Metco's Polyester Powders are high temperature, materials that can be thermal sprayed to create low friction, self-lubricating coatings. They can be applied using standard Metco atmospheric plasma spray equipment, using argon/hydrogen or argon/helium plasma process gases. These materials cannot be plasma sprayed using nitrogen/hydrogen process gases, nor can they be applied using combustion powder ThermosprayT equipment.
Coatings of these materials can be finished by machining or grinding. They can be used at service temperatures up to 325 C (600 F).
Polyester coatings are useful for applications where a moderately low-friction, self-lubricating surface is required. Under light compressive loads, the coating surface becomes glazed and exhibits good sliding wear properties. Heavy compressive loads destroy the coating.
Metco 600NS-1 is often used as a filler constituents in abradable powder compositions, either as a dislocation phase that remains in the coating or as a fugitive phase that can be burned out after the coating is applied to create a friable, porous coating structure. However, coatings of pure polyester are not recommended for abradable seals in clearance control applications.
