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  1. 0 資料タイプ別
  2. 02 学位論文
  1. 230 大学院自然科学研究科
  2. 60 博士学位論文
  3. 10 博士学位論文

Metal-Hydride Formation Mechanism Measured by Acoustic Emission Methods

http://hdl.handle.net/10191/35574
http://hdl.handle.net/10191/35574
c3e334b2-9895-476f-8efa-aea17c671708
名前 / ファイル ライセンス アクション
h27ftk431.pdf 本文 (1.2 MB)
h27ftk431_a.pdf 要旨 (207.2 kB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2015-12-14
タイトル
タイトル Metal-Hydride Formation Mechanism Measured by Acoustic Emission Methods
タイトル
言語 en
タイトル Metal-Hydride Formation Mechanism Measured by Acoustic Emission Methods
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_46ec
タイプ thesis
その他のタイトル
その他のタイトル アコースティック・エミッション法による金属の水素化機構の解明
著者 Piao, Jiaxiang

× Piao, Jiaxiang

WEKO 50675

Piao, Jiaxiang

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著者別名
識別子 50676
識別子Scheme WEKO
姓名 朴, 甲相
抄録
内容記述タイプ Abstract
内容記述 Hydrogen storage alloys are important in the energy storage area because of that these alloys have the capacity to absorb and desorb amount of hydrogen. There are a lot of interests in the formation mechanism of metallic hydride. It has been known that the change of lattice energy of a transition metal by hydrogenation is interpreted in the terms of the lattice expansion and the change of Fermi level by our research group. In this thesis, we focus on the phenomenon of that metal transformed by slight stress in the case of hydrogenation easily and want to clarify the formation mechanism of metallic hydride. We will propose acoustic emission measurement methods by using gas pressure technique and electrochemical charging technique in order to obtain the dynamical information of hydrogenation process of palladium. The analysis with the experimental results was discussed by the dislocation theory. This thesis includes 4 chapters. In the first chapter, the motive and purpose of this research was stated. In the second chapter, a hydrogenation process of palladium has been studied by acoustic emission (AE) methods with a new gas pressure cell. By using noble Ar gas, the AE events were observed intermittently for the stepwise pressurization. On the repetition of the re-pressurization, the AE events showed the Kaiser effect, i.e., a dislocation motion induced effect. The typical power spectrum of AE signal by noble gas demonstrated the fundamental signal modes of 250 and 550 kHz. By the hydrogen gas re-pressurization, the characteristic AE behavior was recognized as following: 1) The continuous AE events were observed by the stepwise pressurization, 2) in the early stage of primary H solid solution of Pd, the fundamental AE modes were measured as 250 and 550 kHz, 3) in the hydride formation stage, the continuous AE events were also observed, and the typical AE mode was changed to 250 kHz mainly. The hydride formation mechanism was discussed on the basis of the dislocation theory. From these results, when a hydrogen atom is dissolved into an fcc metallic lattice, it occupies an interstitial octahedral site and pushes aside metal atoms around its site as is recognized from the lattice expansion induced by hydrogenation. In the third chapter, a hydrogenation process of Pd was studied by AE method with a new electrochemical hydrogen charging technique. The AE measurement method with the electrochemical separated AE cell by removing coexisted AE waves with generated H_2/O_2 gas on the counter electrode. Characteristic AE power spectra caused by cavitation and /or bubble burst have been appraised by using an electrochemical separated AE cell. The characteristic of the AE power spectrum due to Pd hydride formation was around 250 kHz. In the second chapter, the spectrum was evaluated as 250 kHz obtained using gas pressure AE cell. This means that the AE method with the electrochemical AE cell will be a powerful way to investigate the hydride formation mechanism because the high H_2 gas pressure condition can be easily provided by hydrogen over voltage. In the forth chapter, we make a conclusion about this thesis. We established the validity of the AE measurement methods by using gas pressure technique and electrochemical charging one. And, we propose that the partial dislocation of Pd lattice will play an important role in hydride formation. Finally we will propose that this research could contribute to the research and development of, for instance, aluminum based hydride alloys which crystal structure will drastically change by hydrogenation.
内容記述
内容記述タイプ Other
内容記述 学位の種類: 博士(工学). 報告番号: 甲第4080号. 学位記番号: 新大院博(工)甲第431号. 学位授与年月日: 平成27年9月24日
書誌情報 p. 1-55, 発行日 2015-09-24
出版者
出版者 新潟大学
著者版フラグ
値 ETD
学位名
学位名 博士(工学)
学位授与機関
学位授与機関名 新潟大学
学位授与年月日
学位授与年月日 2015-09-24
学位授与番号
学位授与番号 13101甲第4080号
学位記番号
内容記述タイプ Other
内容記述 新大院博(工)甲第431号
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