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Effects of powder bed conditions on the liquid-phase sintering of Si3N4

Published online by Cambridge University Press:  31 January 2011

Sea-Hoon Lee ,
Georg Rixecker ,
Fritz Aldinger ,
Sung-Churl Choi  and
Keun-Ho Auh
Sea-Hoon Lee
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Georg Rixecker
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Fritz Aldinger
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Sung-Churl Choi
Affiliation:
Department of Ceramic Engineering, Hanyang University, # 17, Haengdang-dong, Sungdong-Gu, Seoul 133–791, Korea
Keun-Ho Auh
Affiliation:
Department of Ceramic Engineering, Hanyang University, # 17, Haengdang-dong, Sungdong-Gu, Seoul 133–791, Korea
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Abstract

The effects of the active and passive protection mechanisms of powder beds on the sintering of Si3N4 were investigated. Shrinkage, density, and coloring behavior of sintered samples were analyzed using different compositions and packing conditions of powder beds based on BN and Si3N4 with different additives. Y2O3 additive in the powder bed influences the weight change and phase formation behavior of the samples, although it has a very low vapor pressure at the sintering temperature. When MgO/Y2O3 was used as sintering additives, the packing density and thickness of the powder bed had a much stronger effect than in the case of Al2O3/Y2O3. For the optimization of the powder bed conditions, the vapor pressure and chemical stability of sintering additives at the sintering temperature has to be considered.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 2 , February 2002 , pp. 465 - 472
Copyright
Copyright © Materials Research Society 2002

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References

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