What other repairs are accomplished using plasma spraying?

• A. It is limited to hot end parts
• B. It is limited to cold end parts
• C. It is not applicable to turbine blades
• D. It is equally applicable to hot end parts as well as cold end parts

Answer: (D)

Plasma spraying is a versatile coating method used to repair and protect turbine parts by depositing material onto worn surfaces. It is equally applicable to hot end and cold end parts because it can apply a wide range of coating materials and thicknesses to suit different service conditions. On hot-end components, ceramic thermal-barrier or oxidation-resistant coatings are applied to reduce heat transfer and high-temperature wear. On cold-end components, wear- and corrosion-resistant metallic or cermet coatings are sprayed to restore dimensions and extend life. The process builds up material and can conform to complex shapes, making it suitable for repairs across both ends of the engine.