JP6495546B1 - HoCu系蓄冷材並びにこれを備えた蓄冷器及び冷凍機 - Google Patents
HoCu系蓄冷材並びにこれを備えた蓄冷器及び冷凍機 Download PDFInfo
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- 230000005290 antiferromagnetic effect Effects 0.000 description 1
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Abstract
本発明は、具体的には、一般式(1)
HoCu2−xMx (1)
〔式中、xは0<x≦1を示す。MはAl及び遷移金属元素(但しCuを除く)の少なくとも一種を示す。〕
で表されることを特徴とするHoCu系蓄冷材、並びにこれを備えた蓄冷器及び冷凍機を提供する。
Description
1.一般式(3)
HoCu2−xAlx (3)
〔式中、xは0<x<1を示す。〕
で表され、
KHg2型構造(体心直方晶、ピアソン記号:oI12)の結晶構造を主相とし、更に第二相としてHoCuAl相を有し、10K以上の温度領域においてHoCu2よりも高い比熱を有する、
ことを特徴とするHoCu系蓄冷材。
2.一般式(4)
(Ho1−yREy)Cu2−x Al x (4)
〔式中、xは0<x≦1を示す。yは0<y<1を示す。REは希土類元素(但しHoを除く)を示す。〕
で表され、
KHg2型構造(体心直方晶、ピアソン記号:oI12)の結晶構造を主相とし、更に第二相としてHoCuAl相を有し、10K以上の温度領域においてHoCu2よりも高い比熱を有する、
ことを特徴とするHoCu系蓄冷材。
3.上記項1又は2に記載のHoCu系蓄冷材が単独で又は他の蓄冷材と組み合わせて充填されている蓄冷器。
4.前記HoCu系蓄冷材は、1)球状粉の粒子群の状態、又は2)球状粉の粒子群の焼結体の状態である、上記項3に記載の蓄冷器。
5.上記項3又は4に記載の蓄冷器を備えた冷凍機。
本発明のHoCu系蓄冷材は、HoCu2(ホルミウム銅2)に含まれるCuの一部がAl及び遷移金属元素(但しCuを除く)の少なくとも一種に置換された構造であり、下記一般式(1)
HoCu2−xMx (1)
〔式中、xは0<x≦1を示す。MはAl及び遷移金属元素(但しCuを除く)の少なくとも一種を示す。〕
で表されることを特徴とする。
HoCu2−xNix (2)
〔式中、xは0<x≦1を示す。〕
で表され、xは0<x≦1の範囲内であればよいが、特に0<x≦0.8が好ましく、0<x≦0.5がより好ましい。一般式(2)で表されるHoCu系蓄冷材は、実質的に単相合金(KHg2型構造)である。
HoCu2−xAlx (3)
〔式中、xは0<x<1を示す。〕
で表され、xは0<x<1の範囲内であればよいが、特に0<x≦0.8が好ましく、0<x≦0.5がより好ましい。一般式(3)で表されるHoCu系蓄冷材は、KHg2型構造を主相とし、更に第二相(マイナー相)としてHoCuAl相などを有する。
(Ho1−yREy)Cu2−xMx (4)
〔式中、xは0<x≦1を示す。MはAl及び遷移金属元素(但しCuを除く)の少なくとも一種を示す。yは0<y<1を示す。REは希土類元素(但しHoを除く)を示す。〕
で表されることを特徴とする。
(Ho1−yEry)Cu2−xNix (5)
〔式中、xは0<x≦1を示す。yは0<y<1を示す。〕
で表され、xは0<x≦0.8が好ましく、0<x≦0.5がより好ましい。yは0<y<1の範囲内であればよいが、xの量、比熱ピークのシフトを勘案して所定の比熱ピーク温度となるようにy量を調整してもよい。
本発明のHoCu系蓄冷材は、それを単独又は他の蓄冷材と組み合わせて充填することにより蓄冷器を構成することができる。他の蓄冷材としては限定されず、公知の蓄冷材を適宜組み合わせることができる。また、当該蓄冷器を備えた冷凍機(例えば、液体水素製造用冷凍機、10K特化冷凍機等)を構成することができる。また、4KGM冷凍機において、低温端側材料と例えば80Kまでを担当する材料との間に本発明のHoCu系材料を組み込むことが可能である。
(1−実測重量/(見かけ体積×比重))×100
〔但し、見かけ体積は例えば円柱状の試料の場合、直径と長さから求めた体積を示す。〕により求められる値を意味する。
先ず、溶解・鋳造後に表1に示す各組成となるように配合した原料を準備し、高周波加熱溶解炉にてアルゴンガス雰囲気下で溶解し、合金溶融物を得た。
図2のX線回折結果からは、比較例1、実施例1、2の各合金粉末は、共に主相にKHg2型構造を有することが分かる。
Claims (5)
- 一般式(3)
HoCu2−xAlx (3)
〔式中、xは0<x<1を示す。〕
で表され、
KHg2型構造(体心直方晶、ピアソン記号:oI12)の結晶構造を主相とし、更に第二相としてHoCuAl相を有し、10K以上の温度領域においてHoCu2よりも高い比熱を有する、
ことを特徴とするHoCu系蓄冷材。 - 一般式(4)
(Ho1−yREy)Cu2−x Al x (4)
〔式中、xは0<x≦1を示す。yは0<y<1を示す。REは希土類元素(但しHoを除く)を示す。〕
で表され、
KHg2型構造(体心直方晶、ピアソン記号:oI12)の結晶構造を主相とし、更に第二相としてHoCuAl相を有し、10K以上の温度領域においてHoCu2よりも高い比熱を有する、
ことを特徴とするHoCu系蓄冷材。 - 請求項1又は2に記載のHoCu系蓄冷材が単独で又は他の蓄冷材と組み合わせて充填されている蓄冷器。
- 前記HoCu系蓄冷材は、1)球状粉の粒子群の状態、又は2)球状粉の粒子群の焼結体の状態である、請求項3に記載の蓄冷器。
- 請求項3又は4に記載の蓄冷器を備えた冷凍機。
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WO2022224783A1 (ja) * | 2021-04-20 | 2022-10-27 | 株式会社 東芝 | 磁性蓄冷材粒子、蓄冷器、冷凍機、クライオポンプ、超電導磁石、核磁気共鳴イメージング装置、核磁気共鳴装置、磁界印加式単結晶引上げ装置、及び、ヘリウム再凝縮装置 |
CN113265552A (zh) * | 2021-04-30 | 2021-08-17 | 福建省长汀金龙稀土有限公司 | 一种磁制冷用稀土钬铜合金的制备方法 |
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JPWO2018199278A1 (ja) | 2019-06-27 |
US20210108121A1 (en) | 2021-04-15 |
US11370949B2 (en) | 2022-06-28 |
CN110546234A (zh) | 2019-12-06 |
EP3617288A4 (en) | 2020-12-09 |
EP3617288A1 (en) | 2020-03-04 |
WO2018199278A1 (ja) | 2018-11-01 |
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