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Micron diamond composites with nanocrystalline silicon carbide bonding

Published online by Cambridge University Press:  31 January 2011

J. Qian ,
T. W. Zerda ,
D. He ,
L. Daemen  and
Y. Zhao
J. Qian*
Affiliation:
Texas Christian University, Physics and Astronomy Department, Fort Worth, Texas 76129, and Manuel Lujan, Jr., Neutron Scattering Center, MS-H805, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
T. W. Zerda
Affiliation:
Texas Christian University, Physics and Astronomy Department, Fort Worth, Texas 76129
D. He
Affiliation:
Manuel Lujan, Jr., Neutron Scattering Center, MS-H805, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
L. Daemen
Affiliation:
Manuel Lujan, Jr., Neutron Scattering Center, MS-H805, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Y. Zhao
Affiliation:
Manuel Lujan, Jr., Neutron Scattering Center, MS-H805, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
*
a)Address all correspondence to this author. e-mail: jiangq@lanl.gov
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Abstract

Diamond composites with nanocrystalline cubic silicon carbide bonding were sintered from diamond/amorphous silicon mixtures under high pressure and high temperature (p = 5 GPa and temperatures up to 1673 K). Differential scanning calorimetry, ex situ x-ray, and Raman spectroscopy investigations showed that amorphous silicon partially transformed into nanocrystalline silicon at 873 K under 5 GPa. This was followed by the formation of nanocrystalline silicon carbide from the reaction between the silicon and diamond after silicon melting. Refinement of the x-ray diffraction patterns of composites with the Rietveld method revealed that considerable microstrain (0.3–0.5%) remained within the nanocrystalline silicon carbide grains. Small strain (0.1–0.2%) was observed in the compacted diamonds, but after the reaction they became almost strain free (<0.1%). Enhanced fracture toughness was obtained for hybrid composites compared to liquid-infiltrated composites.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 5 , May 2003 , pp. 1173 - 1178
Copyright
Copyright © Materials Research Society 2003

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