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Wettability of the System of Cast Iron and Magnesia Ceramics with Graphite

Hosadyna-Kondracka Małgorzata, Nowak Rafał, Turalska Patrycja, Bruzda Grzegorz, Boroń Łukasz, Wawrylak Marek

Archives of Foundry Engineering

2022

Vol. 22, iss. 3

25--33

In this paper examinations of high-temperature wetting tests of 3 systems of liquid alloy – cast iron in contact with ceramic materials: magnesia ceramics in combination with natural graphite were presented. After wettability testing, the microscopic observations of the morphology of the sample surface and the cross-section microstructure with the chemical composition in micro-areas were examined. One of the objective of this work was also to verify whether the graphite content would affect the wettability of the magnesia ceramics. The study of high-temperature wetting kinetics of the liquid alloy in contact with the ceramic material, by the "sessile drop" method with capillary purification (CP) procedure was conducted. Under the test conditions, at a temperature of 1450°C and time 15 minutes, all 3 experimental systems showed a non-wetting behaviour. The average contact angle for the system with cast iron drop on magnesia ceramics was 140°, on magnesia ceramics with 10 parts per weight of graphite was 137° and on magnesia ceramics with 30 parts per weight of graphite - 139°. Microscopic observations revealed that in the case of the sample consisting of the cast iron drop on the substrate with magnesia ceramics, the formation of fine separations was not observed, unlike the systems with the substrate with magnesia ceramics and the addition of natural graphite. Numerous, fine droplets accumulate on the graphite flakes and consist mainly of Si as well as Fe and O. On the other hand, the rough MgO grains have a gray, matt surface, without fine separations. The conducted observations indicate the mechanical nature of the bonding - liquid metal penetrates into the pores of the rough ceramics of the substrate. However, in the case of systems of cast iron drop with magnesia ceramics and addition of graphite, probably the adhesive connection and the physical attraction of elements derived from cast iron drop with the flake graphite appeared as well.

Zastosowanie powłok SiO2-TiO2 w protetyce stomatologicznej

Walczak M., Bieniaś J., Surowska B.

Postępy Nauki i Techniki

2011

nr 11

98-106

Przeprowadzono badania przyczepności czterech kombinacji połączeń: Ti/Triceram, Ti/SiO2-TiO2/Triceram, Remanium 2000/Vita Keramik i Remanium 2000/ SiO2-TiO2/Vita Keramik metodą trzypunktowego zginania (wg PN-EN ISO 9693). Powłoki SiO2-TiO2 nanoszone były na tytanowe i kobaltowe podłoże metodą zol-żel. Otrzymane wyniki badań wykazały większą przyczepność połączenia Ti/SiO2-TiO2/Triceram w stosunku do układu połączenia Ti/Triceram bez warstwy przejściowej zol-żel. Zastosowanie powłoki przejściowej zol-żel w przypadku stopu CoCrMoW nie podwyższa wytrzymałości połączenia metal-porcelana, a otrzymane wyniki są zbliżone do rezultatów uzyskiwanych z zastosowaniem tradycyjnych technik przygotowania i napalania dentystycznych koron. Potwierdza to celowość stosowania ceramicznej warstwy pośredniej na podłożu tytanowym.

The bond strength by three-point bending (according to PN-EN ISO 9693) of four combinations Ti /Triceram, Ti/SiO2-TiO2/Triceram, Remanium 2000/Vita Keramik and Remanium 2000/ SiO2-TiO2/Vita Keramik was evaluated. Coatings SiO2-TiO2 on base titanium and cobalt alloy were deposited using sol-gel method. The results showed that the bond strength of Ti/SiO2-TiO2/Triceram and Ti/SiO2/Triceram in control group was significantlyhigher than the Ti/Triceram without intermediate layers sol-gel. Application of SiO2-TiO2 intermediate sol-gel coating on CoCrMoW alloy doesn't increase bond strength of metal-porcelain, and the results obtained are similar to the commercial techniques. The purposefulness of the application of the intermediate ceramic layer on base titanium was been confirmed.