Low temperature synthesis of AlN by addition of various Li-salts

Yoshikazu Kameshima, Masaki Irie, Atsuo Yasumori, Kiyoshi Okada

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The effect of various Li-salts on the low temperature synthesis of AlN by direct nitridation of Al metal was investigated using four Al powders with average particle sizes of 3, 20, 100 and 150 μm. These were mixed with various Li-salts (LiNO3, LiOH·H2O and Li2CO3) in different concentrations and fired at various temperatures under flowing N2. The as-received Al powders without Li addition showed AlN formation at about 600 °C in the 3 and 20 μm samples but no AlN formation up to 850 °C in the 100 and 150 μm samples. The crystallinity of the AlN products, where formed, was however low. By contrast, all the Al powders with added Li-salts showed AlN formation up to 800 °C, with LiOH·H2O being especially effective. Thus, the AlN formation temperature can be significantly lowered in the coarser powders by the addition of Li-salts but the effect is less in the finer powders which undergo low temperature nitridation below the melting point of Al metal even without Li. The crystallinity of the AlN products was higher in the samples containing Li-salts than without Li-salts.

Original languageEnglish
Pages (from-to)3801-3806
Number of pages6
JournalJournal of the European Ceramic Society
Volume24
Issue number15-16
DOIs
Publication statusPublished - Dec 1 2004
Externally publishedYes

Keywords

  • Al
  • AlN
  • Crystallization
  • Nitridation
  • Phase development

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Low temperature synthesis of AlN by addition of various Li-salts'. Together they form a unique fingerprint.

  • Cite this