【発明の詳細な説明】[Detailed description of the invention]
（産業上の利用分野）
本発明は、電気化学工業に於ける電解、めつき
等の電極への通電に使用する通電棒、所謂ブスバ
ーに関する。
（従来技術とその問題点）
一般にブスバーにはAl又はAl合金が使用され
るが、電解浴、めつき浴には塩素ガス、亜硫酸ガ
ス等の腐食性雰囲気が伴うので、耐食性に乏しい
Al又はAl合金のブスバーは交換を頻繁に行う必
要があつた。
一方、Ti又はTi合金は、耐食性に優れ、上記
腐食性雰囲気に対して長期の使用に耐えるが、電
気伝導度が低いため、電流密度を上げ、効率的な
電解或いはめつきを行うことができなかつた。
近時、クラツド技術が進み、Al又はAl合金を、
Ti又はTi合金でクラツドし、導電性に富み且つ
耐食性にも優れた導電用複合ブスバーが開発され
ている。
この導電用複合ブスバーは、熱間押出法、圧延
法、引抜き法、爆発圧着法等により製作される
が、最も量産性に富み、しかも全周囲をTi又は
Ti合金で被覆することのできる熱間押出法によ
るものが工業的には有利である。さらに芯材の
Al又はAl合金を電気伝導度の良い状態で使うた
めに450℃以上で焼鈍することが好ましい。
然るに、Ti又はTi合金は非常に反応性に富み、
特にAl又はAl合金とは熱間押出時の加熱温度、
加工熱等で容易に脆性のAl3Ti、AlTi、AlTi3の
金属間化合物を作る為、クラツド強度が弱く、押
出後の圧延加工、伸線加工、曲げ加工時にクラツ
ド面での剥離が生ずるという欠点があつた。また
生産性を落とし、断面減少率を低くし、押出温度
を低く抑えて金属間化合物の生成を防ぐことはで
きるが、その後の圧延加工等の加工後の歪取り焼
鈍の際に金属間化合物が生成してしまい、クラツ
ド強度が劣下するという欠点があつた。
（発明の目的）
本発明は、上記欠点を解消すべくなされたもの
であり、生産性を上げるために断面減少率を高く
してもクラツド面で剥離が起こらず、その後加工
の歪取り焼鈍を行つてもクラツド強度が劣下せ
ず、複雑な形状にも加工できる導電用複合ブスバ
ーを提供することを目的とするものである。
（問題点を解決するための手段）
上記問題点を解決するための本発明の導電用複
合ブスバーは、Al又はAl合金の芯材の外側に、
中間層としてMoが介され、さらにその外側にTi
又はTi合金がクラツドされて成るものである。
本発明の導電用複合ブスバーは、製作時Ti又
はTi合金／Mo／Al又はAl合金のビレツトを熱間
押出或いは押出後の歪取り焼鈍、電気伝導度を上
げるための焼鈍などの加熱処理を行うので、Mo
がTiとAlの拡散防止材となり、Al−Ti金属間化
合物の生成を防止でき、しかもMoとTi、Moと
Alは夫々少量固溶し合い、強固で延性のある拡
散層が生成されクラツド強度を上げることができ
る。
中間層のMoは、製作時どのような形で挿入し
ても良いが、Ti又はTiパイプとAl又はAl合金ビ
レツトの中間に薄板の形で挿入し、その後熱間押
出工程により線材又は板材の導電用複合ブスバー
を作るのが一般的である。
（実施例）
本発明の導電用複合ブスバーの実施例を従来例
と共に説明する。
先ず従来例について説明すると、外径104mm、
内径92mmのTiパイプに外径91mmのAlビレツトを
挿入し、封塞した後550℃で押出加工した。押出
材は幅60mm、厚さ20mmであつた。その後500℃で
歪取り焼鈍を行い、幅70mm、厚さ10mmに圧延加工
してブスバーを作り、これを冷間で90度曲げ試験
を行つた。
次に実施例について説明すると、外径104mm、
内径92mmTiパイプに外径91mmのAlビレツトを挿
入し、このTiパイプとAlビレツトとの間に厚さ
0.1mmのMoの薄板を挿入し、これらを封塞した後
550℃で押出加工した。押出材は幅60mm、厚さ20
mmであつた。その後500℃で歪取り焼鈍を行い、
幅70mm、厚さ10mmに圧延加工してフスバーを作
り、これを冷間で90度曲げ試験を行つた。
上記従来例と実施例の圧延加工後のブスバーと
曲げ試験後のブスバーの断面を金属顕微鏡で観察
したところ、下記の表に示すような結果が得られ
た。
(Field of Industrial Application) The present invention relates to a current-carrying rod, a so-called bus bar, used for energizing electrodes for electrolysis, plating, etc. in the electrochemical industry. (Prior art and its problems) Generally, Al or Al alloy is used for busbars, but since electrolytic baths and plating baths involve corrosive atmospheres such as chlorine gas and sulfur dioxide gas, they have poor corrosion resistance.
Al or Al alloy busbars had to be replaced frequently. On the other hand, Ti or Ti alloy has excellent corrosion resistance and can withstand long-term use in the above corrosive atmosphere, but because of its low electrical conductivity, it is difficult to increase current density and perform efficient electrolysis or plating. Nakatsuta. Recently, cladding technology has progressed, and Al or Al alloy has been
A conductive composite busbar has been developed that is clad with Ti or Ti alloy and has high conductivity and excellent corrosion resistance. This conductive composite busbar is manufactured by hot extrusion, rolling, drawing, explosive crimping, etc., but it is the most easily mass-produced, and the entire periphery is covered with Ti or
It is industrially advantageous to use a hot extrusion method that allows coating with a Ti alloy. Furthermore, the core material
In order to use Al or Al alloy with good electrical conductivity, it is preferable to anneal it at 450°C or higher. However, Ti or Ti alloys are highly reactive;
In particular, for Al or Al alloy, the heating temperature during hot extrusion,
Because brittle intermetallic compounds of Al 3 Ti, AlTi, and AlTi 3 are easily formed by processing heat, etc., the cladding strength is weak and peeling occurs on the cladding surface during rolling, wire drawing, and bending after extrusion. There were flaws. In addition, it is possible to prevent the formation of intermetallic compounds by lowering productivity, lowering the area reduction rate, and keeping the extrusion temperature low, but intermetallic compounds are generated during strain relief annealing after subsequent processing such as rolling. This has the disadvantage that the cladding strength deteriorates. (Objective of the Invention) The present invention has been made to eliminate the above-mentioned drawbacks.In order to increase productivity, peeling does not occur on the cladding surface even if the area reduction rate is increased, and after that, strain relief annealing during processing is performed. The object of the present invention is to provide a conductive composite busbar that does not deteriorate in cladding strength even when the cladding is used, and can be processed into complex shapes. (Means for Solving the Problems) The conductive composite busbar of the present invention for solving the above problems has a core material of Al or Al alloy with
Mo is interposed as an intermediate layer, and Ti is further formed on the outside.
Or it is made of Ti alloy clad. The conductive composite busbar of the present invention is produced by hot extruding a billet of Ti or Ti alloy/Mo/Al or Al alloy, or subjecting it to heat treatment such as strain relief annealing after extrusion and annealing to increase electrical conductivity. So, Mo
acts as a diffusion preventive material for Ti and Al, and can prevent the formation of Al-Ti intermetallic compounds.
A small amount of Al dissolves into solid solution with each other, creating a strong and ductile diffusion layer, which can increase the cladding strength. Mo in the intermediate layer may be inserted in any form during manufacturing, but it is inserted in the form of a thin plate between the Ti or Ti pipe and the Al or Al alloy billet, and then it is formed into a wire or plate through a hot extrusion process. It is common to make composite busbars for conduction. (Example) Examples of the conductive composite bus bar of the present invention will be described together with conventional examples. First, to explain the conventional example, the outer diameter is 104 mm,
An Al billet with an outer diameter of 91 mm was inserted into a Ti pipe with an inner diameter of 92 mm, sealed, and then extruded at 550°C. The extrusion was 60 mm wide and 20 mm thick. Thereafter, strain relief annealing was performed at 500°C, and a bus bar was made by rolling to a width of 70 mm and a thickness of 10 mm, which was then subjected to a cold 90 degree bending test. Next, to explain the example, the outer diameter is 104 mm,
An Al billet with an outer diameter of 91 mm is inserted into a Ti pipe with an inner diameter of 92 mm, and the thickness is set between the Ti pipe and the Al billet.
After inserting a thin Mo plate of 0.1mm and sealing these
Extrusion processing was carried out at 550℃. The extrusion is 60mm wide and 20mm thick.
It was warm in mm. After that, strain relief annealing is performed at 500℃.
A Fussbar was made by rolling to a width of 70 mm and a thickness of 10 mm, and a cold 90 degree bending test was performed on this. When the cross sections of the busbars after rolling and the busbars after the bending test of the conventional examples and examples described above were observed with a metallurgical microscope, the results shown in the table below were obtained.
【表】
上記の表で判るように従来例のブスバーは、ク
ラツド強度の弱さに起因するエツジ剥離や曲げ試
験後の外被材割れ等が発生し、ブスバーとしては
使用不可能であるが、実施例のブスバーには剥離
や割れはみられず、ブスバーとして十分使用でき
る。
（発明の効果）
以上の説明で判るように本発明の導電用複合ブ
スバーは、Al又はAl合金の芯材とTi又はTi合金
の外被層の間にMoの中間層が介在されているの
で、Al又はAl合金の芯材とTi又はTi合金の外被
層のクラツド強度が極めて高く、複雑な形状に塑
性加工することが可能であるという効果があり、
しかも導電性、耐食性を兼ね備えているので、従
来の導電用複合ブスバーにとつて代わることので
きる画期的なものと言える。[Table] As can be seen from the table above, conventional busbars cannot be used as busbars due to edge peeling and cracking of the outer cover material after bending tests due to weak cladding strength. The bus bars of the examples show no peeling or cracking and can be fully used as bus bars. (Effects of the Invention) As can be seen from the above explanation, the conductive composite busbar of the present invention has an intermediate layer of Mo interposed between the core material of Al or Al alloy and the outer layer of Ti or Ti alloy. , the cladding strength of the core material of Al or Al alloy and the outer layer of Ti or Ti alloy is extremely high, and it has the effect of being able to be plastically worked into complex shapes.
Furthermore, since it has both electrical conductivity and corrosion resistance, it can be said to be an epoch-making product that can replace conventional conductive composite busbars.