Optimization of rolling process parameters for wurtzite boron nitride powders

Volkogon, V. M.; Avramchuk, S. K.; Kravchuk, A. V.; Radchenko, A. K.; Katashinskii, V. P.

doi:10.3103/s1063457607020086

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“…The study of the microstructure of such heterophase ceramics obtained in these systems shows that with a sufficiently large total content of residual free carbon and chromium boride in the ceramics, during indentation there are no chips of the material under the indenter, there are radial cracks and the maximum hardness is 19.46 MPa. The decrease in the total concentration of the second phases (C and CrВ2) in the material leads to the formation of petal cracks and chipping of the material in the indentation zone, which was confirmed in [12]. Fig.…”

Section: Discussion Of Research Resultsmentioning

confidence: 58%

“…Experimentally, during hot pressing (T  2100 °C) [11] of heterophase ceramics of the B4C-Cr2O3, system, the following parameters were obtained (Table 1), which is characteristic of heterophase ceramics [12]. They indicate that the amount of activating impurities in the production of hot-pressed ceramics based on boron carbide with maximum strength should be within 15 % of the mass.…”

Section: Discussion Of Research Resultsmentioning

confidence: 99%

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

Volkogon¹,

Avramchuk²,

Kovalchuk³

et al. 2020

J. Nano- Electron. Phys.

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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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Section: Discussion Of Research Resultsmentioning

confidence: 58%

Section: Discussion Of Research Resultsmentioning

confidence: 99%