Internal Diameter Coating Production by Pulsed Gas Dynamic Spraying

The aim of this work is to assess the ability of pulsed gas dynamic spraying to deposit coatings on the inside surface of cylindrical workpieces. Thick dense copper coatings are produced on flat surfaces and on the inner surface of cylindrical workpieces using a specially designed gun extension. The coatings are evaluated based on microstructure and microhardness in order to determine if the copper has the same characteristics on all surfaces. A comparison between pulsed gas and cold gas dynamic sprayed copper coatings is also presented.