Cdiamond–(WC–Co)–ZrO2 Composite Materials with Improved Mechanical and Adhesive Properties
Ratov B.T. Mechnik V.A. Rucki M. Gevorkyan E.S. Bondarenko N.A. Kolodnitskyi V.M. Chishkala V.A. Kudaikulova G.A. Muzaparova A.B. Korostyshevskyi D.L.
April 2023Pleiades Publishing
Journal of Superhard Materials
2023#45Issue 2103 - 117 pp.
Abstract: The structure, mechanical properties (hardness H and elastic modulus E), evaluation parameters for determining the resistance of the material to elastic (H/E) and plastic (H 3/E 2) deformations, resistance 1/(E 2/H) to abrasive wear, and the ability of the hard alloy matrix to hold diamond grains from their precipitation in the 25 wt % Cdiamond‒70.5 wt % WC‒4.5 wt % Co composite diamond-containing materials (CDMs) with different contents of ZrO2 (in the range from 0 to 10 wt %), which are formed by the spark plasma sintering (SPS) method in the temperature range of 20‒1350°C under a pressure of 30 MPa for 3 min. The initial CDMs have a coarse grained structure with weak adhesion of diamond grains to the hard alloy matrix and are characterized by low values of H/E, H 3/E 2, and 1/(E 2 H), which is the reason for the premature loss of diamond grains. The presence of ZrO2 in the composition of CDMs interferes with the processes of Oswald ripening and acts as a growth inhibitor that ensures the reduction of WC grains, the formation of strong adhesion of diamond grains to the matrix, and a substantial increase in the H/E, H 3/E 2, and 1/(E 2 H) parameters. As a result, the ability of the matrix to reliably hold diamond grains from premature loss during the CDMs operation increases. It is shown that the addition of zirconium dioxide in the amount of 10 wt % to the composition of the 25 wt % Cdiamond‒70.5 wt % WC‒4.5 wt % Co composite leads to increases in the H/E parameter from 0.043 to 0.057, in the H 3/E 2 parameter from 0.05 to 0.075 GPa, and in the 1/(E 2 H) parameter from 0.75 × 10–7 to 2.75 × 10–7 GPa–3. Moreover, signs of strong adhesion between the diamond grains and the carbide matrix in the CDMs samples are revealed.
adhesion , cemented carbide , cobalt , composite , composition , concentration , plasma spark sintering , properties , structure , zirconium dioxide
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Satbayev University, Almaty, 050013, Kazakhstan
Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, Kyiv, 04074, Ukraine
Kazimierz Pulaski University of Technology and Humanities in Radom, Radom, 26-600, Poland
Ukrainian State University of Railway Transport, Kharkiv, 61001, Ukraine
Karazin Kharkiv National University, Kharkiv, 61000, Ukraine
Satbayev University
Bakul Institute for Superhard Materials
Kazimierz Pulaski University of Technology and Humanities in Radom
Ukrainian State University of Railway Transport
Karazin Kharkiv National University
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