lämpöruiskutusta

Lämpöruiskutus, also known as thermal spraying, is a group of coating processes in which heated material is sprayed onto a surface. The source of heat can be combustion, electric arc, or plasma. The coating material is typically in powder, wire, or rod form and is melted or softened by the heat source before being propelled by a high-velocity gas stream onto the substrate. Upon impact, the molten or softened particles flatten, rapidly cool, and adhere to the substrate, building up a coating layer by layer.

There are various thermal spray processes, each with its own advantages and applications. Flame spraying uses a fuel gas and oxygen flame to melt and propel coating materials. Arc spraying utilizes an electric arc between two consumable electrodes to melt the wire feedstock. Plasma spraying employs a high-temperature plasma jet generated by an electric arc to melt and accelerate the coating particles. High-velocity oxygen fuel (HVOF) spraying uses the combustion of a fuel gas with oxygen to create a high-velocity, high-temperature jet.

Thermal spraying is used to improve the surface properties of components, such as wear resistance, corrosion protection, thermal insulation, and electrical conductivity. It can be applied to a wide range of materials, including metals, ceramics, and polymers, and is used in industries like aerospace, automotive, power generation, and manufacturing. The process allows for the application of coatings to complex shapes and can repair worn or damaged parts.