Effects of Sintering Temperature on Phase, Physical Properties and Microstructure of Ca₃Co₄O₉ Ceramic

Abstract:

This study investigated the effects of sintering temperature on phase, physical properties and microstructure of calcium cobalt oxide (Ca₃Co₄O₉ or CCO) ceramic. CCO powder was prepared with using the mixed oxide method and calcined at 750°C for 24 h. The ceramics were prepared by sintering the powder at 900, 950, 1000 and 1050°C under a normal air atmosphere for 24 h. A maximum density of 4.02 g/cm³ (~92% relative density) with 12% linear shrinkage was obtained in the sample sintered at 1000°C. XRD patterns of the CCO ceramics indicated pure phase with no detected impurity. SEM images of the ceramics showed plate-like shaped grains. The average grain size value gradually increased as the sintering temperature increased, and reached a maximum value of 8.95 mm at the sintering temperature of 1000°C. The deviation from stoichiometric composition for the samples sintered at low sintering temperatures may be due to the low sample density which in turn affected the EDS analysis results.

• Periodical: Solid State Phenomena (Volume 283)
• Pages: 101-106
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.283.101
• Online since: September 2018
• Authors: Pimpilai Wannasut, Poom Prayoonphokkharat, Nittaya Keawprak, Panupong Jaiban, Anucha Watcharapasorn*
• Keywords: Calcium Cobalt Oxide, Ceramic, Solid State Sintering

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