Journal of Materials Science

, Volume 30, Issue 21, pp 5531–5536 | Cite as

Hot hardness of Si3N4-based materials

  • R. F. Silva
  • J. M. Vieira


The Vickers hardness of dense Si3N4 ceramics of the Si-Ce-Al-O-N system was investigated from room temperature to 1200°C. A sloppy decrease of hot hardness occurred above 850–900°C. A compensation law was observed between the pre-exponential factors of the hot-hardness dependence on the reciprocal of absolute temperature, and the values of the activation energy of hardness. This relationship shows that the low-temperature deformation mechanism, such as microplasticity, is competing in parallel with a grain-boundary diffusion-controlled creep process in the high-temperature range.


Polymer Activation Energy Material Processing Absolute Temperature Deformation Mechanism 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • R. F. Silva
    • 1
  • J. M. Vieira
    • 1
  1. 1.Departamento Eng. Cerâmica e VidroUniversidade de AveiroAveiroPortugal

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