Interface Controlled Decarburisation Model for Injection Moulded Parts During Debinding

Abstract

An interface controlled decarburisation model has been developed to predict the residual carbon contents of injection moulded parts after debinding. In debinding atmospheres consisting of H₂–N₂ mixtures, decarburisation of the parts is controlled by oxidative and reductive reactions in a competitive manner such that there exists a hydrogen concentration that minimises the decarburisation rate. The model indicates that the residual carbon content of the debound parts is determined by the isothermal holding time at the peak debinding temperature and the concentrations of hydrogen and moisture in the debinding atmosphere. PM/0701