陶瓷悬浮液屈服应力的影响因素研究  

Study on Influencing Factors of Yield Stress in Ceramic Suspensions

作　　者：鲍志蕾 张军剑[1] 于欢 BAO Zhi-lei;ZHANG Jun-jian;YU huan(School of Materials,Jiangxi Arts&Ceramics Technology institute,Jingdezhen 333400,China;Faculty of Humanities,Jingdezhen University,Jingdezhen 333400,China)

机构地区：[1]江西陶瓷工艺美术职业技术学院材料学院,景德镇333400 [2]景德镇学院人文学院,景德镇333400

出　　处：《中国陶瓷》2024年第11期22-29,共8页China Ceramics

基　　金：景德镇市科技局项目(20224GY011-02,2023PTJS001);江西省教育厅科技项目(GJJ2205601);景德镇陶瓷大学研究生创新项目(JYC202132)。

摘　　要：陶瓷悬浮液的稳定性受流变性能的调控,其中屈服应力作为流变性能的重要参数之一,是悬浮稳定的关键因素。研究表明,陶瓷悬浮液的屈服应力主要受颗粒体积分数、粒径和粒径分布等因素影响,在最佳分散状态下屈服应力与固体颗粒体积分数、颗粒粒径存在关系式:τ_(y)=KΦ_(s)^(3.4)/d^(1.6)。然而对于存在粒径分布的陶瓷悬浮液,屈服应力与颗粒粒径建立的相互关系存在数据离散性。引入较细颗粒的单位体积颗粒数n t对该关系式进行了修正,结果表明n t是一个更合适的参数,因为细颗粒控制着絮凝网络结构的基本性质。利用粒径分布中d_(15)以下的单位体积颗粒数n t代替颗粒体积分数Ф_(s),使得屈服应力与颗粒粒径线性相关性得到提升。The stability of ceramic suspensions is regulated by their rheological properties,among which the yield stress serves as an important parameter of rheological properties and is a key factor for suspension stability.This research indicates that the yield stress of ceramic suspensions is primarily influenced by factors such as particle volume fraction,particle size,and particle size distribution.In the optimal dispersion state,there exists a correlation between the yield stress and the solid particle volume fraction as well as the particle size,shown as follows:τ_(y)=KΦ_(s)^(3.4)/d1.6.However,for ceramic suspensions with particle size distribution,there is a data discreteness in the correlation between yield stress and particle size.The introduction of the number of finer particles per unit volume,represented as n t,allows for a modification of the relationship.The results indicate that n t is a more suitable parameter,as finer particles control the fundamental properties of the flocculation network structure.Substituting the number of finer particles per unit volume n t for the particle volume fractionФ_(s) below d_(15) in the particle size distribution has improved the linear correlation between yield stress and particle size.This research holds significant guiding implications for the further study of the stability of ceramic suspensions.

关 键 词：陶瓷悬浮液 屈服应力 体积分数 粒径 粒径分布 

分 类 号：TQ174.13[化学工程—陶瓷工业]