Dependence of the Mechanical Properties on Low Nano-SiC Particle Content of Hot Pressed Alumina

  1. Prof. Dr. G. Müller
  1. Matthias Wilhelm and
  2. Werner Wruss

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch10

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Wilhelm, M. and Wruss, W. (2000) Dependence of the Mechanical Properties on Low Nano-SiC Particle Content of Hot Pressed Alumina, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch10

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. Institute of Chemical Technology of Inorganic Materials, University of Technology of Vienna, Austria

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

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Keywords:

  • mechanical properties of hot pressed Al2O3/SiC ceramics;
  • low nano-SiC particle content

Summary

The purpose of the study was to investigate the mechanical properties of hot pressed Al2O3/SiC ceramics. As starting materials two alumina powders (I and II) with mean particle sizes <1 μm are used. The Nano-SiC (mean particle size: 10 nm) is used at low volume fractions (<1 vol%). Attrition milling and a dispersion agent is used to produce the composites. The mixtures are hot-pressed at 1500 °C and 1650 °C at 25 MPa. Using alumina I, a clear enhancement of the fracture strength with increasing SiC fraction is obtained (from 600 MPa for monolithic alumina up to 860 MPa for the composite containing 0.7 vol% SiC nanopowder). The fracture toughness keeps almost constant at 6 MPam1/2. In the case of using alumina II, the fracture strength is independent on the SiC fraction as well as on the sintering temperature and keeps at approximately 800 MPa. The toughness keeps constant at 6.3 MPam1/2. The grain growth of alumina is dependent on the alumina quality and is clearly reduced with increasing SiC volume fraction. The addition of an dispersion agent can partially improve the homogeneous distribution of the nano SiC particles within the composites.