红柱石骨料对脱硫喷枪用莫来石浇注料热震稳定性的影响

Effect of andalusite aggregate on thermal shock resistance of mullite castable for desulphurization injection lance

采用水冷法研究了红柱石骨料对脱硫喷枪用莫来石浇注料于 80 0℃和 14 0 0℃烧后热震稳定性的影响。结果表明 ,随着试样中红柱石骨料含量的增加 ,烧后试样的热震稳定性提高。其原因是由于红柱石骨料和莫来石基质的热膨胀系数不一致 ,在烧后试样中产生了自发裂纹 ;同时 ,自发裂纹也使烧后试样的抗折强度降低。

Effect of andalusite aggregate addition on thermal shock resistance of mullite castable heat-treated at 800 ℃ and 1400 ℃ respectively was studied by XRD analysis,EDA and SEM.The results showed that the thermal shock resistance of the castable was improved with the increase of andalusite addition.The reason is that the cracks formed by differences of thermal expansion coefficient between andalusite aggregates and matrix in castable stop the propagating of cracks formed during thermal shock.Meanwhile,the cracks also decreased the MOR of the fired specimens.