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Online rheometry investigation of flow/slip behavior of powder injection molding feedstocks

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dc.title Online rheometry investigation of flow/slip behavior of powder injection molding feedstocks en
dc.contributor.author Sanétrník, Daniel
dc.contributor.author Hausnerová, Berenika
dc.contributor.author Pata, Vladimir
dc.relation.ispartof Polymers
dc.identifier.issn 2073-4360 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2019
utb.relation.volume 11
utb.relation.issue 3
dc.type article
dc.language.iso en
dc.publisher MDPI AG
dc.identifier.doi 10.3390/polym11030432
dc.relation.uri https://www.mdpi.com/2073-4360/11/3/432
dc.subject powder injection molding en
dc.subject feedstock en
dc.subject online rheometer en
dc.subject wall slip en
dc.subject slit die en
dc.subject surface roughness en
dc.description.abstract Wall slip in the flow of powder injection molding (PIM) compounds can be the cause of unrealistically low viscosity values, and can lead to a failure of flow simulation approaches. Regardless of its importance, it has been considered only scarcely in the rheological models applied to PIM materials. In this paper, an online extrusion rheometer equipped with rectangular slit dies was used to evaluate the slip velocity of commercial as well as in-house-prepared PIM feedstocks based on metallic and ceramic powders at close-to-processing conditions. The tested slit dies varied in their dimensions and surface roughness. The wall-slip effect was quantified using the Mooney analysis of slip velocities. The smaller gap height (1 mm) supported the wall-slip effect. It was shown that both the binder composition and the powder characteristic affect slip velocity. Slip velocity can be reduced by tailoring a powder particle size distribution towards smaller particle fractions. The thickness of the polymer layer formed at the channel wall is higher for water-soluble feedstocks, while in the case of the catalytic polyacetal feedstocks the effect of surface roughness was manifested through lower viscosity at smooth surfaces. © 2019 by the authors. en
utb.faculty Faculty of Technology
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1008609
utb.identifier.obdid 43880445
utb.identifier.scopus 2-s2.0-85063393547
utb.identifier.wok 000465602800007
utb.identifier.pubmed 30960416
utb.source j-scopus
dc.date.accessioned 2019-07-08T11:59:58Z
dc.date.available 2019-07-08T11:59:58Z
dc.description.sponsorship Ministry of Education, Youth, and Sports of the Czech Republic-Program NPU I [LO1504]
dc.rights Attribution 4.0 International
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.access openAccess
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Sanétrník, Daniel
utb.contributor.internalauthor Hausnerová, Berenika
utb.contributor.internalauthor Pata, Vladimir
utb.wos.affiliation [Sanetrnik, Daniel; Hausnerova, Berenika; Pata, Vladimir] Tomas Bata Univ, Fac Technol, Dept Prod Engn, Nam TG Masaryka 5555, Zlin 76001, Czech Republic; [Sanetrnik, Daniel; Hausnerova, Berenika] Tomas Bata Univ, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic
utb.scopus.affiliation Dept. of Production Engineering, Faculty of Technology, Tomas Bata University in Zlin, Nám. T. G. Masaryka 5555, Zlín, 760 01, Czech Republic; Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida T. Bati 5678, Zlín, 760 01, Czech Republic
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