Diffusion of liquid metals and alloys: The study of self-diffusion under microgravity in liquid Sn in the wide temperature range

• Material Type: 文書・図像類
• Title: Diffusion of liquid metals and alloys: The study of self-diffusion under microgravity in liquid Sn in the wide temperature range
• Author/Editor: 伊丹, 俊夫; 青木, 拓克; 兼子, 稔; 内田, 美佐子; 志佐, 陽; 天野, 真一; 小田原, 修; 正木, 匡彦; 織田, 裕久; 大井田, 俊彦; Itami, Toshio; Aoki, Hirokatsu; Kaneko, Minoru; Uchida, Misako; Shisa, Akira; Amano, Shinichi; Odawara, Osamu; Masaki, Tadahiko; Oda, Hirohisa; Oida, Toshihisa
• Author Heading: 伊丹, 俊夫; 青木, 拓克; 兼子, 稔; 内田, 美佐子; 志佐, 陽; 天野, 真一; 小田原, 修; 正木, 匡彦; 織田, 裕久; 大井田, 俊彦; Itami, Toshio; Aoki, Hirokatsu; Kaneko, Minoru; Uchida, Misako; Shisa, Akira; Amano, Shinichi; Odawara, Osamu; Masaki, Tadahiko; Oda, Hirohisa; Oida, Toshihisa
• Publication, Distribution, etc.: 宇宙開発事業団
• Publication Date: 2001-03-01
• Publication Date (W3CDTF): 2001-03-01
• Alternative Title: 液体金属および合金の拡散:微小重力下における広温度範囲にわたる液体Sn中の自己拡散の研究
• Periodical title: 宇宙開発事業団技術報告 = NASDA Technical Memorandum
• Pages: 55-62
• ISSN (Periodical Title): ISSN : 1345-7888
• Text Language Code: eng
• Subject Heading: 自己拡散係数; 液体Sn; 微小重力環境; MSLミッション; 材料科学実験室; 温度依存性; 長毛管法; マランゴニ対流; Sn同位体; 濃度分布; 剛体球模型; self diffusion coefficient; liquid Sn; microgravity environment; MSL mission; material science laboratory; temperature dependence; long capillary method; Marangoni convection; Sn isotope; concentration profile; hard sphere model
• Target Audience: 一般
• Note (General): 高融点融液中の拡散の研究に対する微小重力の有効性を確認し、また、微小重力下の正確な拡散データに基づいて拡散の温度依存性を検討するため、MSL(材料科学実験室)-1ミッション時に広い温度範囲にわたり微小重力下の液体Snの自己拡散を研究した。長毛管法を用いて、900、1,191、1,423および1,622Kの温度における自己拡散係数を測定した。著しい体積変化に対処し、液体中のマランゴニ対流発生を防止するため炭素ばねを用いて実験中を通して液体試料に微弱な圧力を印加した。広い接触角を有し液体Snに対して濡れ性を持たない黒鉛を試料容器の材料に選択した。濃縮安定同位体Sn-124をトレーサとして採用し、純度5Nの天然Snを母体に用いた。試料中のSn-124の濃度分布をSIMS(2次イオン質量分析法)により分析した。自己拡散係数は温度の関数として反復法を使って決定した。実験値と計算値の間でかなり良く一致した。MSL-1ミッションで長毛管法を用いて求めた自己拡散係数の温度依存性を検討した。温度依存性は温度の冪乗則で要約され、冪指数1.8を得た。自己拡散係数の実験データは1,622Kまでの高温度範囲においても、1,100Kを超える温度に対して地上実験データに観測されたような急激な増加を示さなかった。充填率を0.464として、剛体球模型に基づいて自己拡散係数を計算した。温度依存性は方程式から1.77の冪指数を得た。; The self-diffusion of liquid Sn under microgravity was studied in the wide temperature range in the MSL (Material Science Laboratory)-1 mission to confirm the validity of microgravity for the study of diffusion in melts with high melting temperature and to investigate the temperature dependence of diffusion based on the exact diffusion data under microgravity. The self-diffusion coefficient was measured at temperature of 900, 1,191, 1,423 and 1,622 K by the use of the long capillary method. Carbon spring was used to apply the slight pressure to the liquid sample throughout the course of experiments to cope with the considerable volume change and to prevent the Marangoni convection in liquids. The graphite was selected as the material for a sample container because of its non-wetting property to liquid Sn with a wide contact angle. The enriched stable isotope Sn-124 was employed as the tracer and natural Sn of 5 N purity was employed as the counter part. The concentration profile of Sn-124 in the sample was analyzed by SIMS (Secondary Ion Mass Spectroscopy) analysis. The self-diffusion coefficient was determined as a function of temperature using the iteration method. A considerably good agreement between experiments and calculations was obtained. The temperature dependence of self-diffusion coefficient obtained by the long capillary method in MSL-1 mission was investigated. The temperature dependence was summarized by means of the power law of temperature, and 1.81 of the power index was obtained. The experimental data of self-diffusion coefficient did not show such an abrupt increase even in higher temperature range up to 1,622 K as that shown in ground experiment data for temperature over 1,100 K. The self-diffusion coefficient was calculated based on the hard sphere model adopting the packing fraction of 0.464. The power index of 1.77 for the temperature dependence was obtained from the equation.; 資料番号: AA0029039007; レポート番号: NASDA-TMR-000013E
• Source: https://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=41866&item_no=1&attribute_id=31&file_no=1
• Access Restrictions: 限定公開
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ