JP2008210600A - 希土類系テープ状酸化物超電導体及びそれに用いる複合基板 - Google Patents
希土類系テープ状酸化物超電導体及びそれに用いる複合基板 Download PDFInfo
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Abstract
【解決手段】2軸配向させたNi―W合金テープ状基板1の表面に、MOD法により複数回の塗布および仮焼を繰り返して成膜した5nm以下の表面平滑性を有するA2Zr2O7からなる第1中間層2、パルス蒸着法により成膜したCeO2膜からなる第2中間層3、MOD法により形成されたYBCO超電導層4およびこのYBCO超電導層の上にAg安定化層5を成膜して1MA/cm2以上の臨界電流密度(Jc)を有するYBCO超電導体10を製造する。
【選択図】図1
Description
図3に示すように、無配向で非磁性の厚さ100μmtのハステロイテープ100の表面10に、無配向で非磁性の厚さ30μmtのNi―9at%W合金テープ11と、ハステロイテープ100の表面20に無配向で非磁性の厚さ60μmtのNi―9at%W合金テープ21を表面活性化接合プロセスにより接着した後、テープ11の表面に厚さ30μmtのNi―3at%W合金テープ12を表面活性化接合プロセスにより接着した。
実施例と同様に、無配向で非磁性の厚さ100μmtのハステロイテープ100の表面10に、無配向で非磁性の厚さ30μmtのNi―9at%W合金テープ11と、ハステロイテープ100の表面20に無配向で非磁性の厚さ60μmtのNi―9at%W合金テープ21を表面活性化接合プロセスにより接着した後、テープ11の表面に厚さ30μmtのNi―3at%W合金テープ12を表面活性化接合プロセスにより接着した。
送電ケーブルや電力貯蔵システムのような電力機器及びモーターなどの動力機器への使用に適した酸化物超電導体への利用が可能である。
2 中間層
3 酸化物超電導層
1a 金属基板
5a 第1の金属層
5b 第2の金属層
4a 第1の接合層
4b 第2の接合層
4a―1、4a―2、4a―3 接合層
5a―1、5a―2、5a―3、5a―4 金属層
6 立方体集合組織
11、21 Ni―9at%W合金テープ
12 Ni―3at%W合金テープ
13 (Ce,Gd)O2中間層
14 Ce2Zr2O7中間層
15 CeO2中間層
16 YBCO超電導膜
17 銀安定化層
50a、50b、50c 接合層
100 ハステロイテープ
101 複合テープ
Claims (14)
- 複合基板上に、2軸配向した無機材料からなる中間層を1層または複数層形成し、この上に酸化物超電導層を設けた酸化物超電導体において、前記複合基板は、無配向で非磁性の金属で形成されたコア材となる金属基板と、この金属基板の両面にそれぞれ常温接合後の熱処理あるいは熱間圧延加工を施すことにより形成された第1の接合層、第2の接合層を介して配置された第1の金属層及び第2の金属層とからなり、少なくとも前記第1の金属層の前記中間層側の表面は2軸配向した立方体集合組織を有するとともに、前記金属基板に前記第1の金属層及び前記第2の金属層の機械的強度よりも大きい機械的強度を有する材料を用いたことを特徴とする希土類系テープ状酸化物超電導体。
- 第1の金属層及び第2の金属層は、複合基板の変形を防止し、少なくとも第1の金属層は金属基板からの元素の拡散を防止する機能を有することを特徴とする請求項1記載の希土類系テープ状酸化物超電導体。
- 中間層側の第1の金属層は、相互に接合された複数層からなり、少なくとも中間層側の表面に2軸配向した立方体集合組織を有することを特徴とする請求項1又は2記載の希土類系テープ状酸化物超電導体。
- 金属基板は、ニッケル基合金又はステンレスからなることを特徴とする請求項1乃至3いずれか1項記載の希土類系テープ状酸化物超電導体。
- 金属基板は、ニッケルに、タングステン、モリブデン、クロム、鉄、コバルト、バナジウム、マンガンから選択された一種類以上の添加元素を含むニッケル基合金からなることを特徴とする請求項4記載の希土類系テープ状酸化物超電導体。
- 第1の金属層及び第2の金属層は、ニッケルに、タングステン、モリブデン、クロム、鉄、コバルト、バナジウム、マンガン、銅、銀から選択された一種類以上の添加元素を含むニッケル基合金からなることを特徴とする請求項1乃至5いずれか1項記載の希土類系テープ状酸化物超電導体。
- 複数層の中間層側の第1の金属層は、ニッケルに、タングステン、モリブデン、クロム、鉄、コバルト、バナジウム、マンガン、銅、銀から選択された一種類以上の添加元素を含むニッケル基合金からなり、各層のニッケル基合金ヘの合金元素の添加量が第1の接合層から中間層2側へ向って順次減少することを特徴とする請求項3記載の希土類系テープ状酸化物超電導体。
- ニッケル基合金中の合金元素の添加量は、少なくとも第1の接合層に接する層においてはニッケル基系合金の磁性が消失する範囲内で、また少なくとも中間層に接する層においてはニッケル基系合金の立方体集合組織が形成容易な範囲内で添加されることを特徴とする請求項7記載の希土類系テープ状酸化物超電導体。
- ニッケル基系合金ヘの合金元素の添加量は、少なくとも第1の接合層に接する層において8at%を超える範囲で、また少なくとも中間層に接する層において6at%未満の範囲であることを特徴とする請求項8記載の希土類系テープ状酸化物超電導体。
- 希土類系テープ状酸化物超電導体用の複合基板であって、前記複合基板は、無配向で非磁性の金属で形成されたコア材となる金属基板と、この金属基板の両面にそれぞれ常温接合後の熱処理あるいは熱間圧延加工を施すことにより形成された第1の接合層、第2の接合層を介して配置された第1の金属層及び第2の金属層とからなり、前記第1の金属層又は第2の金属層の少なくとも一方の表面は2軸配向した立方体集合組織を有するとともに、前記金属基板に前記第1の金属層及び第2の金属層の機械的強度よりも大きい機械的強度を有する材料を用いたことを特徴とする希土類系テープ状酸化物超電導体用複合基板。
- 希土類系テープ状酸化物超電導体用の複合基板であって、前記複合基板は、無配向で非磁性の金属で形成されたコア材となる金属基板と、この金属基板の両面にそれぞれ常温接合後の熱処理あるいは熱間圧延加工を施すことにより形成された第1の接合層、第2の接合層を介して配置され、複合基板の変形を防止する機能を有する第1の金属層及び第2の金属層とからなり、前記第1の金属層は金属基板からの元素の拡散を防止する機能を有する複数層により形成され、少なくともその表面は2軸配向した立方体集合組織6を有するとともに、前記金属基板に前記第1の金属層及び第2の金属層の機械的強度よりも大きい機械的強度を有する材料を用いたことを特徴とする希土類系テープ状酸化物超電導体用複合基板。
- 金属基板、第1の金属層及び第2の金属層は、ニッケル基合金からなることを特徴とする請求項10又は11記載の希土類系テープ状酸化物超電導体用複合基板。
- 第1の金属層の複数層は、第1の接合層に接する層から最外層へ向かって合金元素の添加量が順次減少するニッケル基合金により形成したことを特徴とする請求項11又は12記載の希土類系テープ状酸化物超電導体用複合基板。
- ニッケル基系合金ヘの合金元素の添加量は、少なくとも第1の接合層に接する層において9at%を超える範囲で、また少なくとも最外層において6at%未満の範囲であることを特徴とする請求項13記載の希土類系テープ状酸化物超電導体用複合基板。
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