Abstract
For the injection molding of metallic powder, the binder which consists of polystylene, polybutyl-methacrylate, wax, and stearic acid was used. When the molding compound was injected in the mold, wax was separated from the other binder. To prevent the separation of wax, the addition of APP(atactic polypropyrene) was very effective. Because APP has good compatibility with other polymers, APP plays a roll to bind wax with other binder. The effect of the addition of APP varied with the ratio of APP and wax, how much molecular weight APP has, and what structure APP has. The green part was debinded by the thermal way, heating from room temperature to 320°C in the air for 49 hours. The debinded part was sintered at 1320°C under a vacuum of 10 ?? Torr for 2 hours. The sintered part has a relative density of 95-96%. A little decrease of Cr was caused by this debinded and sintered process. But after the surface protection was given, it doesn't matter to the corrosion resistance.
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