JP2692886B2 - Contact material for vacuum valve - Google Patents
Contact material for vacuum valveInfo
- Publication number
- JP2692886B2 JP2692886B2 JP63213631A JP21363188A JP2692886B2 JP 2692886 B2 JP2692886 B2 JP 2692886B2 JP 63213631 A JP63213631 A JP 63213631A JP 21363188 A JP21363188 A JP 21363188A JP 2692886 B2 JP2692886 B2 JP 2692886B2
- Authority
- JP
- Japan
- Prior art keywords
- contact material
- tungsten carbide
- vacuum valve
- less
- particle size
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/0203—Contacts characterised by the material thereof specially adapted for vacuum switches
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は、真空しゃ断器におけるサージ電圧を発生さ
せないために裁断電流特性が優れている接点材料に関す
る。Description: [Object of the Invention] (Industrial field of application) The present invention relates to a contact material having excellent cutting current characteristics because it does not generate a surge voltage in a vacuum circuit breaker.
（従来の技術と発明が解決しようとする課題） 真空しゃ断器においては、サージ電圧を発生させない
ために、裁断電流を小さくする必要がある。(Problems to be Solved by Conventional Techniques and Inventions) In a vacuum circuit breaker, it is necessary to reduce the cutting current in order to prevent generation of surge voltage.
従来、低サージ用接点材料としては、銀、コバルト及
び炭化タングステンからなるものが基本材料として知ら
れている。そして炭化タングステンの平均粒径は通常１
μｍ以上のものであった。Conventionally, as a contact material for low surge, one made of silver, cobalt and tungsten carbide is known as a basic material. And the average particle size of tungsten carbide is usually 1
It was more than μm.
真空接点については、さらに裁断電流特性をできるだ
け最大値、平均値ともに下げたいという要望が強い。For vacuum contacts, there is a strong demand to further reduce the cutting current characteristics in both maximum and average values.
［発明の構成］ （課題を解決するための手段と作用） 本発明者は、炭化タングステン粒子の粒径を一定以下
の微細なものを選択することにより裁断電流を大巾に下
げることができた。[Structure of the Invention] (Means and Actions for Solving the Problem) The inventor of the present invention was able to greatly reduce the cutting current by selecting a fine tungsten carbide particle having a particle diameter of a certain value or less. .
即ち、本発明は、銅と銀の共晶、コバルト及び炭化タ
ングステンからなる真空バルブ用接点材料において、炭
化タングステン粒子が粒径0.8μｍ以下のものが80％以
上であり、１μｍ以上のものが10％以下であることを特
徴とする。That is, in the present invention, 80% or more of the tungsten carbide particles have a particle size of 0.8 μm or less and 10% or more of the tungsten carbide particles have a particle size of 0.8 μm or less in a contact material for a vacuum valve, which is composed of a eutectic of copper and silver, cobalt and tungsten carbide. % Or less.
本発明の接点材料は、銀と銅の含有率が25〜65重量％
であり、銀と銅の総計量に占める銀の比率が40〜90重量
％である銅と銀の共晶からなる高導電性材料；コバルト
が0.1〜1.0重量％からなる補助材料及び炭化タングステ
ンが35〜75重量％からなる耐弧材料で構成される。The contact material of the present invention has a silver and copper content of 25 to 65% by weight.
And a highly conductive material composed of a eutectic of copper and silver in which the ratio of silver to the total amount of silver and copper is 40 to 90% by weight; an auxiliary material containing 0.1 to 1.0% by weight of cobalt and tungsten carbide. Composed of 35-75 wt% arc resistant material.
炭化タングステン粒子は小さいほど裁断値は小さくな
るが、経済的には作りやすさと効果の相関であり、効果
的な粒度分布を選択することが重要である。本発明の炭
化タングステンは粒径0.8μｍ以下のものが80％以上で
あり、１μｍ以上のものが10％以下であることを要す
る。The smaller the tungsten carbide particles, the smaller the cutting value, but economically, there is a correlation between the ease of making and the effect, and it is important to select an effective particle size distribution. It is necessary that the tungsten carbide of the present invention has a grain size of 0.8 μm or less in 80% or more and a grain size of 1 μm or more in 10% or less.
以下に本発明の実施例を示す。 Hereinafter, examples of the present invention will be described.
実施例１〜４ WC粉末とCo粉末にAgとCuの粉末の所定量の半量を添加
混合して原料粉末を得た。この原料粉末を１〜7t/cm2の
圧力で成形し、成形体を非酸化性雰囲気中、1200℃で１
時間燒結して圧粉燒結体を得た。この燒結体に残量のAg
とCuを水素雰囲気中、1100〜1200℃で１時間含浸させて
接点材料を得、これより接点を製造した。使用したWC粉
末の粒度分布により実施例１〜４及び比較例１〜４で得
られた接点材料の組成は第１表のとおりである。Examples 1 to 4 WC powder and Co powder were added and mixed with a predetermined amount of half amount of Ag and Cu powder to obtain raw material powder. This raw material powder is compacted at a pressure of 1 to 7 t / cm 2 , and the compact is molded at 1200 ° C in a non-oxidizing atmosphere at 1 ° C.
Sintered for a period of time to obtain a sintered powder compact. The remaining Ag in this sintered body
And Cu were impregnated in a hydrogen atmosphere at 1100 to 1200 ° C. for 1 hour to obtain a contact material, from which a contact was manufactured. Table 1 shows the compositions of the contact materials obtained in Examples 1 to 4 and Comparative Examples 1 to 4 depending on the particle size distribution of the WC powder used.
上記実施例により製造した接点について、裁断電流特
性を試験した結果は第２表のとおりである。 Table 2 shows the results of testing the cutting current characteristics of the contacts manufactured according to the above examples.
なお、裁断電流の測定法は次のようにして行った。 The cutting current was measured as follows.
直径10mm、厚さ4mmで、一方は平面、他方は200mmRの
球面を有する一対の供試接点に、400℃のベーキング、
放電エージングを行った後、これらに直列に挿入した同
軸形シャントの電圧降下をシンクロスコープで観測し
た。接点には、L.C回路を経て44Aの交流を与え、接触圧
力10kgでの300回の開閉における裁断電流値を、実施例
４に示した接点材料の平均値を1.0とした比較値で示し
た。なお、数値は接点数３ケの平均値である。Baking at 400 ℃ on a pair of test contacts with a diameter of 10mm and a thickness of 4mm, one of which is flat and the other of which has a spherical surface of 200mmR,
After performing discharge aging, the voltage drop of the coaxial shunt inserted in series was observed with a synchroscope. An alternating current of 44 A was applied to the contact through an LC circuit, and the cutting current value at 300 times of opening and closing at a contact pressure of 10 kg was shown as a comparison value with the average value of the contact material shown in Example 4 being 1.0. The numerical value is an average value of three contact points.
［発明の効果］ 本発明の接点材料における耐弧材料である炭化タング
ステン粒子を、粒径0.8μｍ以下のものが80％以上であ
り、１μｍ以上のものが10％以下とすることにより、第
２表から明らかなように、裁断電流値を大巾に低下させ
ることができる。 [Advantages of the Invention] The tungsten carbide particles, which are the arc-resistant material in the contact material of the present invention, have a particle size of 0.8 μm or less of 80% or more, and a particle size of 1 μm or more of 10% or less. As is clear from the table, the cutting current value can be greatly reduced.
Claims (1)
テンからなる真空バルブ用接点材料において、炭化タン
グステン粒子が、粒径0.8μｍ以下のものが80％以上で
あり、１μｍ以上のものが10％以下であることを特徴と
する真空バルブ用接点材料。1. A vacuum valve contact material comprising a eutectic of copper and silver, cobalt and tungsten carbide, wherein the tungsten carbide particles having a particle size of 0.8 μm or less account for 80% or more, and those having a particle size of 1 μm or more for 10%. % Or less, a contact material for a vacuum valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63213631A JP2692886B2 (en) | 1988-08-30 | 1988-08-30 | Contact material for vacuum valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63213631A JP2692886B2 (en) | 1988-08-30 | 1988-08-30 | Contact material for vacuum valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0265021A JPH0265021A (en) | 1990-03-05 |
| JP2692886B2 true JP2692886B2 (en) | 1997-12-17 |
Family
ID=16642354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63213631A Expired - Lifetime JP2692886B2 (en) | 1988-08-30 | 1988-08-30 | Contact material for vacuum valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2692886B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3598195B2 (en) * | 1997-03-07 | 2004-12-08 | 芝府エンジニアリング株式会社 | Contact material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6277439A (en) * | 1985-09-30 | 1987-04-09 | Toshiba Corp | Contact point material for vacuum valve |
-
1988
- 1988-08-30 JP JP63213631A patent/JP2692886B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0265021A (en) | 1990-03-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070905 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080905 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |