Effect of Concentration of Ammonium Poly(acrylate) Dispersant and MgO on Coagulation Characteristics of Aqueous Alumina Direct Coagulation Casting Slurries

Coagulation of aqueous alumina slurries prepared using various concentrations (0.43–1.04 wt% based on alumina) of ammonium poly(acrylate) dispersant by MgO has been studied for direct coagulation casting (DCC) of alumina. The slurries prepared at dispersant concentration below 0.84 wt% are not suita...

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Veröffentlicht in:Journal of the American Ceramic Society 2008-06, Vol.91 (6), p.1933-1938
Hauptverfasser: Prabhakaran, Kuttan, Kumbhar, Chandrashekhar S., Raghunath, Sooraj, Gokhale, Nitin Madusudhan, Sharma, Suresh Chandra
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container_end_page 1938
container_issue 6
container_start_page 1933
container_title Journal of the American Ceramic Society
container_volume 91
creator Prabhakaran, Kuttan
Kumbhar, Chandrashekhar S.
Raghunath, Sooraj
Gokhale, Nitin Madusudhan
Sharma, Suresh Chandra
description Coagulation of aqueous alumina slurries prepared using various concentrations (0.43–1.04 wt% based on alumina) of ammonium poly(acrylate) dispersant by MgO has been studied for direct coagulation casting (DCC) of alumina. The slurries prepared at dispersant concentration below 0.84 wt% are not suitable for DCC at room temperature (∼30°C) as they undergo premature coagulation. Mixing the slurry with MgO at a low temperature of nearly 5°C slows down the reactions leading to coagulation and keeps the slurry viscosity low for a sufficient period of time. Coagulation of slurries prepared at a dispersant concentration of 0.92 wt% and above at room temperature requires MgO concentrations much higher than the equivalent amount required for reaction with the dispersant. This anomalous behavior at higher dispersant concentration is explained such that the Mg‐poly(acrylate) formed by the reaction between ammonium poly(acrylate) and MgO formed a sheath over the remaining MgO particles and prevented them from further dissolution at room temperature. Faster coagulation could be achieved by heating the slurries after casting in closed molds. The Mg‐poly(acrylate) acts as a binder and stabilizes the coagulated bodies as their strength and stability against oscillatory stresses increase with an increase in dispersant concentration.
doi_str_mv 10.1111/j.1551-2916.2008.02395.x
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The slurries prepared at dispersant concentration below 0.84 wt% are not suitable for DCC at room temperature (∼30°C) as they undergo premature coagulation. Mixing the slurry with MgO at a low temperature of nearly 5°C slows down the reactions leading to coagulation and keeps the slurry viscosity low for a sufficient period of time. Coagulation of slurries prepared at a dispersant concentration of 0.92 wt% and above at room temperature requires MgO concentrations much higher than the equivalent amount required for reaction with the dispersant. This anomalous behavior at higher dispersant concentration is explained such that the Mg‐poly(acrylate) formed by the reaction between ammonium poly(acrylate) and MgO formed a sheath over the remaining MgO particles and prevented them from further dissolution at room temperature. Faster coagulation could be achieved by heating the slurries after casting in closed molds. 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identifier ISSN: 0002-7820
ispartof Journal of the American Ceramic Society, 2008-06, Vol.91 (6), p.1933-1938
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subjects Alumina
Aluminum oxide
Applied sciences
Aqueous chemistry
Binders
Building materials. Ceramics. Glasses
Casting
Ceramic industries
Ceramics
Chemical industry and chemicals
Chemistry
Coagulation
Colloidal state and disperse state
Dispersants
Emulsions and suspensions
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
Heat treating
Heating
Magnesium
Magnesium oxide
Miscellaneous
Slurries
Studies
Technical ceramics
Temperature effects
title Effect of Concentration of Ammonium Poly(acrylate) Dispersant and MgO on Coagulation Characteristics of Aqueous Alumina Direct Coagulation Casting Slurries
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