Copper-based alloy and its manufacturing method

A copper-based alloy and weight technology, applied in the field of copper-based alloys and their manufacturing, can solve the problems of increased temperature difference and poor thermal processing performance.

Inactive Publication Date: 2004-08-04
DOWA HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned temperature difference between the liquidus and solidus (melting / solidification temperature range) increases, making hot workability worse, and therefore, it is desired to provide a copper-based alloy that can be casted more easily at a high yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8 and comparative example 1-4

[0051] The raw materials of copper-based alloys with the chemical composition shown in Table 1 were packed in a silica crucible as the main component, heated to 1100° C., and kept for 30 minutes. At the same time, the surface of the obtained molten metal was covered with C powder. Afterwards, an ingot of 30 x 70 x 1000 mm was cast with a vertical small continuous casting equipment. Sn-plated copper scraps using JISC2600 (Cu-30Zn) are used as raw materials for each copper-based alloy, the weight percentages of which are shown in Table 1, and oxygen-free copper (JISC 1020), rough Zn ingots and rough Sn ingots are used as adjustment components Other raw materials used. In addition, B, Mg, and Si are added as deoxidizers by melting Cu—B, Cu—Mg, and Cu—Si master alloys together with raw materials. Cr and Ni were added by using Cu-Cr master alloy and coarse Ni ingot. Also, in Comparative Example 4, using commercially available oxygen-free copper chips, the balance was adjusted so ...

Embodiment 9 and 10

[0058] Examples 9 and 10, Comparative Example 5

[0059] To confirm the effect of C on hot workability under mass production conditions, 15000 kg of each copper-based alloy having the chemical composition shown in Table 3 was melted in a crucible mainly composed of silica. Four ingots with dimensions 180x500x3600 mm were obtained from each copper-based alloy using a vertical continuous casting apparatus. In the casting, the copper mold used, in the case of repeated polishing of the mold surface, casts Cu-Zn alloys such as JIS C2600 or JIS C28015000 times or more, and great wear occurs.

[0060] Zn(wt%)

Sn(wt%)

C (ppm)

S(ppm)

O(ppm)

Example 9

25.1

0.82

230

-

30

Example 10

24.8

0.73

90

-

20

Comparative example 5

24.9

0.76

-

10

20

[0061] For the copper-based alloys of Examples 9 and 10, Sn-plated scrap of...

Embodiment 11， comparative example 6 and 7

[0070] In Example 11, in order to confirm the characteristics of the rod material produced as above, the same copper-based alloy as in Example 10 was repeatedly cold-rolled and annealed to obtain a cold-rolled material with a thickness of 1 mm and a grain size of about 10 microns. Then, this cold-rolled material was rolled to a thickness of 0.25 mm and low-temperature annealed at 230° C. in the final step. Samples were obtained from the rods produced.

[0071] For the obtained rods, 0.2% proof stress, tensile strength, Young's modulus, electrical conductivity, stress relaxation rate and stress corrosion cracking life were measured. 0.2% proof stress, tensile strength and Young's modulus were measured according to JIS-Z-2241, and electrical conductivity was measured according to JIS-H-0505. In parallel to the rolling direction, a bending stress is applied on the surface of the sample for a stress relaxation test. The applied bending stress is 80% of the proof stress of 0.2%. T...

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PUM

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Abstract

As a rawmaterial of a copper base alloy containing at least one of 0.2 to 12 wt% of tin and 8 to 45 wt% of zinc, at least one of a copper base alloy having a large surface area and containing carbon on the surface thereof, a copper base alloy having a liquidus line temperature of 1050 DEG C or less, a copper base alloy surface-treated with tin, and a copper base alloy containing 20 to 1000 ppm of carbon, is used for obtaining a copper base alloy having an excellent hot workability. If necessary, when the raw material of the copper base alloy is melted, the material of the copper base alloy may be coated with a solid material containing 70 wt% or more of carbon, or 0.005 to 0.5 wt% of a solid deoxidizer having a stronger affinity with O than C with respect to the weight of the molten metal may be added to the molten metal.

Description

field of invention [0001] The invention relates to a copper-based alloy and a manufacturing method thereof. In particular, the present invention relates to a copper-based alloy having excellent hot press workability and a method of manufacturing the same, which can be used as a material for electric and electronic parts such as connectors. Background technique [0002] In recent years, with the development of the electronics industry, the development of complication and integration of electronic circuits has increased the amount of wrought copper and copper alloys used as materials for electrical and electronic parts such as connectors. In addition, electric and electronic components such as connectors are required to be reduced in weight and cost, and to be improved in reliability. To meet these requirements, copper alloy materials for connectors need to be thinned and pressed into complex shapes, and therefore must be excellent in strength, elasticity, electrical conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C9/02C22C9/04C22F1/08
CPCC22C9/04C22C9/02C22F1/08
Inventor 猪鼻康雄菅原章佐藤敏洋
Owner DOWA HLDG CO LTD
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