Structure Formation in Equimolar Mixture of HfC–ZrC–TiC–NbC Carbides

• Published in: Russian physics journal 2021-11, Vol.64 (7), p.1191-1197
• Main Authors: Wang, D., Mirovoy, Yu. A., Burlachenko, A. G., Buyakov, A. S., Dedova, E. S., Buyakova, S. P.
• Format: Article
• Language: English
• Subjects: Carbides; Ceramics; Condensed Matter Physics; Hadrons; Hafnium carbide; Heavy Ions; Hot pressing; Hydrofluorocarbons; Lasers; Mathematical and Computational Physics; Mechanical properties; Niobium carbide; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Powders; Solid solutions; Substitutional solid solutions; Theoretical; Titanium carbide; Zirconium carbide
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-021-02443-x

Structure formation during hot pressing of an equimolar powder mixture HfC–ZrC–TiC–NbC in the temperature range from 1400 to 1900°C is investigated. It is found that a monophase substitutional solid solution (Hf, Zr, Ti, Nb)C based on hafnium carbide forms at a temperature of 1700°C. It is shown that the formation of the ceramic solid solution (Hf, Zr, Ti, Nb)C proceeded in many stages with the formation of intermediate two- and three-component ceramic solid solutions (Hf, Zr)C, (Nb, Zr)C, and (Hf, Zr, Ti)C and their subsequent dissolution. The resulting ceramic multicomponent substitutional solid solution (Hf, Zr, Ti, Nb)C has improved mechanical properties compared to similar properties of initial carbides: E = (616 ± 77) GPa, H = (36 ± 8) GPa, and K1C = ( 3.4 ± 0.5) MPa ∙ m 1/2 .