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Novel precursor-derived Al–C–N–(O)-based ceramic additive for the low-temperature pressureless sintering of silicon nitride

Published online by Cambridge University Press:  31 January 2011

Sea-Hoon Lee ,
Markus Weinmann ,
Peter Gerstel ,
Georg Rixecker ,
Sung-Churl Choi  and
Fritz Aldinger
Sea-Hoon Lee*
Affiliation:
Max Planck Institute for Metal Research and Institute for Non-metallic Inorganic Materials, University of Stuttgart, D-70569 Stuttgart, Germany; and Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
Markus Weinmann
Affiliation:
Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
Peter Gerstel
Affiliation:
Max Planck Institute for Metal Research and Institute for Non-metallic Inorganic Materials, University of Stuttgart, D-70569 Stuttgart, Germany
Georg Rixecker
Affiliation:
Max Planck Institute for Metal Research and Institute for Non-metallic Inorganic Materials, University of Stuttgart, D-70569 Stuttgart, Germany
Sung-Churl Choi
Affiliation:
Ceramic Processing Research Center, Hanyang University, Sungdong-Gu, Seoul 133-791, Korea
Fritz Aldinger
Affiliation:
Max Planck Institute for Metal Research and Institute for Non-metallic Inorganic Materials, University of Stuttgart, D-70569 Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: LEE.Seahoon@nims.go.jpCurrent address: National Institute for Material Science, Material Engineering Laboratory, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
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Abstract

A polymer, which by pyrolysis transforms into Al–C–N–(O) ceramics, was synthesized from trimethylamine alane and cyan amide, and its applicability as a sintering additive for Si3N4 was investigated. Si3N4 powders were mixed with the precursor by treatment with organic slurries of the precursor to induce the homogeneous distribution of the additive. The green-bodies were pretreated in air or NH3 at 800 °C to control the chemical composition of the additive, through which the densification of Si3N4 could be improved. Dense samples with very fine grains (<2 μm) were obtained after sintering at 1600 °C in 0.1 MPa N2. Besides silicon nitride, submicrometer silicon carbide particles were observed in the samples, indicating that this procedure (i.e., the use of this novel sintering additive) also allows for the fabrication of SiC–Si3N4 composites.

Keywords

AdditivesNitridePolymer

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Type
Articles
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Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1713 - 1721
Copyright
Copyright © Materials Research Society 2008

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