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Rheological properties of concentrated, nonaqueous silicon nitride suspensions
YKI – Ytkemiska institutet.
1996 (engelsk)Inngår i: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 79, s. 3033-3040Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]

The rheological properties of nonaqueous silicon nitride powder suspensions have been investigated using steady shear and viscoelastic measurements. The polymeric dispersant, Hypermer KD-3 adsorbed strongly on the powder surfaces and colloidally stable, fluid suspensions up to a volume fraction of Φ= 0.50 could be prepared. The concentrated suspensions all displayed a shear thinning behavior which could be modelled using the high shear form of the Cross equation. The viscoelastic response at high concentrations was dominated by particle interactions, probably due to interpenetration of the adsorbed polymer layers, and a thickness of the adsorbed Hypermer KD-3 layer, ∆≈10 nm, was estimated. The volume fraction dependence of the high shear viscosity of three different silicon nitride powders were compared and the differences, analysed by using a modified Krieger-Dougherty model, were related to effective volume effects and the physical characteristics of the powders. The significantly lower maximum volume fraction, Φm= 0.47, of the SN E-10 powder was referred to the narrow particle size distribution and the possibility of an unfavourable particle morphology.

sted, utgiver, år, opplag, sider
1996. Vol. 79, s. 3033-3040
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-26622OAI: oai:DiVA.org:ri-26622DiVA, id: diva2:1053625
Merknad
A1044Tilgjengelig fra: 2016-12-08 Laget: 2016-12-08 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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