JPH0697625B2 - Method of joining electrode terminals to oxide superconductor - Google Patents
Method of joining electrode terminals to oxide superconductorInfo
- Publication number
- JPH0697625B2 JPH0697625B2 JP62187592A JP18759287A JPH0697625B2 JP H0697625 B2 JPH0697625 B2 JP H0697625B2 JP 62187592 A JP62187592 A JP 62187592A JP 18759287 A JP18759287 A JP 18759287A JP H0697625 B2 JPH0697625 B2 JP H0697625B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- joining
- electrode terminal
- electrode terminals
- silver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 22
- 239000002887 superconductor Substances 0.000 title claims description 19
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 14
- 229910052709 silver Inorganic materials 0.000 claims description 12
- 239000004332 silver Substances 0.000 claims description 12
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000010931 gold Substances 0.000 claims description 5
- 229910052763 palladium Inorganic materials 0.000 claims description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000007788 liquid Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、酸化物超電導体への金属電極端子の接合方法
に関する。TECHNICAL FIELD The present invention relates to a method for joining a metal electrode terminal to an oxide superconductor.
従来、酸化物超電導体への金属電極端子の接合方法につ
いては、ジヤパニーズ・ジヤーナル・オブ・アプライド
・フイジツクス,4,26（1987年）第311頁から第313頁，
第320項から第321項、及び第327項から328項に論じられ
ているように、金蒸着あるいはインジウムはんだによる
接合，またはAgペーストの自然乾燥による方法が知られ
ていた。Conventionally, regarding the method of joining a metal electrode terminal to an oxide superconductor, Japanese Journal of Applied Physics, 4, 26 (1987), pages 311 to 313,
As discussed in paragraphs 320 to 321, and 327 to 328, methods by vapor deposition or bonding with indium solder or natural drying of Ag paste have been known.
上記従来技術では、酸化物超電導体の電気抵抗測定に必
要な水準の電流値である〜100A/cm2以下の電流の通電は
可能であつたが、103A/cm2以上の電流を必要とする場合
には電極接合面が発熱して超電導状態が破れてしまうと
いう問題があつた。In the above prior art, it was possible to carry a current of ~ 100 A / cm 2 or less, which is a current value at a level necessary for measuring the electric resistance of an oxide superconductor, but a current of 10 3 A / cm 2 or more is required. In that case, there is a problem that the electrode joint surface generates heat and the superconducting state is broken.
本発明の目的は、103A/cm2以上の電流を容易に流し得る
酸化物超電導体への電極端子の接合方法を提供するにあ
る。An object of the present invention is to provide a method for joining an electrode terminal to an oxide superconductor which can easily pass a current of 10 3 A / cm 2 or more.
〔問題点を解決するための手段〕 上記目的は、酸化物超電導体表面に、銀，金，白金，パ
ラジウム、またはこれらの合金から成る金属電極端子を
設け、上記金属と酸化物超電導体接合界面に銀，金，パ
ラジウムまたはこれらの合金から成るペーストまたは粉
末を塗布し、950℃以下、好ましくは300〜900℃の酸素
雰囲気中で加熱処理することにより、金属電極端子と酸
化物超電導体を強固に接合せしめることで達成される。[Means for Solving the Problems] The above object is to provide a metal electrode terminal made of silver, gold, platinum, palladium, or an alloy thereof on the surface of an oxide superconductor, and to bond the metal to the oxide superconductor interface. The paste or powder consisting of silver, gold, palladium or an alloy of these is applied to and heat-treated in an oxygen atmosphere at 950 ° C or lower, preferably 300 to 900 ° C to strengthen the metal electrode terminals and oxide superconductor. It is achieved by joining to.
銀，金，パラジウムまたはこれらの合金からなるペース
ト又は粉末は、酸素雰囲気中においても酸化されること
なく金属状態を保ち得る。また、電極となる金属と容易
に熱拡散により接合される。一方、酸化物超電導体表面
の微細な表面欠陥から、超電導体の表面に侵入して強固
な接合を行う。このため、他の接合方法に比して著しく
界面抵抗が減少するとともに、機械的強停の強い電極端
子を得ることができる。The paste or powder made of silver, gold, palladium or an alloy thereof can maintain a metallic state without being oxidized even in an oxygen atmosphere. Further, it is easily bonded to the metal to be the electrode by thermal diffusion. On the other hand, a fine surface defect on the surface of the oxide superconductor penetrates into the surface of the superconductor to make a strong bond. Therefore, the interface resistance is significantly reduced as compared with other joining methods, and an electrode terminal having a strong mechanical failure can be obtained.
酸化物超電導体としてはY1Ba2Cu7-δを用いた。以下そ
の焼結体の製造方法について示す。Y 1 Ba 2 Cu 7- δ was used as the oxide superconductor. The manufacturing method of the sintered body will be described below.
まず、純度99.9％のY2O3，BaCO3,CuOを、ＹとBaとCuの
比が1:2:3となるように秤量した。これらの粉末をめの
う乳鉢で混合後、混心ボールミルで１時間さらに混合し
た。この混合粉末を950℃で10時間，酸素気流中で焼成
した。この焼成粉をさらにめのう乳鉢で１時間粉枠，混
合した後、成型圧力400kg/cm2で外径φ30、厚さ2mmの円
板状にプレスした。この成型体を、950℃で10時間、酸
素気流中で焼結して所望の酸化物超電導体を得た。First, Y 2 O 3 , BaCO 3 , and CuO having a purity of 99.9% were weighed so that the ratio of Y, Ba, and Cu was 1: 2: 3. These powders were mixed in an agate mortar and then further mixed for 1 hour in a mixed ball mill. The mixed powder was fired at 950 ° C for 10 hours in an oxygen stream. The calcined powder was further mixed in a powder mortar for 1 hour in an agate mortar, and then pressed at a molding pressure of 400 kg / cm 2 into a disk shape having an outer diameter of φ30 and a thickness of 2 mm. The molded body was sintered at 950 ° C. for 10 hours in an oxygen stream to obtain a desired oxide superconductor.
本実施例では、この焼成体を2mm角、長さ25mm、ダイヤ
モンドカツターにより切り出し以下に示す本発明の方法
により金属電極を接合した。In this example, the fired body was cut out with a 2 mm square, a length of 25 mm, and a diamond cutter, and metal electrodes were bonded by the method of the present invention described below.
第１図は本発明の電極端子接合方法を示す。所定の形状
に切り出した超電導体１の長手方向の両端からそれぞれ
3mmづつ銀ペースト（Ｐ−255）２を塗布し電流端子とし
た（ｂ）。さらに中央部に10mmの間隔で電圧端子を幅1m
m設けた。次に銀ペースト付着部にφ0.1mmの銀線３を巻
きつけた（ｃ）。さらに、この銀線の上から銀ペースト
を十分塗り、乾燥させた後（ｄ）、熱処理（ｅ）を行つ
た。熱処理条件は酸素気流中900℃,5時間で、熱処理
後、電気炉内で室温まで炉去後、φ0.5mmの銅線を電極
端子部分にはんだ付けした。FIG. 1 shows an electrode terminal joining method of the present invention. From both ends in the longitudinal direction of the superconductor 1 cut out in a predetermined shape
Silver paste (P-255) 2 was applied every 3 mm to make a current terminal (b). In addition, voltage terminals with a width of 1 m at intervals of 10 mm in the center
m provided. Next, a silver wire 3 having a diameter of 0.1 mm was wound around the silver paste adhered portion (c). Further, a silver paste was sufficiently coated on the silver wire and dried (d), followed by heat treatment (e). The heat treatment conditions were 900 ° C. in an oxygen stream for 5 hours, and after the heat treatment, the furnace wire was removed to room temperature in an electric furnace, and a copper wire of φ0.5 mm was soldered to the electrode terminal portion.
比較のために、以下の方法を用いた。The following method was used for comparison.
a.銀ペースト塗布→熱処理（500℃×５時間）酸素気流
中 b.銀ペースト塗布→乾燥のみ c.インジウムはんだによる接合 ａの方法では、600℃以上の高温では銀ペーストが熱拡
散により凝集するため500℃以下で熱処理する必要があ
つた。さらに、はんだ付けの際に電極がはく離してしま
つた。a. Applying silver paste → heat treatment (500 ° C x 5 hours) in an oxygen stream b. Applying silver paste → drying only c. Joining with indium solder In method a, the silver paste aggregates due to thermal diffusion at temperatures above 600 ° C. Therefore, it was necessary to perform heat treatment at 500 ° C or lower. Furthermore, the electrodes peeled off during soldering.
ｂの方法では、はんだ付けを行うことは全くできず、φ
0.2mmの銅線を直接巻きつけ、その上から銀ペーストを
塗布して電極とした。With method b, soldering cannot be performed at all, and φ
A 0.2 mm copper wire was directly wound and a silver paste was applied onto the copper wire to form an electrode.
ｃの方法は、本発明と同様に強固な接合を得ることがで
きた。The method of c could obtain a strong joint as in the present invention.
第２図は、以上の電極端子の接合方法の違いによる電流
一電圧特性の違いを液体窒素温度において比較したもの
である。なお、比較方法ａは、一方の電流端子の接合が
できなかつたので除外した。b,cの方法は、いずれも液
体窒素中で電極部分が発熱して沸騰現象が起こることを
肉眼で確認した。本発明による電極接合方法では、電極
周辺部での液体窒素の沸騰現象は見られず、約4,000A/c
m2で酸化物超電導体が完全な常電導状態に転移して赤熱
後、溶断したが、電極部分に変化はなかつた。FIG. 2 compares the difference in current-voltage characteristics due to the difference in the method of joining the electrode terminals described above at the liquid nitrogen temperature. The comparison method a was excluded because one current terminal could not be joined. In both methods b and c, it was visually confirmed that the electrode part generated heat in liquid nitrogen and a boiling phenomenon occurred. In the electrode bonding method according to the present invention, the boiling phenomenon of liquid nitrogen in the electrode peripheral portion is not seen, about 4,000A / c
At m 2 , the oxide superconductor transitioned to the complete normal conduction state, red-hot, and then melted, but there was no change in the electrode part.
本発明により、液体窒素温度以上の高い超電導転移温度
を有する酸化物超電導体へ、実用必要な1,000A/cm2以上
の電流密度を容易に流し得ることが可能となつた。According to the present invention, it becomes possible to easily pass a practically required current density of 1,000 A / cm 2 or more to an oxide superconductor having a high superconducting transition temperature of liquid nitrogen temperature or higher.
第１図は本発明の酸化物超電導体への電極端子接合方法
を示す工程図、第２図は本発明と従来の電極接合方法に
よる電流一電圧特性の違いを示す線図である。FIG. 1 is a process diagram showing a method of joining electrode terminals to an oxide superconductor according to the present invention, and FIG. 2 is a diagram showing a difference in current-voltage characteristics between the present invention and a conventional electrode joining method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 矢内 吉美 茨城県日立市久慈町4026番地 株式会社日 立製作所日立研究所内 (72)発明者 佐藤 宏 茨城県日立市久慈町4026番地 株式会社日 立製作所日立研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshimi Yauchi 4026 Kuji Town, Hitachi City, Hitachi, Ibaraki Prefecture Hiritsu Manufacturing Co., Ltd.Hitachi Research Laboratories (72) Inventor Hiroshi Sato 4026 Kuji Town, Hitachi City, Hitachi Ibaraki Co., Ltd. Hitachi Research Laboratory
Claims (1)
合する方法において、金属電極端子は、銀，金，白金，
パラジウム，又はこれらの合金からなり、前記金属電極
端子と酸化物超電導体の接合面に、銀，金，パラジウム
またはこれらの合金から成るペーストまたは粉末を塗布
し、950℃以下の酸素雰囲気中で熱処理を施すことを特
徴とする酸化物超電導体への電極端子接合方法。1. A method of joining a metal electrode terminal to a surface of an oxide superconductor, the metal electrode terminal comprising silver, gold, platinum,
A paste or powder made of palladium or an alloy of these, which is made of silver, gold, palladium, or an alloy thereof, is applied to the joint surface between the metal electrode terminal and the oxide superconductor, and heat treatment is performed in an oxygen atmosphere at 950 ° C or less. A method for joining an electrode terminal to an oxide superconductor, the method comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62187592A JPH0697625B2 (en) | 1987-07-29 | 1987-07-29 | Method of joining electrode terminals to oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62187592A JPH0697625B2 (en) | 1987-07-29 | 1987-07-29 | Method of joining electrode terminals to oxide superconductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6433870A JPS6433870A (en) | 1989-02-03 |
| JPH0697625B2 true JPH0697625B2 (en) | 1994-11-30 |
Family
ID=16208806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62187592A Expired - Lifetime JPH0697625B2 (en) | 1987-07-29 | 1987-07-29 | Method of joining electrode terminals to oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0697625B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2889595B2 (en) * | 1989-07-10 | 1999-05-10 | 三洋電機株式会社 | Method for forming electrode of oxide superconductor film |
| JPH0779045B2 (en) * | 1991-02-07 | 1995-08-23 | 三井金属鉱業株式会社 | Oxide superconducting current lead |
| US5296459A (en) * | 1992-06-19 | 1994-03-22 | Trustees Of Boston University | Method for making an electrically conductive contact for joining high T.sub. |
-
1987
- 1987-07-29 JP JP62187592A patent/JPH0697625B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6433870A (en) | 1989-02-03 |
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