摘要
通过透射电子显微镜(TEM)、X射线光电子能谱(XPS)和Zeta电位分析仪等方法,研究了电解质浓度和pH值对精密铸造用弱碱性硅溶胶稳定性的作用。研究结果表明,随着电解质浓度的增加,硅溶胶的稳定时间显著缩短,胶凝速度加快,并且根据动力学分析,K^(+)比Na^(+)更容易引起硅溶胶的凝聚。在pH值为6.0至9.0范围内,由于胶粒表面存在足够的静电排斥力,硅溶胶能够比较稳定地存在。然而,当pH值低于4.0或高于10.0时,H^(+)浓度的波动会减弱胶体粒子之间的静电排斥力,导致硅溶胶的稳定性下降。综上所述,电解质浓度和pH值对硅溶胶的稳定性有显著影响,研究结果为优化精密铸造工艺提供了重要的理论依据。
The effects of electrolyte concentration and pH value on the stability of weakly alkaline silica sol for precision casting were studied using transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and Zeta potential analyzer.The results showed that as the electrolyte concentration increased,the stability time of the silica sol significantly shortened,and the gelling speed accelerated.Kinetic analysis indicated that the coagulation ability of K^(+)was greater than that of Na^(+).Within the pH range of 6.0 to 9.0,the silica sol remained relatively stable due to sufficient electrostatic repulsion on the surface of the colloidal particles.However,when the pH value was below 4.0 or above 10.0,the changes in H+concentration weakened the electrostatic repulsion between the colloidal particles,thereby reducing the stability of the silica sol.In conclusion,electrolyte concentration and pH value significantly affect the stability of silica sol,and the research findings provide important theoretical support for optimizing precision casting processes.
作者
王帅
吕永乐
王磊
WANG Shuai;LYU Yongle;WANG Lei(School of Materials Science and Engineering,University of Science and Technology Beijing,Haidian 100083,China)
出处
《功能材料》
北大核心
2025年第5期5220-5225,共6页
Journal of Functional Materials
基金
陶瓷型壳浆料失效演变机理与影响机制研究分析与测试(2023-0048)。
关键词
硅溶胶
稳定性
影响因素
电解质浓度
PH值
silica sol
stability
influencing factors
electrolyte concentration
pH value
