氧化铝泡沫多孔陶瓷的制备

摘要

In this paper, alumina porous ceramics was fabricated by using polymer sponge replica method. The influences of polyacrylamide as additive on the viscosity of the slurry, the formability and the strength were investigated and the effect of the recoating process observed. The results showed that: the sample sintered at 1600t) for 2h had high strength when the formula consisted of 77.3% alumina, 18.2% Longyan Kaolin, 1.8% talc, and 0.5% polyacrylamide (the viscosity of the slurry t)o was 6.325pa-s, and the slip consistency was 1.27). The strength of the sample was significantly improved after recoating. The sample calcined at HOOt) was recoated and then sintered at 1500t:. Its bending strength can reach 3.54MP&%采用有机泡沫浸渍工艺制备氧化铝泡沫多孔陶瓷.研究了聚丙烯酰胺添加剂对浆料粘度,挂浆成型性能及样品烧后强度的影响,还研究了二次挂浆对氧化铝泡沫多孔陶瓷强度的影响.实验结果表明:当配方组成为氧化铝77.3％、龙岩高岭18.2％、膨润土2.7％、滑石粉1.8％,外加聚丙烯酰胺0.5％,浆料的粘度η0为6.325pa·s,厚化度为1.27,于1600℃,保温2小时烧后样品的强度高.二次挂浆可以显著提高氧化铝泡沫多孔陶瓷强度的影响.对1100℃烧成的样品二次挂浆,在1500℃二次烧成,样品抗弯强度达到3.54MPa.