Effect of B3Si on the Structure and Properties of B4C Ceramics.

Autor: Mazur, P. V., Grigoriev, O. M., Melakh, L. M., Kozak, I. V., Karpets, M. V., Vedel, D. V.
Zdroj: Journal of Superhard Materials; Jun2023, Vol. 45 Issue 3, p175-185, 11p
Abstrakt: Dense composite ceramics based on B4C with an addition of 10 to 50 wt % of B3Si were obtained by hot pressing. An increased amount of boron silicide decreases the hot pressing temperature to obtain a high-density material. We found a hot pressing temperature, optimal for each of the compositions and possess the highest hardness, which is associated with the formation of a fine-grained structure. Densification occurs during reactive hot pressing, which consists in the decomposition of B3Si into Si and BSin (n = 12–23) and further interaction with B4C to form SiC and B12(Si,B,C)3. The modification of boron carbide with silicon leads to the stabilization of hardness at ~24–26 GPa in the load range from 2 to 200 N. The highest bending strength of ~500 MPa is observed for samples with up to 20 wt % of B3Si. The optimal composition, which combines high values of hardness and flexural strength, is B4C–20 wt % B3Si. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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