of fast grain growth and are not cost-effective. Therefore, in this
work, only the sintering temperature of 1050 C is focused on, albeit
with different additive amounts. Fig. 1 presents the effect of the
additive content, from 0 to 6 wt%, on the porosity features, suggesting
the evolution of densification with increasing the additive
content. Sintered densities measured by the water Archimedes
method have been reported in Ref. [6]. Note that, as indicated in
Fig. 2, the addition of 8 wt% sintering aid leads to the detrimental
phenomenon of spoiling due to the high level of liquid formed
during sintering; thus, the higher contents were not tested.