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

摘要： 以K2Ti6O13晶须、K2CO3和TiO2为原料，通过调变K2Ti6O13晶须的粒径，采用不同尺寸晶须间的混合，制备了孔结构可调的K2Ti6O13大孔陶瓷，考察了陶瓷的纯水通量和机械强度与K2Ti6O13晶须粒径及不同尺寸晶须间的配比关系。研究结果表明，随着K2Ti6O13晶须粒径的减小，K2Ti6O13陶瓷体积密度增大，开孔率和纯水通量随之减小，机械强度逐渐升高。当采用中位粒径为7.50 μm 和1.60 μm的K2Ti6O13晶须以质量比为3:1的比例为原料时，陶瓷物料间形成了大晶须与中细颗粒的搭接，得到了最佳的综合性能，相应的机械强度为42.8±0.2 MPa，开孔率为36.4%，纯水通量为2366 L.m-2.h-1.MPa-1，在分子筛膜领域具有良好的应用前景。

关键词: K₂Ti₆O₁₃晶须, 大孔陶瓷, 粒径, 分子筛膜