備前土の焼結の研究(第２報)

概要

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Three kinds of soils used for the bizen ware were ignited at every 100C interval of rising temperature up to 1000C in N2 atmosphere, and successively each of the soils thus treated was imposed to measurement of the surface area. It was found that the soil, Kurotsuchi, showed the largest decrease in surface area among them, corresponding to the occurrence of remarkable sintering. Choosing the Kurotsuchi as a sample suitable for inspecting the sintering effect, the present authors ignited it at four temperatures from 750 to 820c for various periods. As a result, (1)the higher the ignition temperature was, the moresteadily the decrease in surface area occurred. (2)At 750C, differently from the cases at other temperatures, the surface area increased strangely in the initial stage of the ignition, began to decrease by way of the maximum, returned to the initial value, and then decreased gradually in the same way as other cases above 780C. (3)Every declining curve of the surface area except 750C's can be fitted to the equation of the first order reaction. (4)Above 780C, the sintering process seems to be composed of the two mechanisms. The activaton energy for the first mechanism can be estimated to be 413kJ/mol. Based on this value, the sintering process in Kurotsuchi is discussed briefly.