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Abstract <p>Samples of silicon nitride-based composite ceramic material were produced using a developed technology, using hot casting followed by reaction sintering, as well as “gentle” thermal-oxidative surface preparation to enhance the material’s heat resistance, thereby ensuring the required characteristics of products made from these materials. A microstructural study of the samples, with and without additional oxidation, was conducted using scanning electron microscopy and energy-dispersive secondary and backscattered electron analysis. A detailed structural analysis revealed that the matrix is primarily composed of sintered grains of silicon nitride Si<sub>3</sub>N<sub>4</sub>, interspersed with silicon oxynitride Si<sub>2</sub>N<sub>2</sub>O. Modification of the silicon-oxygen network with aluminum cations increases its viscosity, which positively impacts its resistance to mechanical entrainment in high-speed gas flows.</p>

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Microstructural X-Ray Studies of Silicon Nitride-Based Composite Ceramic Material

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • A. N. Astapov,
  • S. A. Sitnikov,
  • O. A. Butusova,
  • V. V. Spiryagin,
  • S. A. Kolesnik

摘要

Abstract

Samples of silicon nitride-based composite ceramic material were produced using a developed technology, using hot casting followed by reaction sintering, as well as “gentle” thermal-oxidative surface preparation to enhance the material’s heat resistance, thereby ensuring the required characteristics of products made from these materials. A microstructural study of the samples, with and without additional oxidation, was conducted using scanning electron microscopy and energy-dispersive secondary and backscattered electron analysis. A detailed structural analysis revealed that the matrix is primarily composed of sintered grains of silicon nitride Si3N4, interspersed with silicon oxynitride Si2N2O. Modification of the silicon-oxygen network with aluminum cations increases its viscosity, which positively impacts its resistance to mechanical entrainment in high-speed gas flows.