Chapter 48. Pressing and Sintering Developments of Freeze Granulated Si3N4 Materials

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Ola Lyckfeldt1,
  2. Daniel Käck1 and
  3. Kent Rundgren2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294826.ch48

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

How to Cite

Lyckfeldt, O., Käck, D. and Rundgren, K. (2003) Pressing and Sintering Developments of Freeze Granulated Si3N4 Materials, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294826.ch48

Author Information

  1. 1

    Swedish Ceramic Institute, P. O. Box 5403, SE-402 29 Göteborg, Sweden

  2. 2

    Permascand AB, P. O. Box 42, SE-840 10 Ljungaverk, Sweden

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375846

Online ISBN: 9780470294826

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Keywords:

  • sintering schedule;
  • microstructural;
  • freeze-granulated;
  • uniaxial pressure;
  • higher green density

Summary

The effects of binder type, pressing cycle, and sintering schedule on the mechanical and microstructural properties of freeze-granulated Si3N4 materials have been studied. Produced materials were based on a medium-cost, directnitrided, powder (SicoNide P95H, Permascand AB) and a sintering-aid composition consisting of Y2O3, Al2O3, and Fe2O3. The pre-processing included wet milling and freeze granulation to obtain favourable pressing and sintering performance. It was shown that a pressing-aid composition of PVA/PEG favoured the compaction at pressing whereas PEG/PEG gave better sintering performance. Further, a higher initial uniaxial pressure at pressing (higher green density) tended to support grain growth that resulted in improved fracture toughness.