日本金属学会誌

J. Japan Inst. Metals, Vol. 55, No. 11 (1991),
pp. 1199-1206

Wettability of Al2O3 Substrate by Liquid Iron---Effects of Oxygen in Liquid Iron and Purity of Al2O3 Substrate

Kunihiko Nakashima1, Kenji Takihira2, Katsumi Mori1 and Nobuya Shinozaki3

1Department of Materials Science & Engineering, Kyushu University, Fukuoka
2Graduate Student, Kyushu University, Fukuoka. Present address: Mizushima, Kawasaki Steel Co., Okayama
3Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu

Abstract:

The interfacial properties between liquid Fe-O alloy and alumina substrates with different purities, 99.9% and 96%Al2O3, were measured by the sessile drop method. The interfaces of samples after the experiment were examined by SEM and EPMA.
It was found that the contact angle increased and the work of adhesion decreased with increasing oxygen concentration in the iron in the range of less than 0.010%. These phenomena were attributed to the dessociation of Al2O3. For 96%Al2O3, the Ca and Mg rich layer was observed at the Fe-Al2O3 interface. Whereas, at higher oxygen concentrations, the contact angle decreased with increasing oxygen concentration. Under these conditions, the formation of the hercynite or the penetration of iron into the grain boundaries of Al2O3 substrates were observed.


(Received 1991/7/22)

Keywords:

liquid iron-oxygen alloys, alumina, interfacial property, surface tension, contact angle, work of adhesion, surface-active element, sessile drop method


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