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Preparation of SiC-Diamond Nanocomposites

Published online by Cambridge University Press:  16 February 2011

S. Gierlotka ,
E. Ekimov ,
B. Palosz ,
S. Stel'makh ,
R. Pielaszek ,
A. Witek ,
E. Grzanka ,
A. Presz ,
H. Boysen  and
U. Bismayer
S. Gierlotka
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
E. Ekimov
Affiliation:
Institute for High Pressure Physics RAS, Troitsk, Moscow reg., 142092, Russia
B. Palosz
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
S. Stel'makh
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
R. Pielaszek
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
A. Witek
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
E. Grzanka
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
A. Presz
Affiliation:
High Pressure Research Center UNIPRESS, ul.Sokolowska 29, 01 142 Warsaw, Poland
H. Boysen
Affiliation:
Institut für Kristallographie der Universität Minchen, Theresienstr.41, 80333 München, Germany
U. Bismayer
Affiliation:
Mineralogisch-Petrografisches Institut, Uni Hamburg, Grindelallee 48, 20146 Hamburg, Germany
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Abstract

Compacts of composites SiC-diamond were made by infiltration of Si into nanocrystalline diamond powders in a toroid-type press under the pressure of 7.7 GPa at 1300 °C. In-situ high pressure diffraction studies of these processes were performed in MAX80 cubic anvil press at a pressure of 8.5 GPa in temperatures up to 1800°C in HASYLAB at DESY, Hamburg, Germany. Sintering was performed for (i) pure nanocrystalline diamond powders, (ii) a mixture of nanocrystalline powders of diamond and nanocrystalline SiC, (iii) a mixture of nanocrystalline diamond with microcrystalline Si powders and (iv) compacts of nanocrystalline diamond infiltrated by Si. The SiC-diamond composites obtained by infiltration of Si have best physical properties: hardness similar to conventional diamond compacts (approximately 50 GPa), highest density 3.35 g cm-3 and uniform nanocrystalline microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 505
Copyright
Copyright © Materials Research Society 1999

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References

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