纳米Mg—Ni合金吸／放氢过程的热力学性能研究

The Investigation of Thermodynamic Properties of Nanocrystalline Mg-Ni Alloy during Hydrogen Absorption and Desorption

摘要:

采用机械合金化法制备了Mg-Ni合金粉末。用XRD及SEM等手段分析表征了球磨过程中的相和微观结构变化，测定了纳米Mg-Ni合金吸／放氢过程的热力学性能。结果表明，Mg-Ni合金粉末的尺寸在10nm-20nm之间；P-C等温线存在明显的坪曲线，坪宽较长。纳米Mg-Ni合金有较好的储氢性能，具有很好的工程应用价值。

Abstract:

The Mg-Ni alloy was prepared by mechanical alloying. XRD and TEM analysis were used to indentify the microstructure and the phase of the Mg-Ni composite during the milling process, the thermodynamic properties of nanocrystalline Mg-Ni alloy were measured The results show that the alloy powder can be prepared by mechanical alloying on the condition that the milling technological parameters were strictly controled, The particle sizes of the powder were between 10 nm and 20 nm. At P-C isotherms there existed good plateau curves with long-width plateau.The nanocrystalline Mg-Ni alloy had a hystersis effect during hydrogen absorption/desorption and the effect decreased with the increase of temperature. The nanocrystalline Mg-Ni alloy has satisfied properties of hydrogen storage and a promising value of engineering application.