Streszczenie: W pracy podjęto próbę wytwarzania przeciwzużyciowych warstw powierzchniowych hybrydową metodą naddźwiękowo-elektroiskrową. Powłoki z WC12Co i WC17Co zostały naniesione systemem do natrysku naddźwiękowego TAFA-JP-5000. Modyfikacja powłok obróbką elektroerozyjną została wykonana za pomocą urządzenia ELFA-541. Ocenę własności powłok przeprowadzono na podstawie analizy mikrostruktury, badaniach tribologicznych oraz pomiarach mikrotwardości i chropowatości.
Abstract: Hypersonic sprayed WC-Co coatings are widely used in different wear situations because they combine such advantages as resistance to wear, high temperature and corrosive atmospheres. The influence of the spray parameters and material type on the coating properties has been analyzed thoroughly by numerous researchers. This study focuses on the performance properties of two HVOF-sprayed tungsten carbide coatings, each with a different content of cobalt, which were subjected to electrical discharge machining (EDM). The material deposited over the HVOFsprayed coatings was tungsten carbide. The microstructure of the sprayed and electro-discharge-machined coatings was analyzed with a JOEL JSM-5400 scanning microscope. A ball-on-disc test was conducted to determine the coefficients of friction. The EDM process results in the formation of a homogeneous layer of tungsten carbide with a low cobalt content, which is well bonded with the HVOF-sprayed coating. The values of the coefficient of friction obtained for the two coatings with the EDM layer were similar.
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YADDA/CEON