锆英石对镁铝铬不烧砖烧结性能的影响

Influence of ZrSiO_4 on Sintering Property of Magnesite-alumina-chrome Unfired Brick

以电熔镁砂、高纯镁砂、α-氧化铝微粉和氧化铬微粉为主要原料,研究分析锆英石对镁铝铬不烧砖热膨胀性、烧后试样常温物理性能以及热震稳定性的影响。结果表明:锆英石加入量小于4wt%时,镁铝铬不烧砖在1100～1300℃之间的线膨胀率和线膨胀系数随锆英石加入量增大而减小。锆英石加入量大于4wt%时,镁铝铬不烧砖在1100～1300℃之间的线膨胀率和线膨胀系数随锆英石加入量增大而增大,在1170℃时镁铝铬不烧砖试样的线膨胀率和线膨胀系数的增加趋势减弱。经1100℃和1500℃烧后的镁铝铬不烧砖试样烧后线变化率随着锆英石加入量增加而增大,加入4wt%锆英石的镁铝铬不烧砖试样在热震前后的常温耐压强度和热震后试样常温耐压强度保持率最高。

Using fused magnesia, high-pumy magnesia, a-A12O3 and Cr203 micro powder as the major raw materials, the effect of ZrSiO4 on the expansion property, normal temperature performance and thermal shock resistance of magnesite-alumina-chrome unfired brick were investigated. The conclusions are that when the ZrSiO4 addition was less than 4wt%, the linear expansion rate and linear expansion coefficient of magnesite-alumina-chrome unfired brick between 1100-1300℃ decreased with ZrSiO4 addition. When the ZrSiO4 addition was greater than 4wt%, the linear expansion rate and linear expansion coefficient of magnesite-alumina-chrome unfired brick increased with ZrSiO4 addition. The increasing trend of the linear expansion percent and coefficient of unfired brick were weakened at 1170 %. Linear changes of burned magnesite-alumina-chrome unfired brick burned at 1100℃ and 1500℃ increased gradually with the increased amount of ZrSiO4. The compressive strength and retention of compressive strength before and after thermal shock were the highest of all formula samples of the magnesite-alumina-chrome unfired brick that was added 4% ZrSiO4.