The injection molding of S-50C powder(19.7μm in average diameter)was carried out with the SA(special-acrylate copolymer)-APP(atactic polypropyrene)-Wax binder system.S-50C powder was mixed with the binder at 140°C.The molding composition was 54.2%S-50C powder, 19.5%SA, 10.7%APP, 11.3%Wax and 4.3%dibutyl phthalate in volume.The green body was debinded during heating from room temperature to 320°C in the air.The debinded specimen was sintered at 1100 to 1220°C under vacuum of 10^-4 Torr.The main results are summmarized as follows:
1)This binder system has good mixing, molding and binder removal characteristics.
2)A specimen sintered at 1220°C for 90min has a relative density of 92.2% and shows average tensile strength of 23.8Kg/mm²
3)Sintered specimen are observed decarburization from surface under vacuum sintering.