KR20160040585A - Electric contact point and contact element - Google Patents

Abstract

[PROBLEMS] In the prior art, in order to prevent peeling-off, an arc generated when a contact is opened and closed is guided by an arc horn or the like to prevent the contact and the support material from consuming, or the convex portion of the support material Thereby making it difficult for the contact to be melted. However, such a method can not be said to be capable of employing such a method in a case where the space of the small room can be sufficiently secured or only when the size of the support material can be sufficiently secured and the apparatus is downsized . [MEANS FOR SOLVING THE PROBLEMS] The present invention relates to a method for manufacturing a semiconductor device, in which a copper or copper alloy having excellent conductivity, thermal conductivity, and mechanical strength is adhered as a functional layer on the surface of a pure silver layer on the back surface of a contact, The functional layer is provided with a function of shortening the chattering duration or a function of preventing the peeling and the like by maintaining the bonding strength with the support material, thereby reducing the consumption amount of the electrical contact and improving the wear resistance Electrical contacts, and contacts.

Description

[0001] ELECTRIC CONTACT POINT AND CONTACT ELEMENT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical contact and a contact which can be used in a contact point control device such as a breaker or a magnet switch.

In order to realize long service life of a switching device such as a magnet switch, it is the fastest way to improve the wear resistance of the electrical contact material itself and make it longevity, and various researches on improvement of the wear resistance of the electrical contact material itself Development is underway.

Particularly, in the case where the frequency of opening and closing is high, such as a magnet switch or a relay, and the service life is desperately required due to the use conditions, a method of joining the electrical contact material and the supporting member of the contactor, It has been known that it has a great influence on the lifetime of the material itself.

In recent years, however, in the opening / closing apparatuses such as magnet switches and relays, the size of the apparatus has progressed, and the shape of the electrical contact itself tends to be designed to be small in order to reduce the amount of precious metal used for cost reduction. Rather, the use situation of the electrical contact material is severer, and the situation of shortening the life of the electrical contact point is the present situation.

Due to such a situation, the electric contact material is required to have a longer life than that of the prior art, and improvement in wear resistance is expected, but it is difficult to realize this.

In addition, when closing a pair of electrical contacts in an open state, a very fast and minute mechanical vibration occurs between the electrical contacts, and a chattering phenomenon occurs in which an arc is intermittently generated in a fine gap have.

If this chattering phenomenon occurs, the number of arcs generated between the electrical contacts increases, which leads to an increase in consumption of the electrical contact material. In addition, when the chattering duration is long, the electrical contact material is liable to be welded. Therefore, it is required to shorten the duration of the chattering as much as possible.

Patent Document 1: JP-A-2008-152971 Patent Document 2: JP-A-2012-221759

Here, the problems to be solved by the present invention and the solution thereof will be explained through the description of the configuration of the electrical contacts and the contactors and the consumption mode thereof.

Be one commonly used in the construction of the electrical contacts to be used in a switching device such as a magnetic switch, relay, and adhering the Sterling (純銀) on one side of the cargo Eunsan based electrical contact material such as _{Ag-SnO 2 -In 2 O 3} , And the pure silver surface is used as a contact surface with the support material of the contactor (for example, Patent Document 1).

Since the silver oxide based electrical contact material itself is difficult to be welded when the silver oxide based electrical contact material is directly bonded to the support material of the contactor, the pure silver is bonded to one surface of the electrical contact material, The mechanical strength can not be obtained.

However, even when the pure silver layer is adhered and the surface of the pure silver layer is used as a bonding surface to the contact supporting member to bond the electrode to the contact supporting member, if the number of times of opening and closing in the electrical life test is repeated, It may become a starting point, and consequently may be linked to an increase in contact consumption.

In order to prevent such peeling-off, in the prior art, the arc generated at the time of opening and closing of the contact is guided by an arc horn or the like to prevent the consumption of the electrical contact material and the contact supporting member, And a convex portion of the contact supporting member is provided so that the electrical contact is hardly melted (for example, Patent Document 2).

However, this method can be realized only when the space of the arc-extinguishing chamber can be sufficiently secured or when the volume of the contact-supporting member can be sufficiently secured. Therefore, when the apparatus is downsized, It can not be said that it can necessarily be adopted.

The present invention has been made in view of the above circumstances and it is an object of the present invention to provide an electrical contact material which is easy to be peeled off from the peeling consuming of the electrical contact material and the contact support material, A function of adhering a functional layer made of copper or a copper alloy excellent in thermal conductivity and silver bonding strength to transfer heat generated when the electrical contact material is exposed to electrical opening and closing to the contactor support, An object of the present invention is to provide an electrical contact and a contactor capable of reducing the consumption amount of the electrical contact material and improving the consumptiveness by making the function of preventing the peeling and the like by maintaining the bonding strength between the contact material and the contactor support material.

The copper alloy used for the contact supporting member having a high opening and closing frequency and high mechanical strength is inferior in bonding strength to that of the contact supporting member at the time of bonding the silver supporting surface of the electrical contact material and the contact supporting member.

Thus, for example, in the case of using a copper-based contact supporting member and copper of the same system as the functional layer, it is possible to maintain the mechanical strength of the contact supporting member while maintaining the bonding strength between the electrical contact and the contact supporting member It becomes possible.

Further, instead of making the electrical contact material thinner than the conventional one, the functional layer is thickened, and the electrical contact is formed by using copper or copper alloy, which is softer than the electrical contact and the contact supporting material, in the functional layer, Which is capable of shortening the chattering duration time and reducing the consumption amount of the electrical contact, and to provide a contact.

Thus, by disposing soft copper for the functional layer and hard copper for the contact supporting member requiring mechanical strength, for example, it is possible to shorten the chattering duration.

According to the electrical contact and the contactor of the present invention, a functional layer made of copper or a copper alloy having excellent conductivity, thermal conductivity, and bonding strength with silver is adhered to the surface of the pure silver layer on one side of the electrical contact where peeling- The function of transferring the heat generated when the electrical contact is exposed to the electrical opening and closing to the supporting material, the function of shortening the chattering duration, and the bonding strength of the contact supporting material are maintained, It is possible to reduce the consumption amount of the electrical contact.

The electrical contacts and the contacts obtained as described above can improve the wear resistance by up to about 20% as compared with the conventional electrical contacts when the electrical life test is conducted.

Further, in the prior art, since the gap between the contacts is changed every time the shape such as the thickness of the electrical contact material is redesigned for the purpose of reducing the amount of the noble metal used, it is necessary to change the weight or dimensions of the contactor support material , Thereby requiring a design change of the opening / closing device itself.

However, by using the electrical contact having the functional layer of the present invention, it is possible to reduce the thickness of the electrical contact material without changing the thickness of the electrical contact, so that there is no change in the gap between the contacts, no need. As a result, the cost of various specification changes is reduced, and an inexpensive opening and closing device can be provided.

Further, the electrical contact having the functional layer of the present invention can be applied to any shape or contact support material made of a copper-based material.

1 is a perspective view showing a contactor of Embodiment 1. Fig.
2 is an explanatory view showing a cross section of the electrical contact of the second embodiment.
3 is an explanatory view showing a cross section of the electrical contact and the contact of the second embodiment.

Examples of the present invention and conventional examples are shown in Table 1, and processing steps of the electrical contact material 1 will be described. In the Examples and Comparative Examples, the ratio (%) occupied by the pure silver layer of each electrical contact and the percentage occupied by the functional layer (%), the AC class 3 test (JIS C 8201 -3 and according to JIS C 8201-4-1) are shown in Table 1.

Example 1

A silver alloy material whose composition is 91Ag-5.8Sn-3In-0.2Ni in mass% is prepared by a melting method, and rolling and annealing are repeated to obtain a desired plate. In the present invention, silver alloy such as Ag-Ni alloy or Ag-W alloy used as an electrical contact material or a silver oxide based electrical contact material is subjected to internal oxidation treatment in a subsequent process, Alloy material may be used.

And a pure silver plate having a thickness of 3 to 30% of the total thickness of the electrical contacts to be the pure silver layer 2 on one side of the plate. In the present invention, when the pure silver layer 2 is less than 3% of the thickness of the electrical contact layer, the bonding strength with the functional layer is not preferable. When the pure silver layer 2 is thicker than 30% of the electrical contact layer thickness, There is no remarkable effect on the strength, and the amount of the noble metal used is increased, which increases the material cost.

From this composite material, a rectangular composite material having a side length of 10 mm was obtained through press punching. Barrel polishing and internal oxidation treatment were carried out on the thus obtained 10 mm-thick composite material, and oxygen free Cu (Vickers hardness 74) having a side of 10 mm and a thickness of 1 to 50% of the total thickness of the electrical contacts, To form the electrical contact 4. Further, in the present invention, if the functional layer 3 is less than 1% of the thickness of the electrical contact layer, the effect of reducing the bonding strength with the contact support material and the shortening of the chattering duration is not remarkable, , The thickness of the electrical contact material becomes thinner instead of thickening the functional layer, so that the life of the electrical contact material itself becomes short, which is not preferable. The copper or copper alloy used for the functional layer 3 may be any copper or copper alloy as long as it is tougher than the silver oxide based electrical contact material 1 and the contact supporting material 5. [

The thus obtained electrical contact 4 was solder-joined to the contact supporting member 5 made of oxygen-free Cu (Vickers hardness 110) to form a contact (Fig. 1) (electrical contact type No. 1 to 5).

Example 2

(Fig. 1) in the same manner as in Example 1 except that the functional layer 3 and the contact supporting member 5 were replaced by a Cu alloy of 97Cu-2.6Fe-0.15P-0.25Zn No. 6 to 10). The Vickers hardness of the functional layer was 94 and the Vickers hardness of the contact supporting member was 140.

Example  3

From the composite material obtained in the same manner as in Example 1, a disk-shaped composite material having a diameter of 10 mm? Was obtained through press punching.

The thus obtained composite material having a diameter of 10 mm was subjected to barrel polishing and internal oxidation treatment to form an original plate made of oxygen free Cu (Vickers hardness 74) having a diameter of 10 mm, which is 1 to 50% of the total thickness of the electrical contacts, Bonded to the composite material, and soldered to the rivet-like support material 6 made of oxygen-free Cu (Vickers hardness 110) to form an electrical contact (Fig. 2).

The electrical contact 4 thus formed was caulked and joined to the contact supporting member 5 made of oxygen-free Cu (Vickers hardness 110) by a rivet type supporting member 6 (Fig. 3). 11-15).

Example 4

In the same manner as in Example 3 except that the functional layer 3, the rivet-like supporting member 6 and the contact supporting member 5 were replaced by a Cu alloy of 97Cu-2.6Fe-0.15P-0.25Zn, 3) (electrical contact type No. 16 to 20). The Vickers hardness of the functional layer was 94, and the Vickers hardness of the rivet-like supporting member and the contact supporting member was 140.

Conventional example  One

From the composite material obtained in the same manner as in Example 1, a rectangular composite material having a side length of 10 mm was obtained through press punching. The thus obtained composite material was subjected to barrel polishing and internal oxidation treatment to obtain an electrical contact and brazed to a contact support material made of oxygen-free Cu (Vickers hardness: 110) to obtain the same composite material as that of Example 1 (Contact type No. 21 to 22).

Conventional Example 2

From the composite material obtained in the same manner as in Example 1, a rectangular composite material having a side length of 10 mm was obtained through press punching. The thus-obtained composite material was subjected to barrel polishing and internal oxidation treatment to obtain an electrical contact. Thereafter, a contact support member made of a Cu alloy (Vickers hardness: 140) of 97Cu-2.6Fe-0.15P-0.25Zn and a solder joint , And the same contacts as those of Example 2 were produced (with or without the functional layer) (electrical contact type No. 23 to 24).

Conventional Example 3

From the composite material obtained in the same manner as in Example 1, a disk-shaped composite material of 10 mm in diameter was obtained through press punching. The thus obtained composite material was subjected to barrel polishing and internal oxidation treatment to obtain an electrical contact, which was brazed to a rivet-like support material (Vickers hardness 110) made of oxygen-free Cu, and a contact support material Hardness of 110), and the same contacts as those of Example 3 were produced with or without the functional layer (electrical contact type No. 25 to 26).

Conventional example  4

From the composite material obtained in the same manner as in Example 1, a disk-shaped composite material of 10 mm in diameter was obtained through press punching. The thus obtained composite material was subjected to barrel polishing and internal oxidation treatment to obtain an electrical contact. Thereafter, a rivet-like supporting member made of a Cu alloy (Vickers hardness: 140) of 97Cu-2.6Fe-0.15P-0.25Zn and a solder joint And contact bonding material (Vickers hardness: 140) of 97Cu-2.6Fe-0.15P-0.25Zn was caulked and bonded to produce the same contacts as those of Example 4 except for the functional layer (electrical contact type No. 27 to 28) .

Table 1 shows the results obtained by mounting the contactors fabricated in Examples 1 to 4 and Conventional Examples 1 to 4 on a magnet switch having a rating of 80 A and evaluating the actual consumptiveness of the consumables. In addition, as for the condition of actual skill evaluation, it was decided to perform AC3 class test (440V, 80A) as stipulated in JIS C 8201 and to perform up to one million times about the number of opening and closing.

As for the amount of consumption, the weight change of the contactor before and after the AC3 test was measured, and the percentage of the mass after the AC3 test before the AC3 test was shown as a percentage.

As a result, in Examples 1 to 4, it was confirmed that the consumed amount of the electrical contact was reduced by about 10 to 20% as compared with the conventional examples 1 to 4, and it was demonstrated that the wear resistance of the electrical contact was improved.

Further, the same test was performed by replacing only the contactor support 5 of Example 1 with a Cu alloy (Vickers hardness of 140) of 97Cu-2.6Fe-0.15P-0.25Zn, but the consumed amount was equal to that of Example 1.

The same test was carried out by changing the rivet type support material 6 and the contactor support material 5 of Example 3 to a Cu alloy of 97Cu-2.6Fe-0.15P-0.25Zn (Vickers hardness of 140) It was equivalent to Example 3.

[Table 1]

1: Electrical contact material
2: pure silver layer
3: functional layer
4: Electrical contact
5: Contact support material
6: rivet-shaped support member

Claims (5)

An electrical contact comprising a silver alloy capable of constituting a contact by bonding to a support material,
Wherein a pure silver layer is formed on one surface of an electrical contact material made of a silver alloy and a functional layer made of copper or a copper alloy is adhered to a surface facing the one surface. The method according to claim 1,
Wherein the thickness of the pure silver layer is 3 to 30% of the total thickness of the electrical contacts. The method according to claim 1,
Characterized in that the thickness of the layer of copper or copper alloy is 1 to 50% of the total thickness of the electrical contacts. A contactor characterized in that the functional layer provided on the electrical contact according to claim 1 is joined to a supporting member. 5. The method of claim 4,
Wherein the support member has a rivet shape.

Images