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Development of Debindering Process of Molded New Ceramics Using Supercritical Fluid

超临界流体模压新型陶瓷脱脂工艺的发展

基本信息

批准号：
02650692
负责人：
MASUOKA Hirokatsu
金额：
$ 1.47万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650692/
关键词：
Supercritical Fluid New Ceramics Binder Extraction Carbon Dioxide Phase Equilibrium Diffusion Coefficient Equation of State 超臨界流体抽出射出成形脱脂溶解度

项目摘要

In this work, supercritical fluid (SCF) extraction technique was applied to the debindering process of molded new ceramics, and following results were obtained :1. Binder extraction experiments were carried out from molded new ceramics to search the binder components which were suitable for the SCF debindering. As a result, it was found that paraffin waxes with a low melting point temperature were suitable as low-molecular weight binder components, and thermoplastic resins with a low melting point temperature and a low glass transition temperature were suitable as high-molecular weight ones. In addition, the debindering process time could be reduced to a great extent by the SCF debindering compared with that by conventional thermal decomposition method.2. SCF debindering experiments were carried out by joint use of activated carbon to reduce the debindering process time further and to cut down the quantity of needed SCF. As a result, high extraction yields were obtained without flowing SCF through the extraction cell since binder concentrations in the SCF phase were maintained at small values due to the adsorption of extracted binders on the activated carbon.3. The results of extraction yields were correlated by a model which considers only diffusion of the binder components in the green body as a mass transfer resistance. The debindering rates and the concentration distributions of the binder components in the green body could be satisfactorily correlated by Fick's diffusion equation.4. The debindered samples were sintered and tested for bending strength. The bending strength of the sintered products which were debindered by the SCF extraction method was as high as that of those produced by the conventional method.

本文将超临界流体萃取技术应用于新型陶瓷成型坯体的脱脂过程，取得了以下研究成果：1。从成型的新陶瓷中进行了粘结剂提取实验，以寻找适合于超临界流体脱脂的粘结剂组分。结果发现，具有低熔点温度的石蜡适合作为低分子量粘合剂组分，具有低熔点温度和低玻璃化转变温度的热塑性树脂适合作为高分子量粘合剂组分。此外，与传统的热分解法相比，超临界流体脱脂法可以在很大程度上缩短脱脂时间.通过联合使用活性炭进行超临界流体脱脂实验，进一步缩短脱脂时间，减少超临界流体用量。结果，在不使SCF流动通过萃取池的情况下获得高的萃取产率，因为由于萃取的粘合剂吸附在活性炭上，SCF相中的粘合剂浓度保持在小的值。提取产率的结果通过仅考虑粘合剂组分在绿色体中的扩散作为传质阻力的模型关联。用Fick扩散方程可以很好地关联脱脂速率和绿色坯体中粘结剂组分的浓度分布.烧结脱粘合剂的样品并测试弯曲强度。用超临界流体萃取法脱粘的烧结制品的抗弯强度与用常规方法生产的制品一样高。