Open AccessThe Effect of Rheological Parameters on the Behavior of Silicon Nitride-Starch Slurry Used in Gelcasting Porous Silicon Nitride
Author(s) -
Mehran Haghshenas Gorgani,
M. Mirkazemi,
F. GolestaniFard
Publication year - 2019
Publication title -
mavādd-i pīshraftah dar muhandisī
Language(s) - English
Resource type - Journals
eISSN - 2423-5733
pISSN - 2251-600X
DOI - 10.29252/jame.37.4.13
Subject(s) - materials science , silicon nitride , slurry , rheology , composite material , porosity , starch , nitride , silicon , porous silicon , metallurgy , layer (electronics) , chemistry , biochemistry
In this research, the rheological behavior and stability of suspensions containing Si3N4, Al2O3, Y2O3 and starch were investigated in order to use them in the starch consolidation casting of porous silicon nitride. Dolapix CE64 was used as the dispersant. Then, the effect of some parameters such as Si3N4 surface oxidation, dispersant content, solid loading and starch content on the viscosity and rheological behavior of Si3N4-starch slurry was determined. Surface oxidation of Si3N4 powder at 800C for 2 hours reduced the viscosity of the slurry, effectively. The best dispersant content was 0.4 wt. %, relative to ceramic powders. Slurries containing 30 to 40 vol. % and 7.5 to 25 vol. % starch, relative to total solid loading, had the suitable viscosity and the sufficient stability for casting by the starch consolidation method.
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