completely corroded and consumed in molten steel, as reported by Marple and Sinclair [60,61]. Thus, it is necessary to add refractory components as inhibitor to form the protective barrier against corrosion. Experimental results for corrosion morphologies of composite with different ZrO2 content after corroded by molten steel at 1600◦C for 40 min are investigated systematically, as shown in Fig. 13 [63]. The remarkable result is that no dense transition layer can be detected in the composite incorporation with 10 vol.% ZrO2.The ZrO2 skeleton would have a potential problem of collapsing due to loss of the matrix structure since ZrO2 particles are not enoughto overlap together. When ZrO2 content is more than 20 vol%, thedense transition layer begins to form, and its thickness increases with increasing ZrO2 content