INFLUENCE OF ENERGY ON PHASE COMPOSITION OF END-PRODUCT OBTAINED BY VACUUM-FREE ELECTRIC ARC SYNTHESIS OF CUBIC SILICON CARBIDE

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Abstract


The paper describes the scientific and technical basis of the vacuum-free plasma method for obtaining silicon carbide realized by DC arc discharge between graphite electrodes. In a series of experiments the energy supplied to the system was changed by increasing the duration of arc discharge with the constant value of current intensity (165 A); two precursor types were used: a mixture of silicon powder with X-ray amorphous carbon in the microfiber form in the first case and with carbon powder in the second case; the mass ratio in the initial mixture was Si:C = 2:1. As a result of the evaluation of the synthesis product quantitative composition, the experimental parameters that allow to achieve the maximum content of the target silicon carbide phase (up to 45%) are determined. Moreover, it was possible to determine the parameters when the only impurity phase in the product was graphite; as a result, the purification of the product from unbound carbon and thereby obtaining silicon carbide with ~99% content was successfully performed by atmospheric furnace heating at a temperature of 900 °C. This result is ensured by two factors: the presence of carbon fibers in the initial reagents mixture and a sufficient level of the supplied energy of about 216 kJ/g.


About the authors

Aleksandr Y Pak

Tomsk Polytechnic University

Author for correspondence.
Email: ayapak@tpu.ru
30, Lenin Avenue, Tomsk, 634050, Russian Federation

Candidate of Technical Sciences, Associate Professor of the automation and robotics department of the information technology and robotics engineering school, Tomsk Polytechnic University. Research interests: powder materials, carbides, carbon materials, electricdischarge methods of synthesis, phase transformations

Gennadii Ya Mamontov

Tomsk Polytechnic University

Email: gmamontov@tpu.ru
30, Lenin Avenue, Tomsk, 634050, Russian Federation

Doctor of Physics and Mathematics, Professor of automation and robotics department of the information technology and engineering school, Tomsk Polytechnic University. Research interests: thermodynamics, mathematical statistics, high-temperature processes, fast processes

Ol’ga A Bolotnikova

Tomsk Polytechnic University

Email: bolotnikovaoa@gmail.com
30, Lenin Avenue, Tomsk, 634050, Russian Federation

student of electric power and electrical engineering department, Tomsk Polytechnic University. Research interests: silicon carbide, electric discharge methods of synthesis.

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Copyright (c) 2018 Pak A.Y., Mamontov G.Y., Bolotnikova O.A.

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