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Processing, mechanical and thermophysical properties of silicon nitride based composites with carbon nanotubes and graphene

Koszor O. (Ceramics and Composites Laboratory, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)
Wéber F. (Ceramics and Composites Laboratory, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)
Arató P. (Ceramics and Composites Laboratory, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)
Lindemann A.
Biró L.P. (Nanotechnology Department, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)
Horváth Z.E. (Nanotechnology Department, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)
Kónya Z. (Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary)
Kiricsi I. (Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary)
Balázsi Cs. (Ceramics and Composites Laboratory, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Science, Budapest, Hungary)

Silicon nitride based composites with different amount (1, 2 and 3 wt%) of multi-wall and single-wall carbon nanotubes, and graphene have been prepared. Optimisation of the manufacturing processes has been conducted to preserve the carbon nanotubes in composites and to avoid damaging during high temperature processing. The first results show that carbon nanotubes have a good contact to the surface of silicon nitride grains. In the case of increase of sintering pressure an increase of bending strength was achieved. It was found that microstructure features achieved by properly designed sintering parameters are the main responsible factors for the strength improvements.

Keywords: carbon nanotubes, graphene, silicon nitride, mechanical properties