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针对石墨坩埚熔炼TiFe合金增碳的缺点,对三高石墨坩埚和CaZrO3坩埚真空感应熔炼TiFe基储氢合金进行了对比研究.用ICP原子发射光谱仪分析合金的化学成分,并用Leca金相显微镜、SEM、XRD分析其金相组织、表面形貌、微区元素分布和物相结构,测定了合金的吸放氢PCT曲线.结果表明,两种坩埚熔炼TiFe合金的氧含量相当且未见增碳,但三高石墨坩埚熔炼合金的碳含量为0.220%(ω),超过0.1%(ω)的技术要求;其次CaZrO3坩埚熔炼合金具有枝晶组织,而后者熔炼合金则由层片状结构的等轴晶组织和沿晶界或在晶粒内分布的球形TiC颗粒构成;经CaZrO3坩埚和三高石墨坩埚熔炼合金的最大吸氢量分别为1.823%(ω)和1.832%(ω),即CaZrO3坩埚可代替三高石墨坩埚熔炼制备TiFe储氢合金.
Aiming at the shortcomings of carbon melting of graphite crucible and TiFe alloy, the TiFe-based hydrogen storage alloys were vacuum-melted in three-high graphite crucible and CaZrO3 crucible, and the chemical composition of the alloy was analyzed by ICP atomic emission spectrometer. , XRD analysis of the microstructure, surface morphology, micro-elemental distribution and phase structure, measured the absorption and desorption PCT curve of the alloy.The results show that the two crucible smelting TiFe alloy oxygen content and no significant increase, However, the carbon content of the Sankoh graphite crucible melting alloy is 0.220% (ω) and exceeds 0.1% (ω). Secondly, the CaZrO3 crucible smelting alloy has dendritic structure, while the latter smelting alloy is composed of lamellar structure Crystal structure and spherical TiC particles distributed along the grain boundaries or within the grains. The maximum hydrogen absorption of the alloy melted by the CaZrO3 crucible and the three high graphite crucibles were 1.823% (ω) and 1.832% (ω), respectively, namely CaZrO3 crucible TiFe hydrogen storage alloy can be prepared instead of the high graphite crucible.