钛酸铝质多孔隔热材料的制备

PREPARATION OF POROUS INSULATING ALUMINIUM TITANATE MATERIAL

以钛酸铝、莫来石、镁铝尖晶石为原料,淀粉为成孔剂,PVA为粘结剂,采用滚球法制备钛酸铝质陶瓷空心球,并以该空心球为主要原料,可塑成形工艺制备多孔隔热材料。研究了空心球大小配比对材料导热系数、抗压强度、体积密度等性能的影响。结果表明:在大球(孔径约3mm)、中球(孔径约2mm)、小球(孔径约1mm)的质量比为3∶4∶3时,经过1500℃×60min工艺处理可以得到导热系数为0.126w/k·m、体积密度为1.26g/cm3、抗压强度为6.43MPa的多孔隔热材料。

Aluminium titanate hollow balls were prepared by the rolling-ball technology, using aluminium titanate, mullite, magnesium aluminate spinel as starting materials, amylum as a pore-making agent and PVA as an adhesive agent. A porous insulating material was also prepared by the plastic formation method with the above hollow balls as main raw materials. Effects of particle sizes of hollow balls on the coefficient of heat conductivity, compressive strength and bulk density, etc. were investigated. The results show that the porous insulating material with good performances （namely, coefficient of heat conductivity 0.126w/k .m, bulk density 1.26g/cm3 and compressive strength 6.43MPa） may be obtained when the proportion of big, middle and small hollow ball is 3 ： 4 ： 3 （mass ratio） after heat treatment at 1500℃ for 60min.