WC coarsening in cemented carbides during sintering. Part II: Mechanisms of the influence of different grain growth inhibitors

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F25%3A00388362" target="_blank" >RIV/68407700:21230/25:00388362 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.ijrmhm.2025.107087" target="_blank" >https://doi.org/10.1016/j.ijrmhm.2025.107087</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijrmhm.2025.107087" target="_blank" >10.1016/j.ijrmhm.2025.107087</a>

Result language

angličtina

Original language name

WC coarsening in cemented carbides during sintering. Part II: Mechanisms of the influence of different grain growth inhibitors

Original language description

It was reported in the literature that the influence of grain growth inhibitors (GGIs) on the WC grain growth during sintering of cemented carbides is related to the formation of complexions at WC/Co interfaces at temperatures of liquid-phase sintering. However, this viewpoint was not confirmed experimentally, as such complexions were found upon cooling after sintering. The influence of different grain growth inhibitors on the kinetics of WC coarsening in WC-10 wt% Co cemented carbides was investigated. The presence of complexions having a thickness of nearly 1 to 3 nm at WC/Co interfaces was established by STEM, EDX and HRTEM as a result of adding VC, Cr3C2 and TaC to WC + Co. WC grains in WC-Co cemented carbides containing Mo2C was characterized by the presence of near-surface layers of (W,Mo)C having a thickness of about 100 nm and absence of complexions at the WC/binder interface. The values of activation energies for all the GGIs except for Mo2C lie in the range typical for the solid-state diffusion-controlled processes, therefore, the solid-state diffusion of W and C atoms through the nm-thick complexions is presumably a limiting stage of WC coarsening. Considering the activation energy and distribution of heavy elements in the binder for the samples doped with Mo2C, one can assume that in the liquid binder containing dissolved W, C and Mo atoms, molybdenum suppresses the diffusion of tungsten atoms. Therefore, the rate of the tungsten atoms' diffusion in the liquid binder is likely to be a limiting stage of WC coarsening.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Refractory Metals and Hard Materials

ISSN

0263-4368

e-ISSN

2213-3917

Volume of the periodical

128

Issue of the periodical within the volume

April

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

18

Pages from-to

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UT code for WoS article

001422851400001

EID of the result in the Scopus database

2-s2.0-85216577290