主催: 一般社団法人 日本機械学会
会議名: 2016年度 年次大会
開催日: 2016/09/11 - 2016/09/14
This study deals with the assessment of the hydrogen absorption-desorption properties of Mg-based composites containing TiFe0.8Mn0.2, Fe, and graphite (Mg-10Gr, Mg-10TFM-10Fe, Mg-10TFM-10Gr, Mg-10Fe-10Gr, and Mg-5TFM-5Fe-10Gr) that were gotten with ball milling under Ar atmosphere. The TiFe0.8Mn0.2 and Fe were used as catalysts for improving hydrogen absorption-desorption properties of Mg and the graphite to prevent them from oxidizing. We conducted hydrogenation, X-ray diffraction (XRD) analyses, differential scanning calorimetries (DSC), and Pressure-Composition-Temperature (PCT) measurements for the samples. MgH2 was observed in Mg-10TFM-10Gr, Mg-10Fe-10Gr, and Mg-5TFM-5Fe-10Gr with XRD analyses after hydrogenation at 200℃ under hydrogen pressure of 2.5–2.6 MPa. It might be that the added graphite prevented from oxidizing from the samples and consequently enhanced the catalytic effects of TiFe0.8Mn0.2 and Fe. These samples desorbed hydrogen around 275–350℃ in DSC processes. Mg-10TFM-10Gr, Mg-10Fe-10Gr, and Mg-5TFM-5Fe-10Gr stored hydrogen up to 2.5 wt.%, 3.5 wt.%, and 4.0 wt.%, respectively at 200℃ under hydrogen pressure of 2.6 MPa on PCT measurements without any activation process, and Mg-5TFM-5Fe-10Gr stored hydrogen up to 4.1 wt.% at 200℃ and 4.8wt.% at 280℃ under hydrogen pressure of 2.6 MPa after activation.