Scholarlink

<p>The spark plasma extrusion (SPE) is a recent innovative technique, an adaptation of SPS, in which the sintering dies are designed and set to produce enlarged geometries starting from powders. This work aims to evaluate the effect of tooling design by SPE to identify which configuration yields the most favorable properties in the consolidated specimens. For this purpose, two geometries of the graphite dies were fabricated: one designed for direct extrusion and the other for indirect extrusion. Commercial α-Si₃N₄ powders were used as the starting material, with Y₂O₃ and Al₂O₃ serving as sintering additives in equal proportions. The processing parameters were kept constant, including the heating rate of 300&#xa0;°C/min, a maximum sintering temperature of 1500&#xa0;°C, and a holding time of 5&#xa0;min, while the applied pressure was varied. The results indicate that the direct extrusion die set produced superior densification and promoted a greater α-to-β phase transformation.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Advances in silicon nitride ceramics manufacture with complex geometry by spark plasma extrusion

  • 期刊论文

  • 发表日期：

    2025年10月20日

查看全文
  • Silvia Betzabeé Alemán-Córdova,
  • José Reyes-Gasga,
  • Sebastián Díaz-de la Torre,
  • Leonel Ceja-Cárdenas

摘要

The spark plasma extrusion (SPE) is a recent innovative technique, an adaptation of SPS, in which the sintering dies are designed and set to produce enlarged geometries starting from powders. This work aims to evaluate the effect of tooling design by SPE to identify which configuration yields the most favorable properties in the consolidated specimens. For this purpose, two geometries of the graphite dies were fabricated: one designed for direct extrusion and the other for indirect extrusion. Commercial α-Si₃N₄ powders were used as the starting material, with Y₂O₃ and Al₂O₃ serving as sintering additives in equal proportions. The processing parameters were kept constant, including the heating rate of 300 °C/min, a maximum sintering temperature of 1500 °C, and a holding time of 5 min, while the applied pressure was varied. The results indicate that the direct extrusion die set produced superior densification and promoted a greater α-to-β phase transformation.

Graphical abstract