The thermal debinding of the residual amounts of binders is one of the most important and difficult steps of MIM-technology. The quality of the sintered part and the production cost are strongly determined by this step. Incorrect debinding parameters could lead to cracks caused by shrinking, stresses or by gas inclusions. Rough surfaces, pores, bubbles and the loss of the shape are further effects. For improving the debinding process of a Feedstock from carbonylic iron and an Alternative-Binder-System (ABS) based on polyamide, the sintering process with different heating rates, sintering time and temperature and sintering atmosphere were intensively investigated. It was determined that lower heating rates lead to an better debinding. In this paper, a probable debinding method for improving the homogeneity in shape, shrinkage and structure will be presented and discussed.
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