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Kovalcík, J.
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article
Delayed failure behaviour of the ESIS silicon nitride reference material at 1200 °C in air
Abstract
<p>The aim of the present contribution was to study the delayed failure of a commercially available Si<sub>3</sub>N<sub>4</sub>. Static flexure tests at different stresses (150, 200, and 300 MPa) were carried out at 1200 °C in air. The strain and the lifetime of the specimens were recorded, and fracture surfaces were investigated. In all specimens, some creep deformation occurred (more at lower stresses). At the lowest stress, some indication for creep damage (multiple crack growth) could be detected. The lifetime of the specimens is proportional to an inverse power of the applied stress. The stress exponent was determined as n = 7. The low value of this exponent is an evidence that a long-time use of the material at high mechanical loads is only possible at temperatures below 1200 °C. The work was done in the frame of the European Structural Integrity Society (ESIS) Technical Committee for Ceramics (TC6) Reference Material Testing Program (RMTP).</p>