Drying mechanisms and stress development in aqueous alumina tape casting |
| |
| Affiliation: | 1. UMR-CNRS 6638, SPCTS-ENSCI, Laboratoire Science des Procédés Céramiques et de Traitements de Surface, 47 Avenue Albert Thomas, Limoges Cedex 87065, France;2. Groupe d’Étude des Matériaux Hétérogènes (GEMH), ENSCI, Limoges Cedex 87065, France;3. Aluminium Pechiney, BP54, 13541 Gardanne, France;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;1. Epstein Department of Industrial and Systems Engineering, University of Southern California, Los Angeles, CA, USA;2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, China;1. College of Physical Science and Technology, Sichuan University, Chengdu 610064, Sichuan, PR China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, PR China;3. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, PR China;4. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA |
| |
| Abstract: | Mass loss, shrinkage, Young’s modulus evolution and stress development of aqueous (alumina + latex) tape cast suspensions were observed during drying. Mass loss showed a constant drying rate period, followed by a falling rate period. Concurrently a linear shrinkage rate has been observed in the thickness direction, up to a drying point after which shrinkage abruptly stops. End of constant drying rate and end of shrinkage were not necessarily concomitant and depend on the latex/alumina ratio in the tape. A Young’s modulus value appears in the tape cast suspensions at the transition from liquid to solid like state. Then an increase of Young’s modulus is observed corresponding to latex film formation. The stresses generated by drying in the tape exhibited a first period of increase due to capillary pressure in the pores, a small relaxation immediately followed by a second stress increase due to latex film formation, and a stress plateau at the end of latex coalescence. Alumina powder granulometry and surface tension of the liquid had a preponderant influence on the first stress maximum whereas the properties of the latex and the drying conditions dominated the second stress maximum. By increasing latex proportion up to 25 wt.% on alumina basis, it was possible to make the first and the second stress rise concomitant. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
