Effect of Energy on the Phase Composition of the Product of Arc Discharge Synthesis in the Tungsten–Carbon System Obtained in a Self-Shielding Autonomous Gas Environment

A. Ya Pak, A. I. Kokorina

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: The paper presents the results of experimental studies on the preparation of ultrafine powder materials of the tungsten-carbon system in the plasma of a direct current arc discharge initiated in ambient air. According to the results of X-ray diffractometry, transmission electron microscopy, scanning electron microscopy, and elemental analysis, the product contains microsized and nanoscale crystalline objects that are carbon graphite-like materials gC, tungsten carbides WC and W2C with a hexagonal structure, and tungsten W with a cubic structure. As a result of a series of experiments, the possibility of influencing the phase composition of the synthesis product by the amount of energy supplied, which is linearly dependent on the duration of the arc discharge, was established. In this case, tungsten oxide phases were not found in the composition of the synthesis products within the framework of the applied analytical techniques. The process of obtaining non-oxide materials during the generation of a direct current arc plasma in the presence of carbon and tungsten is possible owing to the intense generation of carbon monoxide and carbon dioxide gases, which shield the reaction volume from atmospheric oxygen. Thus, in the framework of the presented work, the possibility of controlling the phase composition of the product of vacuumless arc synthesis in the tungsten-carbon system by changing the duration of the discharge burning at a constant direct current was shown for the first time.

Original languageEnglish
Pages (from-to)544-550
Number of pages7
JournalInorganic Materials: Applied Research
Volume12
Issue number2
DOIs
Publication statusPublished - Mar 2021

Keywords

  • arc energy
  • arc synthesis
  • synthesis duration
  • tungsten carbide
  • vacuumless method

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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