Study of Thermal Explosion Products in Mechanically Activated Powder Mixtures of Intermetallic Compounds of the Titanium-Iron System with Carbon
G. A. Pribytkov, A. V. Baranovsky, I. A. Firsina
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
Keywords: titanium-iron intermetallic compounds, carbon, mechanical activation, thermal explosion, titanium carbide, iron-based binder
Abstract
Iron-matrix composites reinforced with dispersed titanium carbide particles, produced by sintering or coating with titanium carbide powder mixtures with steels, find practical application as wear-resistant materials and coatings. Composite powders with a metal-matrix composite structure of titanium carbide and an iron-based binder are used for applying wear-resistant coatings. The possibility of producing such composite powders by synthesis in mechanically activated powder mixtures of Ti-Fe intermetallic compounds with carbon (carbon black) was investigated. It was found that heating powder mixtures of Fe2Ti and FeTi intermetallic compounds with carbon (carbon black), pre-treated in an Activator-2S planetary mill at an angular acceleration of 40g for 10 min, results in an explosive temperature increase. According to X-ray diffraction analysis and scanning electron microscopy, the thermal explosion is caused by the synthesis of titanium carbide through the reaction of carbon with titanium contained in the Fe2Ti and FeTi intermetallic compounds. The thermal explosion products, in addition to titanium carbide, contain metallic iron reduced by carbon and a small amount of unreacted Fe2Ti intermetallic compound. To fully complete the synthesis reaction and obtain only the target products (titanium carbide and iron), an increased duration of mechanical activation of the powder mixtures is required.
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