期刊
CERAMICS INTERNATIONAL
卷 39, 期 7, 页码 7551-7556出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.03.007
关键词
Mechanical properties; Porous ceramics; PVP; Microstructure
资金
- National Center of Excellence in Desalination Australia
- Australian Government through the Water for the Future initiative
- Australian Research Council
The effect of the solvent on the properties of porous alumina ceramics was studied when polyvinylpyrrolidone (PVP) was used as an organic pore-former. In particular, porous alumina ceramics were produced by dry-pressing of mixed PVP alumina powder; the mixing of PVP and alumina powder was achieved via ball milling using water or acetone as solvent, or dry ball milling. Due to the different solubility of PVP in water and acetone, porous alumina ceramics with different pore structures and mechanical properties were obtained. Because of its cylindrical pores being aligned to some extent, the sample prepared using acetone as solvent exhibited the highest bending strength (140.2 MPa) and Young's modulus (57.4 GPa), which were 1.6 times and 3.4 times higher compared to that prepared without PVP. Moreover, the addition of PVP via wet ball milling led to more uniform dispersion of PVP in alumina, hence limiting the grain growth during sintering process and increasing the grain bonding. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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