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J Mater Sci Technol  2004, Vol. 20 Issue (04): 435-438    DOI:
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Processing and Sintering of Agglomerate-free CaO-ZrO2 Powder
Liping LIANG, Shue DANG , Dong WU, Yuhan SUN
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
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Abstract  Coprecipitation supercritical fluid drying technology has been employed to synthesize calcia-stabilized zirconia ultrafine powder with low-cost inorganic salts as the starting materials. The sintering behaviors of these powders were also investigated. The results showed that supercritical fluid drying could effectively alleviate the hard agglomeration of grains during the gel drying process, and the morphology of the powder retained the network texture of the original gel. The resulting particles were characterized by small particle size (5~20 nm), better monodispersity and high surface area, which gave rise to high activity and sinterability. Consequently, these powders could readily be compacted into the desired shape and their densification could be carried out in shorter time and at lower temperatures. For instance, nanometer-sized powder calcined at 600ºC for 2 h could be cold-pressed into a green body and sintered at 1100º for 0.5 h to attain a dense body with bulk density of 5.9718 g/cm3 and specific pore volume of 0.0008 cm3/g.
Key words:  Calcia-stabilized zircornia      Ultrafine powder      Supercritical fluid drying      Sintering      
Received:  01 January 1900     
Corresponding Authors:  Yuhan SUN     E-mail:  yhsun@sxicc.a.cn

Cite this article: 

Liping LIANG, Shue DANG, Dong WU, Yuhan SUN. Processing and Sintering of Agglomerate-free CaO-ZrO2 Powder. J Mater Sci Technol, 2004, 20(04): 435-438.

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