The effect of processing conditions, amount of additives and composition on the microstructures and mechanical properties of α-SiAlON ceramics

S. Kurama, M. Herrmann, H. Mandal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

A series of samples with yttrium α-SiAION compositions and different amounts of additive has been fabricated from α-Si3N4, AIN, Al2O3 and Y2O3 starting powders, using gas pressure sintering and three different sintering procedures. One series of samples was heated up to 1825°C and then held for 3 h, another group of samples was held at a lower temperature (1500 or 1600°C) for 1 h and then heated up to 1825°C and held for 3 h. The results of investigations using scanning electron microscopy showed the effect of composition and sintering procedure on the morphology of α-SiAION grains. It was found that the amount of elongated grains increased with increasing amount of liquid phase. The mechanical tests showed that all of the samples exhibited HV10 values in the range of 1800-1976 kg/mm and KlC values in the range of 3.9-6.3 MPam1/2.

Original languageEnglish
Pages (from-to)109-119
Number of pages11
JournalJournal of the European Ceramic Society
Volume22
Issue number1
DOIs
Publication statusPublished - Jan 2002
Externally publishedYes

Keywords

  • Grain morphology
  • Mechanical properties
  • Microstructure-final
  • SiAlONs
  • Sintering

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