Abstract
In this paper, solvent debinding of injection molded metal powder by organic solvents of high flashing point was studied. The binder was composed of polyplopylene, paraffin wax and urethane wax. The urethane wax was suitable for rapid solvent debinding by high flashing point organic soIvent. DecaIin(f.p.54.9°C) and Tetralin (f.p.80.2°C) were used as high flashing point organic solvent. The solvent debinding with Decalin and Tetralin was compared with Xylene(f.p.25.6-29.4°C) and Dichloromethane (b.p.40.0°C). flecalin and Tetralin at 50°C exhibited as high extraction ability as Xylene at 20°C. Furthermore, the solvent mixtures(Dichloromethane:Decalin=5:5, 4:6, 3:7) at 50°C exhibited higer extraction ability, and it was comparable with the extraction ratio of Xylene at 50°C to be higher temperature than the flushing point. However, as the organic solvents of high flashing point have the slow volatilization property, it was necessary to dry in vacuum or in blower after solvent extraction. In spite of the fact, it was proved that the organic solvents of high flashing point can be effectively used as substitute for the conventional solvents.
