Research On Ceramic Injection Molding And Debinding Technology

Debinding is the key process for Ceramic Injection Molding (CIM). From the thermal debinding aspect, this paper studied the treatment of the ceramic powder, the receipt of the CIM binder and the thermal debinding and both the technology and the mechanism for the liquid phase debinding and the gas phase debinding. Finally, got an optimized technology.For the ceramic powder treatment, studied the effect of the calcining process on the ceramic particle size, the angle of the ceramic powder slope and the viscosity of the feed, also optimized the calcining process; studied the effect of adding surfactant when balling the ceramic powder, and found that adding the surfactant appropriately could improve the efficiency of the balling. For this reason, the viscosity of the molding feed could be improved a lot.For the study of the binder receipt, studied the thermal character of the PW+EVA+SA binder system using the thermal analyzing technology. Got the thermal weight-loss curve of the binder system using both the calculating method and the testing method, and the two curve were nearly similar, then raised a parameter which could quantitatively assess the debinding character of the different binder system—debinding inertia; Studied the relationship between the binder receipt and the molding feed viscosity, molding green part strength and debinding character. Finally, raised the design philosophy for the PW+EVA+SA binder receipt.For the aspect of the debinding process of the molding green part, studied the effect of the absorbent under the thermal debinding condition. Found that the constitution of the absorbent could affect the debinding efficiency greatly; for the liquid phase debinding temperature extent, the mechanism of the absorbent is capillary action, 100~200 screen mesh alumina powder had the best debinding efficiency at 130℃; for the gas phase debinding temperature extent, adding some active carbon to the absorbent could control the formation of the hyperoxide barrier lay, accelerate the mass transfer rate, also enhance the debinding efficiency; studied the relationship between the debinding efficiency and the shape of the green part and the solid load; furthermore, did trial study on the solvent debinding.