The Study of Hydrogen Storage Characteristics of Ti-153 Cathode through Powder Metallurgical Processing

• Main Authors: Yi-Ting Lee, 李怡婷
• Other Authors: Tair-I Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/4fy7rc

碩士 === 大同大學 === 材料工程學系(所) === 102 === Ti-153 sheet specimens were adopted in this study to be treated by thermohydrogen processing to obtain the original alloy powder. The alloy powder was further employed in producing porous cathodes with various porosities to see their hydrogen uptake ability after a designed cyclic hydrogenation treatment and hydrogen evolution ability after vacuum degassing at 300oC - 3.0×10-2 torr. The microstructural changes were investigated by using X-ray diffractometry (XRD). Particle size, surface morphology variations and pore distribution were observed by employing scanning electron microscopy (SEM). Elemental analyzer (EA) was applied to obtain hydrogen contents of processed specimens. The optimal cathode was acquired after Ti-153 sheet specimens processed according to the HPb parameters: (1) powder processing – 300oC-H2(g) 5MPa-15hrs and (2) hot press sintering (25MPa) – 700oC-1.0×10-2 torr.-2hrs. The apparent density of the optimal cathode is 3.857 g/cm3 and the porosity was evaluated as 20.60%. The hydrogen content of the HPb specimen after the designed cyclic hydrogenation treatment was 2.854wt% which is close to the saturated concentration of hydrogen in titanium alloys. After the HPb specimen had been degassed at 300oC- 3.0×10-2 torr for two hours (designated as bVH4D), of which the hydrogen content was lowered to 1.224wt%. The calculated hydrogen uptake and hydrogen evolution payloads for the porous specimen (HPb) in contrast to the bulk one (B0) are 1.82 and 2.21 respectively.