Calculating and measuring contact angles of Zn–4.5%Al melt on Ceria substrates. (November 2015)

• Record Type: Journal Article
• Authors: Zhou, H.; Gu, M.; He, X.; Bai, Y.; Wang, Z.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 8
• Page Start: S8-788
• Page End: S8-791
• Publication Date: 2015-11
• Subjects: Wetting -- Contact angle -- Nanocomposites; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000001883
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : The wetting behaviour of Zn−4.5%Al melts (ZA) on Ceria substrates was analysed in terms of surface tension, contact angle and chemical reactivity. Equilibrium equation calculating stable contact angle between high-energy interfaces was presented. The apparent contact angles of ZA melts on the untreated and treated CeO2 -baseplates in argon were measured by the sessile drop method and the influence of a carbonisation layer on wetting was discussed. The results show that simplified Good–Girifalco equation can be used to predict contact angles of metal/ceramic couples, and that, from classical thermodynamic point of view, reactions between the carbonisation layer and zinc oxide may take place at the interface, which promotes the wetting. As a result, the contact angle decreases from 111.6° to 87.6° and ZA liquid can wet CeO2 substrate.