文档介绍：粉体粒度对硅藻土基微孔陶瓷结构和性能的影响
高如琴?,郑水林,许辉,张娟
(中国矿业大学化学与环境工程学院,北京100083)
摘要:以硅藻土为主要原料,采用固相烧结法,制备了硅藻土基微孔陶瓷,探讨了粉体粒度对其比表面积、烧结样品的孔径及其分布、孔隙率等性能的影响。结合SEM、BET、压***仪等手段对样品进行了表征。结果表明:在d50=~,烧结样品的平均孔径及孔隙率下降,粉体比表面积上升;其后孔径分布变宽并出现团聚;d50=,,,%;对孔雀石绿溶液的脱色研究结果表明,随粉体粒度的减小,多孔陶瓷的脱色能力增强,但d50≤,反应7h,d50=%。关键词:硅藻土;粉体粒度;微孔陶瓷;结构与性能;脱色率
图书分类号:TM285 文献标识码:A 2
Effect of powder size on microstructure and properties of
diatomite based micro-porous ceramic
GAO Ru-qin,ZHENG Shui-lin,XU Hui,ZHANG Juan
(School of Chemical and Environmental Engineering, China University of Mining& Technology,Beijing100083, China) Abstract:In this paper, the diatomite-based micro-porous ceramic whose specific surface area of powder is , mean pore size is , and the porosity is %
respectively was prepared by solid-phase sintering method using diatomite as raw material and ground to median powder size . And the effect of powder size on microstructure and properties of samples, such as, specific surface area, mean pore size and porosity, has been investigated in details. The samples were characterized by SEM, BET, mercury intrusion porosimetry and so on. The mean pore size and porosity of the samples fired decrease largely and specific surface area increase with powder size reduction, thenceforth, the pore size distribution range es wider and appears conglomeration; Discoloration research on the malachite-green indicates that discoloration capacity of porous ceramic buildups with powder size descending es to % in 7h and d50=, but the change is relatively slight after d50=.
Key words:diatomite;powder size;micro-porous ceramic;microstructure and properties;discoloration rate
1 引言
微孔陶瓷是指在陶瓷内部或表面含有大量开口或闭口微小气孔的陶瓷体,其孔径一般为微米级或亚微米级。微孔陶瓷的吸附性、透气性、耐腐蚀性、环境相容性等已引起人们的普遍关注。在过去的几十年里人们采用不同的技术和原料研制出各种各样的微孔陶瓷,但目前商业化的微孔陶瓷主要来源于纯的陶瓷粉体,包括氧化铝、碳化硅、氧化锆和莫来石等。然而,由于原材料价格和高烧结温度导致的高生产成本,限制了其在诸多方面的推广应用[1-3]。天然