摘要
以粉煤灰为骨料,采用添加造孔剂法制备粉煤灰基多孔陶瓷过滤材料,研究了造孔剂用量和烧结温度对其性能的影响.通过压汞仪、X射线衍射仪和场发射扫描电子显微镜等分析测试技术对试样进行了性能表征.结果表明:随着造孔剂用量的增加,显气孔率和吸水率升高,抗弯强度和密度下降.提高烧结温度可以有效提高抗弯强度,而不影响材料的主要物相组成;当烧结温度大于1 175℃时,显气孔率和透气度显著下降.造孔剂用量为35%,烧结温度为1 175℃时,可制得抗弯强度大、气孔发达及高比表面积的多孔陶瓷过滤材料.
Porous ceramics were prepared from fly ash by adding a pore-making agent. Some effects of the amount of the poremaking agent and sintering temperature on the properties of the porous ceramics were studied. The properties of specimens were characterized by pressure mercury analyzer, X-ray diffraction （XRD） , and field emission scanning electron microscopy （SEM）. The results show that with the pore-making agent increasing, the porosity and water absorption increase, but the bending strength and density decrease. Increasing the sintering temperature can improve the bending strength of the porous ceramics. However, main phases in the porous ceramics are similar at different sintering temperatures. As the sintering temperature is more than 1 175 ℃, the porosity and gas permeability decrease significantly. When the amount of the pore-making agent is 35% and the sintering temperature is 1 175 ℃ , the fly ash porous ceramics for filtration have high bending strength, advanced porosity and high specific surface area.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第3期318-322,共5页
Journal of University of Science and Technology Beijing
基金
上海市重点学科建设基金资助项目(No.P1502)
关键词
粉煤灰
多孔陶瓷
孔径分布
透气度
显微结构
fly ash
porous ceramics
pore size distribution
gas permeability
microstructure
