Investigation of Wetting Characteristics of Liquid Iron on Dense MgAlON-based Ceramics by X-Ray Sessile Drop Technique
2006 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 37, no 3, 421-429 p.Article in journal (Refereed) Published
The wetting characteristics of liquid iron on dense MoAlON-based composite ceramics were investigated using X-ray sessile drop technique. The contact angles were measured on substrates of different composites as functions of temperature and varying partial pressures of oxygen. The results with pure argon gas showed that contact angles kept almost constant in the temperature range 1823 to 1873 K. The contact angle was found to show a slight increase with increasing boron nitride (BN) content in MgAlON-BN composites. These are attributed to the higher contact angle between BN substrate and liquid iron drop compared with that obtained for MgAlON substrate. When the CO-CO2-Ar gas mixtures were introduced into the system, the contact angle showed an initial quick decrease followed by a slow decrease and then a period of nearly constant contact angle at a given temperature corresponding to the steady-state condition. Even in this case, BN seemed to cause an increase in the equilibrium contact angle. The equilibrium contact angle was found to decrease with increasing temperature. XRD results indicated that the substrate was oxidized and the oxidation products combined with FeO formed by the oxidation of the iron drop to form FeAl2O4 and Mg1-xFexO. These were likely to form a ternary FeO-Al2O3-MgO slag or a quaternary slag by combining with B2O3. An interesting observation is that the iron drop moved away from the original site, probably due to the Marangoni effect.
Place, publisher, year, edition, pages
2006. Vol. 37, no 3, 421-429 p.
spinel, wettability, resistance, surfaces, al2o3, mgo
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-5480DOI: 10.1007/s11663-006-0027-6ISI: 000237948700011ScopusID: 2-s2.0-33845676556OAI: oai:DiVA.org:kth-5480DiVA: diva2:9860
Uppdaterad från "In press" till published: 20100929.
QC 201009292006-03-152006-03-152012-02-14Bibliographically approved