锆酸钙对镁质弥散型透气耐火材料性能的影响

摘要

The dispersed gas-permeable magnesia refractories with different calcium zirconate content were prepared by adding calcium zirconate with three methods of in-situ synthesis,direct addition and composite addition with pure magnesia as aggregates.The effects of the addition amount and addition method of calcium zirconate on the performance of the refractories were studied.The results show that with the increase of calcium zirconate amount by direct addition,the gas permeability,apparent porosity and bulk density of the samples increased and the linear shrinkage and strength decreased while the thermal shock resistance first increased and then decreased and reached the highest value with the calcium zirconate addition of 9wt%.Among the three addition methods,the gas permeability,apparent porosity,bulk density and linear shrinkage of the samples by in-situ synthesis were the highest and the strength was the lowest;while the sintering performance of that by composite addition was good and the strength and thermal shock resistance were the highest.%以高纯镁砂为骨料，通过原位合成、直接添加、复合添加锆酸钙三种方法制备了不同锆酸钙含量的镁质弥散型透气耐火材料，研究了锆酸钙添加量和添加方式对该耐火材料性能的影响。结果表明：随着直接添加方式下锆酸钙加入量的增加，试样的透气度、显气孔率和体积密度增大，线收缩率和强度减小，抗热震性能则先增后降，当锆酸钙质量分数达到9％时最高；在三种添加方式下，以原位合成方式添加锆酸钙试样的透气度、显气孔率、体积密度、线收缩率均最大，强度最低，而复合添加方式下试样的烧结性好，强度和抗热震性能最高。