About
24
Publications
2,719
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
178
Citations
Introduction
Oleksii Popov currently works at the Department of Metal Physics, National Taras Shevchenko University of Kyiv. Oleksii does research in Materials Engineering, Mechanical Engineering and Structural Engineering. Their most recent publication is 'The influence of high pressure on TiC-B 4 C reaction kinetics'.
Additional affiliations
April 2017 - July 2017
January 2006 - November 2020
Education
September 1992 - July 1999
Publications
Publications (24)
A reactive sintering technique with a small addition of carbon (up to 1.9 wt.%) has been used for tungsten powder consolidation. The process allowed procurement of the nonporous and fully densified material at 1300 °C and 30 MPa in 12 min. The SEM and EDX analysis showed that the milling of 5 μm tungsten powder with 0.6, 1.3, and 1.9 wt.% of carbon...
Soft TiB2-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B4C precursors. TiB2 formation was observed already after the hot pressing at 1100 °C, remaining the only phase identifiable by XRD even after sintering at 1500 °C. Analysis of reaction kinetics allows us to assume that the m...
The paper encompasses deeper understanding of sintering, properties and applications of nanostructured refractory ceramics with “hard”/”soft” ceramic phase combinations. TiB2–SiC–C Ultra High Temperature Ceramics in heteromodulus form with the in-situ formed nanostructured carbon were sintered via reactive route. It is shown that the green body com...
Biocompatible Al2O3–hBN ceramic was sintered from AlN and B2O3 precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from Al2O3 and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered Al2O3–hBN....
TiB 2-SiC-C and TiB 2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B 4 C-Si and TiC-B 4 C precursors at 1830°C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B 4 C-Si green body create submicron (100-400 nm) TiB 2 crystals inside silicon car-bide grains as well as B...
The in-situ exothermic reactions between ZrC0.8, B4C and Si have assisted densification and allowed to obtain fully dense ZrB2-31 wt.%SiC ultra-high temperature ceramics within 6 minutes at 1750 °C. The use of zirconium carbide instead of metallic zirconium in the green body obviated the possibility of in-situ SHS process and allowed to apply the p...
Al–Cu matrix composites with 5 wt% of graphite nanoplatelets additives were prepared using mechanical alloying (MA) of elemental Al–Cu–C powder mixtures followed by hot pressing at 480–510 °C and 30 MPa. The obtained powders and sintered samples were studied using scanning electron microscopy (SEM), X-ray diffractometry (XRD), differential scanning...
TiB2-SiC ceramics with multi-wall carbon nanotubes (MW-CNT) were reactively hot pressed at 1800 °C and 30 MPa. Carbon nanotubes survived the process and could be clearly observed in the sintered ceramics. The insitu exothermic reactions between TiC, B4C and Si accelerated the densification and produced nonporous TiB2-SiC ultrahigh-temperature ceram...
Reactive hot pressing of TiC–B4C precursors was undertaken at 1800 °C to produce TiB2 with carbon inclusions. Atomic mechanisms of titanium diboride nucleation, as well as sponge-like carbon inclusions and submicron platelets of graphite precipitation have been investigated. Precursor grain size, green body composition and synthesis time were varie...
The multiphase composite ceramics with ТіB2-Al2O3-based matrix and LaB6-TiB2 eutectic inclusions have been synthesised via reactive hot pressing of Al-В2О3-Ті-LaB6-ТіB2 powder. The sintered materials were characterised by X-Ray Diffraction, Scanning Electron Microscopy and Energy Dispersive X-Ray Spectroscopy. The intermediate melts of aluminium an...
The influence of high pressure on TiB2-C structure formation during reactive sintering of TiC-B4C precursors is investigated. The isostatic pressure of 8 GPa has been shown to intensify the charge consolidation but to suppress new phase emerging. The latter confirmed gas phase diffusion to be predominant mechanism of boron to TiC transfer, and limi...
ZrB2/SiC composite is successfully synthesized from ZrC-Si-B4C-ZrB2 (x) mixture powders at 1800°C and 30 MPa using reaction hot sintering technique. The influences of zirconium diboride on the sintering behaviour, microstructure development, and mechanical properties are investigated. The mechanisms of strengthening and toughening of ceramic compos...
Hot pressing of 2TiC-B4C powder mixture at 1800ºC and 30 MPa leads to TiB2 and graphite formation and allowed in situ obtaining high-E, low-E ceramic composites. To investigate the reaction mechanisms, B4C and TiC plates were annealed together, separated with a graphite ring in vacuum and air at 1200 – 1900ºC. Titanium diboride appeared on titanium...
The densification kinetics and structure of TiB2-TiC-C, TiB2-C and TiB2-B4C-C hetero-modulus ceramics produced via reaction hot-pressing of B4C and TiС precursors are investigated. The reaction begins at 1100°C with boron carbide decomposition and progresses in two main stages which can be predominantly determined by the boron atoms to TiC grains d...
The influence of Y2O3 nanoparticles on structure and mechanical properties of hafnium is investigated. Scanning electron microscopy and energy dispersive analysis showed that yttria nanoparticles melt in vacuum arc forming interstitial solution Hf (Y, O). Samples structure investigation showed the growth of internal microstresses which causes mater...
Structure and mechanical characteristics of dense ceramic composites synthesised by reactive hot pressing of TiC–B4C powder mixtures at 1800–1950°C under 30 MPa were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM and EDX). The results show that during hot pressing solid-phase chemical r...
The influence of Y2O3 nanoparticles on structure and interstitial atoms distribution in sintered iron is investigated. Scanning electron microscopy and energy-dispersive analysis showed that yttrium oxide particles provoked globular ferrite structure formation. Investigation of nitrogen atoms distribution on the material surface did not prove the t...
A manufacturing method of high toughness TiB2–Al2O3 ceramic composites by reactive hot
pressing via exothermic reactions with Al, B2O3, C and TiB2 has been developed. The usage of
fusible initial components (Al and B2O3) in the hot pressing procedure allowed forming dense
ceramics with homogeneous fine structure at 1900uC and 20 MPa (after 8 min ex...
Reaction hot-pressing method was developed to produce ТіВ2 – Al composites using Ті, Al, and В nongrinned powders. In-situ exothermic reaction allowed to obtain dense materials with high HV (23 GPa) and K1C (9 MPa·m1/2) at temperatures 1600 – 1800 °C during 8 minutes.
Исследованы особенности формирования структуры и механические свойства керамического композиционного материала системы TiB2–Al2O3, полученного методом реакционного горячего прессования порошков, в зависимости от приложенного давления. Показано, что с увеличением давления горячего прессовании микротвердость и трещиностойкость композита возрастают и...
