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Silicon nitride nanoceramics densified by dynamic grain sliding

Published online by Cambridge University Press:  31 January 2011

Mathias Herrmann ,
Zhijian Shen ,
Ingrid Schulz ,
Jianfeng Hu  and
Bostjan Jancar
Mathias Herrmann
Affiliation:
Fraunhofer Institute of Ceramic Technologies and Sintered Materials, Dresden D-01277, Germany
Zhijian Shen*
Affiliation:
Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 92 Stockholm, Sweden
Ingrid Schulz
Affiliation:
Institut für Werkstoffwissenschaft, Technical University of Dresden, Dresden D-01307, Germany
Jianfeng Hu
Affiliation:
Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 92 Stockholm, Sweden
Bostjan Jancar
Affiliation:
Jozef Stefan Institute, Advanced Materials Department K-9, Jamova 39, SI-1000 Ljubljana, Slovenia
*
a)Address all correspondence to this author. e-mail: shen@mmk.su.se
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Abstract

The densification behaviors of two silicon nitride nanopowder mixtures based respectively on α-Si3N4 and β-Si3N4 as the major phase constituent were studied by spark plasma sintering. Sintering conditions were established where a low viscous liquid not in equilibrium with the main crystalline constituent(s) stimulated the grain sliding yet did not activate the reprecipitation mechanism that unavoidably yields grain growth. By this way of dynamic grain sliding full densification of silicon nitride nanoceramics was achieved with no noticeable involvement of α- to β-Si3N4 phase transformation and grain growth. This processing principle opens the way toward flexible and precise tailoring of the microstructures and properties of Si3N4 ceramics. The obtained silicon nitride nanoceramics showed improved wear resistance, particularly under higher Hertzian stresses.

Keywords

CeramicNanostructureSintering
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 12 , December 2010 , pp. 2354 - 2361
Copyright
Copyright © Materials Research Society 2010

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