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Influence of the Mechanical Activation of a Titanium–Carbon Mixture on SHS Pressing Parameters and the Consolidated Titanium Carbide Microstructure

  • SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
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Russian Journal of Non-Ferrous Metals Aims and scope Submit manuscript

Abstract

This paper studies the effect of mechanical activation (MA) modes when stirring a stoichiometric mixture of titanium and soot powders in a ball mill on the properties of mixtures, combustion parameters, relative density, and the microstructure of consolidated titanium carbide samples obtained by SHS. MA conditions for Ti + C reaction mixtures in a ball mill are determined. An increase in the mass of grinding bodies activates the MA mechanism. It is shown that the greatest effect from MA is obtained with a two-stage preparation of mixtures: firstly, the titanium powder is activated separately and then the components are mixed together; this process includes not only their mixing, but also the activation of soot powder. It is found that combustion behavior is affected by the activation of not only titanium, but also soot. After the MA of both components, an anomalous increase in the burning rate (more than 100 cm/s) is found on pressed samples. At the bulk density, there is no effect of MA on the mixture combustion process, since in this case the burning rate of all mixtures is in the range of 1.5–2.5 cm/s. It is revealed that the MA of reagents for pressed samples leads to an increase in the combustion temperature, an increase in the relative density of the consolidated refractory product to 93–95%, and a decrease in the average size of TiC grains. A decrease in the residual porosity of consolidated TiC is due to an increase in the hot-pressing temperature and plasticity of the product synthesized during the reaction mixture combustion after MA. The main reason is an increase in the exothermic interaction rate. It is shown that MA when mixing reagents makes it possible to control combustion parameters and the microstructure of consolidated products and opens up new opportunities for obtaining refractory materials featuring a unique structure and properties by SHS pressing.

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Russia

    Yu. V. Bogatov, V. A. Shcherbakov & I. D. Kovalev

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  1. Yu. V. Bogatov
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  2. V. A. Shcherbakov
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  3. I. D. Kovalev
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Correspondence to Yu. V. Bogatov, V. A. Shcherbakov or I. D. Kovalev.

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Translated by A. Muravev

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Bogatov, Y.V., Shcherbakov, V.A. & Kovalev, I.D. Influence of the Mechanical Activation of a Titanium–Carbon Mixture on SHS Pressing Parameters and the Consolidated Titanium Carbide Microstructure. Russ. J. Non-ferrous Metals 62, 585–591 (2021). https://doi.org/10.3103/S1067821221050011

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