JPWO2016140350A1 - 磁気冷凍モジュールの製造方法 - Google Patents
磁気冷凍モジュールの製造方法 Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 title claims description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000000843 powder Substances 0.000 claims abstract description 80
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 70
- 239000000956 alloy Substances 0.000 claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 claims abstract description 43
- 239000011812 mixed powder Substances 0.000 claims abstract description 29
- 238000002844 melting Methods 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 27
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 239000013078 crystal Substances 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001257 hydrogen Substances 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 67
- 238000005245 sintering Methods 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 238000009694 cold isostatic pressing Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 27
- 239000000203 mixture Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 13
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- 238000002156 mixing Methods 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000010298 pulverizing process Methods 0.000 description 7
- 239000010949 copper Substances 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910001128 Sn alloy Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
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- 239000000696 magnetic material Substances 0.000 description 3
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- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
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- 229910052796 boron Inorganic materials 0.000 description 2
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 241000238366 Cephalopoda Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
NaZn13型結晶構造を主相とするLa(Fe、Si)13系合金粉末と、融点が1,090℃以下の金属及び/又は合金からなるM粉末とを含む混合粉末Aを準備する工程(1)と、
前記混合粉末Aを、還元雰囲気中で、前記M粉末の融点近傍で焼結処理し、焼結体Bを得る工程(2)と、
前記焼結体Bを、水素含有雰囲気中で水素化処理する工程(3)と、を含む磁気冷凍モジュールの製造方法(以下、本発明の方法と略すことがある)が提供される。
本発明の方法は、NaZn13型結晶構造を主相とするLa(Fe、Si)13系合金(以下、単にLa(Fe、Si)13系合金と称する場合がある)を含む磁気冷凍モジュールの製造方法に用いることが可能であり、主に下記の工程(1)〜(3)を含むことを特徴とする磁気冷凍モジュールの製造方法である。
RCP=−ΔSmax×δT
但し、−ΔSmaxは−ΔSMの最大値を示し、δTは−ΔSMのピークの半値幅を示す。ここで半値幅とは、磁気エントロピー変化量(−ΔSM)における温度曲線での磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)の半分の値における半値半幅、即ち、最大値をピークとした山形曲線の広がりの程度を示す指標を意味する。
表1に示す組成のLa(Fe、Si)13系合金粉末を得るために、原料を秤量し、高周波溶解炉にてアルゴンガス雰囲気中で溶解し、合金溶融物とした。続いて、この溶融物の注湯温度を1,550℃として、銅製水冷ロール鋳造装置を用いてストリップキャスト法にて急冷・凝固して合金鋳片を得た。得られた合金鋳片の組成をICP(Inductively Coupled Plasma)発光分光分析で分析したところLa(Fe0.885Si0.11Mn0.005)13であった。得られた合金鋳片をアルゴンガス雰囲気中で、1,080℃、20時間保持する均質化熱処理を行い、その後急冷処理を行い、NaZn13型結晶構造を主相とする合金鋳片を得た。その後、鋳片を窒素ガス雰囲気中でディスクミル粉砕を行い、平均粒径(D50)が78μmのLa(Fe、Si)13系合金粉末を得た。
La(Fe、Si)13系合金粉末の組成、M粉末の組成、La(Fe、Si)13系合金粉末とM粉末との混合比率、M粉末の融点、焼結処理の温度および時間を表1に示すように変更した以外は実施例1と同様にして焼結体Bを得た。実施例1と同様に測定した密度、磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)、材料強度、キュリー温度及びRCPの結果を表2に示す。
La(Fe、Si)13系合金粉末:Al粉末=92:8の混合比率とし、この混合粉末を、有機系バインダーとしてポリビニルアルコール(PVA)と混合して混合粉末Aとした後、押出成形を行った。次に条件が250℃、1時間で脱バインダー処理を行い、成形体を得た以外は実施例1と同様にして焼結体Bを得た。実施例1と同様に測定した密度、磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)、材料強度、キュリー温度及びRCPの結果を表2に示す。
La(Fe、Si)13系合金粉末の組成、M粉末の組成、La(Fe、Si)13系合金粉末とM粉末の混合比率、M粉末の融点、焼結処理の温度および時間を表1に示すように変更した以外は実施例1と同様にして焼結体Bを得た。実施例1と同様に測定した密度、磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)、材料強度、キュリー温度及びRCPの結果を表2に示す。
実施例6と同じ組成を有するLa(Fe、Si)13系合金粉末を実施例1と同様に得て、実施例1と同様に水素化処理した後、その表面に電解Sn鍍金を施した。このとき鍍金されたSnはLa(Fe、Si)13系合金粉末重量に対して8wt%である。またSn鍍金後の粒子断面をSEM観察したところ、均一にSn鍍金されていることを確認し、平均Sn鍍金厚は1μmであった。このSn鍍金La(Fe、Si)13系合金粉末を実施例1と同様の方法により成形体を得て、アルゴンガス雰囲気中で210℃、5時間の条件で焼結処理を行い、焼結体を得た。さらに実施例1と同様に測定した磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)、材料強度、キュリー温度及びRCPの結果を表2に示す。
実施例1と同じ組成を有するLa(Fe、Si)13系合金粉末を用いて、放電プラズマ焼結法(SPS)により実施例1と同形状の焼結体を得た。このときの条件は、面圧40MPa、焼結温度は1,110℃とした。この焼結体を用いて実施例1と同様に測定した磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)、材料強度、キュリー温度及びRCPの結果を表2に示す。
RCP=−ΔSmax×δT
但し、−ΔSmaxは−ΔSMの最大値を示し、δTは−ΔSMのピークの半値幅を示す。ここで半値幅とは、磁気エントロピー変化量(−ΔSM)における温度曲線での磁気エントロピー変化量(−ΔSM)の最大値(−ΔSmax)の半分の値における半値全幅、即ち、最大値をピークとした山形曲線の広がりの程度を示す指標を意味する。
Claims (8)
- NaZn13型結晶構造を主相とするLa(Fe、Si)13系合金粉末と、融点が1,090℃以下の金属及び/又は合金からなるM粉末とを含む混合粉末Aを準備する工程(1)と、
前記混合粉末Aを、還元雰囲気中で、前記M粉末の融点近傍で焼結処理し、焼結体Bを得る工程(2)と、
前記焼結体Bを、水素含有雰囲気中で水素化処理する工程(3)と、
を含むことを特徴とする磁気冷凍モジュールの製造方法。 - 工程(2)において、前記焼結処理を行う前に、混合粉末Aを成形して成形体を得る工程を有することを特徴とする請求項1に記載の磁気冷凍モジュールの製造方法。
- 工程(2)において、混合粉末Aを成形する方法が、金型、CIP、射出、押出、圧縮のいずれかの方法により行われることを特徴とする請求項2に記載の磁気冷凍モジュールの製造方法。
- 工程(2)において、前記焼結処理が、雰囲気炉、ホットプレス、HIPのいずれかの方法により行われることを特徴とする請求項1〜3のいずれか一項に記載の磁気冷凍モジュールの製造方法。
- 前記混合粉末Aが、有機系バインダーを含むことを特徴とする請求項1〜4のいずれか一項に記載の磁気冷凍モジュールの製造方法。
- 工程(1)において、工程(2)の焼結処理の前に、脱バインダー処理を行うことを特徴とする請求項5に記載の磁気冷凍モジュールの製造方法。
- 融点が1,090℃以下の金属及び/又は合金からなるM粉末は、Cu、Ag、Zn、Al、Ge、Sn、Sb、Pb、Ba、Bi、Ga及びInからなる群より選択される少なくとも一種の金属及び/又は少なくとも一種の元素を含有する合金であることを特徴とする請求項1〜6のいずれか一項に記載の磁気冷凍モジュールの製造方法。
- 請求項1〜7のいずれか一項に記載の製造方法により得られた磁気冷凍モジュール。
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US11289248B2 (en) * | 2018-03-05 | 2022-03-29 | Iowa State University Research Foundation, Inc. | Modified La—Fe—Si magnetocaloric alloys |
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