INVESTIGATION OF THE PHYSICAL AND MECHANICAL PROPERTIES OF BORON CARBIDE-BASED CERAMICS WITH VANADIUM DIBORIDE ADDITIONS
N.Yu. Burkhinova1,2, A.A. Filippov1,2, D.V. Dik1,2, I.S. Gertsel’2
1Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences (IES SB RAS), Yekaterinburg, Russia
2Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences (ITAM SB RAS), Novosibirsk, Russia
Keywords: boron carbide, vanadium diboride, hot pressing, carboborothermic reduction, fracture toughness
Abstract
Heterogeneous boron carbide-based ceramics with vanadium diboride additions, produced by uniaxial hot pressing, are investigated. During sintering, vanadium diboride was synthesized by carboborothermic reduction from vanadium oxide, as confirmed by X-ray diffraction analysis. The microstructure of the B4C-VB2 heterogeneous ceramics consists of uniformly distributed vanadium diboride grains in a boron carbide matrix. Increasing the vanadium diboride molar fraction from 0 to 5% is found to increase the fracture toughness of the ceramics from 2.0 to 5.5 MPa·m1/2.
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