The influence of Ni ion plating 0.1 to 3.1 μm thick on the wettability of molten Al to Al2O3 was measured by the sessile drop method in a vacuum of 2 × 10-3 Pa at temperatures from 973 to 1173 K. The wetting angle of molten Al to Al2O3 decreased from 110° to 90° as the temperature rose from 973 to 1173 K. Ni coating on Al2O3 reduced the wetting angle to less than 10° when the thickness of coating was larger than 0.1, 0.5, and 0.8 μm at 973, 1073 and 1173 K, respectively. The thinner Ni coating could not improve the wettability, because the Ni deposits on Al2O3 were coagulated by surface tension and pores were generated in Ni coating. The development of pores became more remarkable as temperature rose, making the molten Al which once spread on the Ni coating move back towards the receding wetting angle to Al2O3. The interaction between the coated Ni and the molten Al was also metallographically investigated.
|ジャーナル||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|出版ステータス||出版済み - 1991|
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