Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Combined Effect of SiC and Carbon on Sintering Kinetics, MI-Crostructure and Mechanical Properties of Fine-Grained Binder-Less Tungsten Carbide

Eugeniy A Lantsev
,
Pavel V Andreev
* ORCID logo ,
Aleksey V Nokhrin
* ORCID logo ,
Maksim S Boldin
ORCID logo ,
Artem A Murashov
,
Gleb V Shcherbak
,
Kseniya E Smetanina
,
Vladimir N Chuvil'deev
,
Yuriy V Blagoveshchenskiy
,
Nataliya V Isaeva
,
Nataliya Yu Tabachkova
Version 1 : Received: 15 May 2023 / Approved: 15 May 2023 / Online: 15 May 2023 (10:06:48 CEST)

How to cite: Lantsev, E.A.; Andreev, P.V.; Nokhrin, A.V.; Boldin, M.S.; Murashov, A.A.; Shcherbak, G.V.; Smetanina, K.E.; Chuvil'deev, V.N.; Blagoveshchenskiy, Y.V.; Isaeva, N.V.; Tabachkova, N.Y. Combined Effect of SiC and Carbon on Sintering Kinetics, MI-Crostructure and Mechanical Properties of Fine-Grained Binder-Less Tungsten Carbide. Preprints 2023, 2023051015. https://doi.org/10.20944/preprints202305.1015.v1 Lantsev, E.A.; Andreev, P.V.; Nokhrin, A.V.; Boldin, M.S.; Murashov, A.A.; Shcherbak, G.V.; Smetanina, K.E.; Chuvil'deev, V.N.; Blagoveshchenskiy, Y.V.; Isaeva, N.V.; Tabachkova, N.Y. Combined Effect of SiC and Carbon on Sintering Kinetics, MI-Crostructure and Mechanical Properties of Fine-Grained Binder-Less Tungsten Carbide. Preprints 2023, 2023051015. https://doi.org/10.20944/preprints202305.1015.v1

Abstract

This paper investigates the density, phase composition, microstructure and mechanical properties (microhardness, fracture toughness) of binderless WC + SiC ceramics obtained by conventional pressureless sintering (CPS) and Spark Plasma Sintering (SPS). α-WC nanopowders obtained by DC arc plasma chemical synthesis and β-SiC powders have been used as raw materials. The content of SiC particles was 1, 3, 5% wt. Excess graphite (0.3, 0.5% wt.) was added to α-WC nanopowders to decrease the volume fraction of W2C particles that negatively affect the mechanical properties of ceramics. WC + 1% wt. SiC + 0.3% wt. C ceramics are shown to have a homogeneous fine-grained microstructure, high relative density, increased microhardness and Palmquist fracture toughness. The CPS and SPS activation energies of WC + SiC nanopowders at an intensive shrinkage stage are determined using the Young-Cutler model. The effect of carbon and SiC particles on the CPS and SPS activation energies of tungsten carbide nanopowders has been analyzed. The CPS activation energies of WC, WC + C and WC + SiC + C nanopowders are shown to be closer to the carbon diffusion activation energy along α-WC grain boundaries. The SPS activation energies of WC and WC + SiC nanopowders turn out to be lower than the carbon grain boundary diffusion activation energy of α-WC.

Keywords

tungsten carbide; silicon carbide; spark plasma sintering; nanopowder

Subject

Chemistry and Materials Science, Ceramics and Composites

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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