Lämpöspraytekniikoiden

Lämpöspraytekniikat, also known as thermal spray, encompass a group of coating processes where finely divided materials are heated to a molten or semi-molten state and propelled at high velocity onto a surface. The particles then flatten and solidify upon impact, forming a dense and adherent coating. These techniques are widely used to enhance the surface properties of materials, such as wear resistance, corrosion protection, thermal insulation, and electrical conductivity.

The primary methods within thermal spray include flame spraying, arc spraying, plasma spraying, and high-velocity oxy-fuel (HVOF) spraying. Flame spraying uses a combustion flame to melt and propel coating materials. Arc spraying employs an electric arc between two consumable electrodes to melt the wire feedstock. Plasma spraying utilizes a high-temperature plasma jet generated by an electric arc to melt and atomize the powder feedstock. HVOF spraying uses the combustion of fuel and oxygen to create a high-velocity gas stream that accelerates and heats the coating particles.

The choice of thermal spray technique depends on factors such as the desired coating properties, the nature of the substrate material, the type of coating material, and economic considerations. The sprayed materials can range from metals and alloys to ceramics and polymers. Thermal spray coatings find applications in diverse industries, including aerospace, automotive, energy, and manufacturing.