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Preparation method capable of remarkably overcoming surface defect of copper alloy material for lead frame

A copper alloy and lead frame technology, which is applied in the field of significantly improving the preparation of copper alloy material surface defects for lead frames, can solve the problems of few varieties and specifications, small production scale, etc., and achieve the goal of improving surface properties, avoiding component segregation, and promoting migration Effect

Active Publication Date: 2017-12-08
安徽晋源铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The domestic production of copper alloy strips for lead frames generally has the disadvantages of small production scale and few varieties and specifications, and the quality has a certain gap compared with similar foreign products.
At present, in the production process of copper alloy lead frame materials, fish scale-like surface defects appear on the surface of the product, which has become an obstacle to improving the yield of the product

Method used

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  • Preparation method capable of remarkably overcoming surface defect of copper alloy material for lead frame

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method for significantly improving surface defects of copper alloy materials for lead frames, comprising the steps of:

[0023] S1, adding high-purity copper and copper-iron alloy into a vacuum arc melting furnace for arc melting to obtain a copper-iron alloy with an iron content of 7%, wherein the high-purity copper is a copper block with blind holes, and the copper-iron alloy is put into copper before smelting in the blind hole of the block;

[0024] S2. Add high-purity copper and charcoal into the high-frequency induction melting furnace, heat up to complete melting to obtain copper liquid, continue to heat up to 1250°C, add S1 to obtain copper-iron alloy, copper-zinc alloy, and copper-phosphorus with an iron content of 7%. Alloys, copper-tin alloys, copper-titanium alloys, and mixed rare earths are stirred and smelted to obtain copper alloy solutions;

[0025] S3, detect the component of copper alloy solution, it comprises by weight percentage: Fe: 0....

Embodiment 2

[0029] A preparation method for significantly improving surface defects of copper alloy materials for lead frames, comprising the steps of:

[0030] S1, high-purity copper and iron content are that 25% copper-iron alloy is added in the vacuum electric arc melting furnace and carry out electric arc melting 4 times, and single smelting time is 15min, obtains the copper-iron alloy that iron content is 7%, wherein, high-purity copper is designed For copper blocks with blind holes, put the copper-iron alloy into the blind holes of the copper blocks before smelting;

[0031] S2. Add high-purity copper and charcoal into the high-frequency induction melting furnace, heat up to complete melting to obtain copper liquid, continue to heat up to 1300°C, add S1 to obtain copper-iron alloy, copper-zinc alloy, and copper-phosphorus with an iron content of 7%. Alloy, copper-tin alloy, copper-titanium alloy, Ce, Rd, stirring and melting to obtain copper alloy solution;

[0032] S3, detect the ...

Embodiment 3

[0036] A preparation method for significantly improving surface defects of copper alloy materials for lead frames, comprising the steps of:

[0037] S1, adding high-purity copper and iron content to 40% copper-iron alloy in a vacuum arc melting furnace for arc melting 5 times, a single smelting time is 10min, to obtain a copper-iron alloy with an iron content of 7%, wherein the high-purity copper is designed For copper blocks with blind holes, put the copper-iron alloy into the blind holes of the copper blocks before smelting;

[0038] S2. Add high-purity copper and charcoal into the high-frequency induction melting furnace, heat up to complete melting to obtain copper liquid, continue to heat up to 1270°C, add S1 to obtain copper-iron alloy, copper-zinc alloy, and copper-phosphorus with an iron content of 7%. Alloy, copper-tin alloy, copper-titanium alloy, Ce, Y, stirring and smelting to obtain copper alloy solution;

[0039] S3, detect the component of copper alloy solution...

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Abstract

The invention discloses a preparation method capable of remarkably overcoming the surface defect of a copper alloy material for a lead frame. The preparation method comprises the following steps that S1, a copper-iron alloy with the iron content being 7% is refined; S2, high-purity copper and wood coal are added into a high-frequency induction smelting furnace, heating is conducted until the high-purity copper is completely melted to obtain copper liquid, heating continues to be conducted, the copper-iron alloy with the iron content being 7%, a copper-zinc alloy, a copper-phosphorus alloy, a copper-tin alloy, a copper-titanium alloy and mixture rare earths are added, and stirring and smelting are conducted to obtain a copper-alloy solution; S3, the components of the copper-alloy solution are detected, and casting is conducted to obtain strips; S4, the strips are subjected to uniform annealing, the annealing temperature is 650-730 DEG C, repeated hot rolling is conducted, then the strips are transferred to be subjected to intermediate annealing finish rolling, the intermediate annealing temperature is 690-710 DEG C, and then a finish rolling product is obtained; and S5, the finish rolling product is subjected to ageing treatment and cooled with a furnace to obtain the copper alloy material, with the surface defect remarkably overcome, for the lead frame. According to the preparation method capable of remarkably overcoming the surface defect of the copper alloy material for the lead frame, uniformization of the copper alloy material for the lead frame is promoted, the surface performance of the alloy material is improved, and the comprehensive performance of the copper alloy material is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of copper alloy materials for lead frames, in particular to a preparation method for significantly improving surface defects of copper alloy materials for lead frames. Background technique [0002] At present, there are more than one hundred kinds of copper alloys for lead frames developed at home and abroad, which can be basically divided into high conductivity type, medium conductivity type, medium strength type, low conductivity type and high strength type according to the performance of the material; It is divided into copper-iron-phosphorus system, copper-chromium-zirconium system, copper-nickel-silicon system and copper-silver system. Although there are many kinds of copper alloy lead frame materials, only KFC, C1220 and C194 are widely used at present. Among them, Cu-Fe-P KFC is one of the most representative high-conductivity materials. [0003] Domestic production of copper alloy st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22F1/08C22C9/02H01L23/495
CPCC22C1/03C22C9/02C22F1/08H01L23/49582
Inventor 潘加明
Owner 安徽晋源铜业有限公司
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