Warping evolution of injection-molded ceramics

This study is focused on the shape retention of an injection-molded ZrO2 ceramics from their molded state to their sintered state. Varying mold temperatures (38–55°C) were used for the molding process, and the molded samples were solidified either at a relatively uniform temperature or under an inhomogeneous temperature distribution. Higher mold temperatures, as well as the application of non-uniform temperature distribution across the molding thickness, resulted in a significant increase in the magnitude of the curvature of the molded samples. For all the moldings fabricated, the curvature changed prominently when the moldings were subjected to elevated temperatures; yet, insignificant binder loss was detected at such temperatures. The subsequent curvature evolution after thermal debinding was moderate, but the final sintered deformation was found closely related to the green deformation.