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Licensed Unlicensed Requires Authentication Published by De Gruyter May 31, 2013

Spark Plasma Sintering of Si3N4/C Composites

Zeynep Taslicukur , Filiz Cinar Sahin , Gultekin Goller , Onuralp Yucel and Nilgun Kuskonmaz
From the journal Materials Testing

Abstract

Si3N4/C composites were prepared with carbon black and α-Si3N4 powder by a novel sintering method, i.e. spark plasma sintering. SiC particles formed through reactions between the carbon particles and the SiO2 on the Si3N4 surface. The samples were sintered at 1650 °C for 5 minutes in a nitrogen atmosphere. The microstructure, phase composition, mechanical properties, and dielectric properties of the composites were investigated. The relative densities of the C/Si3N4 composites decreased from 99 to 85% when the carbon black content increased from 0 to 20 wt.-%. Bending strength, hardness and dielectric properties were found to be influenced by the amount of carbon black introduced into the silicon nitride matrix.

Kurzfassung

Funken-Plasma-Sintern von Si3N4/C-Verbundwerkstoffen. In der diesem Beitrag zugrunde liegenden Studie wurden Si3N4/C-Verbundwerkstoffe mit einem Ruß- und einem α-Si3N4-Pulver in einem neuen Sinterprozess, dem sogenannten Funken-Plasma-Sintern, hergestellt. SiC-Partikel formten sich dabei aufgrund von Reaktionen zwischen den Kohlenstoffpartikeln und dem SiO2 auf der Si3N4-Oberfläche. Die Proben wurden bei 1650 °C über 5 min in einer Stickstoffatmosphäre gesintert. Das Gefüge, die Phasenzusammensetzung, die mechanischen und die dielektrischen Eigenschaften wurden untersucht. Die relative Dichte der C/Si3N4-Verbundwerkstoffe nahm von 99% auf 85% ab, wenn der Rußanteil von 0 auf 20 wt.-% gesteigert wurde. Die Biegefestigkeit, die Härte und die dielektrischen Eigenschaften wurden durch den Rußanteil, der in die Silikonnitridmatrix eingebracht wurde, beeinflusst.


Zeynep Taslicukur, born in 1981, is research assistant at the Yildiz Technical University since 2002. Presently, she is PhD student studying silicon nitride/silicon carbide ceramics.

Filiz Cinar Sahin, born in 1965, received her PhD at the Istanbul Technical University in 1997. Presently, she is Assistant Professor in Metallurgical and Materials Engineering at the Istanbul Technical University. Her areas of interest are synthesis of high tech ceramics (carbide, borides, nitrides), sintering processes for ceramic-metal composites, production of precious metals from slags and industrial wastes by pyrometallurgical and hydrometallurgical processes.

Gultekin Goller, born in 1967, received his PhD at the Istanbul Technical University in 1997. Presently, he is Assistant Professor in Metallurgical and Materials Engineering at the Istanbul Technical University. His areas of interest are bio glasses and bio ceramics, hi-tech ceramic powder sythesis and composite processing, material characterization.

Onuralp Yucel, born in 1961, received his PhD at the Istanbul Technical University in 1992. Presently, he is Professor in Metallurgical and Materials Engineering at the Istanbul Technical University. His areas of interest are pyrometallurgy, ceramic powder production and processing, and the beneficiation of industrial wastes.

Nilgun Kuskonmaz, born in 1964, received her PhD at the Istanbul Technical University in 1993. Presently, she is Assistant Professor in Metallurgical and Materials Engineering at the Yildiz Technical University. Her areas of interest are advanced technology ceramics.


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Published Online: 2013-05-31
Published in Print: 2010-06-01

© 2010, Carl Hanser Verlag, München

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