粒径对K_2Ti_6O_(13)大孔陶瓷的制备及性能影响  

Effect of particle size of whiskers on preparation and properties of macroporous K_2Ti_6O_(13) ceramics

作　　者：杨祝红[1] 黄大华[1] 陈闪山[1] 仇龙云[1] 蒙萌[1] 陆小华[1] 冯新[1] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009

出　　处：《化工学报》2012年第2期626-633,共8页CIESC Journal

基　　金：国家自然科学基金重点项目(20736002);国家自然科学基金委员会与香港研究资助局联合科研基金(20731160614);国家自然科学基金(20976080);国家高技术研究发展计划项目(2006AA03Z455);江苏省高技术研究项目(BG2007051);江苏省产学研联合创新资金(BY2009107)~~

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7.50μm和1.60μm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±0.2MPa,开孔率为36.4%,纯水通量为2366L.m-2.h-1.MPa-1,在分子筛膜领域具有良好的应用前景。The K2Ti6O13 macroporous ceramics were prepared by the 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 accumulation of whiskers with different sizes.The relationship among particle size,ratios of whiskers with different particle sizes and properties of permeability and bending strength of porous K2Ti6O13 ceramics were investigated.The results showed that the bulk density and bending strength of K2Ti6O13 porous ceramics increased with the decrease of particle size of K2Ti6O13 whiskers,while the behavior of porosity and permeability was the opposite.When K2Ti6O13 porous ceramics were prepared by using accumulation of K2Ti6O13 whiskers with different sizes whose length was D50=7.50 μm and 1.60 μm,the corresponding mass ratio was 3∶1,the framework of K2Ti6O13 ceramics were connected with the long whiskers and the medium or small particles.The K2Ti6O13 ceramics exhibited optimal properties as follows： bending strength of 42.8±0.2 MPa,pure water flux of 2366 L·m-2·h-1·MPa-1 and open porosity of 36.4%,respectively.The performance of K2Ti6O13 porous ceramics prepared from whiskers with different sizes was better than that of ceramics with uniform whiskers in terms of permeability and bending strength.This material showed excellent potential in the area of molecular sieve membrane.

关 键 词：K2Ti6O13晶须 大孔陶瓷 粒径 分子筛膜 

分 类 号：TQ174[化学工程—陶瓷工业]