The influence of ageing on consolidation and sinterability of a sub-micron alumina powder

K. Ghillányová; D. Galusek; M. Pentrák; J. Madejová; I. Bertóti; J. Szépvölgyi; P. Šajgalík

doi:10.1016/j.powtec.2011.08.034

The influence of ageing on consolidation and sinterability of a sub-micron alumina powder

K. Ghillányová, D. Galusek, M. Pentrák, J. Madejová, I. Bertóti, J. Szépvölgyi, P. Šajgalík

Research output: Contribution to journal › Article › peer-review

Abstract

A commercial sub-micron alumina powder was used for investigation of the influence of exposure to atmospheric humidity on powder characteristics, consolidation behaviour, densification and final microstructure of alumina ceramics. A significant uptake of atmospheric water by inadequate storage confirmed by thermal analysis, XPS, and FTIR, resulted in decreased sinterability of the powder, although no significant influence on the mean size of alumina grains was observed. In addition, the effect of low temperature heat treatment (drying at 120°C and calcination at 700°C) was also studied. The sinterability of pre-dried powder increased if a wet consolidation method (pressure filtration) was used, but a negative effect of pre-drying was observed in case of dry forming (axial pressing). The calcination decreased the ability of the powder to adsorb water. The presence of aggregates formed by calcination markedly decreased the green and sintered densities in compacts consolidated by axial pressing.

Original language	English (US)
Pages (from-to)	313-321
Number of pages	9
Journal	Powder Technology
Volume	214
Issue number	3
DOIs	https://doi.org/10.1016/j.powtec.2011.08.034
State	Published - Dec 25 2011
Externally published	Yes

Keywords

Ageing
Alumina
Calcination
FTIR spectroscopy
Sintering
XPS

ASJC Scopus subject areas

General Chemical Engineering

Online availability

10.1016/j.powtec.2011.08.034

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title = "The influence of ageing on consolidation and sinterability of a sub-micron alumina powder",

abstract = "A commercial sub-micron alumina powder was used for investigation of the influence of exposure to atmospheric humidity on powder characteristics, consolidation behaviour, densification and final microstructure of alumina ceramics. A significant uptake of atmospheric water by inadequate storage confirmed by thermal analysis, XPS, and FTIR, resulted in decreased sinterability of the powder, although no significant influence on the mean size of alumina grains was observed. In addition, the effect of low temperature heat treatment (drying at 120°C and calcination at 700°C) was also studied. The sinterability of pre-dried powder increased if a wet consolidation method (pressure filtration) was used, but a negative effect of pre-drying was observed in case of dry forming (axial pressing). The calcination decreased the ability of the powder to adsorb water. The presence of aggregates formed by calcination markedly decreased the green and sintered densities in compacts consolidated by axial pressing.",

keywords = "Ageing, Alumina, Calcination, FTIR spectroscopy, Sintering, XPS",

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note = "Funding Information: The financial support of this work by the grant APVV No 0485–06, and by the grants VEGA 1/0603/09 and 2/0036/10 is gratefully acknowledged. This publication was created in the frame of the project “Centre for materials, layers and systems for applications and chemical processes under extreme conditions” supported by the Research and Development Operational Program funded from the European Regional Development Fund .",

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AU - Bertóti, I.

AU - Szépvölgyi, J.

AU - Šajgalík, P.

N1 - Funding Information: The financial support of this work by the grant APVV No 0485–06, and by the grants VEGA 1/0603/09 and 2/0036/10 is gratefully acknowledged. This publication was created in the frame of the project “Centre for materials, layers and systems for applications and chemical processes under extreme conditions” supported by the Research and Development Operational Program funded from the European Regional Development Fund .

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Y1 - 2011/12/25

N2 - A commercial sub-micron alumina powder was used for investigation of the influence of exposure to atmospheric humidity on powder characteristics, consolidation behaviour, densification and final microstructure of alumina ceramics. A significant uptake of atmospheric water by inadequate storage confirmed by thermal analysis, XPS, and FTIR, resulted in decreased sinterability of the powder, although no significant influence on the mean size of alumina grains was observed. In addition, the effect of low temperature heat treatment (drying at 120°C and calcination at 700°C) was also studied. The sinterability of pre-dried powder increased if a wet consolidation method (pressure filtration) was used, but a negative effect of pre-drying was observed in case of dry forming (axial pressing). The calcination decreased the ability of the powder to adsorb water. The presence of aggregates formed by calcination markedly decreased the green and sintered densities in compacts consolidated by axial pressing.

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The influence of ageing on consolidation and sinterability of a sub-micron alumina powder

Abstract

Keywords

ASJC Scopus subject areas

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