Chou模型在La(Fe,Si)13基磁性材料中的研究应用  

Research on Applications of Chou Model in La(Fe,Si)13-Base Magnetic Materials

作　　者：刘永瑞 赵金良[1] 焦宇佳 Liu Yongrui;Zhao Jinliang;Jiao Yujia(College of Applied Sciences,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学应用数理学院,北京100124

出　　处：《稀有金属材料与工程》2020年第12期4166-4171,共6页Rare Metal Materials and Engineering

摘　　要：介绍了合金材料吸氢的基本原理及反应机理,主要利用稀土系储氢材料的吸氢模型方程研究了磁性制冷材料La(Fe,Si)13基合金的吸氢特性。通过Chou模型建立了La0.7Pr0.3Fe11.5Si1.5和La0.7Pr0.3Fe11.5Si1.5C0.2合金的吸氢反应分数与时间、温度的具体关系式,探究了2种合金材料的吸氢反应特性。根据模型方程,引入吸氢过程中的重要参数"特征反应时间",得到在等温等压条件下的La0.7Pr0.3Fe11.5Si1.5和La0.7Pr0.3Fe11.5Si1.5C0.2合金的吸氢反应分数随时间的变化曲线。由模型方程还得到这2种合金吸氢反应分数与温度的关系曲线,曲线表明2种合金均表现出温度越高,特征反应时间越短,合金的吸氢速率越快的特点,与实验得到的结果一致。A new model,Chou model,for predicting the fraction of hydriding reaction in La(Fe,Si)13 compounds was studied.This model is simple and practical,which offers the fraction of hydrogen absorption as a function of time and temperature explicitly.T he basic principle and reaction mechanism of hydrogen absorption of alloy materials are briefly introduced.Besides,the"characteristic absorption time"as a new concept has been introduced,which directly reflects the hydrogen absorption rate of the alloy.The shorter the characteristic absorption time is,the faster the hydrogen absorption rate is.Chou model quantitatively explores the hydrogen-absorbing reaction characteristics of La0.7Pr0.3Fe11.5Si1.5and La0.7Pr0.3Fe11.5Si1.5C0.2 alloys.At the same time,the change of temperature also affects the hydrogen absorption characteristics of the alloys.The relationship between the fraction of hydrogen absorption and the temperature is obtained by the model equation,indicating that the higher the temperature,the shorter the characteristic absorption time,and the faster the hydrogen absorption rate of the alloys,which is consistent with the experimental results.

关 键 词：La(Fe Si)13基合金 磁热效应 吸氢动力学模型方程 特征反应时间 

分 类 号：TG111.92[金属学及工艺—物理冶金]