【発明の詳細な説明】[Detailed description of the invention]
本発明は、封入型リレー，スイツチ，マイクロ
スイツチ等の電気接点に用いる材料に関する。
従来、封入型リレー，スイツチ，マイクロスイ
ツチ等の電気接点材料としては、耐溶着性，耐消
耗性に優れた銀−酸化カドミウムが使用されてき
たが、何分にも材料が高価である為、低廉な銅−
酸化カドミウムの使用が考えられていた。
然し、銅−酸化カドミウムは耐溶着性について
は銀−酸化カドミウムに比べ著しく劣つている。
これは接触時のアークによつて接点面が著しく荒
れるためである。
この為、高価な銀−酸化カドミウムより成る封
入用電気接点材料と同等に耐溶着性に優れた低廉
な封入用電気接点材料の開発が要望されている。
本発明はかかる要望を満たすべく試験研究の結
果、満足できる封入用電気接点材料を見い出した
ものである。
本発明の封入用電気接点材料は、酸化インジウ
ム0.5〜25W／Ｏと、残部銅より成るものである。
本発明の封入用電気接点材料に於いて主成分を
銅とした理由は、低廉にして銀と同様に電気伝導
度が高いからである。銅に対して酸化インジウム
0.5〜25W／Ｏ添加した理由は、耐溶着性を銀−
酸化カドミウムと同等ならしめる為で、0.5W／
Ｏ未満ではその効果が無く、25W／Ｏを超えると
接触抵抗が大きく且つ不安定となるからである。
以下本発明の封入用電気接点材料の効果を明瞭
ならしめる為に、その具体的な実施例の封入用電
気接点材料と従来例の封入用電気接点材料により
作つた封入用電気接点の耐溶着性について述べ
る。
実施例 １
粉末冶金法で作つた直径2.5mmのCu−
In2O310.2W／Ｏ線を、ヘツダーにて頭部４mmφ
×１mmｔのリベツト接点となした。
実施例 ２
粉末冶金法で作つた直径４mmのCu−
In2O318.1W／Ｏ線を、施盤加工にて頭部４mmφ
×１mmｔのリベツト接点となした。
従来例 １
粉末冶金法で作つた直径４mmのCu−
CdO12W／Ｏ線を、施盤加工にて頭部４mmφ×１
mmｔのリベツト線点となした。
従来例 ２
内部酸化法で作つた直径2.5mmのAg−
CdO12W／Ｏ線を、ヘツダーにて頭部４mmφ×１
mmｔのリベツト接点となした。
然してこれら実施例１，２及び従来例１，２の
リベツト接点をヒンジ型リレーにかしめて試験用
リレーを組立て、これを夫々真空又は不活性ガス
（N2，Ar，N2−H2数％，Ar−H2，He，N2−O2
数％，Ar−O2，CO2，N2−CO2，Ar−CO2，
CO2−O2）充填容器，本例ではArガス充填容器
中に封入して下記の試験条件にて開閉試験を行な
い、封入型電気接点の溶着回数を測定した処、下
記の表に示すような結果を得た。
試験条件
負 荷 抵抗２段切換
電 圧 100V
周波数 50Hz
電 流 投入電流40A
定常電流10A
開閉頻度 20回／分
通電時間 0.62秒
休止時間 2.35秒
接触力 20ｇ
開離力 40ｇ
開閉回数 ５万回
The present invention relates to materials used for electrical contacts such as encapsulated relays, switches, microswitches, etc. Conventionally, silver-cadmium oxide, which has excellent welding resistance and abrasion resistance, has been used as an electrical contact material for encapsulated relays, switches, microswitches, etc. However, the material is expensive, so Cheap copper
The use of cadmium oxide was considered. However, copper-cadmium oxide is significantly inferior to silver-cadmium oxide in terms of adhesion resistance.
This is because the contact surface becomes extremely rough due to arcing during contact. For this reason, there is a demand for the development of an inexpensive electrical contact material for encapsulation that is as excellent in welding resistance as the expensive electrical contact material for encapsulation made of silver-cadmium oxide. In order to meet such demands, the present invention has been made as a result of testing and research and has resulted in the discovery of a satisfactory electrical contact material for encapsulation. The electrical contact material for encapsulation of the present invention consists of indium oxide 0.5 to 25 W/O and the balance copper. The reason why copper is used as the main component in the electrical contact material for encapsulation of the present invention is that it is inexpensive and has high electrical conductivity like silver. Indium oxide against copper
The reason for adding 0.5 to 25 W/O is to improve the welding resistance of silver.
This is to make it equivalent to cadmium oxide, 0.5W/
This is because if it is less than 0, there is no effect, and if it exceeds 25 W/O, the contact resistance becomes large and unstable. In order to clarify the effects of the electrical contact material for encapsulation of the present invention, the welding resistance of electrical contacts for encapsulation made from the electrical contact material for encapsulation of specific examples and the electrical contact material for encapsulation of the conventional example will be described below. Let's talk about. Example 1 Cu-2.5mm diameter made by powder metallurgy
In 2 O 3 10.2W/O wire, head 4mmφ at header
×1mmt rivet contact. Example 2 Cu with a diameter of 4 mm made by powder metallurgy
In 2 O 3 18.1W/O wire, head 4mmφ by lathe processing
×1mmt rivet contact. Conventional example 1 4 mm diameter Cu made by powder metallurgy
CdO12W/O wire, head 4mmφ x 1 by lathe machining
mmt rivet line point. Conventional example 2 Ag-2.5mm diameter made by internal oxidation method
CdO12W/O wire with header 4mmφ×1
mmt rivet contact. However, test relays were assembled by caulking the rivet contacts of Examples 1 and 2 and Conventional Examples 1 and 2 into hinge-type relays, and these were respectively heated in vacuum or inert gas (N 2 , Ar, N 2 -H 2 several percent). , Ar−H 2 , He, N 2 −O 2
Several %, Ar−O 2 , CO 2 , N 2 −CO 2 , Ar−CO 2 ,
CO 2 −O 2 ) filled container, in this example, an Ar gas filled container, and an opening/closing test was conducted under the following test conditions, and the number of welding times of the sealed electrical contact was measured, as shown in the table below. I got good results. Test conditions Load 2-step resistance switching Voltage 100V Frequency 50Hz Current Closing current 40A Steady current 10A Opening/closing frequency 20 times/minute Energizing time 0.62 seconds Rest time 2.35 seconds Contact force 20g Breaking force 40g Number of opening/closing 50,000 times
【表】
上記の表で明らかなように実施例１，２のリレ
ーに於ける電気接点は、従来例１のリレーに於け
る電気接点よりも溶着回数は一段と少ない。また
従来例２のリレーに於ける高価な電気接点と同等
に溶着回数が少なく、耐溶着性に優れていること
が判る。
以上詳記した通り本発明の封入用電気接点材料
は、貴金属を全く使用しない安価な材料であつ
て、しかも銀−酸化カドミウムより成る高価な封
入用電気接点材料と同等の優れた耐溶着性を有す
るので、これにとつて代わることのできる画期的
な封入用電気接点材料と言える。[Table] As is clear from the table above, the electrical contacts in the relays of Examples 1 and 2 are welded a much smaller number of times than the electrical contacts in the relay of Conventional Example 1. Furthermore, it can be seen that the number of times of welding is as small as that of the expensive electrical contacts in the relay of Conventional Example 2, and the welding resistance is excellent. As detailed above, the encapsulating electrical contact material of the present invention is an inexpensive material that does not use any precious metals, and has excellent welding resistance equivalent to the expensive encapsulating electrical contact material made of silver-cadmium oxide. Therefore, it can be said to be an innovative encapsulating electrical contact material that can replace this.