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A Preparation Method of Cu-Cr-Zr Alloy Ribbon Based on Subrapid Solidification

A sub-rapid solidification, cu-cr-zr technology, applied in the field of metallurgy, can solve the problems of difficult to control the type, size and shape of strengthening phase, limited solid solution or strengthening effect, low solubility of Cr and Zr, etc. The effect of reducing cold rolling reduction and suppressing segregation

Inactive Publication Date: 2020-05-05
NORTHEASTERN UNIV LIAONING
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  • Description
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Problems solved by technology

[0003] Cu-Cr-Zr alloys are typical age-strengthened high-strength and high-conductivity copper alloys. They have high strength and good electrical and thermal conductivity. They are widely used in high-strength and high-conductivity fields. The lead frame material required by the performance requirements of large-scale integrated circuits; but there are still many problems in the preparation process: mainly the low solubility of Cr and Zr in copper in the traditional process, the maximum solid solubility is 0.65% (1076 ℃) and 0.15% (966°C), the effect of solid solution or strengthening is limited, and the requirements for equipment are high; the type, size and shape of the strengthening phase during the aging process are difficult to control, resulting in great differences in performance and structure even with the same composition; so , a copper billet preparation process that can realize continuous improvement of solidification efficiency and facilitate subsequent cold rolling / extrusion processing has become an important goal of everyone's development

Method used

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  • A Preparation Method of Cu-Cr-Zr Alloy Ribbon Based on Subrapid Solidification
  • A Preparation Method of Cu-Cr-Zr Alloy Ribbon Based on Subrapid Solidification
  • A Preparation Method of Cu-Cr-Zr Alloy Ribbon Based on Subrapid Solidification

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Experimental program
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Effect test

Embodiment 1

[0029] Process such as figure 1 As shown, the Cu-Cr-Zr alloy melt is smelted according to the design composition, and its composition contains Cr0.5% by mass percentage, Zr0.15%, impurities≤0.05%, and the rest is Cu;

[0030] The molten Cu-Cr-Zr alloy melt enters the tundish through the gate, the superheat is controlled at 55±5°C, the tundish preheating temperature is 1000°C, and then poured into the twin-roll strip casting machine through the tundish for continuous casting. Obtain a cast strip with a thickness of 3.0mm. Spray water to cool the cast strip immediately after it leaves the casting roll. Control the cooling rate of the cast strip to 70±5°C / s, and take it up when it cools to 350°C; control the liquid level to 60mm during the continuous casting process. The roll speed is 40m / min; the metallographic structure of the cast strip is as follows figure 2 As shown, composition segregation detection (electron probe) as image 3 As shown in the figure, it can be seen that...

Embodiment 2

[0035] Method is with embodiment 1, and difference is:

[0036] (1) Cu-Cr-Zr alloy melt, its composition contains Cr 0.8%, Zr 0.1% by mass percentage;

[0037] (2) Control the degree of superheat to 60±5°C, the preheating temperature of the tundish to 1100°C, the thickness of the cast strip to be 1.0 mm, the cooling rate of the cast strip to be 65±5°C / s after it comes out of the casting roll, and coil it when it cools to 300°C; During the casting process, the liquid level is controlled to 50mm, and the roll speed is 35m / min;

[0038] (3) The total reduction rate of cold rolling is 85%; the thickness of cold rolled thin strip is 0.15mm;

[0039] (4) The aging treatment temperature is 400°C, time is 4h, the tensile strength of the Cu-Cr-Zr alloy strip is 610MPa, the electrical conductivity is 84.5%IACS, and the hardness is 240HV.

Embodiment 3

[0041]Method is with embodiment 1, and difference is:

[0042] (1) Cu-Cr-Zr alloy melt, its composition contains Cr 1.0% and Zr 0.2% by mass percentage;

[0043] (2) Control superheat to 85±5°C, tundish preheating temperature to 1150°C, casting strip thickness to 2.0mm, cooling speed of casting strip to 75±5°C / s after leaving the casting roll, coiling when cooling to 320°C; During the casting process, the liquid level is controlled to 70mm, and the roll speed is 45m / min;

[0044] (3) DSC analysis was carried out on the cast strip sample after coiling, and there was an endothermic peak at 970°C, so it was solid solution treated at 970°C for 0.5h, water quenched to room temperature, and DSC analysis was performed again, and the results showed that there was no obvious endothermic process ;

[0045] (4) The total reduction rate of cold rolling is 90%; the thickness of cold rolled thin strip is 0.2mm;

[0046] (5) The aging treatment temperature is 450°C, the time is 2h, the te...

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Abstract

A Cu-Cr-Zr alloy thin strip preparation method based on sub-rapid solidification comprises the following steps that (1) Cu-Cr-Zr alloy melt is smelted according to design components, and the components comprise 0.5-1.5% of Cr, 0.1-0.2% of Zr and the balance Cu; (2) the smelted Cu-Cr-Zr alloy melt is poured into a tundish, the superheat temperature is controlled to be 50-100 DEG C, then the smeltedCu-Cr-Zr alloy melt is poured into a double-roller thin strip casting rolling machine, discharged from the rollers and subjected to water cooling in sequence; (3) multi-pass cold rolling is conducted, and the total reduction rate is 85-95%; and (4) aging treatment is conducted at the temperature of 350-500 DEG C. Due to the fact that molten metal can directly form an approximate finished thin strip, uniformized annealing, hot rolling and other technologies can be omitted through the method, the solid solubility of the Cr in the Cu is improved through sub-rapid solidification, segregation of the Cr and the Zr is effectively inhibited, the yield is increased, the cost is obviously reduced, after aging, the tensile strength is larger than or equal to 567 MPa, the electric conductivity is larger than or equal to 80% IACS, energy saving, emission reduction, technology simplification and production reduction are achieved, and meanwhile, the thin strip excellent in comprehensive performanceis finally obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing Cu-Cr-Zr alloy thin strips based on sub-rapid solidification. Background technique [0002] With the rapid development of my country's economy, the demand for high-performance copper alloys in the manufacturing industry is increasing. In recent years, my country's copper consumption and production have begun to rank first in the world. The purpose of strengthening the research and development of high-strength conductive copper alloys is to provide high-performance, low-cost conductive copper materials for electric power, electrical appliances, machinery manufacturing and other industrial sectors. [0003] Cu-Cr-Zr alloys are typical age-strengthened high-strength and high-conductivity copper alloys. They have high strength and good electrical and thermal conductivity. They are widely used in high-strength and high-conductivity fields. The lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02C22F1/08B22D11/06
CPCB22D11/0622C22C1/02C22C9/00C22F1/08
Inventor 曹光明王志国李成刚张元祥贾飞刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING
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