工艺参数对石英质多孔材料孔性能的影响

摘要

以长江沿岸低品位石英砂为主要原料，采用真空烧结制备了石英质多孔材料。通过实验分析发现：随烧结温度的升高、水料比的增大或发泡剂含量的增加，多孔材料的气孔率增大，抗压强度降低；而随着保温时间的延长，多孔材料的气孔率降低，抗压强度升高。通过优化得出最佳配比为：石英砂60 wt%、高岭土30 wt%、助烧剂9.6 wt%、发泡剂0.4 wt%。按这一最佳配比配料，在水料比为0.9的条件下球磨2 h制浆发泡，而后在1175C烧结1 h，可以制备得到性能较佳的石英质多孔材料。%Quartz porous materials were prepared via vacuum sintering with the low-grade quartz sand along the Yangtze River as the main raw material. The effect of process parameters on the pore properties of the porous materials was examined. It was found by analyzing the experimental data that, with the increasing sintering temperature, or/and the increasing ratio of the water to raw materials, and/or the increasing content of foaming agent, the porosity of quartz porous materials increases and the compressive strength decreases. When the holding time during sintering increases, however, the porosity of the prepared materials decreases and the compressive strength increases. The optimal composition for preparing the quartz porous materials was determined to be 60 wt%quartz sand, 30 wt% Kaoline, 9.6 wt% sintering aids and 0.4 wt% foaming agent. With this composition, quartz porous materials with best properties can be obtained by bill-milling slurry for 2 h with the ratio of water to raw materials of 0.9, and then vacuum-sintering the green body at 1175C for 1h.