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Title of Article

SPARK PLASMA SINTERING OF NANOSTRUCTURED TUNGSTEN CARBIDE AND CARBIDE ALLOYS


Issue
2
Date
 2013

Article type
 scientific article
UDC
669, 538.9
Pages
115-119
Keywords
tungsten carbide (WC), nanopowders, carbide alloys (carbides), electropulse sintering, density, hardness, fracture toughness (crack resistan


Authors
Chuvildeev V.N.
Nauchno-issledovatelskiy fiziko-tekhnicheskiy institut NNGU im. N.I. Lobachevskogo

Moskvicheva A.V.
Nauchno-issledovatelskiy fiziko-tekhnicheskiy institut NNGU im. N.I. Lobachevskogo

Boldin M.S.
Nauchno-issledovatelskiy fiziko-tekhnicheskiy institut NNGU im. N.I. Lobachevskogo

Sakharov N.V.
Nauchno-issledovatelskiy fiziko-tekhnicheskiy institut NNGU im. N.I. Lobachevskogo

Blagoveschenskiy Yu.V.
Institut metallurgii i materialovedeniya im. A.A. Baykova RAN, Moskva

Isaeva N.V.
Institut metallurgii i materialovedeniya im. A.A. Baykova RAN, Moskva

Melnik Yu.I.
Institut metallurgii i materialovedeniya im. A.A. Baykova RAN, Moskva

Shotin S.V.
Institut metallurgii i materialovedeniya im. A.A. Baykova RAN, Moskva

Nokhrin A.V.
Nauchno-issledovatelskiy fiziko-tekhnicheskiy institut NNGU im. N.I. Lobachevskogo


Abstract
The consolidation of nanosized pure tungsten carbide and carbide alloy powders by spark plasma sintering has been studied. Pure WC sintering modes within the temperature interval (1400–1950)?C and heating rates from 25 to 2400?C/min have been investigated. Nanostructured specimens with a record hardness of 3180 HV and a satisfactory fracture toughness of K1c=4.5–6.5 MPa?m1/2 have been obtained. The article determines the dependences of density, hardness, and grain structure of WC-8 wt.% Co alloys with TaC/VC inhibitors on the sintering temperature, heating rate and solid-state sintering time. Nanostructured WC-8 wt.% Co specimens with high values of hardness (17–19 GPa) and fracture toughness (more than 10 MPa?m1/2) have been obtained.

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