摘要
利用自制25kg级BaZrO3坩埚,通过ZG-0.05型真空感应熔炼制备TiFe基储氢合金。熔炼条件为：0.6 MPa氩气保护气氛,精炼时间5~10min,精炼温度1 450℃左右。采用ICP原子发射光谱分析仪分析所熔合金的化学成分,利用金相显微镜、扫描电子显微镜、XRD衍射仪研究了合金的金相组织、表面形貌、微区元素分布、物相结构,用气体反应控制器测定了合金的PCT曲线。研究表明：由BaZrO3坩埚熔炼的TiFe基储氢合金氧质量分数与石墨坩埚熔炼的合金氧质量分数均小于0.1%,而石墨坩埚熔炼的合金碳质量分数为0.417%。BaZrO3坩埚熔炼后的合金完全由等轴晶构成,而石墨坩埚熔炼后的合金则由等轴晶组织和在晶粒内或沿晶界分布的球形TiC颗粒组成。BaZrO3坩埚所熔炼的合金不仅最大吸氢量比石墨坩埚熔炼的合金的最大吸氢量大,而且吸放氢平台压力也低。
TiFe-based hydrogen storage alloy was prepared by using a self-made 25 kg BaZrO3crucible with ZG-0.05 type vacuum induction melting system.The melting conditions are argon atmosphere of 0.6MPa,refining time of 5~10 min and temperature of 1 450 ℃.The chemical composition of the as-cast sample was examined by means of inductive coupled plasma emission spectrometer（ICP）first,and then itsmicrostructure,surface topography,element distribution in micro-domains and phase were examined by optical microscopy（OM）,scanning electron microscopy（SEM）,X-ray diffraction（XRD）and energy dispersive spectrometer（EDS）,and finally its PCT curves were measured by gas reaction controller.The results show that,the oxygen contents of alloys prepared by the BaZrO3 crucible and the graphite crucible are are less than 0.1%（ω）,meanwhile the carbon content of alloys obtained by the electro graphite crucible is 0.417%（ω）,which exceeds the tolerance of commercial alloys（1 000ppm）.The microstructure of the alloy melted by the BaZrO3 crucible is equiaxed crystal,but the alloy melted by the graphite crucible is composed of the equiaxed crystal and the spherical TiC particles distributed along grain boundaries or within the grain.The maximum amount of hydrogen absorption of the alloy melted by the BaZrO3 crucible is larger than that of the alloy melted by the graphite crucible,and the hydrogen desorption and absorption plateau pressure of the alloy meted by the BaZrO3 crucible is also lower.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第2期107-113,共7页
Journal of Chongqing University
基金
国家重点基础研究发展计划(973计划)(2014CB643403)
国家自然科学基金项目(51225401
51374142)
上海市科委基金项目(11520500100
14JC1491400)~~
关键词
TIFE合金
储氢性能
BaZrO3坩埚
真空感应熔炼
增碳
TiFe alloy
hydrogen storage property
BaZrO3 refractory
vacuum induction melting
carbon contamination
