Thermal Spray

Thermal spraying allow realising many various
coatings onto a broad range of materials

	Plasma spraying designates a thermal projection which uses gas, mainly argon or helium, as an electrical conductor by ionisation. Plasma state is obtained by high power electrical discharge through the gas, inside a water cooled torch. Powder, injected into the plasma gas with a specific angle, melt and is projected on the substrate surface to be coated.
Plasma spraying

Consumables are two metallic wires, bulky or tubular. They are guided in the middle of a gas jet (air or nitrogen). An electrical arc occurred between the two wires, melted metal is atomised and thrown on surface of the part to coat.

Fuel and oxygen are blended inside the combustion chamber. Combustion, stable and uniform, provokes a constant pressure. Shape and sizes of the ejection pipe allow realising a supersonic gas jet and low pressure area for radial powder introduction. Exit speed of particles is directly in relation with the pressure inside combustion chamber. Melted powder is atomised and thrown on surface of the part to coat.

Theses kinds of equipments allow obtaining high performances coatings against wear, corrosion, adhesion or heat. Application domains are various like aeronautics, building, petrochemical, electronics, printing or biomedical.