Gel casting based on thermal solidification andits interfacisl chemistry for production of defect-free ceramics

基于热凝固及其界面化学的凝胶浇注法生产无缺陷陶瓷

• 批准号: 09650921
• 负责人: UEMATSU Keizo
• 金额: $ 2.11万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650921/
• 关键词: ceramics; forming; slurry; powder; flaws; characterization tools; sintering; interfacial chemistry; 成型; 分散; 界面化学; アルミナ

This research applies the new solidification phenomenon of ceramic slurry, which was found by the present investigator, for the production of ceramic green body. Powerful characterization tools, which were also developed by the present investigators, were applied to examine the structure of the body to made green bodies without flaw. These new approaches are indispensable for developing novel forming method called gel casting based on thermal solidification and also for developing high performance ceramics without flaw.This study shows that alumina green body without large flaws can be formed by the present method. The green body was found to have highly uniform microstructure. The body has high sinterability and was densifled to 98% of theoretical value at a temperature 1OOK below the normal sintering temperature. The sintering temperature may be further reduced by improved homogeneity The solidification mechanism involves the thermal change of interface chemistry between the poly-acrylic acid used as a dispersant and the alumina surface. The increased adsorption due to an apparent endo-thermal heat of adsorption is responsible for the solidification.

本研究将本研究者所发现的陶瓷浆料凝固新现象应用于陶瓷绿色坯体的制造。利用本研究者开发的强大的表征工具来检查身体的结构，以制造无缺陷的绿色身体。这些新方法对于开发基于热固化的凝胶注模成型新方法和开发无缺陷的高性能陶瓷材料是必不可少的，研究表明，本方法可以制备出无大缺陷的氧化铝绿色坯体。发现该绿色体具有高度均匀的微观结构。该坯体具有较高的烧结性能，在低于正常烧结温度100K的温度下烧结致密化至理论值的98%。通过改善均匀性可以进一步降低烧结温度。固化机制涉及用作分散剂的聚丙烯酸与氧化铝表面之间的界面化学的热变化。由于表观吸热吸附热而增加的吸附是固化的原因。

项目成果

L.-C.Guo, Y.Zhang and K.Uematsu: "Heterogenity of Adsorption and Its Impact on the Stability of Aqueous Alumina Suspension with Polyelectrolyte" proceeding for the First China International Conference on High-Performance Ceramics.

L.-C.Guo、Y.Zhang 和 K.Uematsu：“吸附的非均质性及其对聚电解质水性氧化铝悬浮液稳定性的影响”，第一届中国国际高性能陶瓷会议进行中。

L.-C.Guo, Y.Zhang and K.Uematsu: "Heterogenity of Adsorption and Its Impact on the Stability of Aqueous Alumina Suspension wiht Polylectrolyte" Procdeding for the First China International Conference on High-Performance Ceramics.

L.-C.Guo、Y.Zhang 和 K.Uematsu：“吸附的非均质性及其对聚电解质水性氧化铝悬浮液稳定性的影响”，首届中国国际高性能陶瓷会议论文集。

Y.Zhang, L.-C.Guo, N.Uchida and K.Uematsu: "Effect of Temperature on Dispersion of Ceramic Shmy and Its Application in Ceramic Forming" Proceeding for the First China International Conference on.

Y.Zhang、L.-C.Guo、N.Uchida 和 K.Uematsu：“温度对陶瓷 Shmy 分散的影响及其在陶瓷成型中的应用”，首届中国国际会议论文集。

Y.Zhang, N.Uchida and K.Uematsu: "Effect of Dispersion of Ceramic Slurry on structure of Spray Dried Granules and Compacts" Proceeding for CIMTEC982.

Y.Zhang、N.Uchida 和 K.Uematsu：“陶瓷浆料分散对喷雾干燥颗粒和压块结构的影响”，CIMTEC982 论文集。

Y.Zhang, L.-C.Guo, N.Uchida and K.Uematsu: "Effect of Temperature on Dispersion of Ceramic Siurry and Its Application in Ceramic Forming" Proceeding for the First China International Conference on High-Performance Ceramics.

Y.Zhang、L.-C.Guo、N.Uchida 和 K.Uematsu：“温度对陶瓷浆料分散的影响及其在陶瓷成型中的应用”，首届中国国际高性能陶瓷会议论文集。