CC BY
18iSHS 2019
Moscow, Russia
HYBRID POWDER BINDERS FOR EXTRA WEAR RESISTANT
DIAMOND CUTTING TOOLS
D. A. Sidorenko*", P. A. Loginov", and E. A. Levashov"
aNational University of Science and Technology MISiS,
Moscow, 119049 Russia *e-mail: d.sidorenko@misis.ru
DOI: 10.24411/9999-0014A-2019-10164
Diamond tools are widely used to machine the most difficult-to-work-with materials, such as natural stone, reinforced concrete, asphalt and steels. The tool is a composite material with diamond grains incorporated into the metal, ceramic, or polymer binder. A promising way to design enhanced metal binders is mechanical alloying of elemental powders with simultaneous nanoparticle reinforcement.
We have proposed a new way of advanced binder design, which involved hybrid reinforcement with different types of nanoparticles. The various nanoparticles (MWCNT, h-BN, WC) and their combinations were incorporated into metallic matrices and their mechanical properties were experimentally determined. Nanoparticles pattern of distribution in binders (intracrystalline or intercrystalline) was studied using transmission electron microscope (Fig. 1). In-situ tests were curried out to study the effect of various nanoparticles on the deformation and fracture mechanisms of the composite materials under compression and tension conditions in a transmission electron microscope.
C d
Fig. 1 Microstructure of hot pressed model sample [80%Cu-20%Ni]-0.1%hBN + 0.1%MWCNT + 0.69% WC (a) and images of hBN (b), CNT (c) and WC nanoparticles (d).
It was shown that the strong positive effect of the proposed combined nanoreinforcement was caused not by accumulation of mechanical effects, but rather by combination of different structure controlling effects, namely, grain size reducing due to carbon nanotubes introduction, mechanical reinforcement because of tungsten carbide, and lubricating properties of h-BN particles.
This work was supported by the Russian Science Foundation (grant no. 17-79-20384).
D. A. Sidorenko et al.
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