Abstract
Spark plasma sintering, as a novel powder solidification technology, is applied in this study to sinter Si3N4/MgO powder. The highest relative density [Formula: see text] of 97.14% and Vickers hardness of 1650[Formula: see text]HV are obtained at a soaking temperature of 1750∘C. A steady-state creep mode is utilized to study the densification mechanism of the Si3N4/MgO powder by computing its densification rate [Formula: see text] and further effective stress exponent [Formula: see text] in the soaking period. The results show that [Formula: see text] at soaking temperatures ranging between 1600∘C and 1650∘C, which indicates that its densification mechanism is grain boundary sliding. By contrast, [Formula: see text] at the aforementioned constant soaking temperature ranges indicates that its densification mechanism transformed into dislocation climb-dominated creep. With the soaking temperature further increasing to 1700–1750∘C, the densification mechanism is revealed to be grain boundary diffusion at [Formula: see text]. In addition, the activation densification [Formula: see text] of the Si3N4/MgO powder is calculated to be 206[Formula: see text]kJ/mol at soaking temperatures ranging between 1600∘C and 1650∘C under the determined [Formula: see text].
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