溶融マンガンによるアルミナのぬれと反応
1999 年 63 巻 8 号 p. 1009-1014
詳細
1999 年 63 巻 8 号 p. 1009-1014
A basic research study for improvement of plasma-sprayed alumina coatings has been conducted. The wettability of the molten manganese/alumina ceramic system was examined by the sessile drop method. A MnAl2O4 spinel layer was formed at the interface, suggesting the existence of wettability between the molten manganese and the spinel. When the spinel was dense, the contact angle was about 88 deg for the temperature range from 1573 K to 1623 K. When there were open pores in the spinel layer and a sintered porous spinel substrate was used, the contact angle exceeded 90 deg. Therefore, the effect of interfacial conditions on the wettability was discussed. Owing to the rapid vaporization of manganese, the contact angle decreased with time at temperatures of 1673 K and above.
