A description of shear viscosity for highly filled PIM material containing aluminium powder and stearic acid

0504059 - ÚH 2020 RIV SI eng A - Abstrakt
Filip, Petr - Hausnerová, B.
A description of shear viscosity for highly filled PIM material containing aluminium powder and stearic acid.
AERC 2019. 13th Annual European Rheology Conference. Book of Abstracts.. Portorož: European Society of Rheology, 2019. s. 48.
[Annual European Rheology Conference AERC /13./. 08.04.2019-11.04.2019, Portorož]
Grant CEP: GA ČR GA17-26808S
Grant ostatní: Ministerstvo školství, mládeže a tělovýchovy (MŠMT)(CZ) LO1504
Institucionální podpora: RVO:67985874
Klíčová slova: shear viscosity * Powder Injection Moulding (PIM) * nanoparticles
Obor OECD: Fluids and plasma physics (including surface physics)

Powder Injection Moulding (PIM) method represents a processing technique enabling production of very tiny geometrically complicated metal and ceramic parts integrated in one piece, thus eliminating a necessity of assembling geometrically simpler parts in one aggregate. Feedstock forming a starting material is composed of two entry components: metal or ceramic powder (including nanoparticles) and a carrier liquid, so called binder. This highly filled suspension (metal portion reaches 50-60 vol. %) is rather complicated material to be described both experimentally and theoretically. Even so relatively elementary rheological characteristic as shear viscosity is uneasy to predict. The theoretical and empirical predictions of this quantity are well elaborated for dilute and moderately concentrated suspension. However, with an increasing concentration availability of suitable models substantially reduces and the predicted evaluation (constitutive models) of shear viscosity depends exclusively on the only component - particle concentration. In practice, the suspensions used in the PIM method are not composed from only two components but presence of other materials -as e.g. surfactants contributing to higher packing, and hence, to better sintering- is also inevitable. The problem is how to model shear viscosity taking into account simultaneously metal particles and efficient agents. As far the authors are aware no such models exist. For the case of aluminium powder and stearic acid (surfactant) there was proposed a master curve approximating shear viscosity in the range 0 - 50 vol. % for powder and 0 - 5 vol. % for stearic acid. A deviation of the predicted shear viscosity from the experimental one is within the experimental error.
Trvalý link: http://hdl.handle.net/11104/0295768