Phase Formation and Diamond Retention in Cdiamond–(WC–Co)–ZrO2 Composites Formed by Spark Plasma Sintering Method


Ratov B.T. Mechnik V.A. Bondarenko N.A. Gevorkyan E.S. Kolodnitskyi V.M. Kalzhanova A.B. Sundetova P.S. Utepov Z.G.
April 2024Pleiades Publishing

Journal of Superhard Materials
2024#46Issue 2112 - 128 pp.

Abstract: New data on the effect of a ZrO2 nanopowder additive (from 0 to 10 wt %) on phase formation and structural transformations in the hard-alloy matrix in the region of destruction under impact loading and on diamond retention in composite diamond-containing 25Сdiamond–70.5WC–4.5Co materials formed by spark plasma sintering are presented. The sintered initial 94WC–6Co composite consists of the hexagonal WC phase with unit cell parameters a = 0.2906 nm and с = 0.2837 nm, the cubic Co3W3C phase (а = 1.1112 nm), and the hexagonal graphite phase. The sintered composites with ZrO2 content from 0.5 to 10% is composed by the WC and Co3W3C structural phases, amorphous carbon, and the tetragonal ZrO2 phase (а = 0.36019 nm, с = 0.5174 nm). It has been shown that, when the ZrO2 content is increased, the sizes of phase components and average microstrains are more rapidly decreased in directions с and а of the 94WC–6Co composite. The addition of ZrO2 to the 25Сdiamond–70.5WC–4.5Co composite improves diamond retention. In the sintered composites, diamond retention is improved due to that they have a higher content of the tetragonal ZrO2 phase, which provides the transformational mechanism of strengthening in the hard-alloy matrix material via its structural transformations into a denser one and the formation of a more fine-grained matrix structure with thin interlayers of cobalt bonds between WC grains.

composite , composition , diamond retention , matrix , phase , spark plasma sintering , tungsten carbide , zirconia

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Satpayev University, Almaty, 050013, Kazakhstan
Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, Kyiv, 04074, Ukraine
Kazimierz Pułaski University of Technology and Humanities in Radom, Radom, PL26-600, Poland
Ukrainian State University of Railway Transport, Kharkiv, 61050, Ukraine
Caspian University, Almaty, 050000, Kazakhstan

Satpayev University
Bakul Institute for Superhard Materials
Kazimierz Pułaski University of Technology and Humanities in Radom
Ukrainian State University of Railway Transport
Caspian University

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