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Journal of Materials Science

, Volume 41, Issue 18, pp 6062–6068 | Cite as

Fabrication of yttrium-stabilized α-SiAlON powders with rod-like crystals by combustion synthesis

  • Guanghua Liu
  • Kexin Chen
  • Heping Zhou
  • Xiaoshan Ning
  • C. Pereira
  • J. M. F. Ferreira
Article

Abstract

Yttrium-stabilized α-SiAlON powders with rod-like crystals were fabricated by combustion synthesis. Effects of starting compositions including relative content of diluents on final phase assemblage and grain morphology of combustion products were discussed. With appropriate proportions of α-SiAlON seeds and NH4F additive, α-SiAlON powders with rod-like crystals could be fabricated. It was found that the addition of α-SiAlON and NH4F could improve the anisotropic growth of rod-like crystals. However, if too much NH4F was added, the phase purity of combustion products would be decreased obviously and more β-SiAlON was produced. Additionally, the as-synthesized α-SiAlON powders were heat treated at 1800 °C for 1 h to examine their stability at the elevated temperature. The experimental results showed that after the heat treatment, single-phase α-SiAlON was obtained, revealing the high stability of combustion synthesized α-SiAlON powders.

Keywords

Combustion Product Combustion Synthesis NH4F Grain Morphology SiAlON 

Notes

Acknowledgements

This work is supported by National Natural Science Foundation of China (Grant No. 50102002), and by the Foundation for Science and Technology of Portugal, Project FCT SAPIENS–Reference: POCTI/CTM/39419/2001.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Guanghua Liu
    • 1
    • 2
  • Kexin Chen
    • 1
  • Heping Zhou
    • 1
  • Xiaoshan Ning
    • 1
  • C. Pereira
    • 2
  • J. M. F. Ferreira
    • 2
  1. 1.Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine ProcessingTsinghua UniversityBeijingPeople’s Republic of China
  2. 2.Department of Ceramics and Glass EngineeringUniversity of Aveiro, CICECOAveiroPortugal

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