高温烟气过滤陶瓷的制备与性能研究

Preparation and Properties of Filtering Ceramics for High Temperature Exhaust Gas

本论文以堇青石为过滤陶瓷骨料,以高岭土、钾长石、锂辉石为结合剂,以木炭粉为造孔剂,通过半干压成型工艺成型,研制了高温烟气过滤陶瓷。详细研究了结合剂、造孔剂添加量以及成型压力、烧成温度对高温烟气过滤陶瓷的体积密度、显气孔率、抗压强度等性能的影响,并对原料配方进行了优化,优化配方为:堇青石75wt%、结合剂25wt%、炭粉造孔剂50wt%、三聚磷酸钠0.5wt%。研究结果表明:试样的显气孔率随造孔剂添加量的增加而升高、随结合剂添加量的增加而减小;抗压强度和烧结密度随造孔剂添加量的增加而减小、随结合剂添加量的增加而升高;随成型压力的增大,过滤陶瓷的显气孔率呈逐渐减小的趋势,抗压强度则不断增大。随烧成温度的升高,过滤陶瓷的显气孔率呈先升高后减小的趋势,而抗压强度则逐渐增大。

Fihering ceramic for high temperature exhaust gas were prepared by the half dry pressing molding with cordierite as the base material, potash feldspar, spodumene, kaolin as bonding agents and charcoal as pore former in this study. The effects of the pore former content, bonding agent content, and molding pressure and sintering temperature on the sintered density, apparent porosity and compressive strength etc. were examined for the filtering ceramic in detail, and the raw material formula was optimized. The optimized formula was： cordierite 75wt%, bonding agent 25wt%, pore former charcoal content 50wt%, sodium tripolyphosphate 0.5wt%. The experimental results showed that the apparent porosity of the filtering ceramic increased gradually with increasing the pore former content, but decreased with increasing the bonding agent content; the compressive strength and sintered density decreased with increasing the pore former content, but increased with increasing the bonding agent content; with increasing the molding pressure, the apparent porosity decreased gradually, but the compressive strength increased; with increasing the sintering temperature, the apparent porosity increased at first and then decreased, but the compressive strength gradually increased.