Influence of the yttria powder morphology on its densification ability

Abstract

:The present paper shows that we can predict the densification capacity of an yttria powder in relation with its grain shape by using a simple thermodynamic model. All other parameters, such as temperature, time, sintering atmosphere and nature of the powder are fixed. The values of the relative density and grain size of the final ceramic strongly depend on the shape of the grain of the initial powder. A simple model is proposed to understand these differences and to give tools to predict, step by step the densification capacity of a powder. This study could be extended to powders of different nature

Synthesis and Consolidation of BaAl2Si2O8:Eu: Development of an Integrated Process for Luminescent Smart Ceramic Materials

“…These collapsed powders are then sintered without significant grain growth. Dupont et al 58 proposed a similar mechanism for yttria powders, in which the first step during sintering corresponded to the rearrangement of individual particles into a full packing of spheres to eliminate porosity, followed by full densification and grain growth.…”

Combustion synthesis of Y2O3 and Yb–Y2O3

“…After calcination, it was observed that the individual particles which occurred at the stage of crystal growth during heat treatment. At high temperature, the flaky and platelets structure broke into nanometric spherical particles (Dupont et al, 2005). It was also observed that the agglomerates of thin flakes with a smooth surface, perforated by many large pores.…”

Thulium Oxide Nanopowders Obtained by Precipitation

“…The rare‐earth oxide powders can be prepared in many ways, for example, precipitation, hydrothermal synthesis, solgel, and combustion method …”