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<p>The paper studies the possibility of synthesizing anorthite ceramics (CaAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub>) from the powder obtained by plasma melting of a&#xa0;stoichiometric mixture composition. It is shown that the best temperature range for sintering is 1100 to 1200 °C, which provides the ceramics density of 2650 to 2700 kg/m<sup>3</sup> (close to theoretical value) at a &lt; 5% porosity. At 1300 °C sintering, the density decreases due to anorthite crystallization and mullite formation that are accompanied by the porosity growth up to 8% and the nanostructure formation in pores. Plasma synthesis assists in the production of the uniform amorphous powder that sinters at temperatures by 100–200 °C lower than in conventional techniques. The material demonstrates its potential in applications in heat-resistant ceramics, electrical insulators and co-fired ceramics due to the low thermal expansion coefficient and high chemical stability.</p>

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Plasma-chemical synthesis of nanostructured anorthite for ceramics production

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • N. K. Skripnikova,
  • O. G. Volokitin,
  • M. A. Semenovykh,
  • M. G. Bruyako,
  • V. A. Ushkov,
  • S. V. Samchenko

摘要

The paper studies the possibility of synthesizing anorthite ceramics (CaAl2Si2O8) from the powder obtained by plasma melting of a stoichiometric mixture composition. It is shown that the best temperature range for sintering is 1100 to 1200 °C, which provides the ceramics density of 2650 to 2700 kg/m3 (close to theoretical value) at a < 5% porosity. At 1300 °C sintering, the density decreases due to anorthite crystallization and mullite formation that are accompanied by the porosity growth up to 8% and the nanostructure formation in pores. Plasma synthesis assists in the production of the uniform amorphous powder that sinters at temperatures by 100–200 °C lower than in conventional techniques. The material demonstrates its potential in applications in heat-resistant ceramics, electrical insulators and co-fired ceramics due to the low thermal expansion coefficient and high chemical stability.