Combined Synthesis of Heterogeneous Powders in CaB6–TiB2 System


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Abstract

The heterogeneous CaB6–TiB2 powder mixtures were synthesized by reducing the mixture of TiO2 and CaCO3 with boron carbide in vacuum at 1400 – 1650°C. Reaction hot pressing was conducted according to the following regime: 1500°C (synthesis in vacuum) – 1900°C (pressing in Ar). As a result of synthesizing CaB6–TiB2 at mass ratio of 1:1 and 1600°C followed by isothermal soaking for 1 hour, a heterogeneous mixture was obtained containing crystalline phases of CaB6 and TiB2 with the residual B4C impurity (0.5 wt. %). The powder particles represent grains measuring 1 – 3 μm in diameter and containing two phases CaB6 and TiB2 in the form of crystallites measuring 0.1 – 1.0 μm in diameter uniformly distributed throughout the particle volume.

About the authors

D. D. Nesmelov

Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State Technological Institute (Technical University)

Author for correspondence.
Email: dnesmelov@yandex.ru
Russian Federation, St. Petersburg

A. S. Lysenkov

State Budgetary Institution of Science, “A.A. Baikov Institute of Metallurgy and Materials Science”

Email: dnesmelov@yandex.ru
Russian Federation, Moscow

D. P. Danilovich

Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State Technological Institute (Technical University)

Email: dnesmelov@yandex.ru
Russian Federation, St. Petersburg

T. V. Kotsar

Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State Technological Institute (Technical University)

Email: dnesmelov@yandex.ru
Russian Federation, St. Petersburg

S. S. Ordan’yan

Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State Technological Institute (Technical University)

Email: dnesmelov@yandex.ru
Russian Federation, St. Petersburg

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