JP2003147407A - Electric contact, its manufacturing method, and vacuum valve and vacuum circuit breaker using the same - Google Patents
Electric contact, its manufacturing method, and vacuum valve and vacuum circuit breaker using the sameInfo
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- JP2003147407A JP2003147407A JP2001343067A JP2001343067A JP2003147407A JP 2003147407 A JP2003147407 A JP 2003147407A JP 2001343067 A JP2001343067 A JP 2001343067A JP 2001343067 A JP2001343067 A JP 2001343067A JP 2003147407 A JP2003147407 A JP 2003147407A
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- Prior art keywords
- contact member
- highly conductive
- powder
- conductive metal
- vacuum
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、新規な電気接点部
材とその製造法及びそれを用いた真空バルブ並びに真空
遮断器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel electric contact member, a method for manufacturing the same, a vacuum valve and a vacuum circuit breaker using the same.
【０００２】[0002]
【従来の技術】真空遮断器等に設置される真空バルブ内
の電極構造は、一対の固定側電極及び可動側電極から成
っている。上記固定側及び可動側電極の構造は、電気接
点と該電気接点に連なる電極棒からなり、該電気接点の
裏面にはしぱしばステンレス等の板が補強板として設け
られる。2. Description of the Related Art An electrode structure in a vacuum valve installed in a vacuum circuit breaker or the like is composed of a pair of a fixed side electrode and a movable side electrode. The structure of the fixed side electrode and the movable side electrode is composed of an electric contact and an electrode rod connected to the electric contact, and a plate such as stainless steel is often provided as a reinforcing plate on the back surface of the electric contact.
【０００３】大電流、高電圧遮断用電気接点部材として
は、Cr-Cuの複合金属材料が多く用いられる。この電気
接点の製造方法は、各成分の金属粉末あるいはこれらの
混合粉を所定の組成で、例えば円板等の単純形状に成形
後、焼結するいわゆる粉末冶金法により製造された電気
接点部材を、更に機械加工して所定形状とする。なお、
電気接点には発生したアークに駆動力を与えて、アーク
を一個所に停滞させずに電極の外周部へ移動させるため
の３本以上のスリット溝が設けられ、羽根型に分離され
た形状を有する。また、電気接点の中央でアークが発生
して停滞しないように、電気接点の中央には凹部が設け
てある。Cr-Cu composite metal materials are often used as electrical contact members for breaking large currents and high voltages. This method for producing an electrical contact is an electrical contact member produced by a so-called powder metallurgy method in which metal powder of each component or a mixed powder thereof is molded into a simple shape such as a disk with a predetermined composition and then sintered. Then, it is further machined into a predetermined shape. In addition,
The electric contact is provided with three or more slit grooves for applying a driving force to the generated arc and moving the arc to the outer peripheral part of the electrode without stagnation in one place. Have. In addition, a recess is provided in the center of the electrical contact so that an arc is not generated and stays in the center of the electrical contact.
【０００４】上述した電気接点は、高電圧、大電流を開
閉遮断するために直接アークにさらされる。電気接点に
要求される特性は、遮断容量が大きいこと、耐電圧値が
高いこと、耐溶着性に優れることなどが挙げられるが、
これらの特性を全て満足することは困難であって、一般
には用途に応じて特に重要な特性を重視し、他の特性は
ある程度犠牲にした材料が用いられる。The above-mentioned electrical contacts are directly exposed to the arc in order to open and close high voltage and large current. Characteristics required for electrical contacts include high breaking capacity, high withstand voltage value, and excellent welding resistance.
It is difficult to satisfy all of these characteristics, and in general, a material in which particularly important characteristics are emphasized according to the application and other characteristics are sacrificed to some extent is used.
【０００５】例えば、Cr-Cuの複合金属材料において、
遮断容量を大きくするためには導電率が大きいことが必
要であり、Cuを多くした組成とすることで対処できる
が、耐電圧性能を上げる成分であるCrが減るため耐電圧
値は低くなり、耐溶着性も低下する。For example, in a Cr-Cu composite metal material,
In order to increase the breaking capacity, it is necessary to have high conductivity, and it can be dealt with by increasing the composition with Cu, but since the amount of Cr, which is a component that increases the withstand voltage performance, decreases, the withstand voltage value decreases, The welding resistance is also reduced.
【０００６】特開平9-213153号公報には、耐アーク性成
分のCrと、高導電性成分としてCu又はAgの少なくとも１
種と、Al又はSiの少なくとも１種を0.02〜1.0重量%との
混合粉を非酸化性雰囲気中で焼結する真空遮断器用接点
材料について示されている。Japanese Unexamined Patent Publication No. 9-213153 discloses that at least one of Cr as an arc resistant component and Cu or Ag as a highly conductive component.
Seed and contact material for vacuum circuit breaker, which is obtained by sintering a mixed powder of 0.02 to 1.0% by weight of at least one of Al and Si in a non-oxidizing atmosphere.
【０００７】特開2000-188045号公報には、耐火性金属
のCrと、高導電性金属としてCu、Ag及びAuの少なくとも
１種と、Nb、Si、Ti、Zr、Hf、V、Ta、Mo、W、Fe、Co、
Ni及びMnの少なくとも１種を1〜13重量%とを有する電極
材が高導電性金属の溶浸によって形成された真空遮断器
用接点材料について示されている。In Japanese Patent Laid-Open No. 2000-188045, refractory metal Cr, at least one of Cu, Ag and Au as a highly conductive metal, Nb, Si, Ti, Zr, Hf, V, Ta, Mo, W, Fe, Co,
An electrode material having at least one of Ni and Mn in an amount of 1 to 13% by weight is shown for a contact material for a vacuum circuit breaker formed by infiltration of a highly conductive metal.
【０００８】[0008]
【発明が解決しようとする課題】年々、配電の高電圧化
が進む中、真空遮断器あるいは真空開閉器等において
も、大電流遮断と高耐電圧特性及び耐溶着性能の両立が
求められるようになった。例えばCr- Cu複合金属材料を
電気接点に用いる場合には、Cr量を多くすることで耐電
圧値と耐溶着性を向上させることができる。しかし、Cr
量を多くすると導電率は低下し、遮断性能が不十分とな
り、大電流遮断性能と高耐電圧特性及び耐溶着性能を両
立するのは極めて困難であった。As the voltage of power distribution is becoming higher and higher year by year, even in vacuum circuit breakers, vacuum switchgear, etc., it is required that large current interruption and high withstand voltage characteristics and welding resistance are compatible. became. For example, when a Cr-Cu composite metal material is used for an electrical contact, the withstand voltage value and the welding resistance can be improved by increasing the amount of Cr. But Cr
If the amount is increased, the conductivity is lowered and the breaking performance becomes insufficient, and it has been extremely difficult to achieve both the large current breaking performance and the high withstand voltage characteristics and the welding resistance performance.
【０００９】本発明者らは、ガス成分を吸着する、いわ
ゆるゲッター材の役目を持つ元素が、比較的融点の低い
高導電性金属からなるマトリックス中に含まれることに
より、遮断性能が安定するとともに、耐電圧特性及び耐
溶着性能が向上することを見出した。The inventors of the present invention stabilize the barrier performance by containing an element that adsorbs a gas component and has a function of a so-called getter material in a matrix made of a highly conductive metal having a relatively low melting point. It has been found that the withstand voltage characteristics and the welding resistance performance are improved.
【００１０】又、上述の公報の焼結合金においては、高
導電性金属に対して他の金属を混合するものであり、他
の金属によるゲッター作用が低いこと、溶浸合金におい
ては焼結合金に比較してゲッター作用が低い。Further, in the sintered alloy of the above-mentioned publication, another metal is mixed with a highly conductive metal, and the getter action by the other metal is low. In the infiltration alloy, the sintered alloy is used. The getter effect is low compared to.
【００１１】本発明の目的は、ゲッター作用が高く、安
定した遮断性能と、耐電圧特性及び耐溶着性能を兼ね備
え、生産性に優れた電気接点部材とその製造法及びそれ
を用いた真空バルブ並びに真空遮断器を提供することに
ある。An object of the present invention is to provide an electrical contact member having a high getter action, stable breaking performance, and withstand voltage characteristics and welding resistance, and having excellent productivity, a manufacturing method thereof, a vacuum valve using the same, and To provide a vacuum circuit breaker.
【００１２】[0012]
【課題を解決するための手段】本発明は、高導電性合金
粉末と耐火性金属粉末との混合粉末によって焼結された
焼結合金からなることを特徴とする電気接点部材にあ
る。The present invention resides in an electrical contact member comprising a sintered alloy sintered by a mixed powder of a highly conductive alloy powder and a refractory metal powder.
【００１３】又、本発明は、高導電性金属からなるマト
リックス中に耐火性金属粒子が分散した焼結合金からな
り、前記高導電性金属は溶融合金からなることを特徴と
する電気接点部材にある。Further, the present invention provides an electrical contact member comprising a sintered alloy in which refractory metal particles are dispersed in a matrix made of a highly conductive metal, and the highly conductive metal is made of a molten alloy. is there.
【００１４】より具体的には、本発明の電気接点部材
は、高導電性金属からなるマトリックス中に耐火性金属
粉が分散する組織を成し、前記耐火性金属粉はCr、W、M
o、Ta、Nb、Be、Hf、Ir、Pt、Zr、Ti、S1、Rh及びRuの
１種又は２種以上の混合物あるいはこれらの化合物から
なり、前記高導電性金属にはCu,Au,Agが用いられ、特に
主成分がCuで、Mg、A1、Ti、Cr、Zr、Sn、Zn、Ni、Co、
Fe、Mn及びSiの１種又は２種以上を含む溶融合金からな
るものである。More specifically, the electric contact member of the present invention has a structure in which refractory metal powder is dispersed in a matrix made of a highly conductive metal, and the refractory metal powder is Cr, W, M.
o, Ta, Nb, Be, Hf, Ir, Pt, Zr, Ti, S1, Rh and Ru, or a mixture of two or more thereof, or a compound thereof, and the highly conductive metal includes Cu, Au, Ag is used, especially the main component is Cu, Mg, A1, Ti, Cr, Zr, Sn, Zn, Ni, Co,
It is composed of a molten alloy containing one or more of Fe, Mn and Si.
【００１５】また、本発明の電気接点部材は、15〜40重
量%の前記耐火性金属粉と、60〜85重量%の前記高導電性
金属からなるもの、さらに、本発明の電気接点部材は、
含有酸素量が好ましくは2500ppm以下であり、比抵抗は
好ましくは5.5μΩ・Cm以下より好ましくは4.0〜5.5μ
Ω・Cmを有するものである。The electrical contact member of the present invention comprises 15 to 40% by weight of the refractory metal powder and 60 to 85% by weight of the highly conductive metal, and the electrical contact member of the present invention is ,
The oxygen content is preferably 2500 ppm or less, and the specific resistance is preferably 5.5 μΩ · Cm or less, more preferably 4.0 to 5.5 μm.
It has Ω · Cm.
【００１６】本発明は、（Ａ）耐火性金属としてBe、l
r、Pt、Rh及びRuの１種又は２種以上と、高導電性金属
として主成分がCuで、Mg、A1、Cr、Sn、Zn及びNiの１種
又は２種以上を含む溶融合金との組み合せ、更に、
（Ｂ）耐火性金属としてCr、W、Mo、Ta、Nb、Hf、Zr、T
i及びSi の１種又は２種以上と、高導電性金属として主
成分がCuで、Ti、Zr、Co、Fe、Mn及びSiの１種又は２種
以上を含む溶融合金との組み合せとするものである。The present invention provides (A) a refractory metal such as Be, l
1 or 2 or more of r, Pt, Rh and Ru, and a molten alloy containing Cu as a main component as a highly conductive metal and 1 or 2 or more of Mg, A1, Cr, Sn, Zn and Ni. Combination of
(B) Cr, W, Mo, Ta, Nb, Hf, Zr, T as refractory metal
A combination of one or two or more of i and Si and a molten alloy containing Cu as a main component as a highly conductive metal and one or more of Ti, Zr, Co, Fe, Mn and Si. It is a thing.
【００１７】（Ａ）の組み合せは、耐火性金属は比較的
硬質で、耐溶着性の改善に（Ｂ）の組み合せよりも効果
が大である。（Ａ）の高導電性金属の合金は、金属学的
に組成の制御が比較的容易で任意の組成が得られ易いこ
と、工業的に生産が容易で安価に製造が可能である。ま
た、高導電性金属の原料としてアトマイズ粉末の生産が
容易で、アトマイズ粉末粒子ごとの組成のばらつきを比
較的小さくできる。The combination (A) is relatively hard in the refractory metal, and is more effective than the combination (B) in improving the welding resistance. The highly conductive metal alloy (A) is relatively easy to control the composition metallurgically and easily obtains an arbitrary composition, and is industrially easy to manufacture and inexpensive to manufacture. Further, it is easy to produce atomized powder as a raw material of a highly conductive metal, and it is possible to make the composition variation among atomized powder particles relatively small.
【００１８】耐火性金属の含有量が15〜20重量％の場合
は、電気接点部材の導電率を高く維持できるため、大電
流を流しても内部抵抗が小さく、電力損失、ジュール発
熱等が小さいため、大電流型真空バルブに適する。ま
た、耐火性金属の含有量が20〜40重量％の場合では硬質
で耐電圧成分である耐火性金属が比較的多くなり、高電
圧回路において電流遮断しても、開極後の電極剛におい
て再点弧、再発弧が生じにくく、高電圧型真空バルブに
適する。When the content of the refractory metal is 15 to 20% by weight, the electrical conductivity of the electric contact member can be kept high, so that the internal resistance is small and the power loss and Joule heat generation are small even when a large current is applied. Therefore, it is suitable for a large current type vacuum valve. Further, when the content of the refractory metal is 20 to 40% by weight, the amount of the refractory metal that is hard and is a withstand voltage component becomes relatively large, and even if the current is cut off in the high voltage circuit, the electrode stiffening after the opening is performed. Re-ignition and re-ignition hardly occur, making it suitable for high-voltage vacuum valves.
【００１９】本発明の電気接点部材は、真空バルブにお
ける一対の固定側電極及び可動側電極を構成する部材と
して用いられ、この真空バルブは真空遮断器、真空開閉
器等に用いられるものである。The electrical contact member of the present invention is used as a member constituting a pair of fixed-side electrode and movable-side electrode in a vacuum valve, and this vacuum valve is used in a vacuum circuit breaker, a vacuum switch or the like.
【００２０】本発明の電気接点部材は、高導電性金属か
らなるマトリックス中に耐火性金属粉が分散する組織を
有するものである。ここで、耐火性金属粉はCr、W、M
o、Ta、Nb、Be、Hf、Ir、Pt、Zr、Ti、Si、Rh及びRUの
１種叉は２種以上の混合物あるいはこれらの化合物であ
ることが望ましい。これらの比較的高融点の金属粉が分
散することにより、電気接点部材に耐電圧性能を持たせ
ることができる。The electrical contact member of the present invention has a structure in which refractory metal powder is dispersed in a matrix made of a highly conductive metal. Here, the refractory metal powder is Cr, W, M
It is desirable that one or a mixture of two or more of o, Ta, Nb, Be, Hf, Ir, Pt, Zr, Ti, Si, Rh and RU or a compound thereof is used. By dispersing these metal powders having a relatively high melting point, the electric contact member can have withstand voltage performance.
【００２１】また、高導電性金属は特に主成分がCuで、
第２成分としてMg、Al、Ti、Cr、Zr、Sn、Zn、Ni、Co、
Fe、Mn及びSiの１種又は２種以上を好ましくは0.3〜5.0
重量％、より好ましくは0.5〜3.0重量％含む溶融合金と
するものである。電流遮断時のアーク加熱によって溶融
分解された第２成分元素は、酸素等のガスを吸収し、い
わゆるゲッター作用がより有効になり、アーク周辺のガ
スを減少させ、アークの消弧作用を高めることにより遮
断性能を安定化させることができる。さらには、酸素等
のガスを吸収した第２成分元素は酸化物等の化合物を生
成し、この化合物は比較的硬質かつ高融点であり、この
化合物が微細に電気接点表面に分散することにより、耐
電圧特性及び耐溶着性能を高めることができる。The main component of the highly conductive metal is Cu,
As the second component, Mg, Al, Ti, Cr, Zr, Sn, Zn, Ni, Co,
One or more of Fe, Mn and Si are preferably 0.3 to 5.0
It is a molten alloy containing wt%, more preferably 0.5 to 3.0 wt%. The second component element melted and decomposed by the arc heating at the time of electric current interruption absorbs gas such as oxygen, so that the so-called getter action becomes more effective, the gas around the arc is reduced, and the arc extinguishing action of the arc is enhanced. This makes it possible to stabilize the blocking performance. Furthermore, the second component element that has absorbed a gas such as oxygen produces a compound such as an oxide, and this compound is relatively hard and has a high melting point. By finely dispersing this compound on the surface of the electrical contact, Withstand voltage characteristics and welding resistance performance can be improved.
【００２２】耐火性金属粉と高導電性金属との配合比
は、耐火性金属を15〜40重量%、高導電性金属を60〜85
重量%とすることで、遮断性能及び耐電圧特性のバラン
スを保ち、健全な材料組織をもつ電気接点部材が得られ
る。この電気接点部材の含有酸素量は2500ppm以下とす
ることで、電流遮断時のガスの放出を抑制し、ガスを介
したアーク持続による遮断不能を防止することができ
る。The mixing ratio of the refractory metal powder and the highly conductive metal is 15 to 40% by weight of the refractory metal and 60 to 85% of the highly conductive metal.
By adjusting the weight percentage, an electric contact member having a sound material structure and maintaining a balance between the breaking performance and the withstand voltage characteristics can be obtained. By setting the amount of oxygen contained in this electrical contact member to be 2500 ppm or less, it is possible to suppress the release of gas when the current is interrupted and prevent the inability to interrupt the arc due to the continuation of the gas.
【００２３】また、この電気接点部材の比抵抗は5.5μ
Ω・cm以下であることが望ましく、この比低抗値を有す
ることで、良好な遮断性能を維持することができる、高
導電性金属における第２成分の含有量は、この比抵抗値
になるように調整されることが望ましいが、その量は第
２成分元素によって異なるものである。The specific resistance of this electrical contact member is 5.5 μm.
Ω · cm or less is desirable, and by having this specific resistance value, the content of the second component in the highly conductive metal that can maintain good blocking performance becomes this specific resistance value. It is desirable that the amount be adjusted according to the second component element.
【００２４】本発明の電気接点部材の製法は、前記耐火
性金属粉と前記高導電性金属からなる粉末との混合粉末
を、圧力120〜500MPaで加圧成形して成形体を作製し、
該成形体を真空中または不活性雰囲気中において前記高
導電性金属の融点以下で焼結するものである。The method for producing the electrical contact member of the present invention is to produce a compact by pressure molding a mixed powder of the refractory metal powder and the powder of the highly conductive metal at a pressure of 120 to 500 MPa.
The compact is sintered in a vacuum or in an inert atmosphere at a temperature not higher than the melting point of the highly conductive metal.
【００２５】成形圧力が120MPaより小さいと成形密度が
小さくなり成形体が崩れやすく、500MPaより大きいと金
型寿命が短くなり生産性も低下する恐れがある。また、
真空中又は不活性雰囲気中において焼結することによ
り、健全な焼結組織と適正なガス含有量が得られる。If the molding pressure is less than 120 MPa, the molding density tends to be small and the molded body tends to collapse. If it exceeds 500 MPa, the die life may be shortened and productivity may be reduced. Also,
By sintering in vacuum or in an inert atmosphere, a healthy sintered structure and proper gas content can be obtained.
【００２６】上記の高導電性金属からなる粉末の粒径
は、80μm以下とすることが望ましい。高導電性金属粉
末の粒径がこれより大きいと、耐火性金属粉が凝集する
傾向にあり、均一に分散させることが困難になる。ま
た、高密度が得られず、比抵抗が大きくなる。なお、焼
結後の電気接点部材を成形過程と同方向に圧力400MPa以
上で加圧することも可能で、これにより電気接点部材が
緻密化され、電極性能の安定化につながる。また、高導
電性金属粉末に、主成分であるCuと第２成分とを合金化
したアトマイズ粉末を用いることが好ましく、これによ
り第２成分がCu中に均一に分散、固溶し、性能が安定化
するとともに、流動性に優れた原料粉末が得られ、生産
性が向上する。The particle size of the powder made of the above-mentioned highly conductive metal is preferably 80 μm or less. If the particle size of the highly conductive metal powder is larger than this, the refractory metal powder tends to agglomerate, which makes it difficult to uniformly disperse it. In addition, high density cannot be obtained and the specific resistance increases. It is also possible to press the electric contact member after sintering at a pressure of 400 MPa or more in the same direction as in the molding process, whereby the electric contact member is densified and the electrode performance is stabilized. Further, it is preferable to use atomized powder in which Cu as a main component and a second component are alloyed with the highly conductive metal powder, whereby the second component is uniformly dispersed and solid-dissolved in Cu, and the performance is improved. A stable raw material powder having excellent fluidity is obtained, and productivity is improved.
【００２７】[0027]
【発明の実施の形態】（実施例１）本発明に関する第1
実施例として、耐火性金属粉にCr、高導電性金属に数種
のCu合金を用い、耐火性金属粉と高導電性金属との重量
比を25:75とした電気接点部材を作製した。また、比較
のために、高導電性金属として第２成分を含まないCuを
用いた25Cr-75Cuの電気接点部材も併せて作製した。こ
れらの電気接点部材の製造方法は次の通りである。BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) First Embodiment of the Present Invention
As an example, an electrical contact member was prepared in which Cr was used as the refractory metal powder and several Cu alloys were used as the highly conductive metal, and the weight ratio of the refractory metal powder and the highly conductive metal was 25:75. For comparison, an electrical contact member of 25Cr-75Cu using Cu containing no second component as a highly conductive metal was also produced. The method of manufacturing these electric contact members is as follows.
【００２８】用いたCr粉末には酸素が1100ppm、A1が800
ppm、Siが440ppm含まれており、粒径は104μm以下であ
る、また、Cu合金粉末としては、Cu-Si、Cu-Zr、Cu-N
i、Cu-A1の4種類とし、それぞれCUに対する第２成分の
配合比は2重量%である。これらCu合金粉末にはアトマイ
ズ粉を用い、比較用のCu粉末には電解粉を用いた。な
お、Cu合金粉末及びCu粉末には、粒径が80μm以下のも
のと80μm以上のものを用いた。The Cr powder used was 1100 ppm oxygen and 800 A1.
ppm, Si is contained 440ppm, the particle size is 104μm or less, also, as the Cu alloy powder, Cu-Si, Cu-Zr, Cu-N
There are four types, i and Cu-A1, and the compounding ratio of the second component to CU is 2% by weight. Atomized powder was used as the Cu alloy powder, and electrolytic powder was used as the Cu powder for comparison. As the Cu alloy powder and the Cu powder, those having a particle size of 80 μm or less and those having a particle size of 80 μm or more were used.
【００２９】まず、上記のCr粉末とCu合金粉末あるいは
Cu粉末とを、重量比で25:75の割合にV型混合器で混合し
た。次にこの混合粉を、直径60mmの金型に充填し、油圧
プレスにより250MPaの圧力を直径60mmの円面にかけて加
圧成形した。成形体の寸法は直径60mm×厚さ12mmで、相
対密度はいずれもおよそ73%であった。これを6.7×10-3
Pa以下の真空中で1050℃×120分間加熱し、電気接点部
材を作製した。First, the above-mentioned Cr powder and Cu alloy powder or
Cu powder was mixed with a V-type mixer at a weight ratio of 25:75. Next, this mixed powder was filled in a mold having a diameter of 60 mm and pressure-molded by applying a pressure of 250 MPa to a circular surface having a diameter of 60 mm with a hydraulic press. The dimensions of the molded body were 60 mm in diameter and 12 mm in thickness, and the relative density was about 73% in each case. This is 6.7 × 10 -3
It was heated at 1050 ° C for 120 minutes in a vacuum of Pa or less to produce an electric contact member.
【００３０】作製した電気接点部材の組成、密度、比抵
抗を表１に示す。25Cr-75 Cu(試料A1、A2)に比べて、高
導電性金属に第２成分が含まれる場合(試料B1〜E2)に
は、マトリックス中に第２成分が分散、固溶しているた
め、比抵抗は大きくなる傾向を示す。また、Cuの焼結が
進みにくくなるため、密度は比較的小さくなる。特に、
高導電性金属粉末の粒径が80μm以上の場合、比低抗が
5.5μΩ・cm以上と大きくなることがあり(試料B2、C2、D
2)、通電時の発熱量が大きくなり、電極の溶着につなが
りやすく、好ましくない。以上から、高導電性金属粉末
の粒径は80μm以下が望ましいことが証明された。Table 1 shows the composition, density, and specific resistance of the electrical contact member produced. Compared to 25Cr-75 Cu (Samples A1 and A2), when the second component is contained in the highly conductive metal (Samples B1 to E2), the second component is dispersed and solid-solved in the matrix. , The specific resistance tends to increase. Moreover, since the sintering of Cu becomes difficult to proceed, the density becomes relatively small. In particular,
When the particle size of highly conductive metal powder is 80 μm or more,
May be as large as 5.5 μΩcm or more (Samples B2, C2, D
2) The amount of heat generated during energization is large, which easily leads to electrode welding, which is not preferable. From the above, it was proved that the particle size of the highly conductive metal powder is preferably 80 μm or less.
【００３１】[0031]
【表１】 [Table 1]
【００３２】なお、以上の傾向は、耐火性金属がCr以外
のW、Mo、Ta、Nb、Be、Hf、Ir、Pt、Zr、Ti、Si、Rh及び
Ruの１種又は２種以上の混合物あるいはこれらの化合物
であり、高導電性金属の第２成分がSi、Zr、Ni、A1以外
のMg、Ti、Cr、Sn、Zn、Co、Fe及びMnの１種又は２種以
上を含む溶融合金である場合にも同様であることが確認
された。The above tendency shows that the refractory metals other than Cr are W, Mo, Ta, Nb, Be, Hf, Ir, Pt, Zr, Ti, Si, Rh and
One or a mixture of two or more kinds of Ru, or a compound thereof, in which the second component of the highly conductive metal is Si, Zr, Ni, Mg other than A1, Mg, Ti, Cr, Sn, Zn, Co, Fe and Mn. It was confirmed that the same applies to the case of a molten alloy containing one or more of the above.
【００３３】（実施例２）本実施例では、実施例１で作
製した電気接点部材を用いて、真空バルブに適用するた
めの電極を作製した。図１は、作製した電極の構造を示
す図である。図１において、電極は、電気接点１、アー
クに駆動力を与えて停滞させないようにするためのスパ
イラル溝２、ステンレス製の補強板３、電極棒４、ろう
材５を有する。Example 2 In this example, the electric contact member produced in Example 1 was used to produce an electrode for use in a vacuum valve. FIG. 1 is a diagram showing the structure of the produced electrode. In FIG. 1, the electrode has an electric contact 1, a spiral groove 2 for applying a driving force to the arc so as not to stagnate, a reinforcing plate 3 made of stainless steel, an electrode rod 4, and a brazing material 5.
【００３４】電極の作製方法は次の通りである。実施例
１で作製した電気接点部材を機械加工により、所望形状
に加工して電気接点1を得る。電極棒4を無酸素銅で、ま
た、補強板3をSUS304であらかじめ機械加工により作製
しておき、電気接点1及び補強板3の中央孔と電極棒4の
凸部とを、ろう材5を介して嵌め合わせ、また電気接点1
と補強板3との問にもろう材5を載置し、これを8.2×10
−４Pa以下の真空中で980℃×8分間加熱し、図１に示す
電極を作製した。なお、この電極は定格電圧7.2kV、定
格電流600A、定格遮断電流20kA用の真空バルブに用いら
れる電極である。The method for producing the electrode is as follows. The electrical contact member produced in Example 1 is machined into a desired shape to obtain the electrical contact 1. The electrode rod 4 is made of oxygen-free copper, and the reinforcing plate 3 is previously machined from SUS304 by machining, and the central hole of the electrical contact 1 and the reinforcing plate 3 and the convex portion of the electrode rod 4 are brazed. Mating through, also electrical contact 1
Place the brazing material 5 on the question of the reinforcement plate 3 and 8.2 × 10
The electrode shown in FIG. 1 was produced by heating at 980 ° C. for 8 minutes in a vacuum of −4 Pa or less. This electrode is used in a vacuum valve for a rated voltage of 7.2 kV, a rated current of 600 A and a rated breaking current of 20 kA.
【００３５】（実施例３）本実施例では、実施例２で作
製した電極を搭載した真空バルブを作製した。真空バル
ブの仕様は、定格電圧7.2kV、定格電流600A、定格遮断
電流20kAである。(Example 3) In this example, a vacuum valve equipped with the electrode prepared in Example 2 was manufactured. The specifications of the vacuum valve are a rated voltage of 7.2kV, a rated current of 600A and a rated breaking current of 20kA.
【００３６】図２は、本実施例に係わる真空バルブの構
造を示す図である。図２において、1a、1bはそれぞれ固
定側電気接点、可動側電気接点、3a、3bは補強板、4a、
4bはそれぞれ固定側電極棒、可動側電極棒で、これらを
もってそれぞれ固定側電極6a、可動側電極6bを構成す
る、可動側電極6bは、遮断時の金属蒸気等の飛散を防ぐ
可動側シールド8を介して可動側ホルダー12にろう付け
接合される。これらは、固定側端板9a、可動側端板9b、
及び絶縁筒13によって高真空にろう付け封止され、固定
側電極6a及び可動側ホルダー12のネジ部をもって外部導
体と接続される。絶縁筒13の内面には、遮断時の金属蒸
気等の飛散を防ぐシールド7が設けられ、また、可動側
端板9bと可動側ホルダー12の間には摺動部分を支えるた
めのガイド１1が設けられる。可動側シールド8と可動側
端板9bの間にはベローズ10が設けられ、真空バルブ内を
真空に保ったまま可動側ホルダー12を上下させ、固定側
電極6aと可動側電極6bを開閉させることが出来る。本実
施例では、固定側電極6a及び可動側電極6bに、実施例２
で作製した図１に示す構造の電極を用いて、図２に示す
真空バルブを作製した。FIG. 2 is a view showing the structure of the vacuum valve according to this embodiment. In FIG. 2, 1a and 1b are fixed side electric contacts, movable side electric contacts, 3a and 3b are reinforcing plates, 4a,
4b are fixed side electrode rods and movable side electrode rods, respectively, which constitute the fixed side electrode 6a and the movable side electrode 6b.The movable side electrode 6b is a movable side shield 8 which prevents scattering of metal vapor etc. at the time of interruption. It is brazed to the movable holder 12 via. These are the fixed side end plate 9a, the movable side end plate 9b,
And, it is brazed and sealed to a high vacuum by the insulating cylinder 13, and is connected to the external conductor by the fixed side electrode 6a and the screw part of the movable side holder 12. A shield 7 is provided on the inner surface of the insulating cylinder 13 to prevent scattering of metal vapor or the like when shutting off, and a guide 11 for supporting a sliding portion is provided between the movable side end plate 9b and the movable side holder 12. It is provided. A bellows 10 is provided between the movable side shield 8 and the movable side end plate 9b, and the movable side holder 12 is moved up and down while the vacuum valve is kept in vacuum to open and close the fixed side electrode 6a and the movable side electrode 6b. Can be done. In the present embodiment, the fixed side electrode 6a and the movable side electrode 6b are the same as those of the example 2
The vacuum valve shown in FIG. 2 was produced using the electrode having the structure shown in FIG.
【００３７】（実施例４）本実施例では、実施例３で作
製した真空バルブを真空遮断器に組み込んで、各種性能
試験を実施した結果、表２に示す結果を得た。なお、表
２におけるそれぞれの性能は、試料番号A1(組成:25Cr-7
5Cu、Cu粒径:80μm以下)の値を1として相対比較して表
した。高導電性金属粉末の粒径が80μm以上の場合、各
性能は粒径80μm以下の場合に比べて低くなる。これ
は、密度が低く、比抵抗が大きいためである。(Example 4) In this example, the vacuum valve manufactured in Example 3 was incorporated into a vacuum circuit breaker, and various performance tests were carried out. As a result, the results shown in Table 2 were obtained. In addition, each performance in Table 2 is sample No. A1 (composition: 25Cr-7
The values of 5Cu and Cu particle diameter: 80 μm or less) were set to 1 and expressed relative to each other. When the particle size of the highly conductive metal powder is 80 μm or more, each performance is lower than when the particle size is 80 μm or less. This is because the density is low and the specific resistance is high.
【００３８】[0038]
【表２】 [Table 2]
【００３９】高導電性金属粉末の粒径が80μm以下で、
第２成分が含まれる電気接点部材の場合には、第２成分
がガスを吸収してアークの消弧作用を高め、遮断性能が
向上するとともに、第２成分の化合物(特に酸化物)が微
細に分散することで耐電圧特性、耐溶着性能が向上す
る。The particle size of the highly conductive metal powder is 80 μm or less,
In the case of the electrical contact member containing the second component, the second component absorbs gas to enhance the arc extinguishing action and improves the breaking performance, and the compound of the second component (particularly oxide) is fine. The withstand voltage characteristic and the welding resistance performance are improved by the dispersion.
【００４０】以上、本実施例に係わる電気接点部材は、
遮断性能、耐電圧特性、耐溶着性を両立させるために有
益であることが実証された。As described above, the electrical contact member according to this embodiment is
It was proved to be useful for achieving both the breaking performance, the withstand voltage characteristics, and the welding resistance.
【００４１】[0041]
【発明の効果】本発明による電気接点部材は、高導電性
金属からなるマトリックスに第２成分が均一に固溶した
溶融合金を用いることにより、電流遮断時に溶融分解さ
れた第２成分元素が酸素等のガスを吸収し、アークの消
弧作用を高めることにより遮断性能を安定化させること
ができる。また、酸素等のガスを吸収した第２成分元素
は酸化物等の化合物を生成し、この化合物は比較的硬質
かつ高融点であり、この化合物が微細に電気接点表面に
分散することにより、耐電圧特性及び耐溶着性能を高め
ることができる。更に、本発明による製造法によれば、
上記の材料組成をもつ電気接点部材が効率よく大量生産
できるため、高い生産性が得られるものである。The electric contact member according to the present invention uses a molten alloy in which the second component is uniformly dissolved in a matrix made of a highly conductive metal, so that the second component element melted and decomposed when the current is cut off is oxygen. It is possible to stabilize the breaking performance by absorbing gas such as, and enhancing the arc extinguishing action. In addition, the second component element that has absorbed gas such as oxygen produces a compound such as an oxide, and this compound is relatively hard and has a high melting point. It is possible to improve voltage characteristics and anti-welding performance. Furthermore, according to the manufacturing method of the present invention,
Since the electrical contact member having the above material composition can be efficiently mass-produced, high productivity can be obtained.
【図１】 本発明に係わる電極の構造を示す上面図及び
断面図である。FIG. 1 is a top view and a sectional view showing a structure of an electrode according to the present invention.
【図２】 本発明に係わる真空バルブの構造を示す断面
図である。FIG. 2 is a sectional view showing a structure of a vacuum valve according to the present invention.
1…電気接点、1a…固定側電気接点、1b…可動側電気接
点、2…スパイラル溝、3、3a、3b…補強板、4…電極
棒、5…ろう材、6a…固定側電極、6b…可動側電極、7…
シールド、8…可動側シールド、9a…固定側端板、9b…
可動側端板、10…ベローズ、11…ガイド、12…可動側ホ
ルダー、13…絶縁筒。1 ... electric contact, 1a ... fixed side electric contact, 1b ... movable side electric contact, 2 ... spiral groove, 3,3a, 3b ... reinforcing plate, 4 ... electrode rod, 5 ... brazing material, 6a ... fixed side electrode, 6b … Movable electrode, 7…
Shield, 8 ... Movable side shield, 9a ... Fixed side end plate, 9b ...
Movable side end plate, 10 ... Bellows, 11 ... Guide, 12 ... Movable side holder, 13 ... Insulating cylinder.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｈ 11/04 Ｈ０１Ｈ 11/04 Ｄ 33/66 33/66 Ｂ (72)発明者 小林 将人 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所電機システム事業部内 (72)発明者 鈴木 安昭 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所電機システム事業部内 (72)発明者 馬場 昇 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 (72)発明者 佐藤 隆 茨城県日立市大みか町七丁目２番１号 株 式会社日立製作所電力・電機開発研究所内 (72)発明者 湖口 義雄 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所電機システム事業部内 Ｆターム(参考） 4K018 AA04 CA02 KA34 5G023 AA05 CA33 5G026 BA01 BA04 BB02 BB11 BC04 BC09 5G050 AA02 AA06 AA11 AA12 AA13 AA14 AA17 AA20 AA23 AA24 AA27 AA29 AA36 AA38 AA39 AA43 AA45 AA48 AA51 AA53 AA54 BA02 BA05 CA01 DA10 EA02 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) H01H 11/04 H01H 11/04 D 33/66 33/66 B (72) Inventor Masato Kobayashi Hitachi Ibaraki Prefecture 1-1-1 Kokubuncho, Ichi, Ltd. (72) Inventor, Electric Systems Division, Hitachi, Ltd. Yasuaki Suzuki 1-1-1, Kokubuncho, Hitachi, Ibaraki Prefecture (72) Inventor, Baba, Hitachi Systems Ltd. Noboru 1-1-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd., Hitachi Research Institute, Inc. (72) Inventor Takashi Sato 7-2-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. In-house (72) Inventor Yoshio Koguchi 1-1-1 Kokubun-cho, Hitachi-shi, Ibaraki F-term (inside the Electric Systems Division, Hitachi, Ltd.) 4K018 AA04 CA02 KA34 5G023 AA05 CA33 5G026 BA01 BA04 BB02 BB11 BC04 BC09 5G050 AA02 AA06 AA11 AA12 AA13 AA14 AA17 AA20 AA23 AA24 AA27 AA29 AA36 AA38 AA39 AA43 AA45 AA48 AA51 AA53 AA54 BA02 BA05 CA01 DA10 EA02
Claims (14)
合粉末によって焼結された焼結合金からなることを特徴
とする電気接点部材。1. An electrical contact member comprising a sintered alloy sintered with a mixed powder of a highly conductive alloy powder and a refractory metal powder.
火性金属粒子が分散した焼結合金からなり、前記高導電
性金属は溶融合金からなることを特徴とする電気接点部
材。2. An electrical contact member comprising a sintered alloy in which refractory metal particles are dispersed in a matrix made of a highly conductive metal, the highly conductive metal being a molten alloy.
火性金属粒子が分散した焼結合金からなり、前記耐火性
金属粉はCr、W、Mo、Ta、Nb、Be、Hf、Ir、Pt、Zr、T
i、Si、Rh及びRuの１種又は２種以上の混合物又はこれ
らの金属間化合物からなり、前記高導電性金属は主成分
がCuで、Mg、A1、Ti、Cr、Zr、Sn、Zn、Ni、Co、Fe、Mn
及びSiの１種又は２種以上を含む溶融合金からなること
を特徴とする電気接点部材。3. A sintered alloy in which refractory metal particles are dispersed in a matrix made of a highly conductive metal, and the refractory metal powder is Cr, W, Mo, Ta, Nb, Be, Hf, Ir, Pt. , Zr, T
i, Si, Rh and Ru, or a mixture of two or more thereof, or an intermetallic compound thereof, and the high conductivity metal is Cu as a main component, and Mg, A1, Ti, Cr, Zr, Sn, Zn , Ni, Co, Fe, Mn
And an electric contact member comprising a molten alloy containing one or more of Si.
火性金属の15〜40重量%と、前記高導電性金属の60〜85
重量%とを有することを特徴とする電気接点部材。4. The refractory metal according to claim 1, wherein the refractory metal is contained in an amount of 15 to 40% by weight, and the highly conductive metal is contained in an amount of 60 to 85% by weight.
An electric contact member comprising:
結合金の酸素量が2500ppm以下であることを特徴とする
電気接点部材。5. The electrical contact member according to claim 1, wherein the sintered alloy has an oxygen content of 2500 ppm or less.
結合金の比抵抗が5.5μΩ・cm以下であることを特徴と
する電気接点部材。6. The electrical contact member according to claim 1, wherein the specific resistance of the sintered alloy is 5.5 μΩ · cm or less.
１種又は２種以上の混合物の少なくとも一種と、高導電
性金属として主成分がCuで、Mg、A1、Cr、Sn、Zn及びNi
の１種又は２種以上を含む溶融合金との焼結合金からな
ることを特徴とする電気接点部材。7. A refractory metal containing at least one selected from the group consisting of Be, lr, Pt, Rh, and Ru, or a mixture of two or more thereof, and a high-conductivity metal containing Cu as a main component, and Mg, A1, Cr, and Sn. , Zn and Ni
1. An electrical contact member comprising a sintered alloy with a molten alloy containing one or more of the above.
f、Zr、Ti及びSi の１種又は２種以上の混合物の少なく
とも一種と、高導電性金属として主成分がCuで、Ti、Z
r、Co、Fe、Mn及びSiの１種又は２種以上を含む溶融合金
との焼結合金からなることを特徴とする電気接点部材。8. A refractory metal such as Cr, W, Mo, Ta, Nb or H.
At least one of f, Zr, Ti and Si, or a mixture of two or more thereof, and the main component of the highly conductive metal is Cu.
An electrical contact member comprising a sintered alloy of a molten alloy containing one or more of r, Co, Fe, Mn and Si.
合粉末を、加圧成形して成形体を作製し、該成形体を真
空中又は不活性雰囲気中において前記高導電性合金の融
点以下で焼結することを特徴とする電気接点部材の製造
法。9. A mixed powder of a high-conductivity alloy powder and a refractory metal powder is pressure-molded to prepare a molded body, and the molded body is subjected to vacuum molding or in an inert atmosphere. A method for producing an electric contact member, which comprises sintering at a melting point or lower.
n、Zn、Ni、Co、Fe、Mn及びSiの１種又は２種以上を含
む合金粉末からなる高導電性金属粉末と、Cr、W、Mo、T
a、Nb、Be、Hf、Ir、Pt、Zr、Ti、Si、Rh及びRuの１種
又は２種以上の混合物又はこれらの金属間化合物の少な
くとも一種からなる耐火性金属粉末との混合粉末を、加
圧成形して成形体を作製し、該成形体を真空中又は不活
性雰囲気中において前記高導電性金属粉末の融点以下で
焼結することを特徴とする電気接点部材の製造法。10. The main component is Cu, and Mg, A1, Ti, Cr, Zr, S
Highly conductive metal powder made of an alloy powder containing one or more of n, Zn, Ni, Co, Fe, Mn and Si, and Cr, W, Mo, T
a, Nb, Be, Hf, Ir, Pt, Zr, Ti, Si, Rh and Ru, or a mixed powder of refractory metal powder consisting of at least one of these intermetallic compounds. A method for producing an electric contact member, comprising: forming a molded body by pressure molding, and sintering the molded body in a vacuum or an inert atmosphere at a temperature not higher than the melting point of the highly conductive metal powder.
末を、120〜500MPaで加圧成形することを特徴とする電
気接点部材の製法。11. The method for manufacturing an electric contact member according to claim 9, wherein the mixed powder is pressure-molded at 120 to 500 MPa.
記高導電性金属粉末は、その粒径が80μm以下であるこ
とを特徴とする請求項1〜5に記載の電気接点部材の製
法。12. The method for manufacturing an electrical contact member according to claim 1, wherein the highly conductive metal powder has a particle size of 80 μm or less.
を備えた真空バルブにおいて、前記固定側電極及び可動
側電極は請求項１〜８のいずれかに記載の電気接点部材
又は請求項９〜１２のいずれかに記載の電気接点部材の
製造法によって製造された電気接点部材からなる真空バ
ルブ。13. A vacuum valve having a fixed-side electrode and a movable-side electrode in a vacuum container, wherein the fixed-side electrode and the movable-side electrode are the electrical contact member or the electric contact member according to any one of claims 1 to 8. A vacuum valve comprising an electric contact member manufactured by the method for manufacturing an electric contact member according to any one of 9 to 12.
を備えた真空バルブと、該真空バルブ内の前記固定側電
極と可動側電極との各々に前記真空バルブ外に接続され
た絶縁ロッドを介して前記可動側電極を駆動する開閉手
段とを備えた真空遮断器において、前記真空バルブは請
求項１３に記載の真空バルブからなることを特徴とする
真空遮断器。14. A vacuum valve having a fixed-side electrode and a movable-side electrode inside a vacuum container, and an insulating member connected to the outside of the vacuum valve for each of the fixed-side electrode and the movable-side electrode inside the vacuum valve. A vacuum circuit breaker comprising an opening / closing means for driving the movable electrode via a rod, wherein the vacuum valve comprises the vacuum valve according to claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001343067A JP2003147407A (en) | 2001-11-08 | 2001-11-08 | Electric contact, its manufacturing method, and vacuum valve and vacuum circuit breaker using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001343067A JP2003147407A (en) | 2001-11-08 | 2001-11-08 | Electric contact, its manufacturing method, and vacuum valve and vacuum circuit breaker using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003147407A true JP2003147407A (en) | 2003-05-21 |
Family
ID=19156820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001343067A Pending JP2003147407A (en) | 2001-11-08 | 2001-11-08 | Electric contact, its manufacturing method, and vacuum valve and vacuum circuit breaker using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003147407A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449663C (en) * | 2006-09-27 | 2009-01-07 | 上海应用技术学院 | Copper-based electric contact alloy contact forming and thermal treatment producing method |
| US7704449B2 (en) * | 2004-11-15 | 2010-04-27 | Hitachi, Ltd. | Electrode, electrical contact and method of manufacturing the same |
| EP2362400A2 (en) | 2010-02-17 | 2011-08-31 | Hitachi Ltd. | Electrical contact and switch device using same |
| CN103509964A (en) * | 2013-09-18 | 2014-01-15 | 温州银泰合金材料有限公司 | Rare earth alloy electrical contact terminal material and production method thereof |
| CN103752816A (en) * | 2013-12-28 | 2014-04-30 | 扬州立德粉末冶金股份有限公司 | Gasoline engine exhaust valve seat and preparing method thereof |
| CN104795264A (en) * | 2015-04-27 | 2015-07-22 | 山东泰开精密铸造有限公司 | Method for manufacturing arc-resistant copper-tungsten contacts for high-voltage switches |
| JP2017508072A (en) * | 2014-01-20 | 2017-03-23 | イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ | Vacuum circuit breaker with arc-resistant central shield |
| CN111218581A (en) * | 2020-02-24 | 2020-06-02 | 昆明贵金属研究所 | High-density high-strength silver-carbon composite electric contact material and preparation method thereof |
-
2001
- 2001-11-08 JP JP2001343067A patent/JP2003147407A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7704449B2 (en) * | 2004-11-15 | 2010-04-27 | Hitachi, Ltd. | Electrode, electrical contact and method of manufacturing the same |
| CN100449663C (en) * | 2006-09-27 | 2009-01-07 | 上海应用技术学院 | Copper-based electric contact alloy contact forming and thermal treatment producing method |
| EP2362400A2 (en) | 2010-02-17 | 2011-08-31 | Hitachi Ltd. | Electrical contact and switch device using same |
| CN103509964A (en) * | 2013-09-18 | 2014-01-15 | 温州银泰合金材料有限公司 | Rare earth alloy electrical contact terminal material and production method thereof |
| CN103509964B (en) * | 2013-09-18 | 2015-10-14 | 温州银泰合金材料有限公司 | Rare earth alloy electrical contact terminal and production method thereof |
| CN103752816A (en) * | 2013-12-28 | 2014-04-30 | 扬州立德粉末冶金股份有限公司 | Gasoline engine exhaust valve seat and preparing method thereof |
| JP2017508072A (en) * | 2014-01-20 | 2017-03-23 | イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ | Vacuum circuit breaker with arc-resistant central shield |
| JP7198571B2 (en) | 2014-01-20 | 2023-01-04 | イートン インテリジェント パワー リミテッド | Vacuum circuit breaker with arc-resistant central shield |
| CN104795264A (en) * | 2015-04-27 | 2015-07-22 | 山东泰开精密铸造有限公司 | Method for manufacturing arc-resistant copper-tungsten contacts for high-voltage switches |
| CN111218581A (en) * | 2020-02-24 | 2020-06-02 | 昆明贵金属研究所 | High-density high-strength silver-carbon composite electric contact material and preparation method thereof |
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