Texturing Ca-α-sialon via strong magnetic field alignment

Xinwen Zhu, Tohru S. Suzuki, Tetsuo Uchikoshi, Yoshio Sakka

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper reports a dense textured single Ca-α-sialon fabricated by strong magnetic field alignment (SMFA) during non-aqueous slip casting of α-Si3N4, CaCO3, Al2O 3 and AIN starting powders, followed by reaction pres-sureless sintering at 1800°C, XRD analysis reveals that the orientation of the α-Si3N4 crystals occurs with the c-axis perpendicular to the magnetic field during slip casting. It is shown that the formation of the single Ca-α-sialon is complete within 5 min and nearly complete densification is achieved within 60 min. SEM observation reveals that the textured Ca-α-sialon is featured by the long-axis (c-axis) of large elongated grains perpendicular to the magnetic field. The texturing mechanism is attributed to the heterogeneous nucleation and epitaxially elongated growth on the initially oriented α-Si3N4 seeds. The prolonged sintering leads to a higher orientation as a result of the promoted grain growth.

Original languageEnglish
Pages (from-to)701-705
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume115
Issue number1347
DOIs
Publication statusPublished - 2007 Nov
Externally publishedYes

Keywords

  • Ca-α-sialon
  • Pressurelss sintering
  • Slip casting
  • Strong magnetic field
  • Texture

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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