The effect of the addition of glassy carbon on the structure and properties of ZrO2-Y2O2 coatings deposited at the graphite substrate has been investigated. The coatings were deposited by plasma spraying method in an industrial company Plasma System SA Silesian Siemianowice using MIM40 equipment. The microstructure of coatings was investigated by light microscopy (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Abrasion was carried out with the use of tribological tester Ducom by pin-on-disc method. The results of investigations showed that the addition of the glassy carbon into coatings materials has increased microhardness and resistance against the wear.
This article presents results from the studies of protective coatings applied to industrial graphite molds used for the casting of non-ferrous metals. The selection of coatings was based on the results of measurements of surface wettability by liquid copper and microstructure examina- Słowa kluczowe: natrysk plazmowy, przemysł odlewniczy, mikrostruktura, zwilżalność
Powłoki ochronne nakładane metodami natrysku plazmowego oraz PVD na grafitowe krystalizatory przemysłowe
AbstractThe results of our research on the application of coatings for protecting industrial casting molds are presented. Tests were carried out on graphite molds with deposited Al 2 O 3 coatings containing the addition of glassy carbon and with W/Zr/DLC coatings, both examined after the process of pouring molds with molten aluminum bronze. The coatings were applied by two different methods; i.e., plasma spraying in the case of Al 2 O 3 + glassy carbon coating and PVD in the case of W/Zr/DLC coating. Reference tests were also conducted on graphite molds without coating. The use of protective coatings on graphite molds seems to be an effective solution. Studies have shown that coatings have good resistance during the casting process. The liquid metal sticking to the surface did not penetrate deep inside the graphite mold. The use of coating technology reduces the amount of downtime necessary to replace worn molds and increases the efficiency of the casting process. Keywords: graphite molds, protective coatings, plasma spraying, PVD Streszczenie W pracy przedstawiono wyniki badań dotyczące zastosowania powłok do ochrony grafitowych krystalizatorów przemysłowych. Badaniom poddano krystalizator grafitowy bez naniesionej powłoki, jak i z powłoką Al 2 O 3 z dodatkiem węgla szklistego otrzymaną metodą natrysku plazmowego oraz krystalizator z powłoką W/Zr/DLC otrzymaną metodą PVD. Przeprowadzone badania dowodzą, że zastosowanie powłok w celu ochrony powierzchni krystalizatorów może być skutecznym rozwiązaniem. Badania wykazały, że zarówno powłoki ceramiczne Al 2 O 3 + węgiel szklisty, jak i powłoka W/Zr-DLC zapewniają ochronę krystalizatora w trakcie kontaktu z ciekłym medium. Badania strukturalne oraz analiza składu chemicznego zostały przeprowadzane z zastosowaniem skaningowej mikroskopii elektronowej (HITACHI SU-70). Słowa kluczowe: krystalizatory grafitowe, powłoki ochronne, natrysk plazmowy, PVD
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