粒径分布对氧化铝多孔支撑体孔结构的影响  

Effect of particle size distribution of raw powders on the pore structure of macroporous alumina supports

作　　者：丁贯保[1] 漆虹[1] 邢卫红[1] 

机构地区：[1]南京工业大学膜科学技术研究所,省部共建材料化学工程教育部重点实验室,南京210009

出　　处：《膜科学与技术》2008年第5期23-27,共5页Membrane Science and Technology

基　　金：国家基础研究计划(973项目,2003CB615700);国家自然科学基金重点项目(20436030);江苏省高校自然科学研究计划(04KJB530043)

摘　　要：采用中位粒径（D50）分别为（20±2）μm、（15±2）μm、（10±2）μm的α-Al2O3粉体为原料，通过调整其粒径分布，考察了粒径分布参数占的变化对片状支撑体孔结构的影响．研究表明，在本研究的三种中位粒径（D50）下，当δ〈4．0时，随δ值的增大，支撑体的孔隙率由40％下降到30％左右；当δ〉4．0以后，支撑体的孔隙率基本稳定在28％．对于采用中位粒径分别为（20±2）μm和（15±2）μm的原料制备的支撑体，当艿〈3．0时，随δ值的增大，支撑体的平均孔径分别从3．5μm减小到1．1μm，从2．0μm减小到1．3μm；而对D50为（10±2）μm的原料制备的支撑体，δ在1．5～8．0范围内变化时，支撑体的平均孔径基本稳定在0．8μm．采用中位粒径D50为（20±2）μm、（15±2）μm、（10±2）μm的三种原料制备的支撑体，随δ值的增大，其孔径分布变窄，最可几分布峰高变高，分布向小孔径方向移动．Different particle size distributed alumina with mean particle sizes of （20± 2）μm, （15 ± 2） μm and （10 ± 2） μm respectively, was prepared by using various alumina powders. The disc supports were also prepared according to the above mentioned alumina powders by dry pressing method. The mean particle size （D50） and parameter 8 were used to quantitively represent the particle size distribution （PSD） of alumina powders（with respect to three kind of alumina powders with Ds0 of （20 ± 2） μm, （15 ± 2） μm and （10± 2）μm respectively）, when the parameter δ was less than 4.0, the porosity of the supports decreased from 40 % to 30 % with the increasing of parameter δ. However, when the parameter δ was greater than 4.0, the porosity was stabilized at 28%. As for supports prepared by powders with different mean particle size of （20 ± 2）μm and （15 ± 2） μm respectively, when the parameter δ was less than 3.0, pore size of the supports decreased from 3.5μm, 2.0 μm to 1.1μm, 1.3μm, respectively. When the supports were prepared by alumina powders with mean particle size of （10 ±2）μm, the mean pore size of such supports was stabilized at 0.8μm as the parameter δ varied from 1.5 to 8.0. What＇s more, the greater of the δ value, the narrower of pore size distribution of porous alumina supports studied in this paper. Meanwhile the peak height of pore size distribution became higher and the pore size distribution shifted to smaller pore size.

关 键 词：无机膜 多孔支撑体 氧化铝 粒径分布 

分 类 号：TB383.2[一般工业技术—材料科学与工程]