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<p>New processing techniques or innovations are sought to generate pieces with geometric complexity without losing mechanical properties. One of the innovations for sintering is the modification to the spark plasma sintering equipment, referred to as Spark Plasma Extrusion (SPE), which allows for the simultaneous sintering and extruding of the material. Considering one of the specific characteristics of silicon nitride requires liquid phase sintering, SPE enables it. For forming the liquid phase, the use of additives generally employed in metal oxides, such as Y<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3,</sub> is mandatory. In the present work, the characterization of a sintered and simultaneously extruded silicon nitride piece was carried out to determine whether the structural changes are due to the sintering process modification. To this, a sample with 20% by weight of Y<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> additives was analyzed, and different areas of cross-section samples were examined by SEM and TEM.</p> Graphical abstract <p></p>

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Structural characterization by SEM and TEM of the sinter-extruded Si3N4

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Silvia Betzabeé Alemán-Córdova,
  • José Reyes-Gasga,
  • Jesús Rafael González-Parra,
  • Sebastián Díaz-de la Torre,
  • Leonel Ceja-Cárdenas

摘要

New processing techniques or innovations are sought to generate pieces with geometric complexity without losing mechanical properties. One of the innovations for sintering is the modification to the spark plasma sintering equipment, referred to as Spark Plasma Extrusion (SPE), which allows for the simultaneous sintering and extruding of the material. Considering one of the specific characteristics of silicon nitride requires liquid phase sintering, SPE enables it. For forming the liquid phase, the use of additives generally employed in metal oxides, such as Y2O3 and Al2O3, is mandatory. In the present work, the characterization of a sintered and simultaneously extruded silicon nitride piece was carried out to determine whether the structural changes are due to the sintering process modification. To this, a sample with 20% by weight of Y2O3 and Al2O3 additives was analyzed, and different areas of cross-section samples were examined by SEM and TEM.

Graphical abstract