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。

Four kinds of Fe-2Ni metal injection moulding (MIM) feedstocks with the same powder loading and with similar binder composition except for minor components were prepared and their viscosities at different temperatures and shear rates determined using a capillary rheometer. The flowabilitv and the sensitivity of viscosity to shear rate and temperature were investigated. The viscosities of the binders and the general theological indices of feedstocks were compared. The results show that the minor com- ponents of the binders play a very important role in the rheology of feedstocks. A feedstock based on a PW PP binder can not be used for injection mould-ing owing to severe powder binder separation. A feed-stock based on a PW EVA binder has the lowest viscosity and is the easiest to flow into the mould. The viscosity of a feedstock based on a PW EVA HDPE binder is higher than that of a feedstock based on the PW EVA binder and is lower than that of a feedstock based on a PW HDPE binder. The general rheolog-ical index, which includes the effect of flowabilitv and the sensitivity of viscosity to shear rate and temper-ature, can be used to evaluate the general theological properties of MIM feedstocks. At a reference temper-ature of 150℃ and reference shear rate of 1181 s-1. the general rheological indices for the feedstocks based on the PW-EVA. PW-HDPE, and PW-EVA-HDPE binders are 7-8. 4-0. and 93 respectively. The feedstock based on the PW EVA HDPE binder has the best general rheological properties and is most suitable for injection moulding. The mechanical prop-erties and shrinkage homogeneity of MIM tensile bars prepared with the feedstock based on the PW EVA HDPE binder are also the most acceptable.

以单聚合物组元石蜡基粘结剂PW-EVA和PW-HDPE作为对比，选择具有良好喂料流变学性能的PW-EVA-HDPE多聚合物组元石蜡基粘结剂，研究其脱脂保形性和分步快速脱脂过程。研究结果表明：采用分步快速脱脂曲线，PW-EVA-HDPE 粘结剂中的PW、EVA、HDPE 可分别在350℃、420℃、500℃有序地分为3步依次脱除，该粘结剂体系具有最佳的脱脂保形性能。

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。