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Sintering behavior of an ultrafine alumina powder shaped by pressure filtration and dry pressing

Aminzare, M. and Golestani-fard, F. and Guillon, Olivier and Mazaheri, Mehdi and Rezaie, H. R. (2010):
Sintering behavior of an ultrafine alumina powder shaped by pressure filtration and dry pressing.
In: Materials Science and Engineering: A, pp. 3807-3812, 527, (16-17), ISSN 09215093, [Online-Edition: http://dx.doi.org/10.1016/j.msea.2010.03.051],
[Article]

Abstract

Master sintering curve (MSC) was used as a practical approach to analyse the sintering behavior of an ultrafine alumina powder. Non-isothermal sintering was carried out at three heating rates. The concept of the MSC has been used to investigate the effect of different shaping methods, i.e. dry pressing (DP) and pressure filtration (PF) on the apparent activation energy for sintering. Although no change in the dominant densification mechanism is expected, the interplay between different diffusion mechanisms taking place during the heating ramp may be affected by the shaping method. Values of 605 ± 15 and 700 ± 20 kJ/mol were determined for PF and DP samples, respectively. The lower activation energy for PF samples may be explained by the higher green density and homogeneity, smaller pore size in comparison with the DP samples. Furthermore, the mechanical properties (hardness and fracture toughness) of the samples are presented.

Item Type: Article
Erschienen: 2010
Creators: Aminzare, M. and Golestani-fard, F. and Guillon, Olivier and Mazaheri, Mehdi and Rezaie, H. R.
Title: Sintering behavior of an ultrafine alumina powder shaped by pressure filtration and dry pressing
Language: English
Abstract:

Master sintering curve (MSC) was used as a practical approach to analyse the sintering behavior of an ultrafine alumina powder. Non-isothermal sintering was carried out at three heating rates. The concept of the MSC has been used to investigate the effect of different shaping methods, i.e. dry pressing (DP) and pressure filtration (PF) on the apparent activation energy for sintering. Although no change in the dominant densification mechanism is expected, the interplay between different diffusion mechanisms taking place during the heating ramp may be affected by the shaping method. Values of 605 ± 15 and 700 ± 20 kJ/mol were determined for PF and DP samples, respectively. The lower activation energy for PF samples may be explained by the higher green density and homogeneity, smaller pore size in comparison with the DP samples. Furthermore, the mechanical properties (hardness and fracture toughness) of the samples are presented.

Journal or Publication Title: Materials Science and Engineering: A
Volume: 527
Number: 16-17
Uncontrolled Keywords: Alumina; Master sintering curve; Activation energy; Sintering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Jun 2011 08:36
Official URL: http://dx.doi.org/10.1016/j.msea.2010.03.051
Identification Number: doi:10.1016/j.msea.2010.03.051
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