Diamond-based superhard composites: new synthesis approaches and application prospects
E.V. Kukuevac aInstitute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation bBaikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russian Federation cNational Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation
The paper discusses experimental results on high-temperature and high-pressure (HPHT) synthesis of diamond-like cubic boron nitride (cBN) and diamond with a high concentration of point defects. The presence of active fluids allows to obtain cBN with a carbon content up to 10%. The concentration of boron in the diamond lattice is about 2%, and that of vacancies is two times higher. The concentration and positions of substitution atoms were determined by the Rietveld refinement method. Diamond micropowder reactive sintering with fluid phases was used to synthesize new superhard composites. The microstructure and grain boundaries were investigated by transmission and scanning electron microscopy. Tests of the wear resistance of the new diamond-cBN composites demonstrated that these materials offer good prospects for various applications.
Keywords: diamond, boron nitride, superhard composites, high pressure, sintering, point defects, X-ray analysis, electron microscopy PACS:81.10.−h, 89.20.Bb (all) DOI:10.3367/UFNe.2018.04.038403 URL: https://ufn.ru/en/articles/2019/2/h/ Citation: Filonenko V P, Zibrov I P, Anokhin A S, Kukueva E V "Diamond-based superhard composites: new synthesis approaches and application prospects" Phys. Usp.62 207–212 (2019)