JPH04132118A - Manufacture of nb3x multi-core superconducting wire - Google Patents
Manufacture of nb3x multi-core superconducting wireInfo
- Publication number
- JPH04132118A JPH04132118A JP2252326A JP25232690A JPH04132118A JP H04132118 A JPH04132118 A JP H04132118A JP 2252326 A JP2252326 A JP 2252326A JP 25232690 A JP25232690 A JP 25232690A JP H04132118 A JPH04132118 A JP H04132118A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- segment
- primary
- superconducting wire
- pipe
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims 1
- 229910001092 metal group alloy Inorganic materials 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 229910052715 tantalum Inorganic materials 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 229910052726 zirconium Inorganic materials 0.000 claims 1
- 239000011159 matrix material Substances 0.000 abstract description 6
- 229910052758 niobium Inorganic materials 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000000886 hydrostatic extrusion Methods 0.000 description 3
- 229910000657 niobium-tin Inorganic materials 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
Landscapes
- Wire Processing (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、たとえば核融合炉用およびＳＭＥＳ用など
の超電導線材として用いることのできるＮｂ３Ｘ多芯超
電導線の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a Nb3X multicore superconducting wire that can be used as a superconducting wire for, for example, nuclear fusion reactors and SMES.
［従来の技術］
Ｎｂ、ＡＩ超電導材料は、３０Ｔを超えると言われてい
る高い臨界磁界を有しており、歪特性もＮｂ３ Ｓｎよ
り良好なことから、ＮｂＴｉおよびＮｂ３ Ｓｎに続く
第３の実用的な超電導材料として期待されており、特に
核融合炉の超電導マグネット用線材として期待されてい
る。[Prior art] Nb and AI superconducting materials have a high critical magnetic field said to exceed 30T, and have better strain characteristics than Nb3Sn, so they are the third practical material following NbTi and Nb3Sn. It is expected to be used as a superconducting material, especially as a wire for superconducting magnets in nuclear fusion reactors.
また、近年、Ｎｂ３Ａｔ超電導線において、■ｂおよび
Ａｔの厚みを０．１μｍ程度にまで薄くすると、臨界電
流密度が上昇し、Ｎｂ３ Ｓｎの臨界電流密度と同等か
、あるいはこれを超える高い値が得られると報告されて
いる。In addition, in recent years, in Nb3At superconducting wires, when the thickness of b and At is reduced to about 0.1 μm, the critical current density increases, and a high value equal to or exceeding the critical current density of Nb3Sn can be obtained. It is reported that
しかしながら、ＮｂとＡＩの加工性がよくないため、工
業的には長尺化が困難であり、長尺の超電導線として得
ることができないという問題があった。ジェリーロール
法およびＮｂパイプ法等により、ＮｂａＡＬの長尺線材
化が試みられているが、未だ十分な成果は得られていな
い。たとえば、核融合炉の超電導マグネットに用いる線
材としては、少なくとも６００ｍの長さが必要であり、
現在の目標としては１０００ｍ以上の長尺化が要望され
ている。また、Ｃｕ−１０％Ｎｉをシースとした線材化
が一部試みられているが、安定化材としてはＣｕを用い
ることが必要である。However, due to the poor workability of Nb and AI, it is difficult to lengthen it industrially, and there is a problem that it is impossible to obtain a long superconducting wire. Attempts have been made to make NbaAL into a long wire by the jelly roll method, the Nb pipe method, etc., but sufficient results have not yet been obtained. For example, wire rods used for superconducting magnets in fusion reactors need to be at least 600 m long.
The current goal is to have a length of 1,000 meters or more. Further, although some attempts have been made to make wire rods using Cu-10%Ni as sheaths, it is necessary to use Cu as a stabilizing material.
［発明が解決しようとする課題］
このように、Ｎｂ３Ａｔ多芯超電導線において長尺化が
困難な理由は、ＮｂとＡＩの積層部における相互の界面
が、面積的に大きいことと、異種金属同士であるために
、伸線加工中におけるＡｔとＮｂの変形量が相違し、密
着性が不良になり、断線が生じることによる。[Problem to be solved by the invention] As described above, the reason why it is difficult to increase the length of Nb3At multicore superconducting wires is that the mutual interface in the laminated part of Nb and AI is large in area, and the mutual interface between different metals Therefore, the amount of deformation of At and Nb during wire drawing is different, resulting in poor adhesion and wire breakage.
長尺線材の製作が可能なＮｂとＡＩの厚さは、従来は、
０．８μｍおよび０，２μｍ程度である。Conventionally, the thickness of Nb and AI that allows the production of long wire rods is
They are about 0.8 μm and 0.2 μm.
このような厚みでは、熱処理しても、高い臨界電流密度
（Ｊ ｃ）は得られず、２００Ａ／ｍｍ２（１２Ｔ）程
度である。このため、現在実用化されているＮｂ３ Ｓ
ｎ超電導線の半分程度でしかない。With such a thickness, even if heat treated, a high critical current density (J c ) cannot be obtained, which is about 200 A/mm 2 (12 T). For this reason, Nb3S, which is currently in practical use,
It is only about half that of n superconducting wire.
この発明の目的は、このような従来の問題点を解消し、
ＮｂおよびＡｔの厚さをさらに薄くして高い臨界電流密
度を得ることのできるＮｂ３ＡｌなどのＮｂ３Ｘ系多芯
超電導線の製造方法を提供することにある。The purpose of this invention is to solve such conventional problems,
It is an object of the present invention to provide a method for manufacturing a multicore superconducting wire based on Nb3X such as Nb3Al, which can obtain a high critical current density by further reducing the thickness of Nb and At.
［課題を解決するための手段］
この発明の製造方法は、Ｎｂ金属またはＮｂ合金からな
るＮｂ含有シートとＮｂと反応して超電導性を示す化合
物を作る元素Ｘまたは元素Ｘを含む合金からなるＸ含有
シートを重ね合せてロール状に巻き、ＣｕまたはＣｕ合
金パイプ中に挿入した１次スタックを少なくとも１回の
押出より縮径加工して１次セグメントとするステップと
、複数の１次セグメントをＣｕまたはＣｕ合金パイプ中
に挿入して２次スタックを形成し、この２次スタックを
押出により縮径加工して２次セグメントとするステップ
と、２次セグメントを所望の線径まで縮径加工するステ
ップと、２次セグメントを加熱処理してＮｂ３Ｘを形成
するステップとを備えている。[Means for Solving the Problems] The manufacturing method of the present invention provides an Nb-containing sheet made of an Nb metal or an Nb alloy, and an Nb-containing sheet made of an element X or an alloy containing the element A step of stacking the containing sheets and winding them into a roll, and reducing the diameter of the primary stack inserted into a Cu or Cu alloy pipe through at least one extrusion to form a primary segment; Or inserting it into a Cu alloy pipe to form a secondary stack, reducing the diameter of this secondary stack by extrusion to form a secondary segment, and reducing the diameter of the secondary segment to a desired wire diameter. and heat treating the secondary segment to form Nb3X.
Ｎｂと反応して超電導性を示す化合物を作る元素Ｘとし
ては、たとえばＡｌ、ＳｎまたはＧｅなどがある。Examples of the element X that reacts with Nb to form a compound exhibiting superconductivity include Al, Sn, and Ge.
Ｎｂ合金および／または元素Ｘを含む合金中の含有合金
元素としては、Ｔ Ｉ ＳＳ ｔ ｓ Ｈｆ Ｎ Ｔ
ａ ｓＺｒ、ＭｇまたはＢｅなどが挙げられる。The alloying elements contained in the Nb alloy and/or the alloy containing element X include T I SS t s Hf N T
Examples include a sZr, Mg, and Be.
［発明の作用効果］
この発明では、押出により縮径加工して１次セグメント
を形成しているので、Ｃｕ、ＸおよびＮｂの相互の界面
の密着性が良好となり、したがって線材全体の加工性が
向上する。[Operations and Effects of the Invention] In this invention, since the primary segment is formed by diameter reduction processing by extrusion, the adhesion of the mutual interface between Cu, X and Nb is improved, and therefore the workability of the entire wire is improved. improves.
この発明において、１次セグメントを形成する際の押出
法として、は、熱間押出法および静水圧押出法などを採
用することができる。In this invention, as the extrusion method for forming the primary segment, hot extrusion method, hydrostatic extrusion method, etc. can be adopted.
また、この発明において、１次セグメントを形成する際
に複数回押出すれば、ＮｂとＸの厚みを極限まで薄くす
ることができる。このため、臨界電流密度（Ｊ ｃ）を
飛躍的に向上させることができる。また複数回押出すこ
とにより、Ｃｕ、ＮｂおよびＸの・相互の密着性をより
向上させることができ、線材全体の加工性を高めること
ができる。Furthermore, in the present invention, by extruding multiple times when forming the primary segment, the thickness of Nb and X can be made as thin as possible. Therefore, the critical current density (Jc) can be dramatically improved. Moreover, by extruding multiple times, the mutual adhesion of Cu, Nb, and X can be further improved, and the workability of the entire wire can be improved.
また、この発明に従えば、１次セグメントを形成するの
に押出を用いており、押出は１回の加工度を大きくとる
ことができるので、生産性も向上させることができる。Further, according to the present invention, extrusion is used to form the primary segment, and since extrusion can increase the degree of processing per time, productivity can also be improved.
［実施例］
実施例１
第１図に示すように、Ｎｂシート１の上にＡｔシート２
を並べて配置し、Ｎｂシート１とＡｔシート２をＣｕ棒
３を中心にして巻込み重ね合せてロール状にした。これ
をマトリックスパイプとしてのＣｕパイプ４中に挿入し
た。この後電子ビーム溶接により両端をＣｕで蓋をして
、静水圧押出法により直径７０ｍｍから直径２５ｍｍに
押出し縮径加工した。[Example] Example 1 As shown in FIG. 1, an At sheet 2 was placed on a Nb sheet 1.
were arranged side by side, and the Nb sheet 1 and the At sheet 2 were wound around the Cu rod 3 and overlapped to form a roll. This was inserted into a Cu pipe 4 as a matrix pipe. Thereafter, both ends were capped with Cu by electron beam welding, and the diameter was reduced by extrusion from 70 mm to 25 mm by hydrostatic extrusion.
第２図は、このようにして得られた１次セグメント５を
示す断面図である。FIG. 2 is a sectional view showing the primary segment 5 thus obtained.
このようにして得られた１次セグメントを線引加工して
断面六角形状の一層セグメント６とした後、第３図に示
すように、マトリックスパイプとしてのＣｕパイプ７中
に複数配置して２次スタックとした。この２次スタック
を再度静水圧押出して２次セグメントとした後、この２
次セグメントを伸線加工して所望の線径のＮｂ３Ａｔ多
芯超電導線とした。After drawing the primary segment thus obtained into a single-layer segment 6 with a hexagonal cross section, a plurality of them are arranged in a Cu pipe 7 as a matrix pipe to create a secondary segment, as shown in FIG. Stacked. After this secondary stack is hydrostatically extruded again to form secondary segments, the secondary stack is
The next segment was drawn to obtain a Nb3At multicore superconducting wire with a desired wire diameter.
第４図は、このようにして得られたＮｂ３Ａｔ多芯超電
導線を示す断面図である。第４図を参照して、Ｃｕマト
リックス８中には多数の１次セグメント６が形成されて
いる。この実施例では、表１に示すように最終線径が０
．８１ｍｍとなるように伸線加工され、Ｎｂ５ＡＬフイ
ラメント中のＮｂ層の厚みが２９５ｎｍ、Ａ１層の厚み
が８０ｎｍとなるように、使用するＮｂシートおよびＡ
ｔシートの厚みを定めている。FIG. 4 is a cross-sectional view showing the Nb3At multicore superconducting wire obtained in this manner. Referring to FIG. 4, a large number of primary segments 6 are formed in the Cu matrix 8. In this example, the final wire diameter is 0 as shown in Table 1.
．． The Nb sheet used and the A
The thickness of the t-sheet is determined.
実施例２
１次スタックを縮径加工して１次セグメントとする際の
押出を２回の静水圧押出とする以外は、上記の実施例１
と同様にしてＮｂ３Ａｔ多芯超電導線を作製した。Example 2 Example 1 above, except that the extrusion when reducing the diameter of the primary stack to form the primary segment was carried out twice using hydrostatic extrusion.
A Nb3At multicore superconducting wire was produced in the same manner as described above.
最終的な超電導線の線径において、ＮｂおよびＡｔの厚
みは、それぞれ１１０ｎｍおよび３０ｎｍとなり、実施
例１に比べると非常に薄くなった。In the final wire diameter of the superconducting wire, the thicknesses of Nb and At were 110 nm and 30 nm, respectively, which were much thinner than in Example 1.
実施例３
この実施例では、実施例２と同様に１次スタックから１
次セグメントに縮径加工する際の押出を２回の熱間直接
押出により行なった。ただし最終的なＮｂおよびＡＩの
厚みが、上記実施例１とほぼ同じになるように、予めＮ
ｂシートおよびＡｔシートの厚みを調整しておいた。Example 3 In this example, as in Example 2, one
Extrusion for diameter reduction into the next segment was carried out by two hot direct extrusions. However, Nb and AI should be prepared in advance so that the final thicknesses of Nb and AI are almost the same as in Example 1 above.
The thicknesses of the b sheet and the At sheet were adjusted in advance.
比較例
１次スタックを１次セグメントに縮径加工するのに、押
出ではなく伸線加工を用いた以外は、上記の実施例と同
様にしてＮｂ３Ａｔ多芯超電導線を作製した。Comparative Example A Nb3At multifilamentary superconducting wire was produced in the same manner as in the above example, except that wire drawing was used instead of extrusion to reduce the diameter of the primary stack into primary segments.
上記実施例１〜３および比較例の最終線径におけるＮｂ
層およびＡｔ層の厚み、ならびに単長（最終的な伸線加
工により得られた線材の平均長さ）、および１２Ｔ、４
．２Ｋにおける非端部当りの臨界電流密度（Ｊ ｃ）を
併せて表１に示した。Nb in the final wire diameter of Examples 1 to 3 and Comparative Example above
The thickness of the layer and the At layer, and the unit length (average length of the wire obtained by the final wire drawing process), and 12T, 4
．． The critical current density (Jc) per non-end portion at 2K is also shown in Table 1.
（珠−ト今りン
表１
表１から明らかなように、この発明に従い、１次スタッ
クから１次セグメントに縮径加工する際の加工方法を押
出とした実施例１〜３は、最終的な線材の長さを従来の
比較例のものより長くすることができ、またＪｃの高い
超電導線を得ることができた。(Tamamarin Table 1 As is clear from Table 1, in Examples 1 to 3, in which extrusion was used as the processing method when reducing the diameter from the primary stack to the primary segment according to the present invention, the final The length of the wire material could be made longer than that of the conventional comparative example, and a superconducting wire with a high Jc could be obtained.
また実施例２からも明らかなように、１次スタックから
１次セグメントに縮径加工する際の押出を複数回行なう
ことにより、より一層Ｎｂ層およびＡｔ層の厚みを薄く
することができ、より高いＪｃを得ることのできること
がわかった。Furthermore, as is clear from Example 2, by performing extrusion multiple times when reducing the diameter from the primary stack to the primary segment, the thickness of the Nb layer and the At layer can be made even thinner. It was found that high Jc can be obtained.
第１図は、この発明に従い１次スタックを形成する方法
を示す斜視図である。
第２図は、この発明に従い形成された１次セグメントを
示す断面図である。
第３図は、この発明に従い２次スタックを形成する方法
を示す斜視図である。
第４図は、この発明に従い形成された２次セグメントを
示す断面図である。
図において、ｌはＮｂシート、２はＡＩレシート３はＣ
ｕ棒、４はＣｕパイプ、５は１次セグメント、６は六角
形状にされた１次セグメント、７はＣｕバイブ、８はＣ
ｕマトリックス、９は２次セグメントを示す。
２図FIG. 1 is a perspective view illustrating a method of forming a primary stack according to the present invention. FIG. 2 is a cross-sectional view of a primary segment formed in accordance with the present invention. FIG. 3 is a perspective view illustrating a method of forming a secondary stack according to the present invention. FIG. 4 is a cross-sectional view of a secondary segment formed in accordance with the present invention. In the figure, l is Nb sheet, 2 is AI receipt, 3 is C
U rod, 4 is Cu pipe, 5 is primary segment, 6 is hexagonal primary segment, 7 is Cu vibe, 8 is C
u matrix, 9 indicates the secondary segment. Figure 2
Claims (3)
とＮｂと反応して超電導性を示す化合物を作る元素Ｘま
たは元素Ｘを含む合金からなるＸ含有シートを重ね合せ
てロール状に巻き、ＣｕまたはＣｕ合金パイプ中に挿入
した１次スタックを少なくとも１回の押出により縮径加
工して１次セグメントとするステップと、 複数の前記１次セグメントをＣｕまたはＣｕ合金パイプ
中に挿入して２次スタックを形成し、この２次スタック
を押出により縮径加工して２次セグメントとするステッ
プと、 前記２次セグメントを所望の線径まで縮径加工するステ
ップと 前記２次セグメントを加熱処理してＮｂ＿３Ｘを形成す
るステップと を備える、Ｎｂ＿３Ｘ多芯超電導線の製造方法。(1) A Nb-containing sheet made of Nb metal or Nb alloy and an X-containing sheet made of element A step of reducing the diameter of a primary stack inserted into a Cu alloy pipe by extrusion at least once to form a primary segment; and inserting a plurality of the primary segments into a Cu or Cu alloy pipe to form a secondary stack. and reducing the diameter of this secondary stack by extrusion to obtain a secondary segment; reducing the diameter of the secondary segment to a desired wire diameter; and heat-treating the secondary segment to form Nb_3X. A method for manufacturing a Nb_3X multicore superconducting wire, comprising the step of forming a Nb_3X multicore superconducting wire.
ループより選ばれる少なくとも１種である、請求項１に
記載のＮｂ＿３Ｘ多芯超電導線の製造方法。(2) The method for manufacturing a Nb_3X multicore superconducting wire according to claim 1, wherein the element X is at least one selected from the group consisting of Al, Sn, and Ge.
金中の含有合金元素が、Ｔｉ、Ｓｉ、Ｈｆ、Ｔａ、Ｚｒ
、ＭｇおよびＢｅからなるグループより選ばれる少なく
とも１種である、請求項１に記載のＮｂ＿３Ｘ多芯超電
導線の製造方法。(3) The alloying elements contained in the Nb alloy and/or the alloy containing the element X are Ti, Si, Hf, Ta, and Zr.
, Mg, and Be.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2252326A JP2808874B2 (en) | 1990-09-21 | 1990-09-21 | Nb (3) Manufacturing method of Al multi-core superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2252326A JP2808874B2 (en) | 1990-09-21 | 1990-09-21 | Nb (3) Manufacturing method of Al multi-core superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04132118A true JPH04132118A (en) | 1992-05-06 |
| JP2808874B2 JP2808874B2 (en) | 1998-10-08 |
Family
ID=17235710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2252326A Expired - Lifetime JP2808874B2 (en) | 1990-09-21 | 1990-09-21 | Nb (3) Manufacturing method of Al multi-core superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2808874B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609804A1 (en) * | 1993-02-02 | 1994-08-10 | Sumitomo Electric Industries, Limited | Wire for Nb3X superconducting wire, Nb3x superconducting wire and method of preparing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49130699A (en) * | 1973-04-13 | 1974-12-14 | ||
| JPH02148620A (en) * | 1988-11-30 | 1990-06-07 | Showa Electric Wire & Cable Co Ltd | Manufacture of nb3al superconductive wire |
-
1990
- 1990-09-21 JP JP2252326A patent/JP2808874B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49130699A (en) * | 1973-04-13 | 1974-12-14 | ||
| JPH02148620A (en) * | 1988-11-30 | 1990-06-07 | Showa Electric Wire & Cable Co Ltd | Manufacture of nb3al superconductive wire |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609804A1 (en) * | 1993-02-02 | 1994-08-10 | Sumitomo Electric Industries, Limited | Wire for Nb3X superconducting wire, Nb3x superconducting wire and method of preparing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2808874B2 (en) | 1998-10-08 |
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