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Effect of Milling Time on the Rheology of Highly Loaded Aqueous‐Fused Silica Slurry
Author(s) -
Mohanta Kalyani,
Bhargava Parag
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02153.x
Subject(s) - thixotropy , silanol , slurry , rheology , materials science , shear thinning , aqueous solution , chemical engineering , viscosity , surface charge , apparent viscosity , composite material , chemistry , organic chemistry , engineering , catalysis
The effects of milling time on the rheological behavior of 70‐vol% loaded fused silica slurries were studied. A transition from shear thickening to shear thinning behavior was observed with milling time. Slurry viscosity and thixotropy attained a minimum after 18 h of milling and remained almost unchanged with additional milling. Infrared spectroscopy and particle surface charge measurements confirmed the development of increasing amount of surface hydroxide and surface charge respectively with progress in milling time, leading to shear thinning behavior. An initial static aging treatment of 24 h aided the development of silanol groups, indicating that the milling time can be reduced to save energy and time.