JPH0261768B2 - - Google Patents
Info
- Publication number
- JPH0261768B2 JPH0261768B2 JP18628983A JP18628983A JPH0261768B2 JP H0261768 B2 JPH0261768 B2 JP H0261768B2 JP 18628983 A JP18628983 A JP 18628983A JP 18628983 A JP18628983 A JP 18628983A JP H0261768 B2 JPH0261768 B2 JP H0261768B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- resistance
- weight
- cdo
- sno
- 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
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- 229910006404 SnO 2 Inorganic materials 0.000 claims description 20
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 19
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims 1
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims 1
- 238000003466 welding Methods 0.000 description 21
- 238000005299 abrasion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052797 bismuth Inorganic materials 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Inorganic materials [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Contacts (AREA)
Description
本発明は組み合わせ電気接点の改良に関する。
近時、電気、電子技術の発展に伴い各種電気、
電子機器が小型化され、それに応じてスイツチ、
リレー等も小型化されている。
然し乍らスイツチ、リレー等が小型化されると
沿面距離や絶縁距離がとりにくくなる。つまり絶
縁抵抗や耐電圧の劣化を招くという問題が生じ
る。又電気接点の接触力、開離力が小さくなつて
溶着が起き易くなるという問題や接触抵抗、温度
上昇が高くなるという問題が起きる。なお温度上
昇については接触抵抗と比例の関係にある。この
ため耐消耗性に優れた材料を使用し絶縁抵抗、耐
電圧劣化を防ぎ又接触抵抗、温度上昇が低く安定
かつ耐溶着性に優れた組み合わせ電気接点が要望
され種々の組み合わせ電気接点の開発がなされて
いるが今だ満足すべきものがない。
従来、組み合わせ電気接点にはAg中に金属酸
化物を分散したAg−酸化物より成る接点が用い
られその中でもAg−SnO2−Bi2O3やAg−SnO2−
Bi2O3−NiOより成る接点同志を対向させた組み
合わせ電気接点はAg−CdOやAg−CdO−NiOよ
り成る接点同志を対向させた組み合わせ電気接点
に比しSnO2が熱的安定なため耐溶着性、耐消耗
性に優れているが逆に接触抵抗が不安定かつ温度
上昇が高くなる。又Ag−CdO又はAg−CdO−
NiOより成る接点同志を対向させた組み合わせ電
気接点は低接触力でも接触抵抗が低く安定し、温
度上昇も低いがAg−SnO2−Bi2O3、Ag−SnO2−
Bi2O3−NiOより成る接点同志に比し耐溶着性、
耐消耗性に劣るものである。
このように従来の組み合わせ電気接点は相対向
する固定接点と可動接点に同じ電気接点材料を用
いていたので耐溶着性、耐消耗性は良いが接触抵
抗の安定性が悪くかつ温度上昇が高かつたり、又
逆に接触抵抗は低く安定し、温度上昇も低いが耐
溶着性、耐消耗性が悪いとの問題があつた。そこ
で本発明者は、小型化されたリレー、スイツチ等
に於いても耐消耗性、接触抵抗の安定性が良く、
耐溶着性に優れた組み合わせ電気接点を開発すべ
く鋭意攻究の結果、相対向する固定接点と可動接
点に異なる接点材料を用いることにより耐溶着
性、耐消耗性及び接触抵抗の安定性が向上し見い
出した。
本発明はこの点に着目してなされたものであ
り、耐溶着性、耐消耗性及び接触抵抗の安定性を
確実に向上させることのできる組み合わせ電気接
点としてAg−SnO2−Bi2O3系の接点とAg−CdO
系の接点とを相対向させて成る組み合わせ電気接
点を提供せんとするものである。
本発明による組み合わせ電気接点は、相対向す
る接点にSn4〜8.5重量％、Bi0.5〜3.5重量％を含
むAg−SnO2−Bi2O3系の接点とCd10〜20重量％
を含むAg−CdO系の接点を用いたことを特徴と
するものである。
本発明の組み合わせ電気接点に於いて上記の如
く相対向する接点の材料を限定した理由は、Ag
−SnO2−Bi2O3系の優れた耐溶着性、耐消耗性を
生かし、またAg−CdO系の接触抵抗の安定性、
低い温度上昇を生かし、これらの相乗効果により
従来の同じ材料の接点を相対向させた組み合わせ
電気接点に於ける劣悪な耐溶着性、或いは耐消耗
性、接触抵抗の安定性の悪さを解消する為であ
る。またAg−SnO2−Bi2O3系のSnの含有量を４
〜8.5重量％と限定した理由は、４重量％未満で
は耐溶着性が不充分であり、8.5重量％を超える
と耐溶着性には問題がないが、接点開閉時SnO2
の凝集がひどくなり接触抵抗が極度に高くなるか
らである。Biの含有量を0.5〜3.5重量％と限定し
た理由は、0.5重量％未満では耐溶着性が不充分
であり、3.5重量％を超えると耐消耗性が劣化す
るからである。また上記成分範囲内であれば、
Ag−SnO2−Bi2O3に更にNi0.1〜0.5重量％の酸
化物を添加しても特性は阻害されないものであ
る。
Ag−CdO系のCdの含有量を10〜20重量％と限
定した理由は、10重量％未満では耐溶着性が不充
分であり、20重量％を超えると耐溶着性は問題な
いが消耗量が多くなつて、寿命が短かくなるから
である。また上記成分範囲内であれば、Ag−
CdOに更にNi0.1〜0.5重量％の酸化物を添加して
も特性は阻害されないものである。
尚、本発明の組み合わせ電気接点における接点
の材料として使用するAg−SnO2−Bi2O3、Ag−
SnO2−Bi2O3−NiO、Ag−CdO、Ag−CdO−
NiOは、Ag中にSnO2、Bi2O3、NiO、CdOが細
かく分散してさえいれば、内部酸化法、粉末冶金
法、内部酸化法と粉末冶金法の併用等のいずれの
方法によつて作られたものでも良いものである。
次に本発明による組み合わせ電気接点の効果を
明瞭ならしめる為にその具体的な実施例と従来例
について説明する。
実施例 １
Cd11重量％を含むAg−CdOより成る5φmmの固
定接点と、Snを７重量％、Biを３重量％を含む
Ag−SnO2−Bi2O3より成る4φmmの可動接点とを
相対向させて組み合わせ電気接点を構成した。
実施例 ２
Cd13重量％を含むAg−CdOより成る5φmmの固
定接点とSn8重量％、Biを２重量％、Niを0.3重
量％を含むAg−SnO2−Bi2O3−NiOより成る4φ
mmの可動接点とを相対向させて組み合わせ電気接
点を構成した。
実施例 ３
Cd17重量％、Niを0.4重量％含むAg−Cd−
NiOより成る5φmmの固定接点とSn5重量％、Biを
0.8重量％、Niを0.3重量％を含むAg−SnO2−
Bi2O3−NiOより成る4φmmの可動接点とを相対向
させて組み合わせ電気接点を構成した。
従来例 １
Cd11重量％を含むAg−CdOより成る5φmmの固
定接点と4φmm可動接点とを相対向させて組み合
わせ電気接点を構成した。
従来例 ２
Sn7重量％、Biを３重量％含むAg−SnO2−
Bi2O3より成る5φmmの固定接点と4φmmの可動接点
とを相対向させて組み合わせ電気接点を構成し
た。
然してこれら各組み合わせ電気接点を下記の試
験条件にて溶着、消耗及び接触抵抗を測定したと
ころ下表の右欄に示すような結果を得た。
試験条件
AC 200V 50Hz
投入電流 40A
定常電流 12A
開閉頻度 25回／分
開閉回数 20万回
The present invention relates to improvements in combination electrical contacts. Recently, with the development of electrical and electronic technology, various electrical
As electronic devices become smaller, switches and
Relays and the like are also becoming smaller. However, as switches, relays, etc. become smaller, creepage distances and insulation distances become difficult to maintain. In other words, a problem arises in that insulation resistance and withstand voltage deteriorate. Further, the contact force and separation force of the electrical contacts are reduced, causing problems such as welding becoming more likely to occur, and problems such as contact resistance and temperature rise increasing. Note that the temperature rise is proportional to the contact resistance. For this reason, there is a demand for combination electrical contacts that use materials with excellent wear resistance to prevent deterioration of insulation resistance and withstand voltage, and that are stable and have excellent welding resistance with low contact resistance and temperature rise, and the development of various combination electrical contacts is required. Things have been done, but there is still nothing to be satisfied with. Conventionally, contacts made of Ag-oxide, in which metal oxide is dispersed in Ag, have been used for combination electrical contacts, and among these, Ag-SnO 2 -Bi 2 O 3 and Ag-SnO 2 -
A combination electrical contact made of Bi 2 O 3 -NiO with contacts facing each other has better durability than a combination of electrical contacts made of Ag-CdO or Ag-CdO-NiO, because SnO 2 is thermally stable. It has excellent weldability and wear resistance, but has unstable contact resistance and high temperature rise. Also Ag−CdO or Ag−CdO−
A combination electrical contact made of NiO contacts facing each other has low contact resistance and stability even with low contact force, and has a low temperature rise .
Welding resistance compared to contacts made of Bi 2 O 3 −NiO,
It has poor wear resistance. In this way, conventional combination electrical contacts use the same electrical contact material for the opposing fixed and movable contacts, which has good welding and abrasion resistance, but has poor contact resistance stability, high temperature rise, and On the other hand, the contact resistance is low and stable, and the temperature rise is low, but there are problems in that the welding resistance and abrasion resistance are poor. Therefore, the inventor of the present invention has realized that even in miniaturized relays, switches, etc., they have good wear resistance and stable contact resistance.
As a result of intensive research to develop a combination electrical contact with excellent welding resistance, welding resistance, wear resistance, and stability of contact resistance were improved by using different contact materials for the opposing fixed and movable contacts. I found out. The present invention has been made with attention to this point, and uses Ag-SnO 2 -Bi 2 O 3 system as a combination electrical contact that can reliably improve welding resistance, wear resistance, and stability of contact resistance. contact and Ag−CdO
It is an object of the present invention to provide a combination electrical contact formed by opposing the contacts of the system. The combined electrical contact according to the present invention has an Ag-SnO 2 -Bi 2 O 3 type contact containing 4 to 8.5 weight % Sn and 0.5 to 3.5 weight % Bi and 10 to 20 weight % Cd in opposing contacts.
This is characterized by the use of Ag-CdO-based contacts containing . The reason for limiting the materials of the opposing contacts as described above in the combined electrical contact of the present invention is that Ag
- Taking advantage of the excellent welding resistance and abrasion resistance of the -SnO 2 -Bi 2 O 3 system, and the stability of contact resistance of the Ag-CdO system,
Taking advantage of the low temperature rise, this synergistic effect eliminates the poor welding resistance, wear resistance, and poor contact resistance stability of conventional electrical contacts made of the same material and facing each other. It is. In addition, the content of Sn in the Ag−SnO 2 −Bi 2 O 3 system was increased to 4
The reason why it is limited to ~8.5% by weight is that if it is less than 4% by weight, the welding resistance is insufficient, and if it exceeds 8.5% by weight, there is no problem with the welding resistance, but SnO 2
This is because the agglomeration becomes severe and the contact resistance becomes extremely high. The reason why the Bi content is limited to 0.5 to 3.5% by weight is that if it is less than 0.5% by weight, the welding resistance will be insufficient, and if it exceeds 3.5% by weight, the abrasion resistance will deteriorate. Also, if the ingredients are within the above range,
Even if 0.1 to 0.5% by weight of Ni oxide is further added to Ag-SnO 2 -Bi 2 O 3 , the properties are not impaired. The reason for limiting the Cd content of the Ag-CdO system to 10 to 20% by weight is that if it is less than 10% by weight, the welding resistance is insufficient, and if it exceeds 20% by weight, there is no problem in the welding resistance, but the amount of wear is This is because as the number increases, the lifespan becomes shorter. Also, if it is within the above component range, Ag-
Even if 0.1 to 0.5% by weight of Ni oxide is further added to CdO, the properties are not impaired. Note that Ag-SnO 2 -Bi 2 O 3 and Ag-
SnO 2 −Bi 2 O 3 −NiO, Ag−CdO, Ag−CdO−
NiO can be produced by any method such as internal oxidation, powder metallurgy, or a combination of internal oxidation and powder metallurgy, as long as SnO 2 , Bi 2 O 3 , NiO, and CdO are finely dispersed in Ag. It is good even if it is made by hand. Next, in order to clarify the effects of the combined electrical contact according to the present invention, specific examples and conventional examples thereof will be described. Example 1 A 5φmm fixed contact made of Ag-CdO containing 11% by weight of Cd, 7% by weight of Sn, and 3% by weight of Bi.
A 4φmm movable contact made of Ag-SnO 2 -Bi 2 O 3 was placed facing each other to form an electric contact. Example 2 A 5φmm fixed contact made of Ag-CdO containing 13% by weight of Cd and a 4φ made of Ag-SnO 2 -Bi 2 O 3 -NiO containing 8% by weight of Sn, 2% by weight of Bi, and 0.3% by weight of Ni.
A movable contact of mm was made to face each other to form an electric contact. Example 3 Ag-Cd- containing 17% by weight of Cd and 0.4% by weight of Ni
5φmm fixed contact made of NiO, Sn5wt%, Bi
Ag−SnO 2 − containing 0.8 wt% and 0.3 wt% Ni
An electric contact was constructed by combining a 4φmm movable contact made of Bi 2 O 3 −NiO and facing each other. Conventional Example 1 An electric contact was constructed by combining a 5φmm fixed contact made of Ag-CdO containing 11% by weight of Cd and a 4φmm movable contact facing each other. Conventional example 2 Ag-SnO 2 − containing 7% Sn and 3% Bi by weight
An electric contact was constructed by combining a 5φmm fixed contact made of Bi 2 O 3 and a 4φmm movable contact facing each other. When the welding, wear and contact resistance of each of these combinations of electrical contacts were measured under the following test conditions, the results shown in the right column of the table below were obtained. Test conditions AC 200V 50Hz Closing current 40A Steady current 12A Opening/closing frequency 25 times/min Number of openings/closing 200,000 times
【表】
上記表で明らかなようにAg−SnO2−Bi2O3系
の接点とAg−CdO系の接点を相対向させた本発
明の組み合わせ電気接点は、格別に耐溶着性が良
いと言われている従来のAg−SnO2−Bi2O3の接
点同志を相対向させて組み合わせ電気接点よりも
接触抵抗が低く、更に同等の優れた耐溶着性、耐
消耗性を有し、また接触抵抗の安定性が良いと言
われている従来のAg−CdOの接点同志を相対向
させた組み合わせ電気接点よりも耐溶着性に優
れ、更に同等の接触抵抗の安定性に優れている。
以上詳記した通り本発明の組み合わせ電気接点
は、耐溶着性、耐消耗性及び接触抵抗の安定性共
に優れているので、小型化されたリレー、スイツ
チ等に使用した際、消耗が小さく、溶着の発生を
抑えることが出来接触抵抗を低く安定することが
できる等の効果がある。[Table] As is clear from the table above, the combined electrical contact of the present invention, in which the Ag-SnO 2 -Bi 2 O 3 type contact and the Ag-CdO type contact are placed opposite each other, has exceptionally good welding resistance. It has a lower contact resistance than the conventional electrical contacts made by arranging the contacts of Ag-SnO 2 -Bi 2 O 3 to face each other, and also has the same excellent welding resistance and wear resistance. It has better welding resistance than conventional electrical contacts made of a combination of Ag-CdO contacts facing each other, which is said to have good contact resistance stability, and also has an equivalent contact resistance stability. As detailed above, the combined electrical contact of the present invention has excellent welding resistance, abrasion resistance, and contact resistance stability, so when used in miniaturized relays, switches, etc., there is little wear and tear and no welding. This has the effect of suppressing the occurrence of contact resistance and keeping contact resistance low and stable.
Claims (1)
−SnO2−Bi2O3系接点とCd10〜20重量％含むAg
−CdO系の接点を相対向させてなる組み合わせ接
点。 ２ 前記Ag−SnO2−Bi2O3系接点、Ag−CdO系
接点の少なくとも一種が、Ni0.1〜0.5重量％含む
Ag−SnO2−Bi2O3−NiO接点、Ag−CdO−NiO
接点であることを特徴とする特許請求の範囲第１
項記載の組み合わせ電気接点。[Claims] 1. Ag containing 4 to 8.5% by weight of Sn and 0.5 to 3.5% by weight of Bi
−SnO 2 −Bi 2 O 3 type contacts and Ag containing 10 to 20% by weight of Cd
-A combination contact made of CdO-based contacts facing each other. 2 At least one of the Ag- SnO2 - Bi2O3 - based contact and Ag-CdO-based contact contains 0.1 to 0.5% by weight of Ni.
Ag−SnO 2 −Bi 2 O 3 −NiO contact, Ag−CdO−NiO
Claim 1 characterized in that it is a contact point.
Combination electrical contacts as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18628983A JPS6079618A (en) | 1983-10-05 | 1983-10-05 | Combination electric contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18628983A JPS6079618A (en) | 1983-10-05 | 1983-10-05 | Combination electric contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6079618A JPS6079618A (en) | 1985-05-07 |
| JPH0261768B2 true JPH0261768B2 (en) | 1990-12-21 |
Family
ID=16185701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18628983A Granted JPS6079618A (en) | 1983-10-05 | 1983-10-05 | Combination electric contact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6079618A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10230455A (en) * | 1997-02-17 | 1998-09-02 | Nec Corp | Polishing device |
-
1983
- 1983-10-05 JP JP18628983A patent/JPS6079618A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6079618A (en) | 1985-05-07 |
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