JPH0356633A - Copper alloy for trolley wire - Google Patents

Abstract

PURPOSE:To obtain the copper alloy for a trolley wire having excellent current collecting-sliding wear resistance, heat resistance, heat radiating properties and strength by specifying the compsn. constituted of Zr, Cr and Cu and furthermore restricting the content of inevitable impurities such as Sn and Si. CONSTITUTION:The compsn. contg., by weight, 0.001 to 0.15% Zr and 0.01 to 0.30% Cr, furthermore contg., at need, total <=0.5% of one or more kinds among <=0.3% Mg, <=0.5% Zn, <=0.2% Ag and <=0.5% Cd and the balance Cu with inevitable impurities in which the content of Sn is restricted to <=50ppm, Si to <=50ppm, P to <=30ppm, Fe to <=50ppm, Ni to <=50ppm, Pb to <=20ppm, As to <=20ppm, Sb to <=20ppm, Bi to <=20ppm and S to <=10ppm is formed, by which the copper alloy for a trolley wire having various excellent characteristics can be obtd. By using the alloy, a trolley wire suitable to the application at high speed with large capacity can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a copper alloy for trolley wires that has excellent current collection sliding wear resistance, heat resistance, heat dissipation properties, and strength.

[Conventional technology]

Traditionally, pure copper, typically tough pitch copper, has been used for trolley wires for transportation, such as electric train lines.
Due to the trend toward high-speed transportation, Ag-containing copper and Sn-containing copper have come to be used. However, with the development of high-speed, large-capacity means of transportation, such as the Shinkansen Line, conventional materials have caused significant mechanical and thermal damage and wear to the trolley wire, resulting in high-speed current collection performance, high-speed current collection noise, and maintenance. Improvements are required due to costs and other reasons.

[Problem to be solved by the invention]

The conventionally used Ag-containing copper cannot cope with the current high speeds due to its wear resistance, and the commonly used Sn-containing copper is superior to Ag-containing copper in terms of wear resistance. However, there is a need for a better material for trolley wires because of increased wear due to higher speeds and larger capacities, and poor heat resistance due to heat generation.

[Means for Solving the Problems] In view of this, the present invention has developed a copper alloy for trolley wires that has excellent current collection sliding wear, heat resistance strength, heat dissipation properties, etc. and is suitable for high speed and large capacity. It was developed.

That is, one of the alloys of the present invention contains Zr0.001 to 0.15w
1% (hereinafter W (abbreviated as %), C r 0. Of
~0.30%, the remainder Cu and Sn 50ppm or less, Si 50ppm or less, P 30111111 or less,
Fe 50ppm or less, Ni 50ppl or less, p
b 20ppm or less, A 8 20ppm or less, Sb
2θppnt or less, B i 20ppm or less, SIOp
It is characterized by consisting of unavoidable impurities limited to pm or less.

Another alloy of the present invention is Zr0.001-0.1
5%, C r 0. 01~0. Contains 3% and further M
G03% or less, Zn0.5% or less, Ag (1.2% or less, Cd 0.5% or less, including any one or more of them in a total of 0.5% or less, the balance being Cu and Sn 50ppm or less, Si 50ppm or less, P 30ppm or less, F
e 50ppm or less, N i 5Qppm or less, P
b 20ppn or less, A s 20ppm or less, S b
20ppm or less, Bi20ppm or less, 8 1011
It is characterized by consisting of unavoidable impurities limited to 11111 or less.

[Function] The reason why the alloy composition in the present invention is limited as described above is due to the following Rizan.

Zr content is 0. 001 ~0. 15%, Cr-containing T
= r ffi was limited to 0.0l~0.30% because
Both Zr and Cr improve abrasion resistance and heat-resistant strength by existing as dispersed particles in copper, but the effect is not seen below the lower limit, and when the upper limit is exceeded, the abrasion resistance and heat-resistant strength decrease. This is because, although it improves, a high conductivity of 90% 1^CS or higher cannot be obtained. Note that within the scope of the present invention, the effect is high because the dispersed particles are very fine and present in high density.

Next, in the unavoidable impurities, S n 50 ppm1 or less, Si
50 ppm or less, P 30 pllffi or less, Fe
soptn or less, Ni 50ppm or less, p b 2
0ppm or less, A s 20ppm or less, S b 20
ppm or less, B i 20ppm or less, Slftppm
The reason for limiting it to the following is to obtain high heat dissipation, which is a feature of the present invention. Within the above range, the influence is small, but if IT is included beyond this range, not only will the heat dissipation decrease, but also Si , P tend to form coarse precipitates with Cr, which is a component of the present invention, and reduce Crfft, which contributes to wear resistance, thereby reducing its effectiveness. Also, PbSAs, Sb, Bi
SS exists as coarse particles in copper or concentrates at grain boundaries, causing reheat cracking or hot working cracking during hot working, and impairing the integrity of the surface of the trolley wire.

Furthermore, Mg 0.396 or less, Zn 0.5% or less, Ag 0.
2% or less, Cd[l. The reason for adding one or more of them in a total amount of 0.5% or less within the range of 5% or less is to increase the life cycle of the trolley wire without significantly reducing sheet heat properties. In particular, Mg, Ag and Cd improve heat resistance and abrasion resistance, and Zn improves corrosion resistance and arc resistance.

However, if the content exceeds that of upper silver, the effect will be small and the heat dissipation will be significantly reduced.

In the present invention, a copper alloy solid solution is formed indirectly or directly by a hot underwater extrusion method or a continuous casting method using a water-cooled mold, and then processed into a trolley wire, track treated, etc.

〔Example〕

The present invention will be explained in detail below with reference to Examples.

Copper is melted in an Ar atmosphere, and then Mg, Zn, Ag,
After adding Cd and further adding Cr and Zr, they were sufficiently stirred and dissolved to form a copper alloy with a diameter of 20 mm having the composition shown in Table 1.
O I! It was cast into an ingot of lmφ. This was heated to about 980° C. and held for 0.5 hours, and then hot water-cooled extrusion was performed to obtain a rough wire having a diameter of 25 mmφ. Surface grinding, cold wire drawing, and aging heat treatment are repeated in sequence, resulting in a total of 17
Processed into 〇1 grooved trolley wire.

This trolley wire was examined for tensile strength, heat resistance, current collection sliding abrasion resistance, and arc resistance f/k. The results are shown in Table 2.

The tensile strength is II322241+. :Based on room temperature (20
℃).

For heat dissipation, conductivity is used as a substitute for IISH057.
Measured based on 5.

Current collector sliding wear was measured by placing the test materials in an annular shape on a disk with a diameter of 5 m, and contacting them with a pantograph equipped with a copper-based sintered composite as a sliding plate with a pushing force of 5 kg l.
A was slid at a speed of 50 km/'h+ without lubrication while energizing, and the amount of wear after 100,000 strokes was measured.

Arc resistance was determined by passing a steady current of 50 A AC between the copper-based sintered metal contact plate and the test material, repeating contact and disconnection 200 times, generating an arc, and measuring the amount of wear at that time.

As is clear from Tables 1 and 2, the trolley wire made of the alloy of the present invention exhibits almost the same conductivity TX↑no1 as the trolley wire made of the conventional alloy, and the other characteristics are far superior. I know it's excellent.

On the other hand, a trolley wire made of comparative gold outside the composition range of the alloy of the present invention has excellent strength, heat resistance, etc., but is inferior in electrical conductivity.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a trolley wire that has excellent current collection sliding wear resistance, heat resistance, heat resistance, and strength for high speed and large capacity. This has a remarkable industrial effect.

Claims (2)

[Claims] (1) Zr0.001-0.15wt%, Cr0.01
~0.30wt%, balance Cu and Sn 50ppm or less, Si 50ppm or less, P 30ppm or less, Fe50
ppm or less, Ni50ppm or less, Pb20ppm or less, As20ppm or less, Sb20ppm or less, Bi20
A copper alloy for trolley wires characterized by containing unavoidable impurities limited to ppm or less and S10 ppm or less. (2) Zr0.001-0.15wt%, Cr0.01
~0.30wt%, further Mg0.3wt% or less,
Zn 0.5wt% or less, Ag 0.2wt% or less, Cd0
．． Contains a total of 0.5 wt% or less of any one or more types within a range of 5 wt% or less, the balance being Cu and Sn 50 ppm or less, Si 50 ppm or less, P 30 ppm or less, Fe50
ppm or less, Ni50ppm or less, Pb20ppm or less, As20ppm or less, Sb20ppm or less, Bi20
A copper alloy for trolley wires characterized by containing unavoidable impurities limited to ppm or less and S10 ppm or less.