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Sinter-HIP of polymer-derived Al2O3–SiC composites with high SiC contents

Sedláček, Jaroslav and Galusek, Dušan and Riedel, Ralf and Hoffmann, Michael J. (2011):
Sinter-HIP of polymer-derived Al2O3–SiC composites with high SiC contents.
In: Materials Letters, Elsevier, pp. 2462-2465, 65, (15-16), ISSN 0167577X,
[Online-Edition: http://dx.doi.org/10.1016/j.matlet.2011.04.094],
[Article]

Abstract

Submicrometer Al2O3 composites with more than 20 vol.% of SiC particles were produced using a multiple infiltration of porous bodies with a liquid polymer SiC precursor. The fully dense composites were successfully densified using a sinter-HIP process. Parameters of sintering and HIP steps are discussed with respect to both densification and microstructure evolution of the composites. The initial pressure during the sintering step plays an important role for the preparation of fully dense composites with a submicrometer alumina matrix at 1750 °C. Optimized densification schedule of sinter-HIP represents a novel approach of densification at relatively mild conditions compared to previously reported or common densification methods of Al2O3–SiC composites with high SiC content, such as pressureless sintering, hot pressing and post-HIPing. The method expands the possibilities for preparation of alumina based composites with SiC volume fraction > 20 vol.%, filling the gap in available literature data.

Item Type: Article
Erschienen: 2011
Creators: Sedláček, Jaroslav and Galusek, Dušan and Riedel, Ralf and Hoffmann, Michael J.
Title: Sinter-HIP of polymer-derived Al2O3–SiC composites with high SiC contents
Language: English
Abstract:

Submicrometer Al2O3 composites with more than 20 vol.% of SiC particles were produced using a multiple infiltration of porous bodies with a liquid polymer SiC precursor. The fully dense composites were successfully densified using a sinter-HIP process. Parameters of sintering and HIP steps are discussed with respect to both densification and microstructure evolution of the composites. The initial pressure during the sintering step plays an important role for the preparation of fully dense composites with a submicrometer alumina matrix at 1750 °C. Optimized densification schedule of sinter-HIP represents a novel approach of densification at relatively mild conditions compared to previously reported or common densification methods of Al2O3–SiC composites with high SiC content, such as pressureless sintering, hot pressing and post-HIPing. The method expands the possibilities for preparation of alumina based composites with SiC volume fraction > 20 vol.%, filling the gap in available literature data.

Journal or Publication Title: Materials Letters
Volume: 65
Number: 15-16
Publisher: Elsevier
Uncontrolled Keywords: Ceramics, Alumina, Silicon carbide, Polymer derived, Sintering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Apr 2012 09:19
Official URL: http://dx.doi.org/10.1016/j.matlet.2011.04.094
Identification Number: doi:10.1016/j.matlet.2011.04.094
Funders: The financial support of this work by the European Commission under Marie Curie EIF programme No. 25284, Alexander von Humboldt Foundation, Bonn, Germany, grant APVV LPP 0297–09, This publication is the result of implementation of the project: Centre for materials, layers and systems for applications and chemical processes under extreme conditions — Stage II supported by the Research & Development Operational Programme funded by t
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