CN115896512A - Preparation method of copper alloy material for high-precision etched lead frame - Google Patents
Preparation method of copper alloy material for high-precision etched lead frame Download PDFInfo
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- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 119
- 239000000956 alloy Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000005097 cold rolling Methods 0.000 claims abstract description 120
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 65
- 239000010949 copper Substances 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 59
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052802 copper Inorganic materials 0.000 claims abstract description 52
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 230000032683 aging Effects 0.000 claims abstract description 35
- 238000000137 annealing Methods 0.000 claims abstract description 31
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 238000005530 etching Methods 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 51
- 239000002253 acid Substances 0.000 claims description 39
- 239000006063 cullet Substances 0.000 claims description 33
- 239000003610 charcoal Substances 0.000 claims description 31
- 238000005096 rolling process Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000003647 oxidation Effects 0.000 claims description 22
- 238000007254 oxidation reaction Methods 0.000 claims description 22
- 238000004321 preservation Methods 0.000 claims description 16
- 238000003723 Smelting Methods 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 230000003746 surface roughness Effects 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 229910052727 yttrium Inorganic materials 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 4
- 229910017813 Cu—Cr Inorganic materials 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 229910002530 Cu-Y Inorganic materials 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 238000005266 casting Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001887 electron backscatter diffraction Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910017876 Cu—Ni—Si Inorganic materials 0.000 description 3
- ZUPBPXNOBDEWQT-UHFFFAOYSA-N [Si].[Ni].[Cu] Chemical compound [Si].[Ni].[Cu] ZUPBPXNOBDEWQT-UHFFFAOYSA-N 0.000 description 3
- 229910021484 silicon-nickel alloy Inorganic materials 0.000 description 3
- 229910019580 Cr Zr Inorganic materials 0.000 description 2
- 229910019817 Cr—Zr Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910017827 Cu—Fe Inorganic materials 0.000 description 1
- 229910017824 Cu—Fe—P Inorganic materials 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a preparation method of a copper alloy material for a high-precision etching lead frame, which is characterized by comprising the following steps of: (1) upward continuous casting: putting a pure copper rod, high-purity Sn particles, high-purity Zn blocks, a Cu-Cr intermediate alloy, high-purity Nb particles, a Cu-Y intermediate alloy, pure Ni blocks and a covering agent into a crucible, carrying out atmospheric melting, preserving heat for a period of time after the metal is completely melted, and then starting to continuously cast a copper alloy bar; (2) high-temperature aging treatment; (3) cold rolling treatment; (4) low-temperature annealing treatment; and (5) secondary cold rolling treatment. Compared with the prior art, the preparation method has simple process, and the prepared copper alloy material has excellent mechanical, electrical and etching properties.
Description
Technical Field
The invention relates to the technical field of copper alloy, in particular to a preparation method of a copper alloy material for a high-precision etching lead frame.
Background
The lead frame is a key component of the integrated circuit that functions as a conductor, a heat sink, and a support. With the improvement of circuit integration, the lead frame is also developed to high precision, fine pitch and multi-pin, the manufacturing requirement of the lead frame cannot be met due to the poor processing precision of the stamping method, and the etching method becomes the mainstream of manufacturing the lead frame of the large scale integrated circuit. The early lead frame material was FeNi 42 The alloy is gradually replaced by series alloys such as Cu-Fe, cu-P, cu-Fe-P and the like with better strength, electrical conductivity and thermal conductivity, and the development of the very large scale integrated circuit has promoted a great deal of Cu-Ni-Si and Cu-Cr series alloys with higher strength and electrical conductivity since 2010, wherein the Cu-Cr-Sn series alloy has the advantages of easy electroplating, good solderability and the like compared with the Cu-Cr- (Zr) series alloy and the Cu-Ni-Si series alloy, meets the application requirements of the very large scale integrated circuit, and is an ideal material of a lead frame.
At present, the similar products in China have the problems of easy deformation in the etching process, obvious difference of micro-area corrosion rates, poor consistency of surface treatment after etching and the like, can not meet the application requirement of high-precision etching lead frames, and seriously restrict the continuous development of the semiconductor industry in China.
The prior art discloses that the etching lead frame material has much patent protection at home and abroad, and mainly comprises three alloy series, such as Cu-Fe-P series: the invention patent of the invention filed by the japanese corporation SH copper industry, which is a patent publication No. CN105316518a, discloses a copper alloy material, a method of manufacturing the same, a lead frame, and a connector, and the components thereof are Fe:0.2 to 0.6%, ni:0.02 to 0.06%, P:0.07 to 0.3%, mg: 0.01-0.2 percent of copper and inevitable trace impurities, the electric conductivity of the prepared copper alloy material is more than or equal to 75 percent IACS, and the yield strength is more than or equal to 500Mpa. The invention discloses a copper alloy strip for a semi-etched lead frame and a preparation method thereof, and the patent publication number is CN115287495A, and discloses the copper alloy strip for the semi-etched lead frame, which comprises the following components: 2.0 to 3.5%, P:0.03 to 0.05%, zn:0.05 to 0.3%, sn:0.01 to 0.05%, nb:0.1 to 0.5 percent, and the balance of copper and inevitable trace impurities. The method comprises the steps of smelting → semicontinuous casting → hot rolling → rough rolling → softening annealing → intermediate rolling → high-temperature solid solution → finish rolling → aging treatment → finished product rolling → stretch bending straightening → stress relief annealing, and the copper alloy strip which is uniform in structure and in the same direction, has the tensile strength of more than 550MPa, the electric conductivity of more than 60% IACS is prepared, the plate shape degree of the copper alloy strip is less than or equal to 3I, and the warping degree of a half-etched lead frame is less than or equal to 0.10mm. The invention discloses a copper alloy for a high-performance lead frame and a preparation method thereof, and the patent publication number is CN111549252B, and discloses a copper alloy for a high-performance lead frame, which comprises the following components in percentage by weight: 0.2 to 0.6%, P:0.05 to 0.15%, zn:0.1 to 0.2%, co:0.05 to 0.1%, zr:0.01 to 0.1%, ti:0.01 to 0.1 percent, and the balance of copper and inevitable impurity elements. The invention obtains an alloy strip with a tensile strength of 580-630 MPa, an electric conductivity of 78-85% IACS and a softening temperature of 550-575 ℃ by casting → hot rolling → cold rolling → aging → finish rolling → final annealing.
Such as the Cu-Ni-Si series: the invention discloses a copper-nickel-silicon alloy material for a lead frame and a preparation method thereof, wherein the patent publication number is CN106399748A, and discloses the copper-nickel-silicon alloy material for the lead frame and the preparation method thereof, and the copper-nickel-silicon alloy material comprises the following components: ni:0.8 to 1.8%, si:0.15 to 0.35%, P:0.01 to 0.05%, mg:0.10 to 0.15%, fe:0.05 to 0.1 percent, cr:0.2 to 0.4%, zn: 0.07-0.15 percent of the total content of the copper alloy, and at least one or two of V, mn and Ti, wherein the total content of the elements is 0.02-0.5 percent, and the balance is copper. The lead frame material obtained by melting → casting → hot rolling → aging → milling → roughing → medium rolling → on-line solid solution → finish rolling → aging has a tensile strength of 600MPa or more and an electric conductivity of 60% iacs.
As another example, the Cu-Cr- (Zr) series: the invention discloses a high-strength and medium-conductivity novel copper alloy Cu-Zn-Cr-RE conducting bar and a preparation method thereof, wherein the patent publication number is CN106521232B, and the invention discloses the high-strength and medium-conductivity novel copper alloy Cu-Zn-Cr-RE conducting bar and the preparation method thereof, the component percentages are Cr:0.25-0.35%, zn:6-10%, RE:0.05-0.15%, fe:0 to 0.05%, pb:0-0.03 percent, and the balance of copper, the invention obtains the alloy conducting bar with the tensile strength of 330MPa and the elongation of 15 percent after fracture by adjusting the content of alloying elements Zn and RE. The invention discloses a high-strength high-conductivity Cu-Zn-Cr-Zr copper alloy, a preparation method and application thereof, wherein the patent publication number is CN114507793A, and the invention discloses the high-strength high-conductivity Cu-Zn-Cr-Zr copper alloy, which comprises the following components in percentage by weight: 0.1 to 1.0%, cr:0.01 to 0.8%, zr:0.1 to 0.5%, mg:0.05 to 1.0%, ca:0.05 to 1.0%, V:0.05 to 0.2 percent, and the balance of copper. The invention obtains the alloy strip with the tensile strength of more than or equal to 712MPa, the electric conductivity of more than or equal to 70.2% IACS and the elongation after fracture of more than or equal to 4.3% by casting → hot rolling → first quenching → first cold rolling → first aging → second cold rolling → second aging treatment.
As is apparent from the prior art documents, the preparation process of the copper alloy material for the lead frame is generally complex, or has strict requirements on the working capacity of equipment, and places which can be improved still exist, so that the invention further improves the existing preparation method of the high-strength and high-conductivity copper alloy material for the lead frame.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a preparation method of a copper alloy material for a high-precision etched lead frame, which is simple in process, and the prepared copper alloy material has excellent mechanical, electrical and etching properties.
The technical scheme adopted by the invention for solving the technical problem is as follows: a preparation method of a copper alloy material for a high-precision etched lead frame is characterized by comprising the following steps:
(1) Upward continuous casting: putting a pure copper rod, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy, pure Ni blocks and a covering agent into a crucible, carrying out atmospheric smelting, preserving heat for a period of time after the metal is completely molten, and then starting to continuously cast a copper alloy bar;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy row obtained in the step (2) to obtain a copper alloy strip;
(4) Low-temperature annealing treatment: carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3);
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4);
in the step (2), the high-temperature aging treatment specifically comprises the following steps: heating to 580-635 ℃ along with the furnace, preserving the heat for 30-90 min, taking out and then cooling in air.
Preferably, in the step (1), the copper alloy bar consists of the following components in percentage by weight Sn:0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, impurity content less than or equal to 0.05 wt.%, and the balance of Cu.
Preferably, in the step (1), the specific steps of the up-drawing continuous casting are as follows:
firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the covering agent is added in the sequence that the cullet is added firstly, and the charcoal is added after the cullet completely covers the surface of the copper liquid;
then continuously keeping the temperature at 1300-1350 ℃, adding high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks, and keeping the temperature at 1280-1330 ℃ for 3min;
then continuous casting is carried out, wherein the pitch is 2.8-3.5 mm, the drawing speed is 15-20 mm/s, the stop time is 0.2-0.5 s, and the flow of cooling water is more than or equal to 4L/s.
Preferably, in the step (3), the specific steps of the acid washing and cold rolling treatment are as follows: before cold rolling, the copper alloy bar is pickled until the surface has no oxidation and obvious pickling mark, and is cold-rolled after being cleaned, wherein the cold rolling passes are totally 3, and the total strain of the cold rolling is 1.4-1.6.
Preferably, in the step (4), the specific steps of the low-temperature annealing treatment are as follows: heating to 260-280 ℃ along with the furnace, preserving heat for 40-60 min, taking out, air cooling and acid washing until the surface has no oxidation and obvious acid washing mark.
Preferably, in the step (5), the total strain of the copper alloy strip in the cold rolling process is more than or equal to 3.86, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.24-0.38, the total number of passes is 7-11, and the rolling speed is 15-20 m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.10-0.20, 6-14 passes are totally performed, and the rolling speed is 12-15 m/min.
Preferably, in the step (5), the Copper alloy strip after cold deformation has obvious deformation textures in the TD direction, namely a Goss texture and a Copper texture, and the Copper texture is stronger than the Goss texture.
Preferably, in the step (5), the surface roughness Ra of the copper alloy strip after the secondary cold rolling treatment is less than or equal to 0.09 μm, the dent depth of the copper alloy strip is less than or equal to 3 μm, the tensile strength is greater than or equal to 585MPa, the elongation after fracture is greater than or equal to 8%, the electric conductivity is greater than or equal to 78.5%; the twist after etching is less than or equal to 0.50mm, and the lateral bending is less than or equal to 0.04mm.
Compared with the prior art, the invention has the advantages that: the copper alloy material for the high-precision etched lead frame is prepared by the processes of up-drawing continuous casting → high-temperature aging → one-time cold rolling → low-temperature annealing → secondary cold rolling, the process is simple and effective, is suitable for continuous production, has excellent mechanical and electrical properties, simultaneously has good etching performance, meets the application requirements of a very large-scale integrated circuit, and has excellent application value in the field of high-end lead frames.
Drawings
FIG. 1 is an EBSD pole figure along the TD direction at a secondary cold rolling strain of 3.86 for the alloy of example 8.
FIG. 2 is an EBSD pole figure along TD for the alloy of comparative example 2 having a secondary cold rolling strain of 3.86.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept at 1320 ℃, the temperature is kept for 3min at 1280 ℃, and then continuous casting is carried out, wherein the pitch is 2.8mm, the drawing speed is 15mm/s, the stop time is 0.2s, and the flow of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, wherein the specific process comprises the following steps: heating to 635 ℃ along with the furnace, preserving heat for 90min, taking out and then cooling in air;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.4;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 280 ℃ along with the furnace, preserving heat for 60min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.86, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.33, the total number of passes is 8, and the rolling speed is 20m/min; and in the deformation process with the strain exceeding 2.66, the strain of each pass is 0.18, 7 passes are performed in total, and the rolling speed is 15m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.09 μm, the dent depth of the strip was 3 μm, the tensile strength was 592MPa, the elongation after fracture was 8%, and the conductivity was 82.3% IACS; after etching, the film is twisted by 0.45mm and bent by 0.04mm.
Example 2:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the 1330 ℃ is kept to be kept at a constant temperature, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks are added, then the 1330 ℃ is kept at a constant temperature for 3min, and then continuous casting is carried out, wherein the pitch is 2.8mm, the drawing speed is 18mm/s, the stop time is 0.3s, and the flow of cooling water is 4.5L/s, so that a copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 580 deg.C with the furnace, maintaining the temperature for 90min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.5;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 260 ℃ along with the furnace, preserving heat for 60min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.86, the strain per pass in the deformation process with the strain of 0-2.66 is 0.27, the total number of passes is 10, and the rolling speed is 20m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.12, 10 passes are totally performed, and the rolling speed is 12m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.09. Mu.m, the dent depth of the strip was 2.9. Mu.m, the tensile strength was 610MPa, the elongation after fracture was 8%, the electric conductivity was 78.7% IACS; after etching, the film is twisted by 0.50mm and bent by 0.04mm.
Example 3:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that cullet (with the thickness of about 1-2 cm) is added firstly, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept for 1350 ℃, the temperature is kept for 3min at 1300 ℃, and then continuous casting is carried out, wherein the pitch is 2.8mm, the drawing speed is 20mm/s, the stop time is 0.5s, and the flow of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 600 deg.C with the furnace, maintaining for 90min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.6;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 270 ℃ along with the furnace, preserving heat for 50min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.92, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.30, the total number of passes is 9, and the rolling speed is 15m/min; and in the deformation process with the strain exceeding 2.66, the strain of each pass is 0.16, the total number of passes is 8, and the rolling speed is 12m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.08 μm, the indentation depth of the alloy strip was 3 μm, the tensile strength was 603MPa, the elongation after fracture was 9%, and the conductivity was 79.6% IACS; after etching, the film is twisted by 0.45mm and bent by 0.04mm.
Example 4:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the 1330 ℃ heat preservation is continuously kept, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks are added, then the heat preservation is carried out for 3min at 1300 ℃, and then continuous casting is carried out, wherein the pitch is 3.0mm, the drawing speed is 15mm/s, the stop time is 0.2s, and the flow rate of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 635 ℃ along with the furnace, preserving heat for 30min, taking out and then cooling in air;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.4;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 270 ℃ along with the furnace, preserving heat for 50min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.92, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.33, the total number of passes is 8, and the rolling speed is 18m/min; and in the deformation process with the strain exceeding 2.66, the strain of each pass is 0.18, 7 passes are performed in total, and the rolling speed is 12m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.085. Mu.m, the dent depth of the strip was 2.8. Mu.m, the tensile strength was 589MPa, the elongation after fracture was 8.5%, the electric conductivity was 80.9%; after etching, the film is twisted by 0.45mm and bent by 0.04mm.
Example 5:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly, cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept at 1320 ℃, the temperature is kept for 3min at 1330 ℃, and then continuous casting is carried out, wherein the pitch is 3.0mm, the drawing speed is 18mm/s, the stop time is 0.3s, and the flow of cooling water is 4.5L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment has the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 580 deg.C with the furnace, keeping the temperature for 30min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing until the surface of the copper alloy bar is free of oxidation and obvious acid washing marks before cold rolling, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.5;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 280 ℃ along with the furnace, preserving heat for 40min, taking out, air cooling and acid washing until the surface has no oxidation and obvious acid washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.95, the strain per pass in the deformation process with the strain of 0-2.66 is 0.27, the total number of passes is 10, and the rolling speed is 18m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.10, 13 passes are performed in total, and the rolling speed is 14m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.085 μm, the depth of the dents on the strip was 2.8 μm, the tensile strength was 609MPa, the elongation after fracture was 8.5%, and the electric conductivity was 80.1% IACS; after etching, the torsion is 0.50mm, and the lateral bending is 0.04mm.
Example 6:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept at 1300 ℃, heat preservation is continuously carried out, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks are added, then the temperature is kept at 1300 ℃ for 3min, and then continuous casting is carried out, wherein the pitch is 3.0mm, the drawing speed is 20mm/s, the stop time is 0.5s, and the flow rate of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 600 deg.C with the furnace, maintaining the temperature for 30min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.6;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 260 ℃ along with the furnace, preserving heat for 60min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 4.03, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.24, the total number of passes is 11, and the rolling speed is 15m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.10, the total number of passes is 14, and the rolling speed is 14m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.09 μm, the dent depth of the strip was 2.9 μm, the tensile strength was 635MPa, the elongation after fracture was 8%, and the conductivity was 78.5% IACS; after etching, the film is twisted by 0.50mm and bent by 0.04mm.
Example 7:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept 1315 ℃, the temperature is kept for 3min at 1300 ℃, then continuous casting is carried out, wherein the pitch is 3.5mm, the drawing speed is 15mm/s, the stop time is 0.5s, and the flow of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 580 deg.C with the furnace, maintaining the temperature for 60min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.4;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 260 ℃ along with the furnace, preserving heat for 60min, taking out, air-cooling and acid-washing until the surface has no oxidation and obvious acid-washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.92, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.24, the total number of passes is 11, and the rolling speed is 18m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.10, 13 passes are performed in total, and the rolling speed is 14m/min.
The surface roughness of the copper alloy strip obtained in this example was 0.09 μm, the indentation depth of the strip was 3 μm, the tensile strength was 638MPa, the elongation after fracture was 8%, and the conductivity was 78.9% IACS; after etching, the torsion is 0.50mm, and the lateral bending is 0.04mm.
Example 8:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly, cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then, the temperature is kept to 1330 ℃, heat preservation is continuously carried out, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks are added, then, the temperature is kept for 3min at 1320 ℃, and then continuous casting is carried out, wherein the pitch is 3.5mm, the drawing speed is 18mm/s, the stop time is 0.3s, and the flow of cooling water is 4.5L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 600 deg.C with the furnace, maintaining the temperature for 60min, taking out, and air cooling;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.5;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 280 ℃ along with the furnace, preserving heat for 50min, taking out, air-cooling and pickling until the surface has no oxidation and obvious pickling mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.86, the strain per pass in the deformation process with the strain of 0-2.66 is 0.27, the total number of passes is 10, and the rolling speed is 20m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.12, 10 passes are totally performed, and the rolling speed is 15m/min.
FIG. 1 is an EBSD polar diagram along the TD direction when the secondary cold rolling strain of the alloy in the embodiment is 3.86, and it can be seen that the alloy has obvious preferred orientation characteristics, the texture composition is Goss texture with good plasticity ({ 110} <001 >) and Copper texture with general plasticity ({ 112} <11-1 >), and the Copper texture is obviously stronger than the Goss texture.
The surface roughness of the copper alloy strip obtained in this example was 0.085 μm, the dent depth of the strip was 3 μm, the tensile strength was 614MPa, the elongation after fracture was 9%, and the electric conductivity was 79.3% IACS; after etching, the film is twisted by 0.50mm and bent by 0.04mm.
Example 9:
(1) Upward continuous casting: firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the volume ratio of the covering agent to the dehydrated charcoal is 1:3; the covering agent is added in the sequence that firstly cullet (with the thickness of about 1-2 cm) is added, charcoal is added after the cullet completely covers the surface of the copper liquid, then the temperature is kept at 1350 ℃, the temperature is kept for 3min at 1300 ℃, then continuous casting is carried out, wherein the pitch is 3.5mm, the drawing speed is 20mm/s, the stop time is 0.2s, and the flow of cooling water is 4L/s, so that the copper alloy bar is prepared, and the copper alloy bar in the embodiment comprises the following components: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, oxygen content less than or equal to 8ppm, impurity content less than or equal to 0.03wt.%, and the balance of Cu;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment, and the specific process comprises the following steps: heating to 635 ℃ along with the furnace, preserving the heat for 90min, taking out and then cooling in air;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2), carrying out acid washing on the alloy bar before cold rolling until the surface of the alloy bar is free from oxidation and obvious acid washing marks, carrying out cold rolling treatment after cleaning, wherein the total cold rolling pass is 3, and the total cold rolling strain is 1.4;
(4) Low-temperature annealing treatment: and (4) carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3), wherein the specific process comprises the following steps: heating to 260 ℃ along with the furnace, preserving heat for 40min, taking out, air cooling and acid washing until the surface has no oxidation and obvious acid washing mark;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.86, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.38, the total number of passes is 7, and the rolling speed is 20m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.20, 6 passes are totally performed, and the rolling speed is 15m/min.
The surface roughness of the copper alloy strip obtained in the example was 0.09 μm, the indentation depth of the alloy strip was 3 μm, the tensile strength was 585MPa, the elongation after fracture was 10%, and the conductivity was 82.1% iacs; after etching, the torsion is 0.45mm, and the lateral bending is 0.04mm.
Comparative example 1:
(1) Upward continuous casting: in keeping with example 8;
(2) Aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for temperature aging treatment, wherein the specific process comprises the following steps: heating to 450 deg.C with furnace, maintaining the temperature for 90min, taking out, and air cooling;
(3) Cold rolling treatment: in keeping with example 8;
(4) Low-temperature annealing treatment: in keeping with example 8;
(5) Secondary cold rolling treatment: in keeping with example 8.
The surface quality of the copper alloy strip obtained in the comparative example is general, and even microcracks appear on the side edges of the sheet after the cold rolling treatment in the step (3); after the secondary cold rolling treatment, a few wave-shaped defects appear on the alloy strip.
Comparative example 2:
(1) Upward continuous casting: in keeping with example 8;
(2) High-temperature aging treatment: in keeping with example 8;
(3) Cold rolling treatment: in keeping with example 8;
(4) Low-temperature annealing treatment: in keeping with example 8;
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4), wherein the total cold rolling strain of the alloy strip is 3.86, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.45, the total number of passes is 3, and the rolling speed is 20m/min; and in the deformation process with the strain exceeding 2.66, the strain of each pass is 0.24, 5 passes are totally performed, and the rolling speed is 15m/min.
FIG. 2 is an EBSD polar diagram along TD direction when the secondary cold rolling strain of the alloy in this embodiment is 3.86, and it can be seen that the alloy has obvious preferred orientation characteristic, large polar density value and extremely strong Goss texture ({ 110} <001 >).
The surface roughness of the copper alloy strip obtained in this example was 0.085 μm, the depth of indentation of the strip was 3.5 μm, the tensile strength was 553MPa, the elongation after fracture was 8.5%, and the conductivity was 78.7% IACS; after etching, the film is twisted by 0.50mm and bent by 0.05mm.
Comparing fig. 1 and fig. 2 with the performance test results, it can be seen that: in the large deformation process of the Copper alloy, the Copper texture ({ 112} <11-1 >) is more stable in grain orientation, and the Goss texture and the Copper texture are combined (and the Copper texture is stronger than the Goss texture), so that the alloy has excellent mechanical properties.
Claims (8)
1. A preparation method of a copper alloy material for a high-precision etched lead frame is characterized by comprising the following steps:
(1) Upward continuous casting: putting a pure copper rod, high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy, pure Ni blocks and a covering agent into a crucible, carrying out atmospheric smelting, preserving heat for a period of time after the metal is completely molten, and then starting to continuously cast a copper alloy bar;
(2) High-temperature aging treatment: placing the copper alloy bar obtained in the step (1) in a heat preservation furnace for high-temperature aging treatment;
(3) Cold rolling treatment: carrying out acid washing and cold rolling treatment on the copper alloy bar obtained in the step (2) to obtain a copper alloy strip;
(4) Low-temperature annealing treatment: carrying out low-temperature annealing treatment on the copper alloy strip obtained in the step (3);
(5) Secondary cold rolling treatment: carrying out secondary cold rolling treatment on the copper alloy strip obtained in the step (4);
in the step (2), the high-temperature aging treatment specifically comprises the following steps: heating to 580-635 ℃ along with the furnace, preserving the heat for 30-90 min, taking out and then cooling in air.
2. The method of claim 1, wherein: in the step (1), the copper alloy bar consists of the following components in percentage by weight: 0.18wt.%, zn:0.16wt.%, cr:0.20wt.%, nb:0.06wt.%, ni:0.04wt.%, Y:0.04wt.%, impurity content less than or equal to 0.05 wt.%, and the balance of Cu.
3. The method of claim 1, wherein: in the step (1), the upward continuous casting comprises the following specific steps:
firstly, smelting a pure copper rod, adding a covering agent after the pure copper rod is completely molten, wherein the covering agent is a mixture of cullet and dehydrated charcoal, and the covering agent is added in the sequence that the cullet is added firstly, and the charcoal is added after the cullet completely covers the surface of the copper liquid;
then continuously keeping the temperature at 1300-1350 ℃, adding high-purity Sn particles, high-purity Zn blocks, cu-Cr intermediate alloy, high-purity Nb particles, cu-Y intermediate alloy and pure Ni blocks, and keeping the temperature at 1280-1330 ℃ for 3min;
then continuous casting is carried out, wherein the pitch is 2.8-3.5 mm, the drawing speed is 15-20 mm/s, the stop time is 0.2-0.5 s, and the flow of cooling water is more than or equal to 4L/s.
4. The method of claim 1, wherein: in the step (3), the specific steps of the acid washing and cold rolling treatment are as follows: before cold rolling, the copper alloy bar is pickled until the surface has no oxidation and obvious pickling mark, and is cold-rolled after being cleaned, wherein the cold rolling passes are totally 3, and the total strain of the cold rolling is 1.4-1.6.
5. The method of claim 1, wherein: in the step (4), the specific steps of the low-temperature annealing treatment are as follows: heating to 260-280 ℃ along with the furnace, preserving heat for 40-60 min, taking out, air cooling and acid washing until the surface has no oxidation and obvious acid washing mark.
6. The method of claim 1, wherein: in the step (5), the total strain of the copper alloy strip in the cold rolling process is more than or equal to 3.86, the strain of each pass in the deformation process with the strain of 0-2.66 is 0.24-0.38, 7-11 passes are totally performed, and the rolling speed is 15-20 m/min; the strain of each pass in the deformation process with the strain exceeding 2.66 is 0.10-0.20, 6-14 passes are totally performed, and the rolling speed is 12-15 m/min.
7. The method of manufacturing according to claim 6, characterized in that: in the step (5), the Copper alloy strip after cold deformation has obvious deformation textures in the TD direction, namely a Goss texture and a Copper texture, and the Copper texture is stronger than the Goss texture.
8. The production method according to any one of claims 1 to 7, characterized in that: in the step (5), the surface roughness Ra of the copper alloy strip after the secondary cold rolling treatment is less than or equal to 0.09 mu m, the dent depth of the alloy strip is less than or equal to 3 mu m, the tensile strength is more than or equal to 585MPa, the elongation after fracture is more than or equal to 8 percent, and the electric conductivity is more than or equal to 78.5 percent IACS; the twist after etching is less than or equal to 0.50mm, and the lateral bending is less than or equal to 0.04mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116197235A (en) * | 2023-04-28 | 2023-06-02 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020029827A1 (en) * | 1999-01-15 | 2002-03-14 | Jin-Yaw Liu | High-strength and high-conductivity Cu-(Ni, Co, Fe)-Si copper alloy for use in leadframes and method of making the same |
| KR20100094037A (en) * | 2009-02-18 | 2010-08-26 | 주식회사 풍산 | Method of manufacturing a copper alloy for leadframe |
| JP2012046810A (en) * | 2010-08-30 | 2012-03-08 | Dowa Metaltech Kk | Copper alloy sheet material and manufacturing method thereof |
| CN105316518A (en) * | 2014-06-27 | 2016-02-10 | 株式会社Sh铜业 | Copper alloy material, manufacturing method of copper alloy material, lead frame and connector |
| CN106399751A (en) * | 2016-10-13 | 2017-02-15 | 龙岩学院 | Preparing method for high-strength and high-conductivity copper alloy |
| CN106399748A (en) * | 2016-10-05 | 2017-02-15 | 宁波兴业盛泰集团有限公司 | Novel copper-nickel-silicon system alloy material for lead frame and preparation method of novel copper-nickel-silicon system alloy material |
| CN106521232A (en) * | 2016-11-22 | 2017-03-22 | 陕西斯瑞新材料股份有限公司 | High-strength and medium-conductivity novel copper alloy Cu-Zn-Cr-RE conducting bar and preparation method |
| CN110284018A (en) * | 2019-07-22 | 2019-09-27 | 中南大学 | A kind of production method of the high elastic Vulcan metal of environmental protection and its Strip |
| CN111549252A (en) * | 2020-04-17 | 2020-08-18 | 中铝材料应用研究院有限公司 | Copper alloy for high-performance lead frame and preparation method thereof |
| WO2021008428A1 (en) * | 2019-07-17 | 2021-01-21 | 中南大学 | Ultrahigh-strength aluminum-lithium alloy and preparation method therefor |
| CN113699397A (en) * | 2021-08-06 | 2021-11-26 | 中国兵器科学研究院宁波分院 | Preparation process of copper alloy material for short-process lead frame |
| WO2022062335A1 (en) * | 2020-09-25 | 2022-03-31 | 宁波博威合金板带有限公司 | Copper-chromium alloy strip and preparation method therefor |
| CN114507793A (en) * | 2022-01-24 | 2022-05-17 | 中南大学 | High-strength high-conductivity Cu-Zn-Cr-Zr copper alloy, and preparation method and application thereof |
| CN115287495A (en) * | 2022-06-30 | 2022-11-04 | 宁波金田铜业(集团)股份有限公司 | Copper alloy strip for semi-etched lead frame and preparation method thereof |
-
2022
- 2022-12-25 CN CN202211669635.1A patent/CN115896512A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020029827A1 (en) * | 1999-01-15 | 2002-03-14 | Jin-Yaw Liu | High-strength and high-conductivity Cu-(Ni, Co, Fe)-Si copper alloy for use in leadframes and method of making the same |
| KR20100094037A (en) * | 2009-02-18 | 2010-08-26 | 주식회사 풍산 | Method of manufacturing a copper alloy for leadframe |
| JP2012046810A (en) * | 2010-08-30 | 2012-03-08 | Dowa Metaltech Kk | Copper alloy sheet material and manufacturing method thereof |
| CN105316518A (en) * | 2014-06-27 | 2016-02-10 | 株式会社Sh铜业 | Copper alloy material, manufacturing method of copper alloy material, lead frame and connector |
| CN106399748A (en) * | 2016-10-05 | 2017-02-15 | 宁波兴业盛泰集团有限公司 | Novel copper-nickel-silicon system alloy material for lead frame and preparation method of novel copper-nickel-silicon system alloy material |
| CN106399751A (en) * | 2016-10-13 | 2017-02-15 | 龙岩学院 | Preparing method for high-strength and high-conductivity copper alloy |
| CN106521232A (en) * | 2016-11-22 | 2017-03-22 | 陕西斯瑞新材料股份有限公司 | High-strength and medium-conductivity novel copper alloy Cu-Zn-Cr-RE conducting bar and preparation method |
| WO2021008428A1 (en) * | 2019-07-17 | 2021-01-21 | 中南大学 | Ultrahigh-strength aluminum-lithium alloy and preparation method therefor |
| CN110284018A (en) * | 2019-07-22 | 2019-09-27 | 中南大学 | A kind of production method of the high elastic Vulcan metal of environmental protection and its Strip |
| CN111549252A (en) * | 2020-04-17 | 2020-08-18 | 中铝材料应用研究院有限公司 | Copper alloy for high-performance lead frame and preparation method thereof |
| WO2022062335A1 (en) * | 2020-09-25 | 2022-03-31 | 宁波博威合金板带有限公司 | Copper-chromium alloy strip and preparation method therefor |
| CN113699397A (en) * | 2021-08-06 | 2021-11-26 | 中国兵器科学研究院宁波分院 | Preparation process of copper alloy material for short-process lead frame |
| CN114507793A (en) * | 2022-01-24 | 2022-05-17 | 中南大学 | High-strength high-conductivity Cu-Zn-Cr-Zr copper alloy, and preparation method and application thereof |
| CN115287495A (en) * | 2022-06-30 | 2022-11-04 | 宁波金田铜业(集团)股份有限公司 | Copper alloy strip for semi-etched lead frame and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116197235A (en) * | 2023-04-28 | 2023-06-02 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
| CN116197235B (en) * | 2023-04-28 | 2023-06-30 | 太原晋西春雷铜业有限公司 | Mixed hot rolling method for C19400 and C19210 cast ingots |
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