Influence of visco-elastic binder properties on ram extrusion of a hardmetal paste

Autor:	S.L. Rough, D.I. Wilson, R. Barbist, H. Ferstl
Rok vydání:	2012
Předmět:	Materials science Mechanical Engineering Rheometer Slip (materials science) Viscous liquid Viscoelasticity Physics::Fluid Dynamics Viscosity Mechanics of Materials Solid mechanics Computer Science::Programming Languages General Materials Science Extrusion Composite material Elastic modulus
Zdroj:	Journal of Materials Science. 47:6835-6848
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-012-6627-4
Popis:	The influence of the viscous and elastic components of a visco-elastic binder phase on the extrusion behaviour of a tungsten carbide–cobalt hardmetal paste was investigated by studying the paste over a range of temperatures, 30–42 °C, where the binder changed from a semi-solid gel to a viscous liquid. The extrusion behaviour of the paste was studied by ram extrusion and quantified by the Benbow–Bridgwater (BB) method. The elastic and viscous components of the binder were studied separately by means of oscillatory and steady shear techniques in a controlled stress rheometer using rough parallel plates. The paste behaviour fitted the four parameter BB model well: the initial bulk yield stress parameter, σ0, increased linearly with the binder elastic modulus, G′, while both the velocity dependence parameters α and β were linearly related to the binder steady shear viscosity. Analysis of paste-wall slip parameters gave estimated slip layer thicknesses of 2–5 particle diameters.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ace2c6e0ee876d1fb32edd27295c3ed8 https://doi.org/10.1007/s10853-012-6627-4 Zobrazit plný text záznamu Plný text ve formátu PDF