CN116790934A - Copper-iron alloy strip for lead frame and preparation method thereof - Google Patents
Copper-iron alloy strip for lead frame and preparation method thereof Download PDFInfo
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- CN116790934A CN116790934A CN202310785369.7A CN202310785369A CN116790934A CN 116790934 A CN116790934 A CN 116790934A CN 202310785369 A CN202310785369 A CN 202310785369A CN 116790934 A CN116790934 A CN 116790934A
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- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910000640 Fe alloy Inorganic materials 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000011282 treatment Methods 0.000 claims description 140
- 238000000137 annealing Methods 0.000 claims description 58
- 238000005097 cold rolling Methods 0.000 claims description 49
- 238000004140 cleaning Methods 0.000 claims description 34
- 238000005098 hot rolling Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 abstract description 9
- 239000012535 impurity Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 16
- 238000001514 detection method Methods 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 208000034656 Contusions Diseases 0.000 description 1
- 238000007545 Vickers hardness test Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000009519 contusion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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Abstract
The invention relates to a copper-iron alloy strip for a lead frame, which comprises the following components in percentage by mass: p0.010wt% -0.100 wt%; fe 2.0wt% -3.0 wt%; RE 0.005-0.05 wt%; cu and impurity balance; wherein, RE is selected from: la or/and Ce. The copper-iron alloy strip for the lead frame controls Fe by controlling the mass percentage of P element and Fe element 3 The grain size of the second phase P is refined by adding La element or/and Ce element; preparation of the inventionThe method can obviously reduce the surface roughness and glossiness of the strip material, thereby meeting the performance parameter requirements of the lead frame.
Description
Technical Field
The invention relates to the technical field of copper alloy, in particular to a copper-iron alloy strip for a lead frame and a preparation method thereof.
Background
The copper-iron alloy has high strength, good conductivity, good heat conductivity, electroplating property, and high temperature softening resistance, but has the following problems: firstly, when a copper-iron alloy (such as C19400) with high iron content is processed into a strip, tolerance fluctuation is large in the rolling process due to the existence of an iron-rich phase, so that the plate shape of the final strip is poor, the performance is uneven, and the subsequent etching processing is not facilitated; secondly, the roughness design of the roller is unreasonable in the rolling process, or the number of cleaning brush rollers, the proportion design are unreasonable in the cleaning process, and the like, so that the surface roughness and the glossiness of the strip obtained by copper-iron alloy processing are high, and the plating strength and the plating uniformity of the subsequent electroplated products are affected.
The copper-iron alloy strip is a main flow matrix material of the lead frame at present, and the surface roughness and glossiness of the matrix material directly influence the effect of the lead frame in etching processing and electroplating processing; the lead frame is used as a carrier of chips of various electronic integrated circuits and is an important medium for connecting internal electronic elements such as chips in the integrated circuits with external wires, and the etching and electroplating effects of the lead frame affect the quality of the final product.
Therefore, there is a need for a copper-iron alloy strip for lead frames and a method of making the same.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art and provides a copper-iron alloy strip for a lead frame and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a first aspect of the present invention provides a copper-iron alloy strip for a lead frame, comprising, in mass percent:
wherein, RE is selected from: la or/and Ce.
Preferably, the copper-iron alloy strip for lead frame comprises: fe with particle size of 100 nm-200 nm 3 And P a second phase.
The mass percentage of the P element and the Fe element is controlled to control Fe formed by the copper-iron alloy strip for the lead frame after cold rolling treatment and annealing treatment 3 The grain diameter of the second phase P further improves the tensile strength and high-temperature softening resistance of the strip; specifically, fe 3 The P second phase can prevent dislocation from sliding in the strip so as to improve the tensile strength of the strip, fe 3 The second phase P is mainly distributed at the lattice, so that the growth of crystal grains under the heat treatment condition of more than 450 ℃ can be effectively inhibited, and the high-temperature softening resistance of the strip is improved; in addition, the mass percent of the P element and the Fe element can lead to Fe 3 The second phase P is spherical or ellipsoidal and has a particle size of 100-200 nm, and if the mass percentage of Fe element is higher than 3.0wt%, fe is 3 The second phase P is grown and agglomerated to a certain extent, becomes hard particles in the rolling process, and causes cracks or peeling of the strip, and if the mass percentage of Fe element is lower than 2.0wt%, the high-temperature softening resistance of the strip is obviously reduced;
la element or/and Ce element is/are added to further improve the high-temperature softening resistance of the strip; specifically, the La element or/and the Ce element can be added to refine crystal grains in the strip, the proportion of grain boundaries after the crystal grains are refined is obviously increased, and according to a Hall formula and a dislocation theory, under the action of external stress, a dislocation source continuously emits dislocation, so that the crystal in the strip slides, after the proportion of the grain boundaries is increased, the dislocation is restrained when moving along a sliding surface, a dislocation network is formed, the dislocation network increases the driving force required by the crystal grains to grow after being heated, and the high-temperature softening resistance of the strip is improved; meanwhile, by adding La element or/and Ce element, the oxygen content in the strip can be reduced from 10 ppm-15 ppm to 5ppm, so that the risk of welding cracking is reduced, namely the welding performance of the strip is improved.
Preferably, the hardness of the copper-iron alloy strip for the lead frame is 100-130 (HV 1), the tensile strength of the copper-iron alloy strip for the lead frame is 350-450 MPa, the elongation after fracture of the copper-iron alloy strip for the lead frame is not less than 10%, the high-temperature softening temperature resistance of the copper-iron alloy strip for the lead frame is not less than 550 ℃, the surface roughness of the copper-iron alloy strip for the lead frame parallel to the rolling direction is less than 0.120 μm, the surface roughness of the copper-iron alloy strip for the lead frame parallel to the rolling direction is less than 500GU, the surface roughness of the copper-iron alloy strip for the lead frame perpendicular to the rolling direction is less than 0.100 μm, and the surface gloss of the copper-iron alloy strip for the lead frame perpendicular to the rolling direction is less than 300GU.
In a second aspect, the present invention provides a method for preparing a copper-iron alloy strip for lead frames, which comprises the following steps:
s1, providing an electrolytic copper plate, and completely melting the electrolytic copper plate;
s2, after adding the copper-iron intermediate alloy, heating to a first temperature and preserving heat for a first time;
s3, after adding the phosphorus-copper intermediate alloy and the rare earth intermediate alloy, heating to a second temperature, preserving heat for a second time, and performing semi-continuous casting to obtain copper-iron alloy;
s4, carrying out hot rolling treatment, face milling treatment, multiple intermediate treatment, last cold rolling treatment and last cleaning treatment on the prepared copper-iron alloy in sequence to obtain the copper-iron alloy strip; wherein,,
each of the intermediate treatments includes: cold rolling treatment and annealing treatment are sequentially carried out;
the adjacent intermediate processing room further comprises: the cleaning treatment or the intermediate treatment is not included: and (3) the cleaning treatment.
Preferably, the hot rolling treatment is performed to control Fe formed 3 Distribution of P second phase.
Preferably, the intermediate treatment is performed a plurality of times toControlling the Fe 3 The particle size of the P second phase is 100 nm-200 nm.
By controlling the feeding steps, the uniformity of Fe element in the strip can be ensured; meanwhile, the P element is ensured not to be burnt seriously on one hand so as to generate Fe with proper proportion 3 P second phase, on the other hand, the content of O element in the strip is reduced by the P element; in addition, the rare earth element can be ensured not to burn seriously so as to play the role of refining grains.
Preferably, the first temperature is 1200 ℃ to 1250 ℃.
Preferably, the first time is 30 min-90 min.
Preferably, the second temperature is 1250 ℃ to 1300 ℃.
Preferably, the second time is 30 min-90 min.
Preferably, in the hot rolling treatment, the temperature is increased to 840 to 900 ℃.
Preferably, in the hot rolling treatment, the heat preservation time is 3-4 hours.
Preferably, in the hot rolling treatment, the total working ratio is not less than 90%.
The heating temperature of the hot rolling treatment can ensure the sufficient solid solution of Fe element and can control Fe at the same time 3 The distribution of the P second phase further avoids agglomeration of strips or blocks, and controls Fe for subsequent treatment 3 The particle size of the second phase P lays a foundation.
Preferably, the intermediate processing includes: the first cold rolling treatment, the first annealing treatment, the first cleaning treatment, the second cold rolling treatment, the second annealing treatment, the third cold rolling treatment, and the third annealing treatment are sequentially performed.
Preferably, in the first cold rolling treatment, the roll roughness is 0.8 μm to 1.0 μm.
Preferably, in the first cold rolling treatment, the reduction ratio is 75% to 85%.
The roughness of the roller in the first cold rolling treatment can meet the roughness requirement of the subsequent cold rolling treatment, if the roughness of the roller is higher than 1.0 mu m, the roughness of the strip cannot be reduced in the subsequent treatment, and if the roughness of the roller is lower than 0.8 mu m, the processing efficiency is obviously reduced, and contusion and scribing can occur on the surface; the processing rate can ensure that recrystallized grains after hot rolling treatment are completely crushed, and lays a foundation for subsequent grain refinement.
Preferably, in the first annealing treatment, a bell furnace annealing is used.
Preferably, in the first annealing treatment, the annealing temperature is 500 ℃ to 550 ℃.
Preferably, in the first annealing treatment, the heat preservation time is 8-12 h.
The parameters of the first annealing process are capable of eliminating the processing stresses associated with the first cold rolling process and reducing the hardness of the strip for subsequent processing, and also ensure that the grains do not grow excessively.
Preferably, in the first cleaning process, three sets of cleaning brushes having mesh numbers of 400 mesh, 600 mesh, and 1200 mesh, respectively, are used.
Preferably, in the first cleaning process, the tape running speed is 15m/min to 35m/min.
Preferably, in the second cold rolling treatment, the roll roughness is 0.2 μm to 0.3 μm.
Preferably, in the second cold rolling treatment, the reduction ratio is 60% to 70%.
Preferably, in the second annealing treatment, an expanding annealing is used.
Preferably, in the second annealing treatment, the annealing temperature is 600 ℃ to 700 ℃.
Preferably, in the second annealing treatment, the tape speed is 15m/min to 45m/min.
Preferably, in the third cold rolling treatment, the roll roughness is 0.15 μm to 0.2 μm.
Preferably, in the third cold rolling treatment, the reduction ratio is 50% to 60%.
Preferably, in the third annealing treatment, an expanding annealing is used.
Preferably, in the third annealing treatment, the annealing temperature is 600 ℃ to 700 ℃.
Preferably, in the third annealing treatment, the tape running speed is 60m/min to 85m/min.
Preferably, in the last cold rolling treatment, the roll roughness is 0.12 μm to 0.15 μm.
Preferably, in the last cold rolling treatment, the processing rate is 30% -40%.
The roll roughness of the second cold rolling treatment, the third cold rolling treatment and the last cold rolling treatment is reduced stepwise to reduce the roughness of the strip and maximize the production efficiency; the processing rates of the second cold rolling treatment, the third cold rolling treatment and the last cold rolling treatment are gradually reduced, so that the plate shape of the strip can be ensured not to generate obvious warping to influence the subsequent processing while the required strength, hardness and elongation after fracture are obtained;
the second annealing treatment and the third annealing treatment can control Fe 3 The particle size of the P second phase is 100 nm-200 nm, and Fe 3 The distribution of the second phase P is uniform.
Preferably, in the last washing treatment, three groups of washing brushes having mesh numbers of 400 mesh, 600 mesh, and 1200 mesh, respectively, are used.
Preferably, in the last cleaning treatment, the tape speed is 50 m/min-70 m/min.
The first cleaning treatment and the last cleaning treatment can brush oxide films on the surface, so that the surface glossiness is reduced, obvious cleaning marks are not formed, and the quality of lead frame products is prevented from being influenced.
Compared with the prior art, the invention has the following technical effects:
the copper-iron alloy strip for the lead frame controls Fe by controlling the mass percentage of P element and Fe element 3 The grain size of the second phase P is refined by adding La element or/and Ce element; the preparation method can obviously reduce the surface roughness and glossiness of the strip, thereby meeting the performance parameter requirements of being applied to lead frames.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be further illustrated, but is not limited, by the following examples.
Example 1
The embodiment provides a copper-iron alloy strip for a lead frame, which comprises the following components in percentage by mass:
wherein, RE is selected from: la or/and Ce.
It should be noted that, in the actual preparation process, the spectrum sampling is affected by various factors such as sampling positions, so that the mass percentages of the elements are in the above ranges, i.e. the chemical components are the same, otherwise, the chemical components are different.
Example 2
The present embodiment provides a method for producing a copper-iron alloy strip for lead frames as described in example 1, comprising the steps of:
s1, providing an electrolytic copper plate, and completely melting the electrolytic copper plate;
s2, after adding the copper-iron intermediate alloy, heating to 1200-1250 ℃ and preserving heat for 30-90 min;
s3, adding the phosphorus-copper intermediate alloy and the rare earth intermediate alloy, heating to 1250-1300 ℃, preserving heat for 30-90 min, and performing semi-continuous casting to obtain the copper-iron alloy;
s4, carrying out hot rolling treatment, face milling treatment, first cold rolling treatment, first annealing treatment, first cleaning treatment, second cold rolling treatment, second annealing treatment, third cold rolling treatment, third annealing treatment, last cold rolling treatment and last cleaning treatment on the prepared copper-iron alloy in sequence to obtain a copper-iron alloy strip;
in the steps S1-S3, the copper liquid is covered by the roasted red charcoal;
in the semi-continuous casting, the casting temperature is 1250-1300 ℃, the casting speed is 50-80 mm/min, and the thickness of the cast ingot is 230mm;
in the hot rolling treatment, a stepping furnace is adopted for hot rolling, the temperature rise is 840-900 ℃, the heat preservation time is 3-4 hours, and the total processing rate is not lower than 90%;
in the surface milling treatment, the thickness of the milling surfaces of the upper surface and the lower surface is 0.5 mm-1.0 mm respectively;
wherein, in the first cold rolling treatment, the roller roughness is 0.8-1.0 mu m, and the processing rate is 75-85%;
wherein, in the first annealing treatment, a bell type furnace is adopted for annealing, the annealing temperature is 500-550 ℃, and the heat preservation time is 8-12 h;
wherein, in the first cleaning treatment, three groups of cleaning brushes with the mesh numbers of 400 meshes, 600 meshes and 1200 meshes are adopted, the rolling reduction is 5-20%, and the tape moving speed is 15-35 m/min;
wherein, in the second cold rolling treatment, the roller roughness is 0.2-0.3 mu m, and the processing rate is 60-70%;
in the second annealing treatment, expansion annealing is adopted, the annealing temperature is 600-700 ℃, and the tape feeding speed is 15-45 m/min;
wherein, in the third cold rolling treatment, the roller roughness is 0.15-0.2 mu m, and the processing rate is 50-60%;
in the third annealing treatment, expansion annealing is adopted, the annealing temperature is 600-700 ℃, and the tape feeding speed is 60-85 m/min;
wherein, in the last cold rolling treatment, the roller roughness is 0.12-0.15 mu m, and the processing rate is 30-40%;
wherein, in the last cleaning treatment, three groups of cleaning brushes with the mesh numbers of 400 meshes, 600 meshes and 1200 meshes are adopted, the rolling reduction is 5-20%, and the tape moving speed is 50-70 m/min.
Application examples 1 to 10 and comparative examples 1 to 14
The mass percentages and the preparation methods as in examples 1-2 were employed to obtain application examples 1-10 and comparative examples 1-14;
the mass percentages of the application examples and the comparative examples are shown in the following table:
the preparation parameters of each application example and comparative example are shown in the following table:
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wherein, the casting temperature of the semi-continuous casting is 1280 ℃ and the casting speed is 60mm/min in the case of using examples 1-10 and comparative examples 1-14 without particular description; the heat preservation time of the hot rolling treatment is 3.5 hours, and the total processing rate is 92%; the milling thickness of the upper surface of the milling treatment is 0.5mm, and the milling thickness of the lower surface is 0.5mm; the heat preservation time of the first annealing treatment is 10h; the reduction of the first cleaning treatment is 15%, and the tape speed is 25m/min; the annealing temperature of the second annealing treatment is 670 ℃, and the tape speed is 35m/min; the reduction of the last cleaning treatment is 20%;
among them, comparative example 12 differs from application example 1 in that: in the last cleaning treatment, two groups of cleaning brushes with the mesh number of 600 meshes and 1200 meshes are adopted;
among them, comparative example 13 differs from application example 1 in that: in the last washing treatment, the reduction amount was 25%.
Detection examples
Hardness, tensile Strength, conductivity, roughness, gloss, high temperature softening temperature resistance, grain size, and Fe for each application example and comparative example 3 The particle size of the second phase P is detected respectively; wherein,,
and (3) hardness detection: according to GB/T4340.0-2009 Vickers hardness test section 1: test method, the size of the test strip is 30mm multiplied by 30mm;
tensile strength detection: according to GB/T228.1-2010 section 1 Metal tensile test: the room temperature test method is carried out on an electronic universal mechanical property tester, the test sample is dumbbell-shaped, the width of the tensile sample is 20mm, and the tensile speed is 5mm/min;
and (3) conductivity detection: the test strip size is 100mm multiplied by 100mm according to GB/T32791-2016 copper and copper alloy conductivity vortex test method;
and (3) roughness detection: the test strip size was 200mm by 200mm according to GB/T1031-1995 surface roughness parameters and their values on a Sanfeng SJ-210 stylus coarseness instrument, japan;
and (3) gloss detection: the test strip sizes were 100mm x 100mm according to DIN 67530-1982 reflectometer as an aid to evaluating the brightness of flat coating (plating) layers and plastic surfaces and ASTM D523-2014 specular gloss test method on a BYKAG-4561 metallic triangle gloss meter, germany;
high temperature resistant softening temperature detection: the method is carried out according to GB/T33370-2016 copper and copper alloy softening temperature test method, wherein the length of a sample is 40mm, and the width of the sample is 40mm;
and (3) detecting the grain size: according to the intercept point method of GB/T6394-2007 metal average grain size determination method, testing the grain size in a photograph collected by a metallographic microscope 100 times, wherein the size of a test strip is 10mm multiplied by 10mm;
Fe 3 particle size detection of the second phase P: performed on a field emission scanning electron microscope JSM-IT700 HR.
Grain size and Fe 3 The results of the detection of the particle size of the P second phase are shown in the preceding table, and the results of the detection of hardness, tensile strength, conductivity, roughness, gloss, and high temperature softening temperature resistance are shown in the following table:
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from the analytical comparison of the table above, it can be seen that:
comparative example 1, in which no rare earth element was added, produced a strip having a higher average grain size and a lower softening temperature;
the P element in comparative example 2 was excessively added, fe of the produced strip 3 The particle size of the P second phase is obviously increased to about 1200nm, and the tensile strength and the hardness are increased, but the conductivity, the elongation after fracture and the softening temperature are reduced;
comparative example 3 hot rolling temperature was 700 ℃ and Fe of the produced strip 3 The second phase P is unevenly distributed, partial agglomeration occurs, and cracking occurs during the first cold rolling treatment;
the first cold rolling treatment in comparative example 4 had a working ratio of 70%, and the produced strip had a higher grain size, a deviation in mechanical properties, and a decrease in softening temperature;
the processing rate of the last cold rolling treatment in comparative example 5 was 20%, and the hardness and tensile strength of the produced strip were low;
the roll roughness of comparative examples 6-9 was varied such that the roughness of the produced strip was significantly increased while affecting the gloss;
the annealing temperature in comparative examples 10 to 11 was increased so that Fe of the produced strip was 3 The second phase P is obviously grown, so that the conductivity and the softening temperature are reduced;
the change in the cleaning parameters in comparative examples 12 to 14 resulted in a significant increase in the gloss of the produced tapes.
In summary, the copper-iron alloy strip for lead frame of the invention controls Fe by controlling the mass percentage of P element and Fe element 3 The grain size of the second phase P is refined by adding La element or/and Ce element; the preparation method can obviously reduce the surface roughness and glossiness of the strip, thereby meeting the performance parameter requirements of being applied to lead frames.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the teachings of the present invention, which are intended to be included within the scope of the invention.
Claims (10)
1. A copper-iron alloy strip for a lead frame, comprising, in mass percent:
wherein, RE is selected from: la or/and Ce.
2. The copper-iron alloy strip for lead frames according to claim 1, wherein said copper-iron alloy strip for lead frames comprises: fe with particle size of 100 nm-200 nm 3 And P a second phase.
3. A method of producing a copper-iron alloy strip for lead frames according to any one of claims 1 to 2, characterized in that the steps include:
s1, providing an electrolytic copper plate, and completely melting the electrolytic copper plate;
s2, after adding the copper-iron intermediate alloy, heating to a first temperature and preserving heat for a first time;
s3, after adding the phosphorus-copper intermediate alloy and the rare earth intermediate alloy, heating to a second temperature, preserving heat for a second time, and performing semi-continuous casting to obtain copper-iron alloy;
s4, carrying out hot rolling treatment, face milling treatment, multiple intermediate treatment, last cold rolling treatment and last cleaning treatment on the prepared copper-iron alloy in sequence to obtain the copper-iron alloy strip; wherein,,
each of the intermediate treatments includes: cold rolling treatment and annealing treatment are sequentially carried out;
the adjacent intermediate processing room further comprises: the cleaning treatment or the intermediate treatment is not included: and (3) the cleaning treatment.
4. According toThe method according to claim 3, wherein the hot rolling treatment is performed to control Fe formed 3 Distribution of P second phase.
5. The method according to claim 4, wherein the intermediate treatment is performed a plurality of times to control the Fe 3 The particle size of the P second phase is 100 nm-200 nm.
6. The method of claim 3, wherein the first temperature is 1200 ℃ to 1250 ℃; the first time is 30-90 min; the second temperature is 1250-1300 ℃; the second time is 30-90 min.
7. The method according to claim 3 or 4, wherein in the hot rolling treatment, the temperature is raised to 840 to 900 ℃, the holding time is 3 to 4 hours, and the total working ratio is not lower than 90%.
8. The method of claim 3 or 5, wherein the intermediate treatment comprises a plurality of times: a first cold rolling treatment, a first annealing treatment, a first cleaning treatment, a second cold rolling treatment, a second annealing treatment, a third cold rolling treatment, and a third annealing treatment that are sequentially performed; wherein,,
in the first cold rolling treatment, the roller roughness is 0.8-1.0 mu m, and the processing rate is 75-85%;
in the second cold rolling treatment, the roller roughness is 0.2-0.3 mu m, and the processing rate is 60-70%;
in the third cold rolling treatment, the roller roughness is 0.15-0.2 mu m, and the processing rate is 50-60%; in the last cold rolling treatment, the roller roughness is 0.12-0.15 mu m, and the processing rate is 30-40%.
9. The method of claim 3 or 5, wherein the intermediate treatment comprises a plurality of times: a first cold rolling treatment, a first annealing treatment, a first cleaning treatment, a second cold rolling treatment, a second annealing treatment, a third cold rolling treatment, and a third annealing treatment that are sequentially performed; wherein,,
in the first annealing treatment, a bell-type furnace is adopted for annealing, the annealing temperature is 500-550 ℃, and the heat preservation time is 8-12 h;
in the second annealing treatment, expansion annealing is adopted, the annealing temperature is 600-700 ℃, and the tape feeding speed is 15-45 m/min;
in the third annealing treatment, expansion annealing is adopted, the annealing temperature is 600-700 ℃, and the tape feeding speed is 60-85 m/min.
10. The method of claim 3 or 5, wherein the intermediate treatment comprises a plurality of times: a first cold rolling treatment, a first annealing treatment, a first cleaning treatment, a second cold rolling treatment, a second annealing treatment, a third cold rolling treatment, and a third annealing treatment that are sequentially performed; wherein,,
in the first cleaning treatment, three groups of cleaning brushes with the mesh numbers of 400 meshes, 600 meshes and 1200 meshes are adopted, and the tape moving speed is 15-35 m/min;
in the last cleaning treatment, three groups of cleaning brushes with the mesh numbers of 400 meshes, 600 meshes and 1200 meshes are adopted, and the tape moving speed is 50-70 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310785369.7A CN116790934A (en) | 2023-06-29 | 2023-06-29 | Copper-iron alloy strip for lead frame and preparation method thereof |
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| CN202310785369.7A CN116790934A (en) | 2023-06-29 | 2023-06-29 | Copper-iron alloy strip for lead frame and preparation method thereof |
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| CN202310785369.7A Pending CN116790934A (en) | 2023-06-29 | 2023-06-29 | Copper-iron alloy strip for lead frame and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117403095A (en) * | 2023-11-15 | 2024-01-16 | 铜陵学院 | Copper alloy material containing rare earth Y and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117403095A (en) * | 2023-11-15 | 2024-01-16 | 铜陵学院 | Copper alloy material containing rare earth Y and preparation method thereof |
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