Wall slip of highly filled powder injection moulding compounds in dependence on capillary die geometry

0507469 - ÚH 2020 RIV US eng C - Conference Paper (international conference)
Filip, Petr - Hausnerová, B. - Sanétrník, D. - Hnátková, E.
Wall slip of highly filled powder injection moulding compounds in dependence on capillary die geometry.
AIP Conference Proceedings. Volume 2107, Issue 1. Melville: American Institute of Physics, 2019 - (Zatloukal, M.; Musil, J.), č. článku 030005. ISBN 978-0-7354-1839-4. ISSN 0094-243X.
[International Conference on Novel Trends in Rheology /8./. Zlín (CZ), 21.05.2019]
R&D Projects: GA ČR GA17-26808S
Institutional support: RVO:67985874
Keywords : Powder Injection Moulding * wall slip * capillary die geometry
OECD category: Fluids and plasma physics (including surface physics)

The feedstocks used in Powder Injection Moulding (PIM) are formed by solid particles incorporated into a binder with presence of surfactant enabling manufacturing of highly concentrated suspensions. Relatively even distribution of particles is violated in the close vicinity of the walls. A thin layer adjacent to the walls is pre-dominantly occupied by the binder only and at the interface wall-binder so-called wall slip occurs. Success and acceptance of an injection moulding step in PIM process primarily subjects to this wall slip phenomenon. The wall slip was qualitatively and quantitatively measured using a capillary rheometer equipped with the dies of different entrance angles. It was proved that this differentness has a significant impact on an appearance of wall slip (its intensity). Using four PIM feedstocks reliable slip velocity values of highly filled compounds were obtained for conical dies contrasting to the results with flat dies used in the majority of studies.
Permanent Link: http://hdl.handle.net/11104/0298464