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参考实验室的研究结果,经过半工业试验,试制了标准型热稳定性镁砖,制成品的气孔率为18%;荷重软化点为1570°—1620℃;耐急冷急热性(水冷却)平均为107次,质量优于耐崩裂性铬镁砖;提供了继续改进的意见:应当采用粗颗粒的预先合成的尖晶石,其加入量为10—30%。添加氧化铝改善了镁砖热稳定性,认为是由于尖晶石与方镁石的膨胀系数不同,在制品烧成的冷却过程中,彼此的收缩不一样,因而产生了内应力,在一定的装填结构下,这种应力借助于不同组成的颗粒界面的开脱或基质部分的断裂而消除,制品内部产生了缝隙;缝隙的形成,缓冲了制品受急冷急热时所产生的另一种应力的作用,从而提高了制品的热稳定性。
According to the research result of the reference laboratory, the standard thermal stability magnesia bricks have been trial-produced through a semi-industrial test. The porosity of the finished product is 18%; the softening point is 1570 ° -1620 ° C; the quench- ) Had an average of 107 and gave better quality than chipping-resistant chrome-mazurites; further comments were provided: coarsely divided, pre-synthesized spinel should be used in an amount of 10-30%. Adding alumina to improve the thermal stability of the magnesia, that is due to the expansion coefficient of spinel and periclase are different, during the firing of the product cooling, shrinking each other is not the same, resulting in internal stress, at a certain Under the loading structure, the stress is eliminated by the break-up of the particle interface or the fracture of the matrix part with different compositions, and the gap is generated in the interior of the product; the formation of the gap alleviates the stress generated by the product when subjected to the rapid and sudden heating Role, thereby enhancing the thermal stability of the product.