Wetting behaviors of molten melt drops on polycrystalline Al2O3 substrates in high magnetic fields

doi:10.1016/j.jmst.2019.08.037

Abstract

Abstract:

We measured the contact angles of Al and Sn drops on polycrystalline Al₂O₃ substrates in various high magnetic fields at different temperatures. The contact angles of both Al and Sn drops on the Al₂O₃ substrates decreased under high magnetic fields. These decreases strongly depend on the temperature, magnetic flux density, magnetic properties of the metal drops, and the reactivity of the metal drops with Al₂O₃. Our results reveal that the wetting behavior of molten metal drops on ceramics can be modified by a high magnetic field.

Key words: Wetting, Contact angle, High magnetic field, Molten metal

Tie Liu, Yubao Xiao, Zhengyang Lu, Noriyuki Hirota, Guojian Li, Shuang Yuan, Qiang Wang. Wetting behaviors of molten melt drops on polycrystalline Al₂O₃ substrates in high magnetic fields[J]. J. Mater. Sci. Technol., 2020, 41: 187-190.

Figures/Tables 5

Fig. 1. Images of the molten metals on the substrates, with the observation direction parallel to the magnetic field (B) direction and perpendicular to the gravity (G) direction: (a) Al-Al2O3, 750 °C, 0 T; (b) Al-Al2O3, 750 °C, 6 T; (c) Sn-Al2O3, 300 °C, 0 T; (d) Sn-Al2O3, 300 °C, 6 T. Experimental measurements of contact angle as a function of time: (e) Al-Al2O3 at 750 °C; (f) Sn-Al2O3 at 300 °C.

Fig. 2. Change of contact angles of Al-Al2O3 and Sn-Al2O3 with temperature.

Fig. 3. Variation in the contact angle with the change of magnetic flux density at different temperatures for molten (a) Al and (b) Sn on an Al2O3 substrate.

Table 1 Variation in the contact angle with magnetic flux density at different temperatures for molten Al on an Al2O3 substrate.

Temperature/°C	690				720				750
Magnetic flux density/T	0	2	4	6	0	2	4	6	0	2	4	6
Contact angle/°	129	116	120	108	125	111	117	106	123	109	115	105

Table 2 Variation in the contact angle with magnetic flux density at different temperatures for molten Sn on an Al2O3 substrate.

Temperature/°C	263				278				300
Magnetic flux density/T	0	2	4	6	0	2	4	6	0	2	4	6
Contact angle/°	125	111	109	102	121	114	112	105	119	115	117	108

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Wetting behaviors of molten melt drops on polycrystalline Al₂O₃ substrates in high magnetic fields

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