Abstract：In order to investigate the wear mechanism of MgO-C brick from the point of wettability， the sessile drop method was employed to measure the contact angle between liquid and solid phase. The wettability between MgO-C substrate as well as two main components in the substrate and LF refining slag was studied. At the refining temperature， graphite substrate was not wetted by the molten slag， and the lower temperature it was， the more non-wetting it became. While the MgO component was completely wetted by the slag. There was an obvious turning point of contact angle between molten slag and MgO-C substrate in the range of 1 460 ℃ and 1 480 ℃. Below the turning point， the reaction between MgO and C was restrained for the lower temperature， and the MgO-C substrate kept un-wetted by molten slag. Above the turning point， the MgO reacted with carbon， and Mg vapor and CO gas were generated. The carbon content was reduced for the reaction， leading to the fast decrease of contact angle between molten slag and substrate. Once the contact angle was smaller than 90°， the molten slag penetrated into the substrate. The pores formed by the reaction between MgO and carbon became the main channel for the penetration of slag. When the slag penetrated into the substrate and reached at the interface of unreacted layer， the non-wetting property between the slag and unreacted layer and few pores prevented the further penetration of slag.
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2016, Vol. 51 
