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 Thermospray™ 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.
