Binder development for powder injection molding at the example of alumina
Powder injection molding is a manufacturing process for near-netshape-manufacturing of geometrically complex ceramic and metallic component parts. The binder as a temporary vehicle for molding plays an important role during the mold filling phase and for the quality of the products. In the course of the examinations a binder for injection molding of alumina powder with a powder volume content of (D = 60 vol.-% was developed according to different aspects. In order to be able to judge the function of the 14 examined binders, their different components were changed systematically. Here the wetting agent turned out to be of vital importance. It proved to be favorable to limit the polymer component to 30 mass percent related to the binder to obtain an adequate flowability. For the debindering cycle the degradation mechanism of the polymer component has the main influence on the parts quality.