Abstract
A thermal treatment causes occasionally some defects for green body like cracks or blisters in a binder removal stage of the ceramic injection molding process.
A debinding mechanism by heating for the injection molded alumina contained the EVA and Wax is investigated in this study. By means of observations of a cross section of the alumina compact in the heating process, it has been found that the brown layer, formed at the surface, advances into the compact during the process. The non-degraded binder as a white region has been also observed inside of the layer.
The surface layer is postulated as a kind of reactant in the heating process. From the result of the analysis of kinetics for the reaction system, the rate determining step will be proposed for a reaction at the interface between the brown surface layer and the white inner region.
