JPWO2020067356A1 - 蓄冷材、冷凍機、超電導コイル組込装置及び蓄冷材の製造方法 - Google Patents
蓄冷材、冷凍機、超電導コイル組込装置及び蓄冷材の製造方法 Download PDFInfo
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Abstract
Description
以下、実施形態について詳細に説明する。図1は第1実施形態に係る蓄冷材の結晶構造を示すThCr2Si2型構造11の模型図である。第1実施形態に係る蓄冷材は、ThCr2Si2型構造11が80体積%以上占める金属間化合物からなる粒体であり、結晶子サイズが70nm以下である。
L=Kλ/(βcosθ) (1)(但し、K;Scherrer定数、λ;使用X線の波長)
なお機械的強度は振動試験により評価することができる。
図3は、第2実施形態に係る冷凍機30として例示される2段膨張式のGM冷凍機の断面図である。この冷凍機30は、大径の第1シリンダ31と、この第1シリンダ31と同軸的に接続された小径の第2シリンダ32と、を有している。第1シリンダ31には第1蓄冷器34が往復動自在に配置されており、第2シリンダ32には第2蓄冷器35が往復動自在に配置されている。第1シリンダ31と第1蓄冷器34との間、及び第2シリンダ32と第2蓄冷器35との間には、それぞれシールリング36、37が配置されている。
図4は、第3実施形態に係る超電導コイル組込装置の一例を示す核磁気共鳴診断装置(magnetic resonance imaging;MRI装置)50の断面図である。このMRI装置50による診断は、被検者52が横臥する可動式の台(図示せず)を、トンネル状のボア空間51の中に移動させる。そして、第1電磁石53により静磁場を、第2電磁石54により傾斜磁場を印加する。
次に実施例1についてより具体的に説明する。金属間化合物DyCu2Ge2の成分である元素金属を原料とし、量論比で配合し溶融して、ロール急冷法でノズルとロール間の距離を0.5mmに設定し、冷却速度105〜106℃/secで急冷凝固処理した薄片状試料を作製した。そして比較例1として、配合及び溶融の条件を実施例1と共通にし、アーク溶解法を用いて冷却速度102℃/secで徐冷凝固処理したバルク状試料を作製した。
ノズルとロール間の距離を0.6mmにしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
ノズルとロール間の距離を0.7mmにしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
配合及び溶融の条件を比較例1と共通にし、凝固点以下の800℃で1週間熱処理し、バルク状試料を作製した。なおこの比較例2の試料の作製条件は、上記の非特許文献1の開示条件を再現したものである。
凝固点以下の900℃で4日間熱処理したこと以外は比較例2と同様に、バルク状試料を作製した。
凝固点以下の800℃で4日間熱処理したこと以外は比較例2と同様に、バルク状試料を作製した。
凝固点以下の700℃で4日間熱処理したこと以外は比較例2と同様に、バルク状試料を作製した。
配合の条件を実施例1と共通にし、高周波溶解法を用いて冷却速度102℃/secで徐冷凝固処理したバルク状試料を作製した。
組成をDyCu2Si2にしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
組成をDyCu2Si2にしたこと以外は比較例1と同様の条件でバルク状試料を作製した。
凝固点以下の900℃で4日間熱処理したこと以外は比較例7と同様に、バルク状試料を作製した。
組成をGdCu2Si2にしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
組成をGdCu2Si2にしたこと以外は比較例1と同様の条件でバルク状試料を作製した。
凝固点以下の900℃で4日間熱処理したこと以外は比較例9と同様に、バルク状試料を作製した。
組成をPrCu2Si2にしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
組成をPrCu2Si2にしたこと以外は比較例1と同様の条件でバルク状試料を作製した。
凝固点以下の900℃で4日間熱処理したこと以外は比較例11と同様に、バルク状試料を作製した。
組成をNdCu2Si2にしたこと以外は実施例1と同様の条件で薄片状試料を作製した。
組成をNdCu2Si2にしたこと以外は比較例1と同様の条件でバルク状試料を作製した。
凝固点以下の900℃で4日間熱処理したこと以外は比較例13と同様の条件でバルク状試料を作製した。
Claims (6)
- ThCr2Si2型構造が80体積%以上占める金属間化合物からなる粒体であり、結晶子サイズが70nm以下である蓄冷材。
- 請求項1に記載の蓄冷材であって、
前記粒体は、
粒径が0.01mm〜1mmの範囲に含まれ、
投影像の面積をAとし前記投影像に外接する最小の外接円の面積をMとした場合、全ての投影方向において、M/Aで表される形状係数が1.0〜5.0の範囲に含まれる蓄冷材。 - 請求項1又は請求項2に記載の蓄冷材であって、
前記ThCr2Si2型構造において、ThサイトはLa、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Sc及びYからなる群から選択される少なくとも1種の元素で、CrサイトはTi、V、Cr、Mn、Fe、Co、Ni、Cu、Ru、Rh、Pd、Ir及びPtからなる群から選択される少なくとも1種の元素で、SiサイトはSi及びGeから選択される少なくとも1種の元素である蓄冷材。 - 請求項1から請求項3のいずれか1項に記載の蓄冷材を搭載した冷凍機。
- 請求項4に記載の冷凍機を搭載した超電導コイル組込装置であって、冷凍機に搭載されている蓄冷材の外部磁場1000Oe、温度が5K以下における磁化が10emu/g以下である超電導コイル組込装置。
- ThCr2Si2型構造を取り得る金属間化合物の成分元素をその量論比で配合し溶融する工程と、
前記溶融した液体を、動的な冷却媒体に注入し急冷凝固させ粒体にする工程と、を含む蓄冷材の製造方法。
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JP2013189543A (ja) * | 2012-03-13 | 2013-09-26 | Toyama Univ | 磁気冷凍材料、蓄冷材料及びそれを用いた冷凍システム |
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CN1143104C (zh) * | 1994-08-23 | 2004-03-24 | 株式会社东芝 | 超低温用蓄冷材料及采用该蓄冷材料的超低温用蓄冷器 |
JP3677818B2 (ja) | 1995-06-29 | 2005-08-03 | アイシン精機株式会社 | 蓄冷器 |
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JP2023182630A (ja) | 2023-12-26 |
CN115574481A (zh) | 2023-01-06 |
US20230002663A1 (en) | 2023-01-05 |
EP3858944A1 (en) | 2021-08-04 |
US20210309904A1 (en) | 2021-10-07 |
US20230002662A1 (en) | 2023-01-05 |
CN112752824B (zh) | 2022-11-04 |
IL281571A (en) | 2021-05-31 |
JP2023174677A (ja) | 2023-12-08 |
WO2020067356A1 (ja) | 2020-04-02 |
JP7355751B2 (ja) | 2023-10-03 |
CA3112908A1 (en) | 2020-04-02 |
RU2771034C1 (ru) | 2022-04-25 |
CN112752824A (zh) | 2021-05-04 |
EP3858944A4 (en) | 2022-06-22 |
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