JP2777120B2 - Ag-oxide-based material and method for producing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Ag-oxide-based material mainly used for medium-load electrical contacts and a method for producing the same. [0002] Conventionally, Ag has been used as a medium-load electric contact.
Alternatively, there is a so-called Ag-oxide-based material in which an oxide such as Cd, Sn, Zn, or In is added to Ag-Ni or Ag, which is widely used because of its excellent contact characteristics such as welding resistance and wear resistance. Have been. [0003] Such Ag-oxide materials improve the contact characteristics by dispersing about 5 to 30 Wt% of oxide in Ag, but on the other hand, the plastic deformability is remarkably reduced. As the amount of oxides increases, it becomes difficult to process them into strips. That is, 5 to 30 W in Ag
When sintering Ag-oxide-based powder, pieces, grains or short wires dispersed in t% after sintering, the strength between the powder, pieces, grains or short wires is so small that cracks are easily generated by drawing or the like,
In particular, when the amount of the oxide exceeds 8 Wt%, the tendency is remarkably exhibited, and it becomes extremely difficult to process the wire or the strip. Therefore, in order to increase the strength between these powders and grains, for example, as shown in JP-A-54-33207, a layer rich in Ag is formed around Ag-oxide flakes, JP-A-54-33206 and JP-A-54-34
As disclosed in Japanese Patent No. 057, there is a method in which an Ag layer is formed on the outer periphery of an Ag alloy having internal oxidizing ability, processed to a predetermined size, and then subjected to internal oxidation to oxidize a solute metal. [0005] According to the above-mentioned prior art, the former is not simple in the process of forming an Ag-rich layer around powders and grains, and has problems in terms of technology and cost. The latter has a problem that a contact layer characteristic is deteriorated because a thin layer of oxide is formed at the center of the strip after the internal oxidation treatment. [0006] Accordingly, the present invention provides Ag
An Ag-oxide-based material in which 5 to 30 Wt% of oxide is dispersed therein has a thickness of 0.02 to 0.3 mm of Ag on the outer peripheral surface.
Characterized by forming an outer shell of Ag-Ni in which 0.01 to 1 Wt% of Ni is added to Ag, and further forming an Ag-oxide system in which 5 to 30 Wt% of oxide is dispersed in Ag. An Ag-Ni jacket obtained by adding 0.01 to 1 Wt% of Ni to Ag is hot-pressed at a temperature of 600 ° C. or more on the outer peripheral surface of the material, and then processed to a predetermined diameter to form Ag-Ni. Is characterized by being manufactured with a thickness of 0.02 to 0.3 mm. In the above, the amount of Ni is set to 0.01 to 1 W
The reason why the content is limited to t% is that if the content is less than 0.01 Wt%, it is insufficient to obtain an effective reinforcement of the internal base material because the increase in the grading tension is small, and if it exceeds 1 Wt%, the solid solution in Ag rapidly increases. The reason for this is that a uniform material is not obtained and the workability is adversely affected. When the thickness of the Ag-Ni layer is 0.02-
The reason for setting the thickness to 0.3 mm is that if the thickness is less than 0.02 mm, the strength of the coating layer is so small that the coating layer cannot withstand the tension at the time of drawing and may be broken. The layer thickness is 0.3m
If it exceeds m, Ag in the commonly used strip dimensions
This is because the contact amount such as welding resistance is deteriorated due to an excessive amount. The reason why the amount of oxide is set to 5 to 30 Wt% is that the present invention is not required if the amount of oxide is less than 5 Wt%,
When the content exceeds t%, contact stability among contact characteristics is particularly deteriorated. Embodiments of the present invention will be described below with reference to the drawings. Ag8900g, Cd1000g,
100 g of Sb was melted in a high-frequency melting furnace, and the molten metal was powdered by water atomization. This powder was internally oxidized at 700 ° C., and the molded and sintered material 1 was added to Ag at 0.1 Wt% of Ni.
Is added to the Ag-Ni cylinder 2 to which the Ag-Ni is added.
The Ni lid 3 was welded. The thickness of the cylinder is set to be about 0.02 mm when it is formed into a wire having a diameter of 3 mm. The composite pillaret was heated to 600 ° C. and formed into a rod having a diameter of 10 mm by hot extrusion. Then, annealing and drawing were repeated to obtain a composite wire having a diameter of 3 mm. Similarly, the sixth embodiment was obtained from the second embodiment. [Table 1] According to the present invention described in detail above, A
By forming a layer in which a small amount of Ni was added to Ag on the outer periphery of the g-oxide material, as shown in the table, there was no surface cracking and good workability. The wire was broken during the drawing process with a diameter of 6 mm, and Nos. 1, 2, and 6 were workable, but had surface cracks. As described above, the drawing ability is improved, and the production of the contact strip can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a state in which a cylinder is filled with an Ag-oxide material. [Description of References] 1 Ag-oxide material 2 tube 3 lid

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01H 11/04 H01H 11/04 B

Claims (1)

(57) [Claims] Ag in which 5 to 30 Wt% of oxide is dispersed in Ag
0.02 to 0.3 m thickness on the outer surface of the oxide material
Ag to which 0.01 to 1 Wt% of Ni is added to Ag of
An Ag-oxide-based material having a Ni jacket. 2. Ag in which 5 to 30 Wt% of oxide is dispersed in Ag
-0.01 to 1 Wt on Ag on the outer peripheral surface of the oxide material
% Ni-added Ag-Ni jacket is hot-pressed at a temperature of 600 ° C. or more, and then processed into a predetermined diameter.
A method for producing an Ag-oxide-based strip, wherein the thickness of g-Ni is 0.02 to 0.3 mm.