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Статья от экспертов

Carbothermic synthesis of titanium diboride: upgrade

The technology of carbothermic reduction of titanium and boron oxides in the TiО2-B2О3-C reaction mixture at temperatures up to 1070 °C is presented. The temperature and atmospheric regimes of low-temperature reduction of TiO2 are determined. In the Ti-B-O-C system, successive phase formation of TiО2→TinO2n-1→TiBО3→TiCxO1-x→TiB2 at 1030 ÷ 1050 °C was realized, which was recorded by X-ray phase analysis of the samples after synthesis. The conditions for the realization of low-temperature synthesis are established, which consist in observing the prescriptions and special regimes for preparing the reaction mixture, the conditions for heating and holding the samples in a controlled atmosphere. For discussion, the mechanism of oxycarboboride phases formation at each of the stages of reduction of activated titanium oxide is presented. The principal possibility of low-temperature synthesis of TiB2 in the composition of carbon-graphite products by free pitch technology in the conditions of ...

A model of the modular competency-based approach in the implementation of programs for vocational training, retraining, and upgrade of qualifications