Abstract
Abstract The influence of the sintering additive LiYO2 (5–15wt.%) on sintering behavior, microstructure and mechanical properties of Si3N4 ceramics was investigated. Since LiYO2 enables densification of Si3N4 at extraordinarily low temperatures, sintering was carried out in the range from 1200–1700°C. Densification was found to be enhanced with increasing additive content due to an increasing volume fraction of the liquid. The phase transformation and grain growth occurred through a solution-reprecipitation mechanism, where the precipitation took place preferentially on pre-existing -Si3N4 nuclei (of which the starting powder already contained 20wt.%). The indentation fracture toughness increased with both sintering time and additive content as a result of the growth of elongated grains.
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