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Modified-starch consolidation of Alumina Ceramics

Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 558-561页

作者： JU Chenhui WANG Yanmin YE Jiandong HUANG Yun Key Laboratory of Specially Functional Materials of Ministry of Education and School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China School of Light Industry and Food Science South China University of Technology Guangzhou 510641 China

The alumina ceramics with the homogeneous microstructure and the higher density were fabricated via the modified-starch consolidation process by 1.0 wt% of a modified starch as a consolidator/ binder. The swelling behavior of the modified oxidized tapioca starch was analyzed by optical microscope, and two other corn starches （common corn starch and high amylose corn starch） were also analyzed for comparison. The modified starch used as a binder for the consolidation swelled at about 55 ℃, began to gelatinize at 65 ℃ and then was completely gelatinized at 75 ℃. But the corn starches could not be completely gelatinized even at 80 ℃ for 1 h. The high-strength green bodies （10.6 MPa） with the complex shapes were produced. The green bodies were sintered without any binder burnout procedure at 1 700 ℃ and a relative density of 95.3% was obtained for the sintered bodies, which is similar to that of the sintered sample formed by conventional slip casting. In addition, the effect of temperature on the apparent viscosity of the starch/alumina slurry in the process was investigated, and the corresponding mechanism for the starch consolidation was discussed.

关键词： oxidized starch gelation alumina ceramic starch consolidation

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