Research Progress of Mechanism and Process of Thermal Debinding in 3D-Printed Ceramic Green Body.

Organic binders are always necessary for the fabrication of advanced ceramics by 3D-printing, which are mainly discharged from the ceramic green bodies through a thermal debinding process. Thermal debinding process of organic binders thus has a significant impact on the quality of 3D-printed green bodies and is crucial for fabricating high-quality advanced ceramics to implement applications. Theory and practice in the thermal debinding process of the representative 3D-printed green bodies were reviewed. Based on the composition and function of organic binders, the heat removal methods of different molecular weight organic binders were compared. The interaction between organic binders and ceramic particle surface and the effect of degreasing atmosphere on thermal degradation of organic binders were discussed. Then the thermal debinding process was divided into three stages and the development of the green body structure was described. Three mass transfer channels were analyzed: liquid was transferred by the capillary force, vapor diffused in the liquid phase, and vapor diffused or permeated through the pore nets. Origin causes of the defects such as cracks and distortion lying in the thermal debinding process and the previous steps were analyzed and some control measures were put forward. [ABSTRACT FROM AUTHOR]