文献类型：期刊文献

中文题名：镁铝尖晶石多孔陶瓷的制备及性能

英文题名：Preparation and Properties of Gel-casting Magnesia–Alumina Spinel Porous Ceramics

作者：李思蒙[1];黄建国[1]

机构：[1]华东理工大学材料科学与工程学院

年份：2018

卷号：46

期号：9

起止页码：1257

中文期刊名：硅酸盐学报

外文期刊名：Journal of The Chinese Ceramic Society

收录：CSTPCD;;EI(收录号：20184706088075);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

语种：中文

中文关键词：镁铝尖晶石;富镁尖晶石;凝胶注模;多孔陶瓷;耐腐蚀性

外文关键词：magnesia-alumina spinel;magnesia rich spinel;gel-casting;porous ceramics;corrosion resistance

摘要：以MgO、Al2O3、TiO2为起始原料、石墨为造孔剂,采用凝胶注模法制备了镁铝尖晶石多孔陶瓷。研究了Mg和Al摩尔比、TiO2的添加、烧结温度等因素对试样物相形成及显微结构的影响。利用X射线衍射仪、场发射扫描电子显微镜、万能材料试验机、孔隙率测试仪等对样品性能进行了分析。结果表明：添加3%（质量分数）的TiO2,可以促进纯镁铝尖晶石相的形成,并且可以降低材料的烧结温度。组成中适量富镁,可以使尖晶石晶粒较为细小,形状更规则,提高了样品的抗弯强度和耐腐蚀性。控制Mg：Al摩尔比为1.3：1.7、TiO2添加量3%,在1 400℃保温5 h烧结条件下,可获得孔隙率为36.73%、抗弯强度为40.8 MPa的镁铝尖晶石多孔陶瓷,其耐碱腐蚀性较好,有望用于制备碱性环境下使用的陶瓷膜支撑体。
Porous magnesia-alumina spinel ceramics were fabricated by a gel-casting method using MgO, A12O3, TiO2 as starting raw materials and graphite as a pore forming agent. The effects of Mg：A1 molar ratio, TiO2 addition and sintering temperature on the phase formation and microstructure of the samples were investigated. The performance of the samples was characterized by X-ray diffracometer, field emission scanning electron microscope, universal material testing machine, and porosity tester, respectively. The results show that the addition of 3% of TiO2 （in mass fraction） can promote the formation of pure magnesia-alumina spinel phase and reduce the sintering temperature of the material. Furthermore, a small amount of magnesium enriched in the composition can make the spinel grains smaller and more regular in shape, and improve the flexural strength and corrosion resistance of the samples. When the Mg： A1 molar ratio is 1.3：1.7 and TiO2 mass fraction is 3%, the porous ceramic sample can be obtained at a calcined temperature of 1 400 ℃ for 5 h. Under this condition, the porosity and the flexural strength of the sample are 36.73% and 40.8 MPa, respectively. The sample has a good resistance to alkali corrosion and is expected to be used for the ceramic support of membrane under alkaline environment.