Rheology of aqueous silicon nitride suspensions

✍ Scribed by Alwin Nagel; Günter Petzow; Peter Greil

• Book ID: 103973550
• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 732 KB
• Volume: 5
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(89)90041-1

✦ Synopsis

Highly concentrated silicon nitride slips with solidvolume concentrations gp o['up to 0"475 were prepared Ji'om preoxidized, submicron powders in aqueous solutions at pH > 8. Viscosi O, measurements reveal a pseudo-plastic l?ow hehaviour at dp > 0.35, which could not he described b.!' existing.[low equations. On the basis ~71 the elasticzfloc model for highly concentrated suspensions, a modified flow equation was derived, which is only determined by the initial floc-volume ratio and the particle-packing densiO,. The calculated viscosity .[its ve O, well with the experimental values /~ore low to high particle-volume concentrations dp [i'om 0"2 to 0"475.