard workpiece surface. Combustion wire spray is a common choice for machine element repair and corrosion coatings. Either hard (higher melt temperature) or soft (lower melt temperature) wires can be used.
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Enhance surface properties, make repairs, restore tolerances, add protection.
The spray material in powder form is fed continually into a fuel gas-oxygen flame where it is typically melted by the heat of combustion. A powder feed carrier gas transports the powder particles into the combustion flame, and the mixed gases transport the material towards the prepared workpiece surface. It rapidly solidifies to form the coating. A cap that feeds compressed air surrounds and appropriately shapes the flame.
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