Kinetics of Hydrogen Absorption for Ti33V20Cr47 Alloy Powder

摘要:

研究了温度、初始压力、粒度对Ti33V20Cr47合金吸氢动力学性能的影响。研究发现，合金的吸氢过程控速环节为三维扩散，表观活化能为25.7±0.8 kJ/mol。合金的反应速度随温度的升高而加快。由于Ti33V20Cr47合金有2个吸氢平台，在1.5 MPa 和 2.5 MPa压力下比在3.5 MPa压力下更先完成吸氢。合金反应速度随合金粒度的增大而加快。原因是合金吸氢过程为放热过程，粒度越大，吸氢产生的热量越不容易耗散，温度越高，导致吸氢越快。

Abstract:

Influences of temperature, initial pressure and particle size on the hydriding reaction kinetics of Ti33V20Cr47 alloy powder was analyzed and discussed. It is found that the rate-controlling step of the hydriding processes is hydrogen diffusion with the activation energy of 25.7±0.8 kJ/mol. The reaction rate can be accelerated with the increase of temperature. The Ti33V20Cr47 alloy can finish hydrogen absorption faster under the initial pressure 1.5 MPa and 2.5 MPa than under the initial pressure 3.5 MPa because it has two plateaus. The reaction rate can also be accelerated with the increase of particle size. The possible reason could be related to the fact that the large particle size is adverse for the dissipation of reaction heat, thus leading to the rise of the alloy temperature.