论文部分内容阅读
研究Ti40合金在550～700°C温度区间的吸氢动力学,初始氢压为15.88～45.88kPa。研究表明,Ti40合金初始吸氢温度为515°C,吸氢时达到平衡所需的时间随着温度和初始氢压的增加而缩短,而吸氢速率和平衡氢压随着温度和初始氢压的增加而增加。在低温时,吸氢过程包括3个阶段:Ⅰ孕育期,Ⅱ第1吸氢阶段和Ⅲ第2吸氢阶段。在相同温度下,不同阶段的速率常数遵循以下关系:kⅡ>kⅠ>kⅢ。在相同阶段,速率常数随温度的升高而增大。吸氢过程中第1和第2吸氢阶段的激活能分别为73.3和29.6kJ/mol。第2吸氢阶段的速率控制步骤为氢在β-Ti中的扩散。
The hydrogen absorption kinetics of Ti40 alloy at 550-700 ° C was investigated. The initial hydrogen pressure was 15.88-45.88 kPa. The results show that the initial hydrogen absorption temperature of Ti40 alloy is 515 ° C, and the time required to reach equilibrium for hydrogen absorption shortens with the increase of temperature and initial hydrogen pressure, while the hydrogen absorption rate and equilibrium hydrogen pressure decrease with the increase of temperature and initial hydrogen pressure Increase and increase. At low temperature, the hydrogen absorption process consists of three stages: Ⅰ incubation period, Ⅱ first hydrogen absorption stage and Ⅲ second hydrogen absorption stage. At the same temperature, the rate constants at different stages follow the following relationship: kII> kI> kIII. In the same stage, the rate constant increases with increasing temperature. The activation energies of the first and second hydrogen absorption stages during hydrogen absorption were 73.3 and 29.6 kJ / mol, respectively. The rate-controlling step in the second hydrogen-absorbing stage is the diffusion of hydrogen in β-Ti.