Mechanical properties of sintered Si 3N 4 from powder produced by fluidized-bed direct silicon nitridation

Hiroyuki Y. Suzuki, Shunzo Tashima, Shoichi Kimura

Research output: Contribution to journalArticle

Abstract

Si 3N 4 powder, produced by the fluidized-bed direct nitridation of silicon, was blended with water, compacted by pressure slip casting, and sintered under a pressurized nitrogen atmosphere. Compacts made from the powder showed roughly the same sinterability as those made from commercially available imide-process powder, yielding a hardness of H v 1570, a fracture toughness of 7.2 MPa√m, and a three-point bending strength of 1062 MPa, highest values attainable with Si 3N 4. The powder produced by the fluidized-bed direct nitridation may replace the Si 3N 4 powder from the other process, when water is used for preparing slips. A processing rout is proposed, which may realize a substantial reduction of total cost for producing sintered Si 3N 4 parts.

Original languageEnglish
Pages (from-to)774-777
Number of pages4
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume113
Issue number1324
Publication statusPublished - Dec 2005
Externally publishedYes

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Keywords

  • Fluidized-bed direct nitridation
  • Pressure casting
  • Silicon nitride

ASJC Scopus subject areas

  • Ceramics and Composites

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