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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 2    April 2001

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Effects of milling and active surfactants on
rheological behavior of powder injection molding feedstock
FAN Jing-lian(范景莲), HUANG Bai-yun(黄伯云), QU Xuan-hui(曲选辉)

State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, P.R.China

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.

 

Key words: milling; active surfactant; rheological behavior

ISSN 1672-7029
CN 43-1423/U

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