Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)
- 2006.09a
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- Pages.215-216
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- 2006
Molding Properties and Causes of Deterioration of Recycled MIM Feedstock
- Cheng, Li-Hui (Department of Materials Science and Engineering, National Taiwan University) ;
- Hwang, Kuen-Shyang (Department of Materials Science and Engineering, National Taiwan University)
- Published : 2006.09.24
Abstract
To lower the cost of MIM products, the gate and runner materials and green parts with defects are usually recycled. It is necessary to understand what causes the recycled products to deteriorate. The results show that the viscosity of the 1R (recycled once) feedstock was slightly lower than that of the fresh material. However, as the number of recyclings increased, the viscosity increased, while the density decreased, and more defects were noticed duri ng solvent debinding. These deteriorations were mainly caused by the increase of the melting point of the backbone binder and the oxidation of the filler or paraffin wax.