TY - GEN

T1 - Study of rheological behaviour of stainless steel feedstock taking into account the thermal effects

AU - Kukla, Christian

AU - Duretek, Ivica

AU - Schuschnigg, Stephan

AU - Gonzalez-Gutierrez, Joamin

AU - Gooneie, Ali

AU - Holzer, Clemens

PY - 2015/11/30

Y1 - 2015/11/30

N2 - Powder injection moulding (PIM) process is well established for production of small precision components with both metal and ceramic powders. In comparison to unfilled polymers, the PIMfeedstocks are highly filled multiphase systems, whose flow behaviour is very sensitive to composition of binder and powder loading. Furthermore, the rheology of highly filled multiphase systems is characterized by strain and temperature dependence and influenced by flow instabilities and yield stress. In this study, the rheological behaviour of 316L feedstocks with a polypropylene/wax binder system and different powder loadings was investigated. The experimental work was performed with a rotational and a high pressure capillary rheometer. The aim of this work was to evaluate mixing rules predicting the viscosity of the feedstock out of its composition taking into account the melt temperature rise due to dissipative heating. Hence, measured data were corrected with respect to temperature. Thus the influence of the temperature onto the viscosity and the related model was evaluated.

AB - Powder injection moulding (PIM) process is well established for production of small precision components with both metal and ceramic powders. In comparison to unfilled polymers, the PIMfeedstocks are highly filled multiphase systems, whose flow behaviour is very sensitive to composition of binder and powder loading. Furthermore, the rheology of highly filled multiphase systems is characterized by strain and temperature dependence and influenced by flow instabilities and yield stress. In this study, the rheological behaviour of 316L feedstocks with a polypropylene/wax binder system and different powder loadings was investigated. The experimental work was performed with a rotational and a high pressure capillary rheometer. The aim of this work was to evaluate mixing rules predicting the viscosity of the feedstock out of its composition taking into account the melt temperature rise due to dissipative heating. Hence, measured data were corrected with respect to temperature. Thus the influence of the temperature onto the viscosity and the related model was evaluated.

KW - Rheology

KW - powder injection moulding

KW - highly filled polymer

KW - heat dissipation

KW - modelling

UR - http://e-rheo-iba.org/Papers/IBEREO2015.pdf

M3 - Conference contribution

SP - 50

EP - 53

BT - IBEREO’15 IBERIAN RHEOLOGY CONFERENCE

A2 - Rasteiro, Maria Graca

PB - Universidad Nacional de Colombia

CY - Coimbra, Portugal

T2 - IBEREO15 - Challenges in rheology and product development

Y2 - 7 September 2015 through 9 September 2015

ER -