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Superhard B–C–N materials synthesized in nanostructured bulks

Published online by Cambridge University Press:  31 January 2011

Y. Zhao ,
D. W. He ,
L. L. Daemen ,
T. D. Shen ,
R. B. Schwarz ,
Y. Zhu ,
D. L. Bish ,
J. Huang ,
J. Zhang  and
G. Shen
...Show all authors
Y. Zhao*
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
D. W. He
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
L. L. Daemen
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
T. D. Shen
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
R. B. Schwarz
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
Y. Zhu
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
D. L. Bish
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545
J. Huang
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545 and Department of Physics, Boston College, Massachusetts 02467
J. Zhang
Affiliation:
Mineral Physics Institute, State University of New York, Stony Brook, New York 11794
G. Shen
Affiliation:
Consortium for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637
J. Qian
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and Department of Physics & Astronomy, Texas Christian University, Fort Worth, Texas 76129
T. W. Zerda
Affiliation:
Department of Physics & Astronomy, Texas Christian University, Fort Worth, Texas 76129
*
a)Address all correspondence to this author.[email protected]
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Abstract

We report here the high-pressure synthesis of well-sintered millimeter-sized bulks of superhard BC2N and BC4N materials in the form of a nanocrystalline composite with diamond-like amorphous carbon grain boundaries. The nanostructured superhard B–C–N material bulks were synthesized under high P–T conditions from amorphous phases of the ball-milled molar mixtures. The synthetic B–C–N samples were characterized by synchrotron x-ray diffraction, high-resolution transmission electron microscope, electron energy-loss spectra, and indentation hardness measurements. These new high-pressure phases of B–C–N compound have extreme hardnesses, second only to diamond. Comparative studies of the high P–T synthetic products of BC2N, BC4N, and segregated phases of diamond + cBN composite confirm the existence of the single B–C–N ternary phases.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3139 - 3145
Copyright
Copyright © Materials Research Society 2002

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