Mechanochemical processing of sialon compositions

Kenneth J D MacKenzie, Jadambaa Temuujin, Mark E. Smith, Kyoshi Okada, Yoshikazu Kameshima

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Milling for 48 h in a sealed planetaryball mill was found to facilitate sialon formation in mixtures of aluminium and silicon oxides and nitrides on further heating in nitrogen at 1200-1600 °C. 27Al and 29Si MAS NMR indicated that milling exerts more influence on the oxide components than on the nitrides. Substitution of γ-Al2O3 byAl(OH)3 as the alumina source facilitated the mechanochemical formation of Si-O-Al bonds, as monitored byMAS NMR, but the subsequent thermal conversion of these precursors to stable aluminosilicates did not enhance sialon formation. Milled precursors of b-sialon composition formed a mixture of β, O and X-sialon, decomposing to polytypoid sialons at 1600 °C. Milled O-sialon precursors formed monophase O-sialon at 1600 °C, while some X-sialon compositions formed X-sialon at 1400 °C which decomposed to mullite and corundum at 1600 °C. A ground mixture of Ca α-sialon composition formed β, O and X-sialons at 1600 °C, but no Ca sialon because of the depletion of Ca bythe preferential formation of a Ca feldspar. Without milling, all these mixtures were unreactive, and generallydid not form sialons on heating in nitrogen up to 1600 °C.

Original languageEnglish
Pages (from-to)1069-1082
Number of pages14
JournalJournal of the European Ceramic Society
Volume23
Issue number7
DOIs
Publication statusPublished - Jun 2003
Externally publishedYes

Fingerprint

Aluminum Oxide
Processing
Chemical analysis
Nitrogen
Nuclear magnetic resonance
Heating
Feldspar
Corundum
Mullite
Aluminosilicates
Silicon oxides
Aluminum
Silicon nitride
Nitrides
Oxides
Substitution reactions
Alumina
aluminosilicate
Hot Temperature
feldspar

Keywords

  • Mechanochemical processing
  • Milling
  • Phase development
  • Sialons
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Mechanochemical processing of sialon compositions. / MacKenzie, Kenneth J D; Temuujin, Jadambaa; Smith, Mark E.; Okada, Kyoshi; Kameshima, Yoshikazu.

In: Journal of the European Ceramic Society, Vol. 23, No. 7, 06.2003, p. 1069-1082.

Research output: Contribution to journalArticle

MacKenzie, Kenneth J D ; Temuujin, Jadambaa ; Smith, Mark E. ; Okada, Kyoshi ; Kameshima, Yoshikazu. / Mechanochemical processing of sialon compositions. In: Journal of the European Ceramic Society. 2003 ; Vol. 23, No. 7. pp. 1069-1082.
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