抄録
In measuring the oxidation rate, a temperature change of specimens could be observed when a reactive gas was introduced into a system which was sealed in vacuum. A quantitative measurement was made of the temperature change, and its effect on the oxidation rate was investigated. The temperature of the specimens changed in the following ways.
(1) When the gas was introduced, the original temperature of the specimens increased (or decreased) initially, and then reached a constant value after a certain time.
(2) When the gas was introduced, the original temperature of the specimens increased (or decreased) initially and reached a maximum (or minimum) value at a certain time, Then the temperature began to decrease (or increase) and finally recovered approximately the original temperature. These temperature changes depended largely on geometrical arrangements of the reaction system, temperature measurement and control methods, and conditions for the gas introduction. The temperature change has no great effect on the oxidation rate directly, but there is a secondary effect which may have influence on the oxidation rate even if it is removed immediately. For a kinetic study of the oxidation, it is necessary, therefore, to consider the extent of the temperature change and its secondary effect.
