CaO・2Al_2O_3の初期水和過程

概要

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The early stage of hydration of Ca0・2Al_20_3 was investigated. Hydration was carried out mainly in a diluted water suspension. The rate of hydration of ・CaO2Al_2O_3 was greatly affected by the water/ solid ratio and the synthetic condition of specimen, while the mechanism of hydration remained unchanged under these conditions. In particular, formation of crystalline hydrates was retarded with increasing water/ solid ratio. At the earliest period of hydration, the reaction rate was slow and hydrates were not found. It appears that this period corresponds to a nucleation stage of gibbsites. In the following period precipitation of gibbsite was observed, in which the concentrations of CaO and Al_20_3 in the liquid increased rapidly, accompanied by an increase in CaO/Al_20_3 molar ratio. In this period the reaction proceed by the dissolution- crystallization mechanism. Finally, different hydrates such as 2・AlCaO_20_3・8H_20 began to precipitate and the rate of hydration was accelerated.
社団法人日本セラミックス協会の論文
1988-01-01