Abstract
Ceramics with high strength and reliability are highly demanded in engineering applications. In this paper, a modified direct coagulation casting via high valence counter ions (DCC-HVCI) method for alumina using calcium citrate complex assisted by glycerol diacetate was investigated. Calcium citrate complex suspensions were prepared by mixing tri-ammonium citrate and calcium chloride in water. Effect of reaction time on the chelating properties of the prepared suspensions was investigated. Concentrated alumina suspensions with a solid loading of 50vol% were prepared by mixing the calcium citrate complex suspensions and alumina powder at pH of 10.5. Then the suspensions were coagulated by adding 3–6vol% glycerol diacetate at temperatures of 40–70°C for 2–6h. The compressive strength of the coagulated wet samples is in the range 1.1–2.4MPa. Alumina ceramics sintered at 1550°C shows homogeneous microstructures with flexural strength and Weibull modulus of 455±17MPa and 30, respectively.
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