CAJ | 학술논문

利用真空感应熔炼和退火方法制备了LaMg8.40Ni2.34合金,采用X射线衍射(XRD)分析、扫描电镜(SEM)和压力-组成-温度(PCT)测试仪测试了合金的相组成、微观形貌和储氧性能,LaMg8.40Ni2.34合金由La2Mg17、LaMg2Ni和Mg2Ni组成,且在第一次吸放氢循环中就可以完全活化,在558 K下的可逆储氢量为3.01%(质量分数),合金的PCT曲线表现出双吸氢平台,分别对应着形成的MgH2和Mg2NiH4,但是放氢曲线却只有一个平台出现,这是由MgH2和Mg2NiH4之间的协同脱氢作用产生的.LaMg8.40Ni2.34合金在吸放氢时的活化能分别为(52.4±0.4)和(59.2±0.1)kJ·mol-1,均低于Mg2Ni合金,与纯Mg和Mg2Ni合金相比,LaMg8.40Ni2.34合金具有良好的活化性能、较高的储氢性能和优良的动力学性能.
이용진공감응용련화퇴화방법제비료LaMg8.40Ni2.34합금,채용X사선연사(XRD)분석、소묘전경(SEM)화압력-조성-온도(PCT)측시의측시료합금적상조성、미관형모화저양성능,LaMg8.40Ni2.34합금유La2Mg17、LaMg2Ni화Mg2Ni조성,차재제일차흡방경순배중취가이완전활화,재558 K하적가역저경량위3.01%(질량분수),합금적PCT곡선표현출쌍흡경평태,분별대응착형성적MgH2화Mg2NiH4,단시방경곡선각지유일개평태출현,저시유MgH2화Mg2NiH4지간적협동탈경작용산생적.LaMg8.40Ni2.34합금재흡방경시적활화능분별위(52.4±0.4)화(59.2±0.1)kJ·mol-1,균저우Mg2Ni합금,여순Mg화Mg2Ni합금상비,LaMg8.40Ni2.34합금구유량호적활화성능、교고적저경성능화우량적동역학성능.
The LaMg8.40Ni2.34 alloy was prepared by vacuum induction melting and subsequent heating treatment.The phase structure,morphology,and hydrogen storage properties were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and pressure-composition-temperature(PCT)measurements.The LaMg8.40Ni2.34 alloy was composed of La2Mg17,LaMg2Ni,and Mg2Ni phases.The alloy can be activated in the first hydriding/dehydriding process.Its reversible hydrogen storage capacity was3.01%(mass fraction)at 558 K.PCT curves showed two hydriding plateaus corresponding to the formation of MgH2 and Mg2NiH4 and only one dehydriding plateau,which is due to the synergetic effect of hydrogen desorption between MgH2 and Mg2NiH4.The activation energy values of LaMg8.40Ni2.34 alloy were(52.4+0.4)than that of the Mg2Ni alloy.The LaMg8.40Ni2.34 alloy exhibited good activation behavior,hydrogen adsorption and desorption reversibility,and kinetic properties.