Combined Synthesis of Heterogeneous Powders in CaB6–TiB2 System
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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.
Keywordscalcium hexaboride CaB6 titanium diboride TiB2 combined synthesis boron carbide B4C heterogeneous powder
This study was performed within the scope of the Russian Foundation for Basic Research (RFBR) projects Nos. 17-03-00863 and 18-33-01281 with the use of equipment of the St. Petersburg GTI (TU) Engineering Center.
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