急冷型水熱合成装置のデザイン及びキャリブレイション

概要

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A rapid quench hydrothermal apparatus with a large volume has been newly designed. The apparatus has advantages in quenching the sample and in having a large sample space with small temperature differences. To determine the optimum operation conditions, the temperature gradients inside the vessel were measured at the water pressure of 100 MPa, the temperatures of 300°, 500° and 700℃ and for the following variables : the angle of inclination of vessel, the length of vessel inserted into the furnace and the temperature gradient of the furnace. The flat temperature gradient over the range of 10 cm is successfully obtained with the temperature difference of 2℃ at the temperature of 700℃. The characteristics of the operation modes are as follows : the vessel is inclined at -10℃ for the horizontal and is inserted to the furnace with "steeper" temperature gradients. A reacted sample is quenched within only I minute when the vessel is removed from the furnace. The apparatus and its operations described offer a new method for hydrothermal experiments.
社団法人日本セラミックス協会の論文
1988-11-01