摘要
采用正交实验设计方法安排实验,运用L9(34)优化氢化燃烧法合成La1.5Ni0.5Mg17的工艺,考察了施压制饼时间、合成保温时间、合成起始氢气压力、保温温度4个因素对储氢材料的储放氢容量和速率的影响,通过直观分析和方差分析得出优化的工艺为:保温温度903K,制饼施压时间40min,合成起始氢气压力为1MPa,合成保温时间1800min。此条件下合成储氢材料La1.5Ni0.5Mg17在573K的储放氢容量分别为:5.40和5.15%H(质量分数);储放氢速率分别为:0.734和0.681%H min。用XRD分析了材料吸氢和脱氢后的物相结构发现:用Ni适量取代La2Mg17中的La没有导致结构变化,存在的LaNi5,LaH3和La改善了材料的吸放氢速率。
The experiment was designed by orthogonal test and the technics for La_(1.5)Ni_(0.5)Mg_(17) by hydriding combustion synthesis was optimized according to L_9(3~4). The influence on hydrogen storage capacity and hydriding dehydriding rate of material was investigated and optimum hydrogen storage alloy was obtained by the technics at 903 K for 1800 min, the compressive pressure for the compact is 1 MPa for 40 min. The maximum hydrogen absorption/desorption capacities of La_(1.5)Ni_(0.5)Mg_(17) are 5.40 and 5.15 mass% H, its hydriding/dehydriding rates are 0.734 and 0.681 mass% H/min, respectively. The XRD results explain that it is no change in structure of La_2Mg_(17) after substituted with Ni for La and catalytic effect of LaNi_5, LaH_3 and La are beneficial to the improvement on kinetics property of La_(1.5)Ni_(0.5)Mg_(17) alloy.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第6期652-656,共5页
Journal of the Chinese Society of Rare Earths
基金
国家973计划资助项目(G2000026405)
