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1. 发明专利

JPH0477358A ALUMINA-CARBON BASE NON-CALCINED REFRACTORY 失效
公开(公告)号：JPH0477358A
公开(公告)日：1992-03-11
申请号：JP19229990
申请日：1990-07-19
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： SATO TSUTOMU , SHINTANI HIROTAKA , OGUCHI MASAO , NAKAJIMA MASAYOSHI , MUROI MICHINORI
IPC分类号： C04B35/043 , C04B35/04 , C04B35/10 , C04B35/103
摘要： PURPOSE:To increase the slug resistance property by adding the specified quantity of a magnesia-chrominum based raw material into an alumina-carbon base refractory. CONSTITUTION:This refractory incorporates 3-70wt.% of the magnesia-chrominum based raw material in the refractory blended with the alumina based raw material and the carbon base raw material. Generally, the magnesia-chrominum based raw material has the chemical formula expressed by Mg(Fe)>>[Al,Fe,Cr2O3]O. This compound forms easily a solid solution with alumina and has the residual linear expanding property accompanying 5-10% of the volume expansion. Thus, a crack at a joint at the time of cooling the furnace is hardly produced in the wall of the furnace consisting of piled bricks, and the falling of the bricks caused by the crack at the joint and also the infiltration of the molten iron and steel into the joining parts are avoided, thus the occurrence of unexpected trouble caused by the abnormal damage of the metallurgical furnace caused by the refractory is prevented. When the adding quantity of the magnesia-chrominum based raw material is base than a lower limit, the improvement of the corrosion resistance and the effect on the increase in the residual linear expansion are insufficient and in the case of exceeding an upper limit, the strength after utilizing for a long period is reduced.

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