成果報告書詳細
管理番号20120000000279
タイトル*平成23年度中間年報 水素先端科学基礎研究事業 水素先端科学基礎研究 高圧水素ガス用ひずみゲージの開発とひずみゲージ箔材の電気抵抗に及ぼす水素の影響の解明
公開日2013/3/20
報告書年度2011 - 2011
委託先名株式会社共和電業
プロジェクト番号P06026
部署名新エネルギー部
和文要約【和文要約等以下本編抜粋】:
1. 共同研究の内容及び成果等
今まで,高圧水素ガス環境下での使用を目的とした応力測定用ひずみゲージは開発されていない。既製のひずみゲージでは,高圧水素ガス中で無負荷状態での電気抵抗変化が大きくなる難点が生じた.このため,高圧水素ガス中での材料試験,機器の応力測定の安定的な実施に障害をきしている。
本研究においては, 高圧水素ガス中でのひずみゲージ抵抗変化の解明を行うためにひずみゲージ箔材の結晶構造解析並びに水素拡散速度と水素固容度の測定を行う.次に,ひずみゲージの高圧水素中での無負荷および負荷時の電気抵抗変化を測定する。
これより高圧水素中のひずみゲージの電気抵抗変化に及ぼす水素影響を評価し,ひずみゲージの電気抵抗変化が発生するメカニズムを解明し,高圧水素ガス用ひずみゲージを開発する。
本年度は,ひずみゲージ箔材用金属材料として使われているCu-Ni,Fe-Cr-Al に加え,Ni-Cr並びにはんだ(Sn-Ag-Cu)とゲージリード(銅線)の結晶構造解析と水素拡散速度・固溶度の測定及び, 大気中における水素放出時の電気抵抗測定を開始した。
また,平成22 年度に製作した水素ガス試験容器で, 高圧水素ガス中でのひずみゲージ,ひずみゲージ箔材及び板材の電気抵抗変化の測定と,外力負荷時のひずみゲージの電気特性に及ぼす水素の影響評価における測定を行った。
以下に各項目についての研究成果を報告する。
英文要約Title: Development of Strain Gage for High Pressure Hydrogen Gas and Resolution of Influence of Hydrogen upon the Resistance of the Metal Foil (FY2010-FY2012) FY2011 Annual Report

In the 2011, we started conducting the analysis of microstructure, measurement of hydrogen diffusion coefficients, solubility, and electronic resistance under the atmospheric pressure after the hydrogen gas is released. The materials to be measured in the 2011 were Ni-Cr, solder (Sn-Ag-Cu), and gage leads (copper wire) as well as the Cu-Ni and Fe-Cr-Al - the metallic materials for strain gages. We measured the electronic resistances of strain gages, foil materials of strain gages, and plate material for strain gages in high-pressure hydrogen gas. We also evaluated the influence of hydrogen that changes the electrical characteristics of the strain gages while applying the external load. (1) Metals of strain gage are foil, copper gage leads, and solder. We investigate the structure and hydrogen-invasion property of the metals and relationship between the electrical properties and the amount of hydrogen. ●Cu-Ni, Ni-Cr, and Cu had Face Centered Cubic (FCC) structure. Fe-Cr-Al had Body Centered Cubic (BCC) structure. ●The hydrogen diffusion rates are Fe-Cr-Al > Cu-Ni > Ni-Cr > Cu. The saturated hydrogen quantities are Cu < Fe-Cr-Al < Cu-Ni < Ni-Cr. ●As the amount of hydrogen increases, the change of electrical resistance is expected to rise. ●The Fe-Cr-Al is the suitable metal in high-pressure hydrogen gas. Since Cu has small hydrogen-invasion property, the change of electrical resistance can be considered 0. We concluded that using the copper wire as gage leads is no problem. We will clarify about the solder. (2) We made 2 types of strain gages for the test in the high-pressure hydrogen gas. Those were Cu-Ni Foil Strain Gages with 6 um thickness and Ni-Cr Foil Strain Gages with 5 um thickness.(3) We measured the electronic resistances of strain gages (Cu-Ni, Fe-Cr-Al, and Ni-Cr) in high-pressure hydrogen gas while not applying the external load. We also measured the electronic resistances of strain gages in high-pressure nitrogen gas. ●The outputs of the Cu-Ni strain gages and Ni-Cr strain gages vary with the existing of the high-pressure hydrogen gas. ●The output of the Fe-Cr-Al strain gages has no difference between the hydrogen gas and nitrogen gas. ●Each material is different on the influence with only pressure. We also conducted the same measurements by using the foil materials of strain gages and plate material for strain gages. We obtained the tendency same to strain gages. However, these changing rates of electronic resistances are not same. (4) We applied strains to strain gages in high-pressure hydrogen or nitrogen gas. By comparing the results, we concluded that hydrogen gas and nitrogen gas have the same effect on strain amount.
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