Effects of milling and active surfactants on rheological behavior of powder injection molding feedstock

来源期刊：中国有色金属学报(英文版)2001年第2期

论文作者：范景莲 黄伯云 曲选辉

文章页码：196 - 199

Key words：milling; active surfactant; rheological behavior

Abstract: The effects of milling and active surfactants on the rheological behavior of powder injection molding feedstock were discussed. The feedstock consists of traditional compositional 90W-7Ni-3Fe powder mixture and a wax based polymer binder. Before mixing feedstock, the powder mixture was milled for different times in a QM-1 high-energy ball mill. The viscosity of the feedstock was examined in a capillary rheometer. The rheological behavior was evaluated from viscosity data. The results show that the feedstock belongs to a pseudoplastic fluid, milling decreases viscosity of the feedstock and the sensitivity of viscosity to shear strain rate. The flowability, rheology and powder loading of this feedstock are improved by milling. Active surfactants such as stearic acid (SA) and di-n-octyl-o-phthalate (DOP) have great influences on the rheological properties of the feedstock. DOP improves the flowability and rheological stability of the feedstock further.