摘要
应用特制双层水恒温反应器和动力学机理函数计算机拟合的方法，在３０３—３４３Ｋ温度范围内研究了ＭＬ—Ｎｉ—Ｃｏ—Ｍｎ—Ａｌ五元系和ＭＬ—Ｎｉ—Ｃｏ—Ｍｎ—Ａｌ—Ｃｕ六元系（ＭＬ为富镧混合稀土金属）在α＋β相区恒温吸氢动力学．研究结果表明，五元系贮氢合金吸氢初期受化学反应控速，后期受氢在合金氢化物中的扩散控速，动力学规律不受氢初压的影响．由于Ｃｕ的加入，六元系贮氢合金吸氢机制初期转变为β相形核长大控速，后期仍为氢在合金氢化物中的扩散控速．
Hydrogenation kinetics of ML-Ni-Co-Mn-Al and ML-Ni-Co-Mn-Al-Cu alloys in α+β phase region at the temperature range of 303-343 K has been studied.The kinetic mechanism of hydrogen absorption is not affected by initial hydrogen pressure.Temperature does not influnce the rate of hydrogen absooption obviously. In the prior and later period of hydrogen absorption the rate-controlling steps are the chemical reaction and the hydrogen diffusion in the hydride phase in ML-Ni-Co-Mn-Al alloy respectively. Adding Cu, the mechanism of hydrogen absorption changes from chemical reaction to the nucleation and growth of β-phase in the prior period, and the process of hydrogen absorption is still controlled by the diffusion in the later period.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第6期624-628,共5页
Acta Metallurgica Sinica
关键词
贮氢合金
α+β相区
吸氢动力学
hydrogen storage alloy,(α+β)-phase, hydrogenation kinetics
