Effects of binder systems for metal injection moulding

In order to create powder metallurgical parts with a more complex and uniform shape, metal injection moulding (MIM) is one method.

The existing binder systems and production routes are accounted for in an extensive litterature survey.

Wax-based systems and water-based systems are presented as of their production process and debinding method. Their fabrication method consists mainly in mixing the powder and the binder together, injecting the mixture into a mould with an extruder, debinding and sintering the parts. Debinding can be made in different ways like solvent debinding, thermal debinding, catalytic debinding or supercritical debinding.

The influence of the binder and the powder on the rheological behaviour of the feedstock is the object of the practical study. This study shows that the viscosity measurement helps to avoid the flow instabilities conditions of the feedstock depending on the temperature, the binder composition, the binder content and the powder. To help the viscosity to decrease,it is possible to increase the process temperature, the binder content, the amount of surfactant or mix powders with different particle size. By adding a surfactant, varying the binder composition or mixing powders with different particle size and shape, the critical solids loading could increase.

Author: Porter, Marie-Aude

Source: LuleƄ University of Technology

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