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Synthesis and structural and mechanical properties of nanobioceramic (α-Al2O3)

Synthesis and structural and mechanical properties of nanobioceramic (α-Al2O3) The structural and mechanical properties of the nanostructured alpha-alumina (α-Al2O3) compact powders, formed by calcination of aluminum hydroxide (Al2(OH)6) gibbsite at different temperatures (100–1100 °C), followed by uniaxial pressing and subsequently hot isostatically pressed (HIP), were investigated using X-ray diffraction, scanning electron microscopy (SEM), and type ball-on-disk oscillating tribometer. X-ray diffraction analysis indicates that the transformation sequence involves the formation of κ-Al2O3 as an intermediate phase between χ- and α-Al2O3. The crystallite size of calcined alumina (α-Al2O3) was as small as 8 nm after calcination at 1100 °C. The sliding friction and wear rate were lower in the nanocrystalline samples calcined at 1100 °C at same applied load (3, 6, or 10 N). The enhanced friction and wear resistance were endorsed to have fin microstructure similar to the sample calcined at 1100 °C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Synthesis and structural and mechanical properties of nanobioceramic (α-Al2O3)

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Publisher
Springer Journals
Copyright
Copyright © 2019 by Australian Ceramic Society
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Materials Engineering; Inorganic Chemistry
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-019-00333-7
Publisher site
See Article on Publisher Site

Abstract

The structural and mechanical properties of the nanostructured alpha-alumina (α-Al2O3) compact powders, formed by calcination of aluminum hydroxide (Al2(OH)6) gibbsite at different temperatures (100–1100 °C), followed by uniaxial pressing and subsequently hot isostatically pressed (HIP), were investigated using X-ray diffraction, scanning electron microscopy (SEM), and type ball-on-disk oscillating tribometer. X-ray diffraction analysis indicates that the transformation sequence involves the formation of κ-Al2O3 as an intermediate phase between χ- and α-Al2O3. The crystallite size of calcined alumina (α-Al2O3) was as small as 8 nm after calcination at 1100 °C. The sliding friction and wear rate were lower in the nanocrystalline samples calcined at 1100 °C at same applied load (3, 6, or 10 N). The enhanced friction and wear resistance were endorsed to have fin microstructure similar to the sample calcined at 1100 °C.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Mar 27, 2019

References