Nanocomposites and nanomaterials
Intensification of the compaction process of diamond nanopowder under high pressure and high temperature
Bochechka O.O., ChernienkoO.I., Kushch O.V., Venikov V.O., Havrylova V.S.
V. Bakul Institute for Superhard Materials, Natl. Acad. of Sci. of Ukraine. Avtozavodska, 2, Kyiv-04074, Ukraine. 
E-mail: obochechka@gmail.com
The influence of surface modification of particles of diamond nanopowder of static synthesis by carbon–tungsten bonds on the degree of compaction of diamond–tungsten carbide composite samples sintered from it at a pressure of 8 GPa has been studied. The process of W–C bonds formation on the surface of diamond particles is described in [1].
The ratio of the volume of the diamond component in the composite or polycrystal, Vd, to the volume of the sample, V, is taken as the compaction characteristic Vd/V. 
It has been established that the compaction degree of diamond nanopowder increases by 8% (fig.) due to surface modification with carbon-tungsten binders in combination with degassing before sintering and the reaction interaction of diamond with tungsten. Thus, the modification of the surface intensifies the process of compaction of the diamond nanopowder of static synthesis under the action of high pressure and high temperature.

Fig. Dependence of the Vd/V value of the diamond-tungsten carbide nanocomposite (1) sintered from the ACM5 0.1/0 diamond nanopowder modified with C–W bonds and a polycrystal from this powder without modification and degassing (2) on the sintering temperature: pressure 8 GPa, sintering time 20 s.
1. Bochechka O.O. at al. Effect of surface modification of diamond nanopowder particles on the properties of nanocomposite "diamond - tungsten carbide" sintered from them // NANO-2021. Book of abstracts.  Kyiv, Ukraine, 2021. P. 126.