JP2644432B2 - Hot extrusion method of superconducting composite billet - Google Patents
Hot extrusion method of superconducting composite billetInfo
- Publication number
- JP2644432B2 JP2644432B2 JP5273097A JP27309793A JP2644432B2 JP 2644432 B2 JP2644432 B2 JP 2644432B2 JP 5273097 A JP5273097 A JP 5273097A JP 27309793 A JP27309793 A JP 27309793A JP 2644432 B2 JP2644432 B2 JP 2644432B2
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- composite billet
- hot extrusion
- superconducting composite
- extrusion method
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高品質の押出材が得ら
れる超電導複合ビレットの熱間押出方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for hot extrusion of a superconducting composite billet from which a high-quality extruded material can be obtained.
【０００２】[0002]
【従来の技術】超電導線は、フラックスフローに伴う急
激な温度上昇（クエンチ）を防止する為に、ＮｂＴｉ合
金フィラメントやＮｂ3 Ｓｎ金属間化合物フィラメント
等の超電導体を銅等の熱伝導性に優れた金属材料で複合
して用いられている。このような構造の超電導線は、Ｎ
ｂＴｉ合金等の超電導金属棒材を金属製パイプ内に充填
して複合ビレットとなし、これに熱間押出と伸線加工を
施して製造されていた。前記超電導線はその多数本を再
び銅製パイプに充填して複合ビレットとなし、これを前
述と同様に加工して多芯超電導線が製造されていた。BACKGROUND ART superconducting wire, in order to prevent the rapid increase in temperature (quench) due to the flux flow, high thermal conductivity such as copper and NbTi alloy filaments and Nb 3 Sn intermetallic compound filaments such superconductors It is used in combination with a metal material. A superconducting wire having such a structure has N
A superconducting metal rod such as a bTi alloy is filled in a metal pipe to form a composite billet, which is subjected to hot extrusion and wire drawing. Many of the superconducting wires were again filled into a copper pipe to form a composite billet, which was processed in the same manner as described above to produce a multi-core superconducting wire.
【０００３】[0003]
【発明が解決しようとする課題】このような超電導複合
ビレットから熱間押出と伸線加工により製造した超電導
線は、伸線加工中に断線したり、内部の超電導フィラメ
ントが多数断線してＪｃが低下したり、表面品質が悪い
為ホルマール被覆時に所定の絶縁特性が得られないとい
う問題があった。The superconducting wire manufactured from such a superconducting composite billet by hot extrusion and wire drawing is broken during wire drawing or a large number of internal superconducting filaments are broken and Jc is reduced. There has been a problem that a predetermined insulating property cannot be obtained at the time of formal coating due to deterioration or poor surface quality.
【０００４】[0004]
【課題を解決するための手段】本発明は、このような状
況に鑑み鋭意研究を行い、前記品質不良の原因は、熱間
押出前のハンドリング中に付着した鉄片、アルミ片、Ａ
ｌ2 Ｏ 3，ＳｉＯ2 、或いはコンテナスリーブの耐熱鋼
剥離片等の異物が、熱間押出の際に超電導複合ビレット
の外周部に押込まれ、後の伸線加工中に断線や絶縁不良
を惹き起こすことを知見し、更に研究を進めて本発明を
完成するに至ったものである。即ち、本発明は、安定化
材となす金属製パイプ内に超電導素材を充填した超電導
複合ビレットを所定温度に加熱して、前方にダイスを配
置したコンテナスリーブ内に装入し、前記所定温度に加
熱した超電導複合ビレットを、後方よりステムにて押圧
して、前記ダイスから押出す超電導複合ビレットの熱間
押出方法において、前記コンテナスリーブ内周面とステ
ム外周面との間に２mm〜１０mmのクリアランスを設けた
ことを特徴とする超電導複合ビレットの熱間押出方法で
ある。SUMMARY OF THE INVENTION The present invention has been studied diligently in view of such circumstances, and the causes of the above-mentioned poor quality are iron pieces, aluminum pieces, A pieces attached during handling before hot extrusion.
Foreign matter, such as l 2 O 3 , SiO 2 , or heat-resistant steel peeling pieces of the container sleeve, is pushed into the outer periphery of the superconducting composite billet during hot extrusion, causing disconnection and poor insulation during subsequent drawing. The inventor of the present invention has found that this occurs, and has conducted further research to complete the present invention. That is, the present invention heats a superconducting composite billet filled with a superconducting material in a metal pipe serving as a stabilizing material to a predetermined temperature, and charges the superconducting billet into a container sleeve in which a die is arranged in front, and reaches the predetermined temperature. In a method of hot extrusion of a superconducting composite billet, in which a heated superconducting composite billet is pressed from behind by a stem and extruded from the die, a clearance of 2 mm to 10 mm is provided between the inner peripheral surface of the container sleeve and the outer peripheral surface of the stem. And a hot extrusion method for a superconducting composite billet.
【０００５】本発明を図を参照して具体的に説明する。
図１イ，ロは本発明方法の態様を示す工程説明図であ
る。図において、１はダイス、２はコンテナスリーブ、
３は超電導複合ビレット、４はステムである。前方にダ
イス１を配置したコンテナスリーブ２内に超電導複合ビ
レット３を装入し、前記複合ビレット３を後方からステ
ム４にて押圧して、前記ダイス１から押出す。コンテナ
スリーブ２内周面とステム４外周面との間には所定のク
リアランスが設けてある（図イ）。このクリアランスに
より、異物が押込まれた複合ビレット３の外周部分がコ
ンテナスリーブ２内周面にシェル５として残り、従って
異物の無い高品質の押出材６が得られる（図ロ）。The present invention will be specifically described with reference to the drawings.
FIGS. 1A and 1B are process explanatory views showing an embodiment of the method of the present invention. In the figure, 1 is a die, 2 is a container sleeve,
3 is a superconducting composite billet, and 4 is a stem. A superconducting composite billet 3 is inserted into a container sleeve 2 in which a die 1 is disposed in front, and the composite billet 3 is pressed from behind by a stem 4 and extruded from the die 1. A predetermined clearance is provided between the inner peripheral surface of the container sleeve 2 and the outer peripheral surface of the stem 4 (FIG. 1A). Due to this clearance, the outer peripheral portion of the composite billet 3 into which the foreign matter has been pushed remains as the shell 5 on the inner peripheral surface of the container sleeve 2, and thus a high-quality extruded material 6 free of foreign matter can be obtained (FIG. 2B).
【０００６】本発明方法において、前記クリアランスを
２mm〜１０mmに限定した理由は、２mm未満ではシェル量
が少なく異物が十分除去されず、１０mmを超えると異物
除去効果が飽和する上、押出歩留りが低下する為であ
る。コンテナスリーブとステムとは同軸上に配置し、両
者間のクリアランスは周囲均等にする。クリアランスの
大きさは超電導複合ビレットの径、押出材の径、押出温
度等を勘案して決められる。コンテナスリーブと超電導
複合ビレットとのクリアランスは小さい方が押出圧力が
安定して好ましい。In the method of the present invention, the reason for limiting the clearance to 2 mm to 10 mm is that if the clearance is less than 2 mm, the amount of shell is small and foreign matter is not sufficiently removed. If the clearance exceeds 10 mm, the effect of removing foreign matter is saturated and the extrusion yield decreases. To do that. The container sleeve and the stem are arranged coaxially, and the clearance between them is made equal around the circumference. The size of the clearance is determined in consideration of the diameter of the superconducting composite billet, the diameter of the extruded material, the extrusion temperature, and the like. A smaller clearance between the container sleeve and the superconducting composite billet is preferable because the extrusion pressure is stable.
【０００７】安定化材となす金属製パイプ内に充填する
超電導素材には、超電導棒材、又は安定化金属を複合し
た単芯或いは多芯超電導線を多数本束ねた超電導線集合
体が適用される。又安定化材となす金属製パイプ内に充
填する超電導素材には、Ｎｂ金属又はＮｂＴｉ合金のい
ずれかを含むものが適用される。As the superconducting material to be filled in the metal pipe serving as a stabilizing material, a superconducting rod material or a superconducting wire aggregate obtained by bundling a large number of single-core or multi-core superconducting wires in which a stabilizing metal is combined is applied. You. As the superconducting material to be filled in the metal pipe serving as the stabilizing material, a material containing either Nb metal or NbTi alloy is applied.
【０００８】[0008]
【作用】本発明では、超電導複合ビレットの熱間押出方
法において、前記コンテナスリーブ内周面とステム外周
面との間に２mm〜１０mmのクリアランスを設けたので、
超電導複合ビレットの外周に押込まれた金属片等の異物
は、コンテナスリーブ内周面に付着したシェル内に残
り、押出材は異物のない高品質なものとなる。According to the present invention, in the method for hot extrusion of a superconducting composite billet, a clearance of 2 mm to 10 mm is provided between the inner peripheral surface of the container sleeve and the outer peripheral surface of the stem.
Foreign matter such as metal pieces pressed into the outer periphery of the superconducting composite billet remains in the shell adhered to the inner peripheral surface of the container sleeve, and the extruded material is of high quality without foreign matter.
【０００９】[0009]
【実施例】以下に本発明を実施例により詳細に説明す
る。 実施例１ 150mmφのＮｂＴｉ合金ビレットを、 1.5mm厚さのＮｂ
管を内接させた外径 210mmφ，内径 157mmφの無酸素銅
管に装入し、次いでこのパイプの両端に無酸素銅製の蓋
を電子ビーム溶接により真空封止して被せた。次いでこ
れにＨＩＰ処理（熱間静水圧圧縮、 800℃×1500atm ×
１hr）を施したのち、外径 200mmφに外削して超電導複
合ビレットを作製した。次に前記超電導複合ビレット
を、前方にダイスを配置したコンテナスリーブ内に装入
し、後方よりステムで押圧して25mmφの押出材を製出し
た。押出温度は 800℃、コンテナスリーブの内径は 207
mmφとした。ステムには種々外径のものを用いた。次に
前記押出材を伸線加工して３mmφの単芯超電導線材とな
した。The present invention will be described below in detail with reference to examples. Example 1 A 150 mmφ NbTi alloy billet was replaced with a 1.5 mm thick Nb
The pipe was inserted into an oxygen-free copper pipe having an outer diameter of 210 mmφ and an inner diameter of 157 mmφ in which the pipe was inscribed. Then, both ends of the pipe were covered by vacuum sealing by electron beam welding on both ends of the pipe. Next, this is subjected to HIP treatment (hot isostatic pressing, 800 ° C × 1500atm ×
After 1 hour), a superconducting composite billet was produced by external cutting to an outer diameter of 200 mmφ. Next, the superconducting composite billet was placed in a container sleeve in which a die was arranged in front, and pressed with a stem from the rear to produce an extruded material of 25 mmφ. Extrusion temperature 800 ° C, inner diameter of container sleeve 207
mmφ. Stems of various outer diameters were used. Next, the extruded material was drawn into a 3 mmφ single core superconducting wire.
【００１０】実施例２ 実施例１で製造した３mmφの超電導線材を0.4 mmφに伸
線し、これにホルマールを10μｍ厚さに被覆し、ホルマ
ール被覆層に発生した気泡の数を数えた。Example 2 The superconducting wire of 3 mmφ produced in Example 1 was drawn to 0.4 mmφ and coated with formal to a thickness of 10 μm, and the number of bubbles generated in the formal coating layer was counted.
【００１１】[0011]
【表１】 クリアランスは、コンテナスリーブの内径(207mmφ）
とステム外径の差。1,000 ｍ当たり。 10,000 ｍ当
たり。[Table 1] Clearance is inner diameter of container sleeve (207mmφ)
And stem outer diameter difference. Per 1,000 m. Per 10,000m.
【００１２】表１より明らかなように、本発明方法品
（No１〜６）は渦流探傷数がゼロであり、ホルマール被
覆層の気泡数も少なかった。コンテナスリーブとステム
間のクリアランスが大きい程品質が向上した。これに対
し比較例品（No７，８）は渦流探傷数も気泡数も多く品
質不良であった。これは前記クリアランスが小さい為、
超電導複合ビレット外周部に押込まれた異物が押出材に
混入した為である。本発明方法品について、押出後のコ
ンテナスリーブ内面に付着したシェルを硝酸に溶解して
残渣を分析した。Ａｌ2 Ｏ 3、ＳｉＯ2 、鉄片、耐熱鋼
片等が多数検出された。As is clear from Table 1, the method articles of the present invention (Nos. 1 to 6) had no eddy current detection number and a small number of bubbles in the formal coating layer. The larger the clearance between the container sleeve and the stem, the better the quality. On the other hand, the products of Comparative Examples (Nos. 7 and 8) had a large number of eddy current flaws and a large number of bubbles, and were of poor quality. This is because the clearance is small,
This is because foreign matter pushed into the outer periphery of the superconducting composite billet was mixed into the extruded material. Regarding the method product of the present invention, the shell adhered to the inner surface of the container sleeve after extrusion was dissolved in nitric acid, and the residue was analyzed. Many Al 2 O 3 , SiO 2 , iron pieces, heat-resistant steel pieces, etc. were detected.
【００１３】実施例３ 実施例１で得られた３mmφの超電導線を多数本束ねて無
酸素銅管に充填して超電導複合ビレットとなした他は、
実施例１と同じ方法により３mmφの多芯超電導線を製造
した。得られた多芯超電導線について、伸線加工中の断
線回数を調べた。又５テスラーにおける臨界電流密度
（Ｊｃ）とｎ値を測定した。結果を表２に示した。尚、
ｎ値とは、臨界電流Ｉとその時の両端電圧Ｖとの間に成
り立つＶ∝Ｉn の関係式中の指数である。ｎ値が大きい
程、クエンチが起き難い。Example 3 A number of superconducting wires of 3 mmφ obtained in Example 1 were bundled and filled in an oxygen-free copper tube to form a superconducting composite billet.
A multicore superconducting wire having a diameter of 3 mm was manufactured in the same manner as in Example 1. About the obtained multifilamentary superconducting wire, the number of disconnections during wire drawing was examined. The critical current density (Jc) and n value at 5 Tesla were measured. The results are shown in Table 2. still,
The n value is an index in the relational expression VarufaI n that holds between the critical current I and the voltage V across time. Quenching is less likely to occur as the value of n increases.
【００１４】[0014]
【表２】 40Km当たり。単位：Ａ／mm2 。[Table 2] Per 40km. Unit: A / mm 2 .
【００１５】表２より明らかなように、本発明方法品(9
〜11) は断線頻度が低く、又Ｊｃが高い値を示した。こ
れに対し、比較例品（No12）は断線頻度が高く、又Ｊｃ
及びｎ値が低下した。これは超電導フィラメントが不均
一に変形し又多数断線したことによる。As is apparent from Table 2, the product of the present invention (9
11) showed a low value of the disconnection frequency and a high value of Jc. On the other hand, the comparative example product (No. 12) has a high disconnection frequency, and Jc
And the n value decreased. This is due to the non-uniform deformation of the superconducting filament and a large number of broken wires.
【００１６】以上、ＮｂＴｉ超電導線の場合について説
明したが、本発明方法はＮｂ3 Ｓｎ超電導線の製造に適
用しても同様の効果が得られる。Although the case of the NbTi superconducting wire has been described above, the same effect can be obtained by applying the method of the present invention to the production of an Nb 3 Sn superconducting wire.
【００１７】[0017]
【効果】以上述べたように、本発明方法によれば、超電
導複合ビレットを高品質に押出すことができ、得られる
超電導線は品質良好であり又Ｊｃ等の超電導特性にも優
れ、工業上顕著な効果を奏する。As described above, according to the method of the present invention, a superconducting composite billet can be extruded with high quality, and the superconducting wire obtained has good quality and excellent superconducting properties such as Jc. Has a remarkable effect.
【図１】本発明方法の態様を示す工程説明図である。FIG. 1 is a process explanatory view showing an embodiment of the method of the present invention.
１ ダイス ２ コンテナスリーブ ３ 超電導複合ビレット ４ ステム ５ シェル ６ 押出材 Reference Signs List 1 die 2 container sleeve 3 superconducting composite billet 4 stem 5 shell 6 extruded material
Claims (3)
素材を充填した超電導複合ビレットを所定温度に加熱し
て、前方にダイスを配置したコンテナスリーブ内に装入
し、前記所定温度に加熱した超電導複合ビレットを、後
方よりステムにて押圧して、前記ダイスから押出す超電
導複合ビレットの熱間押出方法において、前記コンテナ
スリーブ内周面とステム外周面との間に２mm〜１０mmの
クリアランスを設けたことを特徴とする超電導複合ビレ
ットの熱間押出方法。1. A superconducting composite billet in which a superconducting material is filled in a metal pipe serving as a stabilizing material is heated to a predetermined temperature, charged into a container sleeve in which a die is arranged in front, and heated to the predetermined temperature. The superconducting composite billet is pressed from behind by a stem, and the superconducting composite billet is extruded from the die. In the hot extrusion method, a clearance of 2 mm to 10 mm is provided between the inner peripheral surface of the container sleeve and the outer peripheral surface of the stem. A hot extrusion method for a superconducting composite billet, the method comprising:
る超電導素材が、超電導棒材、又は安定化金属を複合し
た単芯或いは多芯超電導線を多数本束ねた超電導線集合
体であることを特徴とする請求項１記載の超電導複合ビ
レットの熱間押出方法。2. A superconducting material to be filled in a metal pipe serving as a stabilizing material is a superconducting rod material or a superconducting wire aggregate obtained by bundling a large number of single-core or multi-core superconducting wires obtained by combining a stabilizing metal. The hot extrusion method for a superconducting composite billet according to claim 1, wherein:
る超電導素材が、Ｎｂ金属又はＮｂＴｉ合金のいずれか
を含むものであることを特徴とする請求項１又は請求項
２記載の超電導複合ビレットの熱間押出方法。3. The superconducting composite billet according to claim 1, wherein the superconducting material filled in the metal pipe serving as the stabilizing material contains one of Nb metal and NbTi alloy. Hot extrusion method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5273097A JP2644432B2 (en) | 1993-10-05 | 1993-10-05 | Hot extrusion method of superconducting composite billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5273097A JP2644432B2 (en) | 1993-10-05 | 1993-10-05 | Hot extrusion method of superconducting composite billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07134920A JPH07134920A (en) | 1995-05-23 |
| JP2644432B2 true JP2644432B2 (en) | 1997-08-25 |
Family
ID=17523102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5273097A Expired - Lifetime JP2644432B2 (en) | 1993-10-05 | 1993-10-05 | Hot extrusion method of superconducting composite billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2644432B2 (en) |
-
1993
- 1993-10-05 JP JP5273097A patent/JP2644432B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07134920A (en) | 1995-05-23 |
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