| 摘要 |
PURPOSE:To minimize the erosion of refractories and to improve the life of the refractories by joining refractories of different materials by providing a downward angle relative with the normal of the working surface of the refractories to the boundary surface of said refractories. CONSTITUTION:The boundary surface 7a of refractories of different materials is provided with a prescribed downward angle theta relative with the normal 12 of the working surface 5a of the refractories. More specifically, if the angle theta decreases, the effect of decreasing the damage in the joint part of the boundary is low and if the angle theta is too large, a problem arises in terms of production and installation of the refractories. The damage in the joint part 7 at the boundary in the casing of subjecting the upper and lower parts of a vessel for molten metal to zone lining with refractories of different materials such as a basic material and an acidic material, etc. is thus minimized and the life of the refractories is extended.
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