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Thermal stability of nanocrystalline WC–Co powder synthesized by using mechanical milling at low temperature

Published online by Cambridge University Press:  31 January 2011

Jianhong He ,
Leoanardo Ajdelsztajn  and
Enrique J. Lavernia
Jianhong He
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
Leoanardo Ajdelsztajn
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
Enrique J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
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Abstract

Nanostructured WC–18% Co powder was synthesized by using cryogenic mechanical milling, and the thermal stability of the nanostructured powder was investigated in detail. The results indicated that the as-synthesized WC–18% Co powder had an average WC particle size of 25 nm. Growth of WC particles occurred above 873 K; however, the average WC particle size remained smaller than 100 nm in the powder isothermally heated for 4 h at 1273 K. Thermal exposure in air at T < 623 K did not result in significant oxidation of the cryomilled powder. The thermal exposure did promote the formation of WO2 and WO3 oxides. The Co6W6C phase was detected by x-ray diffraction in the powder heated in nitrogen at 1273 K, and the phases associated with decarburization of WC, such as W2C, W3C phases, were not observed. With increasing temperature, the dissolution of W and C elements in the Co matrix led to a gradual increase in {111} crystallographic plane spacing, eventually leading to the formation of an amorphous phase.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 478 - 488
Copyright
Copyright © Materials Research Society 2001

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