Water-assisted cold isostatic pressing to enhance sinterability of alumina ceramics |
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| Authors: | Milad Kermani Vaclav Pouchly Yong Lin Chunfeng Hu Salvatore Grasso |
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| Affiliation: | 1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China;2. CEITEC BUT, Brno University of Technology, Brno, Czech Republic |
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| Abstract: | Water-Assisted cold isostatic Pressing (WAP) enabled pressure-less sintering of fine grained (0.6 μm) and nearly full dense (99.3%) weakly translucent alumina ceramics. As a term of comparison, Dry Pressed (DP) samples, prepared under identical processing conditions, maintained an opaque appearance, and their relative density did not exceed 97.7%. The enhanced compaction of WAP allowed to lower the sintering temperature down to 1350°C, which is approximately 100–150°C lower than that of DP powder. WAP samples resulted in an apparent activation energy for sintering (640 kJ/mol) matching literature values, confirming that the enhanced sinterability was attributed to an improved green density rather than a change in sintering mechanisms. |
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| Keywords: | alumina green density low temperature sintering |
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