JPWO2018025581A1 - 希土類オキシ硫化物蓄冷材 - Google Patents
希土類オキシ硫化物蓄冷材 Download PDFInfo
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Abstract
Description
Gd2O2S+Al2O3→Gd2O2S+GdAlO3+Al2O3 (1)
この場合、添加するAl2O3の比表面積が大きくなるほど、Gd2O2Sとの反応性は増すので、反応後に存在するAl2O3の量が少なくなる。そのため、強化材料としてのAl2O3の効果が低くなる。そこで、R2O2Sに添加するAl2O3の比表面積は11m2/g以下であることが好ましい。
フィッシャー法によって測定した平均粒径が0.46μmの酸化ガドリニウムGd2O3(比表面積:4.2m2/g)10gを石英ボートに充填し、石英反応管に硫化水素ガス H2Sを0.2L/minの流量で流しながら、650℃で4時間反応させた。反応生成物をX線回折で測定したところ、ガドリニウムオキシ硫化物Gd2O2Sのピークしか認められず、希土類酸化物に対する反応収率は100%であった。得られたGd2O2S粉体を30MPaで12mm直径の円盤状に成形し、成形体を200MPa圧力下で静水圧プレスした後、アルゴン雰囲気下1500℃で6時間常圧焼結した。なお昇温速度は200℃/hとした。
d= 1.56C/(MN)
(d:平均粒径、C:SEM等の高分解能画像で任意に引いた線の長さ、N:任意に引いた線上の結晶粒の数、M:画像の倍率)
試験例1で使用した酸化ガドリニウムと、JIS Z 8830:2013に準拠したN2によるBET一点吸着法で測定した比表面積が0.1〜14m2/gのアルミナをボールミルに入れ、エタノールを溶媒として24時間混合した。得られたスラリーを乾燥し、仮焼(900℃×3時間)した。生成物を硫化水素ガスと反応させ、試験例1と同様にして(30MPaで12mm直径の円盤状に成形し、成形体を200MPa圧力下で静水圧プレス後、アルゴン雰囲気下1500℃で6時間常圧焼結)、Alを含むGd2O2Sセラミックス(Al-doped Gd2O2S)を作製した。得られたAl-doped Gd2O2Sの密度はアルキメデス法により理論密度の99.9%であった。このようにして作製したAl-doped Gd2O2Sに含まれるGd2O2S、GdAlO3およびAl2O3の組成比を求めるために、研削・研磨後の試料についてX線回折法によって、回折角(2θ)におけるX線強度を求めた。主成分であるGd2O2Sの回折角(2θ)=29.909°におけるX線強度を100とした場合、そのGd2O2SのX線強度に対するGdAlO3の回折角(2θ)=33.989°におけるX線強度の比率(X線強度比(%))と、上記Gd2O2SのX線強度に対するAl2O3の回折角(2θ)=35.152°におけるX線強度の比率(X線強度比(%))とを以下の表1〜表5に示す。なお、Gd2O2Sに対するアルミナの添加量は、アルミニウム換算で、3重量%と5重量%と7重量%と10重量%と12重量%の5例を実施したので、表1にはアルミナの添加量がアルミニウム換算で3重量%の場合を示し、表2にはアルミナの添加量がアルミニウム換算で5重量%の場合を示し、表3にはアルミナの添加量がアルミニウム換算で7重量%の場合を示し、表4にはアルミナの添加量がアルミニウム換算で10重量%の場合を示し、表5にはアルミナの添加量がアルミニウム換算で12重量%の場合を示す。
実施例1で示したAl-doped Gd2O2S粉体(硫化後で焼成前)を転動造粒法により、球状に成形し、得られた顆粒を異なる2種類のフィルターネット(Aメッシュ(目開き597μm)とBメッシュ(目開き435μm))によって篩分けをした。篩分けた顆粒を約25°に傾けた鉄板(鏡面に研磨したもの)上に転がし、転がり落ちた顆粒を回収して形状分球を実施した。顆粒100個の平均粒径は0.5mmであった。尚、Al-doped Gd2O2S顆粒の平均粒径は、ビデオハイスコープシステムを用いて撮影した画像から測定した。
Claims (3)
- 一般式R2O2S(RはYを含むLa, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb及びLuから選択される1種類又は2種類以上の希土類元素を表す。) で表される希土類オキシ硫化物セラミックスを用いた蓄冷材であって、該希土類オキシ硫化物蓄冷材に、Al2O3を、アルミニウム換算で3〜12重量%添加したことを特徴とする希土類オキシ硫化物蓄冷材。
- Al2O3の比表面積は、0.3m2/g以上11m2/g以下であることを特徴とする請求項1に記載の希土類オキシ硫化物蓄冷材。
- 請求項1または2に記載の希土類オキシ硫化物蓄冷材を充填してなる蓄冷器。
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JP2016155082 | 2016-08-05 | ||
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PCT/JP2017/024919 WO2018025581A1 (ja) | 2016-08-05 | 2017-07-07 | 希土類オキシ硫化物蓄冷材 |
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JP7321732B2 (ja) | 2019-03-18 | 2023-08-07 | 株式会社東芝 | 蓄冷材粒子、蓄冷器、冷凍機、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、クライオポンプ、及び、磁界印加式単結晶引上げ装置 |
WO2022039150A1 (ja) | 2020-08-18 | 2022-02-24 | 株式会社 東芝 | 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、蓄冷材粒子の製造方法 |
EP4253868A1 (en) | 2020-11-26 | 2023-10-04 | Kabushiki Kaisha Toshiba | Cold storage material, cold storage material particles, granular particles, cold storage device, refrigerating machine, cryopump, superconducting magnet, nuclear magnetic resonance imaging apparatus, nuclear magnetic resonance apparatus, magnetic-field-application-type single crystal pulling apparatus, and helium re-condensation apparatus |
WO2023032867A1 (ja) | 2021-08-30 | 2023-03-09 | 株式会社 東芝 | 蓄冷材粒子用造粒粒子、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 |
WO2023145730A1 (ja) * | 2022-01-28 | 2023-08-03 | 株式会社 東芝 | 蓄冷材、蓄冷材粒子、造粒粒子、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、ヘリウム再凝縮装置、及び、希釈冷凍機 |
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- 2017-07-07 US US16/311,429 patent/US20200248058A1/en not_active Abandoned
- 2017-07-07 CN CN201780028787.4A patent/CN109312215B/zh active Active
- 2017-07-07 WO PCT/JP2017/024919 patent/WO2018025581A1/ja unknown
- 2017-07-07 EP EP17836688.6A patent/EP3495445B1/en active Active
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2022
- 2022-01-11 US US17/573,218 patent/US20220135419A1/en active Pending
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US20220135419A1 (en) | 2022-05-05 |
US20200248058A1 (en) | 2020-08-06 |
CN109312215B (zh) | 2021-03-26 |
JP6898328B2 (ja) | 2021-07-07 |
CN109312215A (zh) | 2019-02-05 |
WO2018025581A1 (ja) | 2018-02-08 |
EP3495445B1 (en) | 2023-11-15 |
EP3495445A1 (en) | 2019-06-12 |
EP3495445A4 (en) | 2020-01-29 |
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