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Friction and adhesion of single spray-dried granules containing a hygroscopic polymeric binder
YKI – Ytkemiska institutet. Stockholms Universitet.
Stockholms Universitet.
2005 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 155, 101-107 p.Article in journal (Refereed)
Abstract [en]

The atomic force microscope has been used to study the friction and adhesion of single spray dried granules containing a mixture of fine tungsten carbide and cobalt powders and various amounts of a polymeric binder, polyethylene glycol (PEG). The adhesion or the pull-off force and the friction force between two single granules (representing intergranular friction) and between a granule and a hard metal substrate (representing die-wall friction) have been determined as a function of relative humidity. We found that the granule-wall friction increases with binder content and relative humidity. The small friction force at the lowest addition of PEG was related to a small contact area due to the high surface roughness of the granules. The substantial increase in the friction coefficient at PEG-addition>1wt% was related to the plasticity of the binder-rich granule surface where an increase in binder content or relative humidity increases the deformability. The granule-granule friction and adhesion is independent of the relative humidity and substantially lower than the granule-wall friction at all PEG contents, which has important implications for the handling of granular matter

Place, publisher, year, edition, pages
2005. Vol. 155, 101-107 p.
Keyword [en]
Friction, granule, PEG, hard metal, pressing, AFM
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27395OAI: oai:DiVA.org:ri-27395DiVA: diva2:1054399
Note
A1672Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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