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采用放电等离子烧结(SPS)工艺制备了Mg2-xNdxNi(x=0,0.1,0.2,0.3)储氢合金.通过X射线衍射(XRD)和扫描电镜(SEM)研究了合金的相结构和表面形貌,利用等容压差法分析测试了合金的压力--组成--温度(PCT)曲线和吸放氢动力学性能,研究了烧结温度、稀土元素Nd对储氢合金微观组织结构和储氢性能的影响,比较了SPS技术与真空感应熔炼法制备的Mg基合金组织结构和储氢性能的异同.结果表明:SPS制备的Mg2-xNdxNi(x=0～0.3)系列储氢合金具有多相结构,储氢合金的吸放氢动力学性能良好;Nd元素有利于Mg合金化,不利于储氢量;烧结温度对储氢量、PCT曲线平台性能有明显影响;当Mg2-xNdxNi系合金中含有Mg和NdMg12相,PCT曲线出现双平台现象;与铸态合金相比,SPS制备的Mg1.7Nd0.3Ni储氢合金的吸放氢动力学性能较好,但储氢容量、放氢率和PCT曲线平台性能更差.
The hydrogen storage alloys Mg2-xNdxNi (x = 0,0.1,0.2,0.3) were prepared by spark plasma sintering (SPS). The phase structure and surface morphology of the alloys were investigated by X-ray diffraction and scanning electron microscopy The pressure-composition-temperature (PCT) curve and the kinetics of hydrogen absorption and desorption were analyzed by isovolumetric pressure difference method. The effects of sintering temperature, rare earth element Nd on the microstructure of hydrogen storage alloy and hydrogen storage The results show that the Mg2-xNdxNi (x = 0 ~ 0.3) series hydrogen storage alloys prepared by SPS have the characteristics of multi-phase Structure and hydrogen storage alloy hydrogen absorption and desorption of hydrogen kinetics good; Nd element is conducive to Mg alloy, is not conducive to the amount of hydrogen storage; sintering temperature on the hydrogen storage capacity, PCT curve platform performance significantly; when Mg2-xNdxNi series of alloys Containing Mg and NdMg12 phase, the PCT curve appears dual platform phenomenon; Compared with as-cast alloy, the hydrogen storage and desorption kinetics of Mg1.7Nd0.3Ni alloy prepared by SPS is better, but the hydrogen storage capacity, hydrogen release rate and PCT curve platform performance worse.