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  • Laarz, E, et al. (author)
  • Aqueous silicon nitride suspensions: Effect of surface treatment on the rheological and electrokinetic properties
  • 1997
  • In: Key Engineering Materials. - 1013-9826 .- 1662-9795. ; 132-136, s. 285-288
  • Journal article (peer-reviewed)abstract
    • The effect of surface treatment on the colloidal stability and rheological properties of concentrated aqueous silicon nitride suspensions has been studied. Oxidized, leached and as-received, non-treated powders were studied using electroacoustic and rheological methods. At pH=10, the silicon nitride powder is well dispersed irrespective of surface treatment. However, the viscosity was affected by the surface treatment; oxidation caused a slightly higher and leaching a significantly lower viscosity. Several possible causes of the leaching effect on viscosity was discussed, e.g. leaching causing a smooth particle surface or facilitating break-up of strong, liquid immobilizing agglomerates. Additionally, the effect of added dispersants – anionic small molecules and polyelectrolytes – were also briefly mentioned.
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