DEVELOPMENT OF NEW SLURRY CHARACTERIZATION TECHNIQUE FOR OPTIMIZING MICROSTRUCTURE DESIGNED IN SHAPING PROCESS

开发新的浆料表征技术以优化成形过程中设计的微观结构

• 批准号: 07555578
• 负责人: TSUBAKI Jun-ichiro
• 金额: $ 4.99万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555578/
• 关键词: CERAMICS; SHAPING; SLURRY; SPRAY DRYING; VISCOSITY; SLIP CASTING; MICROSTRUCTURE; GRANULE

For the purpose of characterizing slurry suspension applied in fine ceramics shaping process, developed has been an evaluation technique, centrifugal consolidation method, in which the mechanical properties of slurry are measured methodically by controlling the centrifugal effect. It has been demonstrated by performing experiments on slip-casting and die-press compaction under the various conditions of slurry preparation, that the centrifugal consolidation method is available for designing characteristics of slurry in order to control microstructures in green compacts. On the basis of the experimental results, an unique apparatus has been designed and constructed, which measures time changes in balancing moment stemming from the centrifugal consolidation of particles.The slurry with high solids content is readily forced to form a particle network structure at the threshold, the formation mechanism of which originates in a slight dehydration of slurry. The critical solids content for th … More e network structure has been found to be as low as several vol%. It is demonstrated that it exists a relation between the centrifugal consolidation stress and the packing fraction, and that t0his relation can be interpreted to characterize the mechanical strength of the formed network structure, on which the solids content and the degree of flocculation exert a significant influence. It is also shown that the formation mechanism of microstructure in slip-casting process should be characterized by the transient behavior of filtrate and that the agglomerate structure, stemming directly from the interparticle forces between particles, significantly exerts an influence on the homogeneity of the formed green compacts.Characteristic transient behavior of compaction process for spray-dried granules, have been investigated by using the compaction and stress-relaxation technique. Attention has been paid to the microstructure of granules as well as slurry characteristics, in order to identify the main factor governing the formation mechanism of granules. It is shown that the shape forming process is reasonably explained with the shrinkage process of spray-dried droplets, characteristics of which are methodically evaluated by applying the centrifugal consolidation method. Less

为了表征精细陶瓷成型工艺中浆料悬浮体的性能，发展了一种通过控制离心作用来系统地测量浆料力学性能的评价技术--离心固结法。通过在不同的浆料制备条件下进行注浆成型和模压成型试验，证明了离心固结法可用于设计浆料的特性，以控制绿色坯体的微观结构。在实验的基础上，设计并建造了一套独特的装置，用于测量颗粒离心固结过程中平衡力矩随时间的变化，高固相含量的浆体在临界值处容易形成颗粒网络结构，其形成机理源于浆体的轻微脱水。临界固体含量 ...更多信息 已经发现网络结构低至几体积%。结果表明，离心固结应力与填料体积分数之间存在着一定的关系，这种关系可以用来表征所形成的网络结构的机械强度，而固体含量和絮凝程度对这种结构的机械强度有着重要的影响。研究还表明，注浆成型过程中微观结构的形成机制应以滤液的瞬态行为为特征，而直接由颗粒间力引起的团聚结构对所形成的绿色坯体的均匀性有显著影响。已经通过使用压实和应力松弛技术进行了研究。注意颗粒的微观结构以及浆料的特性，以确定控制颗粒形成机理的主要因素。结果表明，形状的形成过程是合理的解释与喷雾干燥液滴的收缩过程，其特点是有系统地评估应用离心固结法。少

项目成果

椿 淳一郎: "湿式成形プロセス最適設計のための新たなスラリー評価法-遠心圧密挙動の遠心効果依存性" 日本セラミックス協会学術論文誌. 106・6(印刷中). (1998)

Junichiro Tsubaki：“湿式成型工艺优化设计的新浆料评估方法 - 离心固结行为的离心效应依赖性”，日本陶瓷学会杂志 106，6（出版中）。

Tsubaki, J., et al: "A New Slurry Characterization Technique for Optimizing Wet-Shaping Process, 1-Transient Centrifugal Consolidation Process of Particulate Slurries" J.Ceram.Soc.Japan. vol.106 (5), (in press). (1998)

Tsubaki, J. 等人：“一种用于优化颗粒浆料的湿成型过程、1-瞬态离心固结过程的新浆料表征技术”J.Ceram.Soc.Japan。