JPH06314586A - Composite material for discharge electrode - Google Patents

Abstract

PURPOSE:To prevent oxidation so as to provide a stable discharge electrode characteristic by covering Ni or an Ni alloy with Pt, a Pt alloy, or Au, an Au alloy. CONSTITUTION:A discharge electrode made from an Ni alloy is covered with Pt, a Pt alloy or Au, an Au alloy all of which are chemically stable, so as to prevent oxidation and to improve a discharge electrode characteristic through thermally and electrically stable characteristics. The thickness of the cover is 0.04 to 2.5% of the diameter of wire. Below that range, the effect of covering is small and it is difficult to achieve stable covering at uniform thickness; above that range, the cost increases and no corresponding effect can be expected. The strength at which a discharge electrode machine is joined to the cover is secured and the condition for an effective heat treatment to restrain diffusion is 500 to 1000 deg.C. Below that temperature range, removal of distortion and annealing become insufficient, while when that range is exceeded a core and an outer cover material are diffused from each other, resulting in the deterioration of their characteristics. Materials are combined by pipe insertion method or extrusion method, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for an electrode accompanied by electric discharge, and more particularly to a composite consisting of a core material and an outer coating material used under conditions, environments and atmospheres associated with chemical, thermal and electrical erosion. It is about materials.

[0002]

2. Description of the Related Art Conventionally, Ni-based alloy materials and the like have been used as materials for electrodes accompanied by discharge because of their excellent arc wear resistance. However, these alloy materials tend to form a strong coating due to oxidation, and therefore, when oxides are deposited, there is a problem that discharge characteristics are impaired and stable characteristics cannot be obtained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a composite material for a discharge electrode, which is stable and has good discharge characteristics in which it is difficult to oxidize and therefore oxides do not easily deposit.

[0004]

The discharge electrode composite material of the present invention is characterized in that the outer periphery of Ni or Ni-based alloy material is coated with Pt, Pt alloy, Au or Au alloy.

[0005]

The composite material for a discharge electrode of the present invention constructed as described above is chemically stable Pt, Pt alloy, Au or A.
Since the outer circumference of Ni or a Ni-based alloy material is coated with a u alloy, Pt, Pt alloy, Au, or Au which is hard to oxidize and therefore hard to deposit an oxide, and which is also thermally and electrically stable
Together with the characteristics of the alloy, the characteristics of the discharge electrode of Ni or a Ni-based alloy material are further improved. The coating thickness is preferably 0.04 to 2.5% of the wire diameter. If it is less than 0.04%, the coating effect is small, uniform thickness is difficult, and stable coating is difficult. No further effect can be expected, and more expensive Pt, Pt alloy, Au, or Au alloy imposes price restrictions. In order to secure the bonding strength between Ni or a Ni-based alloy material and Pt, Pt alloy, Au or Au alloy, or to prevent diffusion, A
A composite material having g, Cu, Ni, Mo, etc. interposed may be used. Furthermore, the effective heat treatment condition to secure the bonding strength and suppress the diffusion is preferably 500 ° C to 1000 ° C. If it is less than 500 ° C, strain removal and annealing due to heat treatment are insufficient, and if it exceeds 1000 ° C, the core material This is because the characteristics of the core material and the jacket material are impaired due to mutual diffusion of the jacket material and the jacket material. As the composite method, a pipe insertion method, an extrusion method, dry plating, wet plating, or the like is appropriately selected.

[0005]

EXAMPLES Examples and conventional examples will be described below. First, as an example, as shown in Table 1 below, the outer diameter is 8.6 mm, the inner diameter is 8 mm,
Material Pt pipe material, outer diameter 7.9mm, material Inconel (Ni8
(0% Cr14% Fe6%) is inserted, and after drawing wire, the temperature is 800
After heat treatment in the atmosphere H ₂ + N _{2 for} 60 minutes at ℃,
Further, wire drawing was performed. Thereafter, heat treatment and wire drawing were repeated to obtain a composite material for discharge electrode of Example 3 having an outer diameter of 1.0 mm. Similarly, Examples 1, 2, 4 and Comparative Examples 1, 2,
The discharge electrode composite material of No. 3 was used. On the other hand, as a conventional example,
The outer diameter is 8mm and the material is Inconel (Ni80% Cr14
% Fe6%) and Ni bar wire drawing and heat treatment
The discharge electrode material of Conventional Examples 1 and 2 having a thickness of 1.0 mm was used. However,
Each of the composite materials of Examples, Comparative Examples and Conventional Example was cut into a length of 20 mm and used as a discharge test sample with a voltage of 3000 V and an electrode distance
A discharge test was conducted under the test conditions of 1.0 mm, 60 Hz / sec, and continuous discharge time of 300 H. As a result, the results are summarized as shown in Table 1 below. Here, the wire breakage during wire drawing was due to embrittlement due to diffusion, cracking of the jacket material due to unbonding, and the like. The wear (mm) after the discharge test was due to oxidative consumption at the + electrode.

[0006]

[Table 1]

[0007]

As is clear from the above results, according to the discharge electrode composite material of the present invention, chemically or thermally stable Pt, Pt alloy, Au or Au alloy is Ni or Ni. Since the outer periphery of the base alloy material is coated, it is difficult to oxidize, and thus it is difficult to deposit an oxide, and it has an excellent effect that good and stable discharge electrode characteristics can be obtained.

Claims (1)

[Claims] 1. The outer periphery of Ni or Ni-based alloy material is P
A composite material for a discharge electrode, which is coated with t, Pt alloy, Au, or Au alloy.