摘要
为了在较低烧结温度下获得性能良好的中空平板陶瓷膜,烧结助剂的优化选择至关重要。本文系统探究了锆钛微粉、钾长石微粉、硅溶胶和铝溶胶四种烧结助剂对氧化铝陶瓷膜晶相组成、微观结构、抗折强度、孔隙率、纯水通量、平均孔径、化学稳定性和收缩率的影响。结果表明,不同烧结助剂具有不同的作用机理并形成不同的微观形貌结构。微粉类添加剂对抗折强度的提升效果明显优于溶胶类,其中锆钛微粉在低含量(1~3 wt%),而钾长石微粉在高含量(≥15 wt%)时作用效果显著,但孔隙率随添加量的提高而下降。添加锆钛微粉时膜孔径和纯水通量下降,而添加钾长石微粉时膜孔径增加,纯水通量呈现先升高后下降的趋势。微粉类添加剂陶瓷膜的化学稳定性明显优于溶胶类,但收缩率也较高,且过度添加对生产过程不利,实际应用中应控制在合理范围。
In order to obtain hollow flat-sheet ceramic membrane with good performance at low sintering temperature, the selection of sintering aid agents is essential. The effect of zirconium-titanium powder,potassium feldspar powder, silica sol and aluminum sol on the crystal phase composition, micro-structure,flexural strength, porosity, pure water flux, average pore size, chemical stability and shrinkage of ceramic membrane were systematically investigated in this work. The results showed that different sintering aid agents exhibited different reinforcing mechanisms for the flexural strength and thus forming different microstructure in the resultant ceramic membranes. The effect of powder-type sintering aid agents was obviously better than that of sol-type, in which the effect of zirconium-titanium powder at low content(1 ~ 3 wt%),while potassium feldspar powder at high content( ≥ 15 wt%) was most significant. The porosity decreased with the increase of adding content. For zirconium-titanium, the membrane pore diameter and pure water flux was both decreased;whereas for potassium feldspar, the membrane pore diameter was increased but the pure water flux demonstrated a turning trend with the increase of adding content. The chemical stability of powder additive ceramic membrane was better than that of sol, but higher shrinkage rate was also observed. Excessive addition of powder-type agents was shown not good for the production process in the experiments, which should be controlled within a reasonable range in practical application.
作者
田家宇
樊超
潘慧
尹兴
白钊玉
高珊珊
TIAN Jiayu;FAN Chao;PAN Hui;YIN Xing;BAI Zhaoyu;GAO Shanshan(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjing 3000401,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2023年第7期26-34,共9页
China Ceramics
基金
国家自然科学基金(51978232)
天津市自然科学基金(19JCJQJC63000)
河北省高等学校科学技术研究项目(QN2019022)。
关键词
中空平板陶瓷膜
烧结助剂
抗折强度
孔隙率
化学稳定性
Hollow flat-sheet ceramic membrane
Sintering aid agents
Flexural strength
Porosity
Chemical stability
