JPH0649562A - Contact material - Google Patents

Abstract

PURPOSE:To obtain a contact material capable of showing high wear resistance and deposition resistance in spite of its low Au ratio and furthermore capable of securing high castability and workability. CONSTITUTION:This contact material consists essentially of Au, Pd, Ag and Ni, and the componental ratios of these Au, Pd, Ag and Ni to their total weight are respectively regulated to the ranges of 20 to 30wt.%, 30 to 40wt.%, 30 to 40wt.% and 1 to 5wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact material suitable for sliding contacts such as slip rings.

[0002]

2. Description of the Related Art Conventionally, as materials for sliding contacts,
An Au alloy having a composition of Ag 22% by weight, Ni 3% by weight, and Au 75% by weight is known. This Au alloy has high wear resistance and is widely used.

However, since this alloy contains 75% by weight of Au, there is a problem that it is relatively expensive and is an obstacle to reduction of product cost.

Therefore, the Au-reduced ratio of Au-
A 40% Ag alloy is also used as a contact material. This Au alloy has an advantage that the product cost can be reduced.

However, although this alloy is relatively low in price, it has the drawback that it is easily worn and welded and cannot be used for contacts that make sliding contact at high speeds or contacts that require durability. Further, when the content of Au is lowered, there arises a problem that the corrosion resistance is insufficient.

In order to eliminate these drawbacks, for example,
It is also practiced to add Pt and / or Pd to this alloy to improve wear resistance and welding resistance.

However, in the Au alloy containing Pt or Pd as described above, casting defects such as pinholes are likely to occur due to the high melting point, and cracks and cracks are likely to occur due to the decrease in ductility. There is a drawback that

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a low Au ratio,
An object of the present invention is to provide a contact material that can exhibit high wear resistance and welding resistance, and can ensure high castability and workability.

[0009]

The contact material according to claim 1 is mainly composed of Au, Pd, Ag and Ni.
The proportions of u, Pd, Ag, and Ni are 20 to 30% by weight, 30 to 40% by weight, and
The range is 30 to 40% by weight and 1 to 5% by weight. Here, if Pd and Ni exceed the above range, there is a problem that castability is deteriorated. Further, if it is less than the above range, there is a problem that hardness and wear resistance are poor. The contact material of the present invention can be manufactured by a conventional casting method.

[0010]

EFFECTS OF THE INVENTION The contact material according to the present invention exhibits high wear resistance and welding resistance.
It is equivalent to the alloy (Ag 22% by weight, Ni 3% by weight, Au 75% by weight). Moreover, in the contact material of the present invention, A
The content of u is much smaller than that of the conventional one, and it is very effective in reducing the product cost.

Further, according to the contact material of the present invention, mainly A
Since g is contained in a predetermined amount, castability and workability can be improved.

Further, according to the contact material of the present invention, the hardness can be changed according to the hardness of the alloy forming the brush or the like used in the sliding contact. That is, by changing the processing rate at the time of manufacturing the sliding contact, the degree of work hardening is changed, and the hardness as the contact is from Hv150 to
It can be adjusted in the range of 250. Therefore, not only the wear resistance of the contact itself can be enhanced, but also the durability of the brush or the like can be enhanced.

【Example】

(Examples 1 to 3 and Comparative Examples 1 and 2) VTR shown in FIG.
As five slip rings 2 attached to the head 1,
What was cast using the contact material having the component composition shown in Table 1 was used. Brushes 3 are slidably contacted to these slip rings 2, respectively, so that an electric signal generated from a VTR head 1 rotating about an axis can be detected. As the material of the brush 3, a commonly used material was used.

VT using the slip ring 2 having the above construction
The R head 1 was rotated, and the reliability of the slip ring 2 at that time was evaluated. The test conditions are as follows. Slip ring rotation speed: 10000 rpm (constant) Slip ring outer diameter: Diameter 5 mm Test time: 3000 hours

Slip ring 2 made of the material of Examples 1 to 3
According to the above, no problem was caused in terms of wear amount, degree of welding, noise, etc., and it was in a sufficiently usable state. Further, the Au alloy according to this example was tested for melting point, hardness, and tensile strength. These results are shown in Table 1.
Shown in.

[0015]

[Table 1]

Also from this result, the Au alloy of this embodiment is
Ag2 which is a conventional sliding contact material shown in Comparative Example 1 below.
Au consisting of 2% by weight, 3% by weight of Ni, and 75% by weight of Au
It can be seen that the sliding contact material has substantially the same durability and welding resistance as alloy materials.

Therefore, according to the contact material of the present embodiment, it is possible to achieve high wear resistance and welding resistance while achieving Au saving, and further, good castability and workability. There are advantages.

[Brief description of drawings]

FIG. 1 is a perspective view of a VTR head using a slip ring made of a contact material according to an embodiment of the present invention.

Claims (1)

[Claims] 1. A main constituent is Au, Pd, Ag, and Ni, and the content ratio of these Au, Pd, Ag, and Ni is 20 to 30% by weight and 30 to 30% by weight based on the total weight of these components.
A contact material in the range of 40% by weight, 30-40% by weight, 1-5% by weight.