Mathematical model of metal-hydride phase change applied to Yttrium

15th Russian Youth Conference on Physics and Astronomy

物理学;天文学

Chernov, I.A.^1 ; Manicheva, S.V.^2 ; Gabis, I.E.^3

Institute of Applied Mathematical Research, Karelian Research Centre, RAS, Pushkinskaya 11, 185910 Petrozavodsk, Russia^1

Karelian State Pedagogical Academy, Pushkinskaya 17, 185035 Petrozavodsk, Russia^2

Phys. Dep. of St-Petersburg State University, St-Petersburg, Russia^3

关键词: Concurrent process;    Different shapes;    Experimental curves;    Long thin cylinders;    Mass conservation law;    Metal hydrides;    Model equations;    Powder particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/461/1/012042/pdf
DOI  :  10.1088/1742-6596/461/1/012042

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We present a mathematical model for the kinetics of hydriding and dehydriding of metal powders. The single powder particle is considered. Its shape is approximated by one of the symmetric ones: sphere, long thin cylinder (wire), or flat thin plate. A few concurrent processes are considered. The model equations are derived from the mass conservation law. We consider the case of the "shrinking core" morphology, i.e. formation of the hydride skin on the surface of the particle with subsequent growth of this skin. We consider three successive stages of the phase change: skin development, skin growth, and final saturation or degassing. We apply the model to experimental data for Yttrium and show that the approximation of the experimental curves by the model ones is comparable for different cycles and different shapes for similar sets of the kinetic parameters. This also shows that shape of powder particles do not influence significantly on the kinetics of hydriding and dehydriding.