The evolution of the microstructure and the dimension of as-molded parts were studied on the basis of the thermogravimetric analysis of wax-based MIM binder. The results show that the binder removal speeds are different in different temperature ranges during binder removal process. The evolution of the microstructure of as-molded parts during binder removal process clearly showed the initiation and formation of connected pore structure , which is the removal chan-nel of the binder. The as-molded parts almost continuously shrank through binder removal process, except an expansion stage during 320～440℃, which is the dissolution expansion effect due to the dissolution of VPW in the polymer melt.

The 1724PH stainless steel compacts sintered at 1 380 ℃for 90 min have the best me2 chanical properties and the good microstructure with homogeneously distributed pore structure and the moderate2sized grains. Whereas the compacts sintered for 60 min and 120 min show an inadequate and an over2sintered microstructure re2 spectively. The compacts sintered at 1380 ℃for 90 min have the density of 7.70g/cm3, the strength of 1275MPa, the elongation of 5%, and hardness of HRC36. With the increase of sintering temperature, the density, strength and hard2 ness increase, while the elongation decreases. The 1724PH stainless steel has good corrosion resistance, showing an activa2 tion2passivation polarization curve. But the passivation potential range is narrow and the spot corrosion potential is low, in2 dicating a low anti2spot corrosive properties.

The fundamental rheological properties of metal injection molding (MIM) feedstock and binder are theoretically analysized. The viscosity of MIM binder and feedstock at different temperature and at different shear rate was measured and evaluated. The results indicated that MIM binder and feedstockpossess pseudoplastic rheological behavior. The Fe-Ni MIM feedstock prepared has the lower value of flow activation energy and the higher value of strain sensitivity exponent . Its injection and filling properties are good.

对不同比例组成的PW-EVA-SA金属注射成形粘结剂进行了粘度测量并比较了其流变性能。对粘结剂、粘结剂各组元和注射料进行了TGA和DTA实验，对其热解行为进行了分析。

研究了粘结剂配方、粉末装载量、喂料热力学性质、注射成形工艺等多个因素对金属注射成形17-PH不锈钢脱脂保形性的影响。结果表明具有较高热分解温度、较低熔解热的HDPE作为第2组元的蜡基粘结剂，具有比采用EVA为第2组元的粘结剂更好的保形性能。试样变形率随着粉末装载量、注射压力、注射温度的增加而下降，而且存在一最佳的工艺条件，包括粉末装载量、注射压力、注射温度，此时试样最不容易变形，试样变形比例最小。