Carbothermic Synthesis of Titanium Diboride: Upgrade

Abstract

The technology of carbothermic reduction of titanium and boron oxides in the TiО 2-B 2 О 3-C reaction mixture at temperatures up to 1070 °C is presented. The temperature and atmospheric regimes of lowtemperature reduction of TiO 2 are determined. In the Ti-B-O-C system, successive phase formation of TiО 2 →Ti n O 2n-1 →TiBО 3 →TiC x O 1-x →TiB 2 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 TiB 2 in the composition of carbon-graphite products by free pitch technology in the conditions of existing kilns is shown.