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利用金属氢化物热力学和动力学参数测试实验系统,通过反应速率分析方法,测定了铪在恒容系统和573～873K温度范围内氘化反应的压强-时间变化关系,计算出铪在初始压强13kPa和573K,673K,773K,873K温度下吸氘反应的速率常数分别为0.0530s-1,0.0452s-1,0.0319s-1和0.0261s-1,进而得到铪吸氘反应表观活化能为(-10.1±1.5)kJ.mol-1。与同一装置上取得的钛氘化反应结果进行了比较,说明两个反应的动力学机制不同,铪氘化反应速率主要受相变和表面过程控制。
The experimental system of thermodynamics and kinetic parameters of metal hydride was used to measure the pressure-time dependence of hafnium deuterium reaction in constant temperature system and temperature range of 573 ~ 873K by the reaction rate analysis method. The results show that the initial pressure of hafnium is 13kPa And the rate constants of deuterium absorption at 573K, 673K, 773K and 873K were 0.0530s-1, 0.0452s-1, 0.0319s-1 and 0.0261s-1 respectively, and the apparent activation energy of deuterium absorption reaction was -10.1 ± 1.5) kJ.mol-1. Compared with the results of titanium deuteration obtained on the same device, the kinetic mechanism of the two reactions is different. The reaction rate of hafnium deuteration is mainly controlled by the phase transition and the surface process.