This technology injects wire-type spray materials into a thermal spray machine generating high-temperature heat sources such as flames or plasma to convert them into solidified or semi-solidified materials, and sprays the materials on the surface of the base material to create coating layers. Types of the technology include HVOF, Plasma, Flame, and Arc spray.
- HVOF
- The high velocity oxygen fuel (HVOF) spraying technology heats and solidifies powdered materials by exploding oxygen and flammable gas with the spray gun, and sprays the materials at a high speed on a product to create coating layers.
- Features
- The HVOF spray produces coating layers with high adhesive strength and low porosity, owing to the 3,100℃ flames and high-speed spraying at 2,100 m/sec. (Porosity: 0.7% or less, adhesive strength: 12,000–16,000 psi)
- An HVOF equipment is suitable for spraying tungsten carbide, chrome carbide, and other metal powders. Its coating quality surpasses those of any other spraying equipment. The equipment is particularly effective for tungsten carbide thermal spraying.
- PLASMA
- The plasma thermal spraying technology uses high-frequency electric arc to generate plasma by ionizing gas into electrons, neutrons, and positrons.
- Features
- Ionized plasma generates high-temperature heat at 16,500℃, which solidifies powdered materials sprayed at 650 m/sec to create coating layers.
- The technology ensures high-energy density, allowing for thermal spraying of metals with high melting points or various ceramic materials.
- It allows for a wide selection of coating materials as it can be applied to any solidifiable material, be it metal or ceramic.
- The high-speed plasma jet produces high-density coating layers by spraying the materials on the base material at a high speed.
- The physical and chemical properties of coating layers can be adjusted, as the impact energy and solidification speed change depending on the heat source type and other conditions.
- FLAME
- The flame spraying technology uses oxygen and gas fuel for low-temperature/low-speed coating. The technology is classified into wire flame spraying and powder flame spraying.
- Wire Flame Spraying
- This technology heats wires or rod-type materials using oxygen, flammable gas, and combustion flames, spraying the materials at a high speed with air pressure to create coating layers. Otherwise known as “metallizing,” this technology is typically applied to metals and limited types of ceramic materials.
- Powder Flame Spraying
- This technology sprays powdered materials heated with the same heat sources as above on the base material by using gas to create coating layers. It is typically used for thermal spraying of self-fluxing alloys made of Ni, Cr, B, and Si. This technology fuses the powdered materials with the base material to create a nonporous alloy layer with superb adhesive strength and corrosion resistance.
