m-ZrO2和ZrSiO4对MgO-CaO砖性能的影响

Effects of m-ZrO_2 and ZrSiO_4 on properties of MgO-CaO bricks

以镁钙砂、中档镁砂、高纯镁砂粉、单斜氧化锆（m-ZrO2）、锆英石等为原料，研究了ZrO2的加入形式与加入量对MgO—CaO砖性能的影响。结果表明：当ZrO2以m-ZrO2的形式加入到MgO—CaO砖中时，可以提高试样的常温性能、抗水化性、抗热震性等，m—ZrO2加入量（质量分数，下同）为2％-7％时，试样具有良好的常温性能，加入量为5％时抗水化效果较好，加入量为10％-15％时抗热震效果较好；当ZrO2以锆英石细粉的形式加入时，会明显提高试样的抗水化性及抗热震性，锆英石加入量为5％时，试样的抗水化性及抗热震性优越，但随着锆英石加入量的增加，试样的体积密度、强度明显下降，加入量大于10％以后，制品大多疏松开裂。

The effects of addition and type of ZrO2 on properties of MgO -CaO bricks were studied with magnesia - calcia sand,middle grade magnesia, high purity magnesia powder,monoclinic zirconia （m-ZrO2） and zircon as starting materials. The results show that. （ 1 ） When m-ZrO2 is added to MgO - CaO bricks, properties at room temperature, hydration resistance and thermal shock resistance are improved. Properties at room temperature of the bricks with 2% -7% m-ZrO2, hydration resistance of the bricks with 5% m-ZrO2, thermal shock resistance of the bricks with 10% - 15% m-ZrO2 are good. （2）When ZrSiO4 is added to bricks, hydration resistance and thermal shock resistance are improved obviously, and they reach the opti- mum values while ZrSiO4 addition is 5%. But bulk density and strength decrease obviously with the increase of ZrSiO4 addition. When ZrSiO4 addition is more than 10%,most bricks are loose and cracking.