Optimization of the Composition and Process of Preparation of Hot-pressed Ceramics with Increased Characteristics Based on Boron Carbide

Authors V.M. Volkogon1 , S.K. Avramchuk1 , V.V. Kovalchuk1, A.V. Kravchuk1 , A.V. Stepanenko1, D.A. Kotliar1, T.V. Pavlychuk1 , T.M. Kutran1, V.S. Antonyuk2 , K.І. Avramchuk2

1Frantsevich Institute for Problems in Materials Science, National Academy of Sciences of Ukraine, 3, Krzhizhanovsky St., 03142 Kyiv, Ukraine

2National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37, Peremogy Ave., 03056 Kyiv, Ukraine

Issue Volume 12, Year 2020, Number 6
Dates Received 03 May 2020; revised manuscript received 20 December 2020; published online 25 December 2020
Citation V.M. Volkogon, S.K. Avramchuk, V.V. Kovalchuk, et al., J. Nano- Electron. Phys. 12 No 6, 06034 (2020)
DOI https://doi.org/10.21272/jnep.12(6).06034
PACS Number(s) 42.79.Bh
Keywords Boron carbide, Activating impurities, Hot pressing, X-ray analysis (2) , Stress-strain state, Density (33) , Flexural strength, Hardness (12) , Microstructure (21) .

The optimal composition and conditions for obtaining hot-pressed ceramics based on powders of technical boron carbide, which has high physical and mechanical properties and can be effectively used in extreme operating conditions, are determined. The influence of activating impurities in the form of oxides in the composition of the initial charge on the formation of the composite material structure in the process of hot pressing is experimentally established. X-ray diffraction analysis of heterophase ceramics which is formed is carried out and it is shown that in the process of hot pressing of ceramics, borides of the corresponding oxides are formed, refining of ceramics with the emergence of secondary structures takes place, and heterogeneous state of the formed ceramics provides a high level of structural characteristics. It is established that the use of activating impurities in the form of Cr2O3, TiO2 and SiO2 oxides provides the possibility of using industrial technical powders of boron carbide with high free carbon content in the production of ceramics with fine-grained structure and high mechanical properties (Gzg  600-800 MPa) in a wide temperature range.

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