6. Chemistry and sintering

To accelerate the sintering process, one or more chemical compounds, called additives, are often added to create either a liquid phase (this case will be studied later in the dossier) or a liquid phase (this case will be studied later in the dossier). ), either enter solid solution (solid state chemistry refers to this as a dopant), or form a second phase. Impurities, constituents whose existence or concentration is sometimes unknown, can play the role of sintering additives.

We know that, in oxides, diffusion occurs in particular via point defects: interstitials or vacancies. The concentration of these defects is determined by temperature, atmosphere, and the nature and concentration of the dopant (or impurity). Solid chemistry, synthesis conditions and processing atmospheres therefore have a decisive influence on the sintering process....