| 摘要 |
PROBLEM TO BE SOLVED: To be applicable to all linings of a ladle such as a bottom or the like by forming its one end of a material having a high pyrometric cone equivalent, the other of a material having a low thermal conductivity and an intermediate part between the one end and the other of a material obtained by mixing both the materials, thereby reducing a difference of thermal expansion characteristics of both the materials for forming a boundary surface. SOLUTION: A surface of a ladle in contact with a molten steel is formed of an alumina 5 having a high pyrometric cone equivalent, and a ladle shell side is formed of a material containing 60 to 100 wt.% of an agalmatolite having a low thermal conductivity as a main component. A central part is formed of a material dividing into two or more layers and having inclined properties of the thermal conductivity and the pyrometric cone equivalent from a surface layer to a shell side by changing a content ratio by mixing the alumina and the agalmatolite. As to an intermittent functionally gradient refractory material with the alumina and the agalmatolite, the surface layer contains 100% of the alumina, a second layer 6 is formed of a composite material containing 75% of the alumina and 25% of the agalmatolite, a third layer 7 is formed of that containing 50% of the alumina and 50% of the agalmatolite, a fourth layer 8 is formed of that containing 25% of the lumina and 75% of the agalmatolite, and a final layer 9 contains 100% of the agalmatolite. |
