关键词: K₂Ti₆O₁₃晶须, 大孔陶瓷, 粒径, 分子筛膜

Abstract: The K2Ti6O13 macroporous ceramics were prepared by dry pressing method with raw materials of K2Ti6O13 whiskers, K2CO3 and TiO2 powers, and the pore structure was controlled by changing the length of K2Ti6O13 whiskers and using the accumulation of whiskers with different size. The relationship among the particle size, the ratios of whiskers with different particle size and the properties of permeability and bending strength of porous K2Ti6O13 ceramics were investigated. Results show that the bulk density and bending strength of K2Ti6O13 porous ceramics increase with the decrease of the particle size of K2Ti6O13 whiskers, contrary to the behaviors of the porosity and the permeability. When K2Ti6O13 porous ceramics were prepared using the accumulation of K2Ti6O13 whiskers with different size which the length was D50=7.50 μm and 1.60 μm, the corresponding mass ratio was 3:1, the framework of K2Ti6O13 ceramic were connected with the long whiskers and the medium or small particles. This K2Ti6O13 ceramic exhibits optimal properties as follows: a bending strength of 42.8±0.2 MPa, a pure water flux of 2366 L.m-2.h-1.MPa-1 and its open porosity is 36.4%, respectively. The performance of K2Ti6O13 porous ceramic prepared from whiskers with different size was better than that of ceramic with uniform whiskers on permeability and bending strength. This material shows excellent potential in the area of molecular sieve membrane.

Key words: K₂Ti₆O₁₃whisker, macroporous ceramics, particle size, molecular sieve membrane