采用平均粒径为10.16 μm的α-Al2O3粉体为原材料,利用注浆成型技术制备陶瓷膜支撑体.设置正交实验,研究成孔剂、粘结剂、烧结助剂(硅酸钠+TiO2+CaCO3+MgO)含量及保温时间对支撑各性能的影响;在正交实验结论基础上,通过改变烧结温度,于低温条件下制备出性能良好的陶瓷膜支撑体.实验表明:硅酸钠用量、成孔剂用量、粘结剂用量和保温时间最佳组合分别为4%、6%、0.6%和2 h.在1400~1450 ℃温度区间内制得的支撑体各性能指标均相对较优,适宜作为陶瓷膜载体使用.
The α-Al2O3 with 10.16 μm average particle size was used to prepare ceramic support by using slurry casting method.According to orthogonal experiments, the effects of pore forming materials, binders, sintering aids(sodium silicate+TiO2+CaCO3+MgO) and heat preservation time on the properties of supports had been investigated.On the basis of orthogonal experiment, with sintering temperature changing, the ceramic membrane supports with good performance was obtained at low temperature.The orthogonal experiment show that the best combination of factors is confirmed as follows: sodium silicate 4%, pore forming materials 6%, binders 0.6% and the heat preservation 2 h.Between 1400~1450 ℃ low temperature rage, the supports which showed better performance than those with other condition are prepared, and suitable for use as ceramic membrane supports.
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