Development of Eco-Debinding Process using Supercritical Eztraction of Low Molecular Organic Binders in Ceramic Bodies with Nano-Sized Capillary Structure
(0) Eco-debinding process using supercritical extraction of low molecular organic binders in nano-porous ceramic bodies was examined. The debinding properties related to structural changes during supercritieal extraction and conventional solvent extraction were also compared. The debinding rate of supereritical extraction was significantly enhanced compared to the debinding rate of solvent extraction because of the high diffusivity of the supercfitical carbon dioxide for the low molecular weight wax binder in the molded bodies with nano-sized pore structure, although both debinding rates showed same a square root of time dependence. The extraction rates with morphological changes varied depending on the degree of saturation at the end of debinding stagesBoth the debinding methods experienced morphological changes with a debinding front separating the pendular state region from the undebinded region with fluid state in low molecular paraffin wax based powder compacts during extraction. The capillary structural changes in the green bodies caused severe defects during extraction and degraded the physical properties. In spite of the abrupt changes of the capillary structure, the debinding defect was significantly alleviated for the supercritical debinded ceramic bodies, compared to the solvent extracted bodies.
supercritical debinding solvent eztraction ceramic bodies nano-porous
Sang Woo Kim Jong-Sik Park
Center for Energy Materials Research, Korea Institute of Science and Technology, 39-1 Haweoulgog-don R&D Center, KINORI Co., Ltd, SungNam, Kyonggi 462-807 Korea
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
129-132
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）