The process of thermal debinding of injection molded water atomized 316L stainless steel powder compacts was studied in a vacuum and hydrogen atmosphere using a mercury porosimetry and the thermogravimetric analysis method. The vacuum debinding rate was investigated under the conditions of different binder compositions and temperature-increase rates, especially at the low temperature stage. The process of thermal debinding in the hydrogen atmosphere was compared with that in vacuum. It was found that the binder removal rate was much higher in vacuum than that in the hydrogen atmosphere under the same experimental conditions. The mercury porosimetry was used to measure the pore structure evolution. The results of the mercury porosimetry indicated that the pore structure evolution in injection molded compacts during thermal debinding in vacuum was greatly different from that in hydrogen atmosphere. A fine inter-connected pore structure developed as a result of the evaporation and removal of the low molecular binder components at the early stage of debinding. The reason for the difference in binder removal rate and the inter-connected pore structure in these two debinding environments lies in the difference of the vapor pressure drop, which was the vapor pressure difference between that in the molded compacts and that in the ambient environment. At the different thermal debinding stages and environments, the pore structure evolution and changes in the mean pore size in the thermally debound compacts were also different. From the low debinding temperature stage to the intermediate temperature stage of about 300 8C, the pores in the thermally debound compacts in the hydrogen atmosphere were finer and the pore size distribution was more homogeneous than that in the vacuum. At the final debinding stage, the pore size distribution was almost the same in the hydrogen atmosphere as in the vacuum.

从材料的综合流动曲线及聚合物、粘结剂的流动性能，分析了金属注射成形喂料的流动行为，给出了用毛细管粘度计测量金属注射成形喂料粘度并确定其流动曲线参数的分析方法。

采用分步快速脱脂曲线，PW-EVA-HDPE粘结剂有序地分为三步脱除，首先是熔点最低的Pw在350℃脱除，然后升温至420℃脱除EVA，最后在500℃脱除HDPE。PW-EVA-HDPE多组元粘结剂热脱脂主要分为初期孔隙通道形成期、孔隙通道形成后剩余PW脱除期及后期剩余EVA和HDPE脱除期。其中孔隙通道形成期和连通孔隙通道形成后剩余PW脱除期的动力学控制因素为液相扩散，即Pw的热分解气体Vpw在聚合物熔体中的扩散。

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。