Fracture Characteristics of Layered and Nano-Particle Reinforced Si3N4

  • J. Dusza
  • P. Šajgalík
Chapter
Part of the NATO ASI Series book series (ASHT, volume 43)

Abstract

In recent 10–15 years several attempts have been made with the aim of improving the mechanical properties, mainly the flaw tolerance and reliability, of silicon nitride based structural ceramics. As a result, the mechanical and fracture properties were significantly improved. This happened due to a close cooperation of scientists in basic and applied research and due to a detailed study of the microstructure characteristics of silicon nitride based ceramics and the influence of processing steps on microstructure and mechanical properties of these materials as well. The main scientific approaches used for this purpose are the following ones, Fig. 1:
  • The flaw diminution approach — improving the strength characteristics (characteristic strength and Weibull modulus) by reducing the critical defect’s size, [1–5],

  • The flaw tolerance approach — improving the flaw tolerance by activating localized bridges behind the crack tip in the form of mechanisms as frictional and mechanical interlocking or pull out, [6–10],

  • Nano-particle dispersion strengthening — improving the strength values by incorporating nano-sized second phase particles into the matrix, [11–15],

  • The laminar structure approach — improving the structural reliability by designing laminar (layered) composites with a promoted crack deflection at the interlayer boundaries and utilizing compressive residual stresses arisen due to the different thermal expansions of the neighbouring layers, [16–20].

Keywords

Residual Stress Fracture Toughness Silicon Nitride Compressive Residual Stress Layered Composite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • J. Dusza
    • 1
  • P. Šajgalík
    • 2
  1. 1.Institute of Materials ResearchSlovak Academy of SciencesKošiceSlovak Republic
  2. 2.Institute of Inorganic ChemistrySlovak Academy of SciencesBratislavaSlovak Republic

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