ABSTRACT Metal injection moulding (MIM) is an established process for high volume production of complex shaped metallic parts using commercially available feedstocks. The characteristics of parts after moulding, debinding, and sintering cannot be simply predictable from raw materials because the properties get altered with the process parameters and the corresponding levels of porosity during processing steps. In this study, physical properties, microstructure, and mechanical properties of the MIM parts have been characterised to understand the evolution of strength during various steps in MIM processing. Feedstocks with different binder loading show a considerable difference in physical as well as mechanical characteristics. During sintering of parts which have solid loading of grinding sludge, simultaneous in situ reduction and densification takes place, whereas only densification occurs in carbonyl iron parts. It is, therefore, possible to make complex shaped parts of different levels of porosity from downgraded shop floor metallic waste.

中文翻译：

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MIM 和再生氧化物颗粒烧结过程中零件性能的演变

摘要 金属注射成型 (MIM) 是一种使用市售原料大批量生产复杂形状金属零件的成熟工艺。零件在成型、脱脂和烧结后的特性不能简单地从原材料预测，因为特性会随着工艺参数和加工步骤中相应的孔隙率水平而改变。在这项研究中，对 MIM 零件的物理特性、微观结构和机械性能进行了表征，以了解 MIM 加工各个步骤中强度的演变。具有不同粘合剂负载的原料在物理和机械特性上表现出相当大的差异。在烧结含有固体研磨污泥的零件时，同时进行原位还原和致密化，而仅在羰基铁部件中发生致密化。因此，可以用降级的车间金属废料制造具有不同孔隙率水平的复杂形状部件。