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Properties of nanostructured diamond-silicon carbide composites sintered by high pressure infiltration technique

Voronin, G. A. and Zerda, T. W. and Gubicza, Jenő and Ungár, Tamás and Dub, S. N. (2004) Properties of nanostructured diamond-silicon carbide composites sintered by high pressure infiltration technique. Journal of Materials Research, 19 (9). pp. 2703-2707. ISSN 0884-2914 (print), 2044-5326 (online)

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Abstract

A high-pressure silicon infiltration technique was applied to sinter diamond–SiC composites with different diamond crystal sizes. Composite samples were sintered at pressure 8 GPa and temperature 2170 K. The structure of composites was studied by evaluating x-ray diffraction peak profiles using Fourier coefficients of ab initio theoretical size and strain profiles. The composite samples have pronounced nanocrystalline structure: the volume-weighted mean crystallite size is 41–106 nm for the diamond phase and 17–37 nm for the SiC phase. The decrease of diamond crystal size leads to increased dislocation density in the diamond phase, lowers average crystallite sizes in both phases, decreases composite hardness, and improves fracture toughness.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika
Depositing User: Erika Bilicsi
Date Deposited: 12 Oct 2012 07:40
Last Modified: 12 Oct 2012 07:40
URI: http://real.mtak.hu/id/eprint/3105

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