Abstract
The activation energy of two Si3N4/MgO materials, fabricated in the Si3N4-Si2N2O-Mg2SiO4 compatibility triangle of the Si-Mg-O-N system, was determined between 1300 and 1400° C under a compressive stress of 275 MPa. The activation energy of the material previously shown to exhibit pure diffusional creep was determined to be 660 kJ mol−1, whereas the material shown to exhibit extensive cavitational creep had an activation energy of 1080 kJ mol−1. These results are compared with results obtained by others for densification and slow crack growth.
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Lange, F.F., Davis, B.I. Compressive creep of Si3N4/MgO alloys. J Mater Sci 17, 3637–3640 (1982). https://doi.org/10.1007/BF00752208
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DOI: https://doi.org/10.1007/BF00752208