JP3846664B2 - Copper alloy plate for contact parts where ON / OFF of electric circuit is repeated - Google Patents
Copper alloy plate for contact parts where ON / OFF of electric circuit is repeated Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は電気・電子部品用銅合金、特に各種スイッチ、モーターコンミュテータなど、電気回路のＯＮ−ＯＦＦが繰り返される接点部品に用いられる銅合金に関するものである。
【０００２】
【従来の技術】
スイッチ、モーターコンミュテータなど、電気回路のＯＮ−ＯＦＦが繰り返される接点部品は、強度、導電率はもちろんのこと、耐熱性（通電による発熱で軟化し難いこと）、さらにはＯＮ→ＯＦＦの動作時に起こるアーク放電で摩耗し難いことが要求される。本用途には、無酸素銅（Ｃ１０１００、Ｃ１０２００）、タフピッチ銅（Ｃ１１０００）などが高導電率を有することで用いられている。また、耐アーク摩耗性を付与したＡｇ入り無酸素銅（Ｃ１０４００、Ｃ１０５００、Ｃ１０７００）、Ａｇ入りタフピッチ銅（Ｃ１１３００、Ｃ１１４００、Ｃ１１５００、Ｃ１１６００）などが用いられている。しかし、これら（Ａｇ入り）無酸素銅及び（Ａｇ入り）タフピッチ銅は、強度及び耐熱性の不足による機械的な耐摩耗性の不足が欠点であった。
【０００３】
【発明が解決しようとする課題】
一方、特開平２−２５５３１号公報には、上記材料の機械的性質及び耐熱性を向上させ、機械的な耐摩耗性を改善した銅合金として、Ｃｕ−Ｆｅ−Ｐ−Ａｇ合金が開示されている。これは、Ｆｅ：０．０２〜０．５ｍａｓｓ％、Ｐ：０．０２〜０．１５ｍａｓｓ％、Ａｇ：０．０１〜０．３ｍａｓｓ％、残部Ｃｕ及び不可避不純物からなり、Ｆｅ２Ｐの析出により導電率を低下させることなく機械的な耐摩耗性の向上を図り、同時にＡｇの添加により耐アーク摩耗性の向上を図るというものである。しかし、このＣｕ−Ｆｅ−Ｐ−Ａｇ合金の場合、当初の導電率は高いが、接点部品として使用中に導電率が著しく低下することがあることが分かった。
【０００４】
これは、スイッチ、モーターコンミュテータなど、電気回路のＯＮ−ＯＦＦが繰り返される接点部品では、特に接点付近で温度上昇が大きく、条件によっては融点又は融点付近まで達することがあり、そのため、析出していたＦｅ２Ｐが再び固溶するためである。Ｆｅ２Ｐが固溶することにより導電率が低下すると、ジュール熱の発生が多くなり、発生したジュール熱の抜熱も遅れ、接点部品の寿命の低下をきたす。
本発明は従来技術の上記問題点に鑑みてなされたもので、強度、導電率、耐熱性、耐アーク摩耗性及び耐機械的摩耗性などが良好で、かつ通電による発熱で導電率の低下が少ない電気回路のＯＮ−ＯＦＦが繰り返される接点部品用銅合金板を得ることを目的とする。
【０００５】
【課題を解決するための手段】
本発明者は、前記課題を解決するためにＣｕ−Ａｇ−Ｆｅ−Ｐ系合金について鋭意研究した結果、Ｆｅ及びＰを微量範囲に制御することにより、上記の目的を達成できることを見い出し、本発明をなすに至った。
すなわち、本発明に係る電気回路のＯＮ−ＯＦＦが繰り返される接点部品用銅合金板は、Ａｇ：０．０１〜０．３ｍａｓｓ％、Ｆｅ：０．００５〜０．０２ｍａｓｓ％未満、Ｐ：０．００５〜０．０５ｍａｓｓ％を含み、さらに必要に応じて、Ｂ、Ｃ、Ｓ、Ｃａ、Ｖ、Ｇａ、Ｇｅ、Ｎｂ、Ｍｏ、Ｈｆ、Ｔａ、Ｂｉ、Ｐｂ、Ｂｅ、Ｍｇ、Ａｌ、Ｔｉ、Ｃｒ、Ｍｎ、Ｎｉ、Ｃｏ、Ｚｒ、Ｃｄ、Ｉｎ、Ｓｂ、Ｓｉ、Ｓｎ、Ｔｅ、Ａｕの各元素０．００１〜０．１ｍａｓｓ％並びにＺｎ：０．００１〜１ｍａｓｓ％のうちから選ばれた１種又は２種以上の元素を合計で１ｍａｓｓ％以下含有し、残部Ｃｕと不可避不純物からなる。
また、本発明に係る銅合金板は、導電率が８０％ＩＡＣＳ以上であること、さらに８００℃で３０分間焼鈍後の導電率が７０％ＩＡＣＳ以上であることを特徴とする。
【０００６】
【発明の実施の形態】
次に、本発明に係る銅合金板の成分及び導電率の限定理由について説明する。
（Ａｇ）
Ａｇは導電率をほとんど低下させずに、アーク放電による摩耗を抑制する元素である。また、強度及び耐熱性を向上させ機械的な摩耗をも抑制する効果がある。しかし、０．０１ｍａｓｓ％未満ではその効果が小さく、０．３ｍａｓｓ％を超えて含有してもその効果が飽和するとともに、コストが上昇する。従って、Ａｇは０．０１〜０．３ｍａｓｓ％とする。さらに望ましい範囲は、０．０３〜０．１５ｍａｓｓ％である。
【０００７】
（Ｆｅ及びＰ）
Ｆｅ及びＰは、化合物を形成することにより、導電率の低下を抑えつつ、強度及び耐熱性を向上させ機械的な摩耗を抑制する効果がある。しかし、いずれの元素も０．００５ｍａｓｓ％未満ではこれらの効果が小さく、Ｆｅは０．０２ｍａｓｓ％以上、Ｐは０．０５ｍａｓｓ％を超えると、通電による発熱で導電率が低くなり好ましくない。従って、Ｆｅは０．００５〜０．０２ｍａｓｓ％未満、Ｐは０．００５〜０．０５ｍａｓｓ％とする。Ｐのさらに望ましい範囲は、０．００５〜０．０２ｍａｓｓ％である。
【０００８】
（副成分）
Ｂ、Ｃ、Ｓ、Ｃａ、Ｖ、Ｇａ、Ｇｅ、Ｎｂ、Ｍｏ、Ｈｆ、Ｔａ、Ｂｉ、Ｐｂ、Ｂｅ、Ｍｇ、Ａｌ、Ｔｉ、Ｃｒ、Ｍｎ、Ｎｉ、Ｃｏ、Ｚｒ、Ｃｄ、Ｉｎ、Ｓｂ、Ｓｉ、Ｓｎ、Ｔｅ、Ａｕ、Ｚｎ等の副成分元素は、強度及び耐熱性並びに耐機械的摩耗性を一層向上させるために、導電率の許容範囲で適宜添加することができる。これらの元素は、０．００１ｍａｓｓ％未満では効果が小さく、Ｚｎ以外の各元素は０．１ｍａｓｓ％、Ｚｎは１ｍａｓｓ％を超えると、導電率の低下が顕著となり好ましくない。従って、上記元素のうちＺｎ以外の各元素は０．００１ｍａｓｓ％〜０．１ｍａｓｓ％、Ｚｎは０．００１ｍａｓｓ％〜１ｍａｓｓ％のうちから選ばれた１種又は２種以上の元素を、合計で１ｍａｓｓ％以下含有することができる。
【０００９】
（導電率）
スイッチ、モーターコンミュテータなど、電気回路のＯＮ−ＯＦＦが繰り返される接点部品は、温度上昇を防ぐことにより寿命向上が可能となる。温度上昇を防ぐためには、ジュール熱の発生を抑制するとともに、発生したジュール熱を抜熱することが重要である。そのためには導電率を８０％ＩＡＣＳ以上にすることが望ましく、それ未満では寿命の低下をきたす。さらに望ましい範囲は、８５％ＩＡＣＳ以上である。前記組成の銅合金で８０％ＩＡＣＳ以上、さらに８５％ＩＡＣＳ以上の導電率を達成することが可能である。
【００１０】
（８００℃で３０分間焼鈍後の導電率）
上記接点部品は、接点付近が最も温度上昇が大きく、条件によっては融点又は融点付近まで達することがある。その場合でも、導電率が大きく低下しないようにするために、Ｆｅ、Ｐの含有量を前記の範囲内に抑え、高温になった場合の固溶量を制限する必要がある。
高温で固溶化した時の導電率の指標として、８００℃で３０分間焼鈍後の導電率を用いたとき、この値を７０％ＩＡＣＳ以上にすることが望ましく、これ未満では接点部品の寿命の低下をきたす。前記組成の銅合金で７０％ＩＡＣＳ以上の導電率（８００℃で３０分間焼鈍後）を達成することが可能となった。
【００１１】
【実施例】
次に、本発明の実施例について、比較例とともに以下に説明する。
表１に示す化学組成の銅合金を、クリプトル炉にて木炭被覆下で大気溶解し、ブックモールドに鋳造し、５０×８０×２００ｍｍの鋳塊を作製した。この鋳塊を９００℃に加熱し熱間圧延後、直ちに水中急冷し厚さ１５ｍｍの熱延材とした。この熱延材の表面の酸化スケールを除去するため、表面をグラインダで切削した。これを冷間圧延した後、３５０〜５００℃で２時間の析出焼鈍を施した後、３０％の仕上冷間圧延を施した。このようにして板厚２．０ｍｍに調整した材料を試験に供した。
これらの供試材について、引張強さ、耐力、硬さ、耐熱性、導電率及び耐アーク摩耗性を下記要領にて調査した。
【００１２】
【表１】
＜引張強さ、耐力＞
ＪＩＳ Ｚ ２２４１に記載の方法に準じた。なお、耐力はオフセット法で永久伸び０．２％を採用した。試験片は、ＪＩＳ Ｚ ２２０１の５号試験片を用いた。
＜硬さ＞
ＪＩＳ Ｚ ２２４４に記載の方法に準じた。なお、試験荷重は５ｋｇｆとした。
＜耐熱性＞
供試材を各温度で１時間加熱した後の硬さを測定し、初期硬さの９０％になる温度を求めた。
【００１４】
＜導電率＞
ＪＩＳ Ｈ ０５０５に記載の方法に準じた。電気抵抗の測定はダブルブリッジを用いた。なお、測定は上記供試材（製品）及びその供試材を８００℃で３０分間焼鈍した材料について実施した。
＜耐アーク摩耗性＞
陰極に、根元径φ５ｍｍ、先端径φ０．７ｍｍの無酸素銅製電極を用い、陽極に各供試材を用いた。両電極を接触させ、開放電圧１２Ｖ、直流電流１００Ａの条件で電流を流しつつ、陰極を１ｍｍ／ｓの速度で開放した時の各供試材（陽極）のアーク放電による摩耗深さを測定した。
【００１５】
以上の調査結果を表２に示す。これらの結果より、本発明例のＮｏ．１〜１７はいずれの特性も良好である。ただし、Ｎｏ．１、２はＡｇが少なめで、アーク摩耗量がやや大きい。Ｎｏ．６はＦｅ、Ｐが低めで、強度及び耐熱性がやや低くなっている。Ｎｏ．７、８はＦｅ、Ｐが多めで、強度及び耐熱性がやや高くなっているが、焼鈍後の導電率がやや低くなっている。Ｎｏ．９〜１８は副成分添加により、強度及び耐熱性がやや高くなっている。
一方、比較合金Ｎｏ．１９はＡｇが少ないため、アーク摩耗量が大きい。比較合金Ｎｏ．２０はいずれの特性も良好であるが、Ｎｏ．５と比較してＡｇの増量に見合った特性の向上が認められない。比較合金Ｎｏ．２１はＦｅ／Ｐが少ないため、強度及び耐熱性が低い。比較合金Ｎｏ．２２〜２４はＦｅ又は（及び）Ｐが多いため、強度及び耐熱性が高くなっているが、Ｎｏ．２２、２３については焼鈍後の導電率が低く、Ｎｏ．２４については製品及び焼鈍後の導電率が低くなっている。Ｎｏ．２５、２６は、副成分の含有量が高く、製品の導電率及び焼鈍後の導電率が低くなっている。
【００１６】
【表２】
【発明の効果】
本発明によれば、強度、導電率、耐熱性、耐アーク摩耗性及び耐機械的摩耗性などが良好で、かつ通電による発熱で導電率の低下が少ない（電気・電子部品用、特にスイッチ、モーターコンミュテータなど、電気回路のＯＮ−ＯＦＦが繰り返される接点部品用）銅合金を得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a copper alloy for electric / electronic parts, and more particularly to a copper alloy used for contact parts in which an electric circuit is repeatedly turned on and off, such as various switches and motor commutators.
[0002]
[Prior art]
Contact parts such as switches and motor commutators that repeatedly turn on and off the electrical circuit not only have strength and conductivity, but also heat resistance (not easily softened due to heat generated by energization), and on-to-off operation It is required that it is difficult to wear due to arc discharge that sometimes occurs. In this application, oxygen-free copper (C10100, C10200), tough pitch copper (C11000), and the like are used because of high conductivity. Further, Ag-containing oxygen-free copper (C10400, C10500, C10700) imparted with arc wear resistance, Ag-containing tough pitch copper (C11300, C11400, C11500, C11600) and the like are used. However, these oxygen-free (with Ag) oxygen-free copper and (with Ag) tough pitch copper have the disadvantage of insufficient mechanical wear resistance due to insufficient strength and heat resistance.
[0003]
[Problems to be solved by the invention]
On the other hand, JP-A-2-25531 discloses a Cu—Fe—P—Ag alloy as a copper alloy that improves the mechanical properties and heat resistance of the material and improves the mechanical wear resistance. Yes. This, Fe: 0.02~0.5 mass%, P : 0.02~0.15 mass%, Ag: 0.01~0.3 mass%, the balance being Cu and unavoidable impurities, Fe 2 P Thus, the mechanical wear resistance is improved without lowering the electrical conductivity by the precipitation, and at the same time the arc wear resistance is improved by adding Ag. However, in the case of this Cu—Fe—P—Ag alloy, the initial conductivity is high, but it has been found that the conductivity may be significantly reduced during use as a contact part.
[0004]
This is because, for contact parts such as switches and motor commutators where the ON / OFF of the electric circuit is repeated, the temperature rises particularly near the contact point, and may reach the melting point or near the melting point depending on the conditions. This is because the Fe 2 P that had been dissolved again. When the electrical conductivity is lowered due to the solid solution of Fe 2 P, the generation of Joule heat increases, the heat removal of the generated Joule heat is also delayed, and the life of the contact parts is reduced.
The present invention has been made in view of the above-mentioned problems of the prior art, and has good strength, electrical conductivity, heat resistance, arc wear resistance, mechanical wear resistance, etc., and the decrease in conductivity due to heat generated by energization. An object is to obtain a copper alloy plate for contact parts in which ON / OFF of a small electric circuit is repeated .
[0005]
[Means for Solving the Problems]
As a result of intensive studies on the Cu-Ag-Fe-P-based alloy in order to solve the above problems, the present inventor has found that the above object can be achieved by controlling Fe and P to a very small range. It came to make.
That is, the copper alloy plate for contact parts in which ON / OFF of the electric circuit according to the present invention is repeated is : Ag: 0.01 to 0.3 mass %, Fe: 0.005 to less than 0.02 mass %, P: 0.005 to 0.05 mass %, and further, as required, B, C, S, Ca, V, Ga, Ge, Nb, Mo, Hf, Ta, Bi, Pb, Be, Mg, Al, Each element of Ti, Cr, Mn, Ni, Co, Zr, Cd, In, Sb, Si, Sn, Te, and Au is 0.001 to 0.1 mass % and Zn is 0.001 to 1 mass %. It contains a total of 1 mass % or less of one or more selected elements, and consists of the balance Cu and inevitable impurities.
The copper alloy sheet according to the present invention is characterized in that the electrical conductivity is 80% IACS or more, and the electrical conductivity after annealing at 800 ° C. for 30 minutes is 70% IACS or more.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, the reasons for limiting the components and conductivity of the copper alloy sheet according to the present invention will be described.
(Ag)
Ag is an element that suppresses wear due to arc discharge without substantially reducing the electrical conductivity. In addition, there is an effect of improving strength and heat resistance and suppressing mechanical wear. However, if the content is less than 0.01 mass %, the effect is small. Even if the content exceeds 0.3 mass %, the effect is saturated and the cost increases. Therefore, Ag is set to 0.01 to 0.3 mass %. A more desirable range is 0.03 to 0.15 mass %.
[0007]
(Fe and P)
Fe and P have the effect of improving strength and heat resistance and suppressing mechanical wear while suppressing a decrease in conductivity by forming a compound. However, when any element is less than 0.005 mass %, these effects are small, and when Fe exceeds 0.02 mass % and P exceeds 0.05 mass %, the heat generation due to energization lowers the conductivity, which is not preferable. . Therefore, Fe is 0.005 to less than 0.02 mass %, and P is 0.005 to 0.05 mass %. A more desirable range of P is 0.005 to 0.02 mass %.
[0008]
(Subcomponent)
B, C, S, Ca, V, Ga, Ge, Nb, Mo, Hf, Ta, Bi, Pb, Be, Mg, Al, Ti, Cr, Mn, Ni, Co, Zr, Cd, In, Sb, Subcomponent elements such as Si, Sn, Te, Au, and Zn can be appropriately added within the allowable range of conductivity in order to further improve the strength, heat resistance, and mechanical wear resistance. If these elements are less than 0.001 mass %, the effect is small, and if each element other than Zn is 0.1 mass % and Zn exceeds 1 mass %, the decrease in the conductivity is remarkable, which is not preferable. Therefore, each element other than Zn among the elements 0.001 mass% ~0.1 mass%, Zn is one or more elements selected from among 0.001 mass% ~1 mass% In total, it can be contained in an amount of 1 mass % or less.
[0009]
(conductivity)
Contact parts such as switches and motor commutators where the electrical circuit is repeatedly turned on and off can be improved in life by preventing temperature rise. In order to prevent temperature rise, it is important to suppress the generation of Joule heat and to remove the generated Joule heat. For that purpose, it is desirable that the electrical conductivity is 80% IACS or more, and if it is less than that, the life is shortened. A more desirable range is 85% IACS or more. It is possible to achieve a conductivity of 80% IACS or more, and further 85% IACS or more with the copper alloy having the above composition.
[0010]
(Conductivity after annealing at 800 ° C for 30 minutes)
The contact part has the largest temperature rise near the contact point, and may reach the melting point or near the melting point depending on conditions. Even in such a case, in order to prevent the electrical conductivity from greatly decreasing, it is necessary to limit the content of Fe and P within the above range and limit the amount of solid solution when the temperature becomes high.
When the conductivity after annealing at 800 ° C. for 30 minutes is used as an index of conductivity when solidified at a high temperature, this value is desirably 70% IACS or more. Bring It was possible to achieve a conductivity of 70% IACS or higher (after annealing at 800 ° C. for 30 minutes) with the copper alloy having the above composition.
[0011]
【Example】
Next, examples of the present invention will be described below together with comparative examples.
A copper alloy having the chemical composition shown in Table 1 was melted in the atmosphere under a charcoal coating in a kryptor furnace, and cast into a book mold to produce a 50 × 80 × 200 mm ingot. The ingot was heated to 900 ° C., hot-rolled, and immediately quenched in water to obtain a hot-rolled material having a thickness of 15 mm. In order to remove the oxide scale on the surface of the hot rolled material, the surface was cut with a grinder. This was cold-rolled and then subjected to precipitation annealing at 350 to 500 ° C. for 2 hours, followed by 30% finish cold rolling. The material thus adjusted to a plate thickness of 2.0 mm was subjected to the test.
About these test materials, tensile strength, proof stress, hardness, heat resistance, electrical conductivity, and arc wear resistance were investigated as follows.
[0012]
[Table 1]
<Tensile strength, yield strength>
The method described in JIS Z 2241 was followed. In addition, the proof stress employ | adopted permanent elongation 0.2% by the offset method. As the test piece, a JIS Z 2201 No. 5 test piece was used.
<Hardness>
In accordance with the method described in JIS Z 2244. The test load was 5 kgf.
<Heat resistance>
The hardness after heating the sample material at each temperature for 1 hour was measured, and the temperature at which the initial hardness was 90% was determined.
[0014]
<Conductivity>
The method described in JIS H 0505 was followed. A double bridge was used to measure the electrical resistance. In addition, the measurement was implemented about the said test material (product) and the material which annealed the test material at 800 degreeC for 30 minutes.
<Arc wear resistance>
An oxygen-free copper electrode having a root diameter of φ5 mm and a tip diameter of φ0.7 mm was used for the cathode, and each test material was used for the anode. The wear depth by arc discharge of each specimen (anode) when the cathode was opened at a speed of 1 mm / s was measured while the electrodes were brought into contact with each other and the current was passed under the conditions of an open voltage of 12 V and a direct current of 100 A. .
[0015]
The above survey results are shown in Table 2. From these results, No. of the present invention example. Nos. 1 to 17 have good characteristics. However, no. 1 and 2 have a small amount of Ag and a little large arc wear. No. No. 6 has lower Fe and P, and has slightly lower strength and heat resistance. No. 7 and 8 have more Fe and P, and the strength and heat resistance are slightly high, but the conductivity after annealing is slightly low. No. Nos. 9 to 18 are slightly higher in strength and heat resistance due to the addition of subcomponents.
On the other hand, Comparative Alloy No. Since 19 has less Ag, the arc wear amount is large. Comparative Alloy No. No. 20 has good characteristics, but no. Compared to 5, no improvement in characteristics commensurate with the increase in Ag was observed. Comparative Alloy No. No. 21 has low Fe / P, so its strength and heat resistance are low. Comparative Alloy No. Nos. 22 to 24 have high Fe and / or P, so the strength and heat resistance are high. Nos. 22 and 23 have low electrical conductivity after annealing. About 24, the electrical conductivity after a product and annealing is low. No. In Nos. 25 and 26, the content of subcomponents is high, and the electrical conductivity of the product and the electrical conductivity after annealing are low.
[0016]
[Table 2]
【The invention's effect】
According to the present invention, strength, electrical conductivity, heat resistance, arc wear resistance, mechanical wear resistance, etc. are good, and there is little decrease in electrical conductivity due to heat generated by energization (for electrical and electronic parts, especially switches, A copper alloy (for contact parts in which an electric circuit is repeatedly turned on and off, such as a motor commutator) can be obtained.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23507598A JP3846664B2 (en) | 1998-08-21 | 1998-08-21 | Copper alloy plate for contact parts where ON / OFF of electric circuit is repeated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23507598A JP3846664B2 (en) | 1998-08-21 | 1998-08-21 | Copper alloy plate for contact parts where ON / OFF of electric circuit is repeated |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000063968A JP2000063968A (en) | 2000-02-29 |
| JP3846664B2 true JP3846664B2 (en) | 2006-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23507598A Expired - Lifetime JP3846664B2 (en) | 1998-08-21 | 1998-08-21 | Copper alloy plate for contact parts where ON / OFF of electric circuit is repeated |
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| Country | Link |
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| JP (1) | JP3846664B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749699B2 (en) * | 2000-08-09 | 2004-06-15 | Olin Corporation | Silver containing copper alloy |
| JP4583564B2 (en) * | 2000-09-04 | 2010-11-17 | 株式会社フルヤ金属 | Wiring, electrodes and contacts |
| JP4455871B2 (en) * | 2003-12-24 | 2010-04-21 | 株式会社神戸製鋼所 | Electrical relay contact material and electrical relay contact |
| RU2582830C1 (en) * | 2014-12-16 | 2016-04-27 | Дмитрий Андреевич Михайлов | Cold-rolled profile for collectors of electric machines |
| CN109971994A (en) * | 2019-05-16 | 2019-07-05 | 杭州辰卓科技有限公司 | A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique |
| CN111575527A (en) * | 2020-05-29 | 2020-08-25 | 河北工业大学 | Preparation method of composite contact material for high-breaking low-voltage electric appliance |
| CN114086026A (en) * | 2021-10-11 | 2022-02-25 | 铜陵精达新技术开发有限公司 | Conductor wire for photovoltaic inverter and preparation method thereof |
-
1998
- 1998-08-21 JP JP23507598A patent/JP3846664B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| JP2000063968A (en) | 2000-02-29 |
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