CN115889480A - Preparation method of high-conductivity ultrafine ultrahigh-strength diamond wire bus - Google Patents
Preparation method of high-conductivity ultrafine ultrahigh-strength diamond wire bus Download PDFInfo
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 57
- 239000010432 diamond Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 238000009713 electroplating Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 30
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 238000007747 plating Methods 0.000 claims abstract description 23
- 238000005406 washing Methods 0.000 claims abstract description 18
- 238000005238 degreasing Methods 0.000 claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 9
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 239000000344 soap Substances 0.000 claims abstract description 4
- 239000000839 emulsion Substances 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000007547 defect Effects 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005261 decarburization Methods 0.000 claims description 7
- PEVJCYPAFCUXEZ-UHFFFAOYSA-J dicopper;phosphonato phosphate Chemical group [Cu+2].[Cu+2].[O-]P([O-])(=O)OP([O-])([O-])=O PEVJCYPAFCUXEZ-UHFFFAOYSA-J 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 229910001562 pearlite Inorganic materials 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 229910001369 Brass Inorganic materials 0.000 description 9
- 239000010951 brass Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000004381 surface treatment Methods 0.000 description 5
- 238000010622 cold drawing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
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- 238000011056 performance test Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
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- 230000032683 aging Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
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- 239000002210 silicon-based material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
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Abstract
The invention relates to a preparation method of a high-conductivity ultrafine ultrahigh-strength diamond wire bus, which comprises the steps of selecting cold-drawn pearlitic steel wires, sequentially carrying out degreasing, austenitizing, salt bath, alkali washing, acid washing, electroplating, soap soaking and drying to obtain a diamond wireThe tensile strength of the steel wire for the bus is 1350MPa to 1500MPa, the gram weight of a plating layer is not less than 10g/kg, the copper content is 100 percent, and the thickness of the plating layer is not less than 1.5 mu m; the steel wire is subjected to wet drawing, the deformation amount is 4.0-5.5, the drawing speed is not lower than 4m/s, the drawing pass is 28-33, the average pass compression ratio is 15-20%, a diamond wire bus finished product with the diameter of 25-55 mu m and the tensile strength of 4500-6000 MPa can be obtained, and particularly the conductivity of the superfine ultrahigh-strength diamond wire bus is not lower than 3.70 multiplied by 10 6 S/m, effectively improving the electroplating efficiency and quality of the diamond wire; compared with the traditional electroplating process, the novel electroplating process reduces 7 working procedures, and has great economic value and popularization significance.
Description
Technical Field
The invention relates to the technical field of superfine steel wires for diamond wires, in particular to a preparation method of a high-conductivity superfine ultrahigh-strength diamond wire bus.
Background
Diamond wires, i.e., diamond cutting wires, are widely used in the fields of sapphire cutting and photovoltaic silicon wafer cutting. The diamond wire bus is used as a base material and is generally prepared by multi-pass super-large deformation cold drawing of a high-carbon pearlite steel wire plated with a brass plating layer. The brass plating layer not only can provide good lubricating property in the cold drawing process of the high-carbon pearlite steel wire, but also can effectively slow down the corrosion of the steel wire. In addition, in the steel cord industry, brass plating is applied to the surface of a steel wire substrate to improve the adhesion between the steel wire and rubber. In the diamond wire industry, the surface of the bus steel wire is provided with the good brass plating layer, so that the conductivity of the bus can be improved, and the electroplating process of the diamond wire is facilitated.
In recent years, in order to reduce silicon material loss during dicing, thinning of diamond wires has become a necessary trend. In order to realize the ultra-fining development of the diamond wire, the amount of wet drawing deformation is generally required to be increased to prepare the diamond wire bus with a thinner specification. However, as the amount of cold drawing deformation increases, severe plastic deformation of the steel wire occurs, resulting in an increase in the number of defects inside the steel wire, loss of the coating on the surface of the steel wire, and thinning. The above ultra-fine high-carbon pearlite steel wire subjected to severe cold drawing generally has relatively low conductivity, which reduces the electroplating efficiency and electroplating quality of the diamond wire, and increases the risk of plating layer peeling or even wire breakage of the diamond wire during silicon wafer cutting. At present, the conductivity of the finished product of the diamond wire bus can be partially improved to a certain extent by increasing the gram weight of the brass plating layer, but the conductivity of the brass is only about 1-2 times that of the steel material, so that the improvement range of the final conductivity is limited.
Therefore, in order to meet the demand for the development of diamond wire ultra-fining and ensure the electroplating efficiency and the electroplating quality of the diamond wire, it is necessary to search for a new method for improving the conductivity and develop a high-conductivity ultra-fine and ultra-high-strength diamond wire bus.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a high-conductivity superfine ultrahigh-strength diamond wire bus, which has the advantages of simple operation and stable performance.
In order to solve the technical problems, the technical scheme of the invention is as follows: the preparation method of the high-conductivity superfine ultrahigh-strength diamond wire bus has the innovation points that: the preparation method comprises the following steps:
selecting cold-drawn pearlitic steel wires, and sequentially performing degreasing treatment, austenitizing treatment, salt bath treatment, alkali washing treatment, acid washing treatment, electroplating treatment, soap soaking treatment and drying treatment to obtain the steel wires for the diamond wire bus; and then carrying out wet drawing to obtain a finished product of the diamond wire bus.
Further, the cold-drawn pearlite steel wire is obtained by performing primary dry drawing, intermediate heat treatment and secondary dry drawing on a high-carbon pearlite wire rod; the high-carbon steel wire rod has uniform structure, no decarburization and surface defects, 0.92-1.0 wt% of carbon, no less than 90% of sorbite rate, 1100-1400 MPa of tensile strength and no less than 45% of surface shrinkage; the primary dry drawing deformation amount is 1.5-2.0, the secondary dry drawing deformation amount is 2.0-3.5, and the cold-drawn pearlitic steel wire is obtained, and the strength is 3000MPa-3500MPa.
Furthermore, the degreasing treatment uses degreasing fluid with the concentration of 8.5 g/L-9.5 g/L, and the temperature of the degreasing fluid is 90 +/-5 ℃.
Further, the austenitizing temperature is 850-920 ℃, and the heat preservation time is 20-30 s; isothermal quenching adopts a salt bath mode, the temperature is 550-630 ℃, and the holding time is 5-10 s.
Furthermore, the electroplating solution in the electroplating treatment is a copper pyrophosphate solution, the electroplating temperature is 50-55 ℃, the electroplating time is not less than 20s, the gram weight of the coating is not less than 10g/kg, the copper content is 100%, and the thickness of the coating is not less than 1.5 μm.
Further, the sorbite rate of the steel wire for the diamond wire bus obtained after drying treatment is not lower than 95%, the tensile strength is 1350MPa-1500MPa, and the surface shrinkage rate is not lower than 50%.
Furthermore, the wet drawing deformation amount is 4.0-5.5, the drawing speed is not lower than 4m/s, the drawing passes are 28-33 passes, and the average pass compressibility is 10% -20%.
Further, the wet drawing uses emulsion for lubrication and cooling, the emulsion has a refractive index of 3.5-4.5, a pH of 7.5-8.5, a zinc content of 120-150 g/L, a copper content of 180-210 g/L, and an emulsion temperature of 35-50 ℃.
Furthermore, the diameter of the finished product obtained after wet drawing is 25-55 μm, the tensile strength is 4500-6000 MPa, and the conductivity is not lower than 3.70 multiplied by 10 6 S/m。
The invention has the advantages that:
1) The method for producing the high-conductivity superfine ultrahigh-strength diamond wire bus is simple and easy to implement, can be suitable for buses with different carbon contents and specifications, does not need to additionally increase production procedures, can reduce seven procedures compared with the prior art, and effectively reduces the production cost; the produced superfine ultrahigh-strength diamond wire bus can realize the conductivity of not less than 3.70 multiplied by 10 6 S/m; according to the process, the process does not need to carry out galvanizing after copper plating, so that thermal diffusion is not needed, and the strength loss of the steel wire for the diamond wire bus can be effectively avoided; the pure copper plating layer has higher performance than the brass plating layerPlasticity can provide more excellent lubricating property in the wet drawing process, the influence of strain aging of the steel wire can be weakened, and the loss of a wire drawing die can be reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a process flow chart of a preparation method of a high-conductivity ultra-fine ultra-high strength diamond wire bus bar of the invention.
FIG. 2 is a steel wire plating layer morphology diagram of the preparation method of the high-conductivity ultra-fine ultra-high strength diamond wire bus bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
A preparation method of a high-conductivity superfine ultrahigh-strength diamond wire bus comprises the following specific process flows: high-carbon pearlite wire rod → surface treatment → primary dry drawing → intermediate heat treatment → secondary dry drawing → degreasing → austenitizing → salt bath → alkali washing → acid washing → electroplating → soap soaking → drying → wet drawing → wire take-up;
s1: selecting a high-carbon pearlite wire rod with uniform structure, no decarburization and no surface defect, wherein the carbon content is 0.92-1.0 wt.%, the sorbitizing rate is not lower than 90%, the tensile strength is 1100-1400 MPa, and the surface shrinkage rate is not lower than 45%.
S2: after removing oxide skin of the wire rod, firstly carrying out primary dry drawing with the deformation amount of 1.5-2.0, and then carrying out secondary dry drawing with the deformation amount of 2.0-3.5 after intermediate heat treatment to obtain the cold-drawn pearlitic steel wire with the strength of about 3000MPa-3500MPa.
S3: and (3) immersing the cold-drawn pearlitic steel wire into degreasing liquid with the concentration of 8.5 g/L-9.5 g/L and the temperature of 90 +/-5 ℃ for degreasing.
S4: carrying out austenitizing heat treatment on the steel wire, wherein the temperature is 850-920 ℃, and the heat preservation time is 20-30 s; then salt bath treatment is carried out, the temperature is 550-630 ℃, and the heat preservation time is 5-10 s.
S5: and (3) carrying out alkaline washing and acid washing on the steel wire subjected to heat treatment, and then electroplating, wherein the electroplating solution is a copper pyrophosphate solution, the electroplating temperature is 50-55 ℃, the electroplating time is not less than 20s, the gram weight of a coating is not less than 10g/kg, the copper content is 100%, and the thickness of the coating is not less than 1.5 mu m. The sorbite rate of the steel wire is not less than 95 percent, the tensile strength is 1350MPa to 1500MPa, and the surface shrinkage rate is not less than 50 percent.
S6: and immersing the electroplated steel wire into the emulsion for wet drawing, wherein the deformation is 4.0-5.5, the drawing speed is not lower than 4m/s, the drawing passes are 28-33 passes, and the average pass compression ratio is 10-20%. The refractive index of the emulsion is 3.5-4.5, the pH is 7.5-8.5, the zinc content is 120g/L-150g/L, the copper content is 180g/L-210g/L, and the temperature of the emulsion is 35-50 ℃.
S7: and (6) taking up.
Example 1:
a preparation method of a high-conductivity ultra-fine ultrahigh-strength diamond wire bus with the diameter of 50 mu m;
the high carbon pearlite wire rod with uniform structure, no decarburization and no surface defects is selected, wherein 0.92wt.% of C,0.16 wt.% of Si,0.3 wt.% of Mn,0.19 wt.% of Cr and the balance of Fe, the sorbitizing rate is 90%, the tensile strength is 1220MPa, and the face shrinkage rate is 47%.
The wire rod is firstly subjected to primary dry drawing with the deformation amount of 1.8, and then subjected to secondary dry drawing with the deformation amount of 3.0 after intermediate heat treatment to obtain the cold-drawn pearlite steel wire with the strength of about 3000 MPa.
The cold-drawn pearlitic steel wire is immersed in degreasing liquid with the concentration of 8.5g/L and the temperature of 90 ℃ for surface treatment.
Carrying out austenitizing heat treatment on the steel wire, wherein the temperature is 850 ℃, and the heat preservation time is 30s; subsequently, salt bath treatment was carried out at 600 ℃ for 10 seconds.
Electroplating the heat-treated steel wire after alkali washing and acid washing, wherein the electroplating solution is a copper pyrophosphate solution, the electroplating temperature is 50 ℃, the electroplating time is 20s, the gram weight of the coating is about 11.7 g/kg, the copper content is 100%, and the thickness of the coating is about 1.5 mu m, which is shown in figure 2; the steel wire had a sorbite fraction of 95%, a tensile strength of 1440MPa and a surface shrinkage of 51%.
And immersing the electroplated steel wire into the emulsion for wet drawing, wherein the deformation is 4.6, the drawing speed is 8m/s, the drawing pass is 28 passes, and the average pass compressibility is 15%. The refractive index of the emulsion is 3.9, the pH is 8.0, the zinc content is 140g/L, the copper content is 200g/L, and the temperature of the emulsion is 38 ℃.
And (6) taking up the wire.
Example 2:
preparation method of high-conductivity ultra-fine and ultra-high-strength diamond wire bus with diameter of 42 mu m
The high carbon pearlite wire rod with uniform structure, no decarburization and no surface defects is selected, wherein 0.92wt.% of C,0.16 wt.% of Si,0.3 wt.% of Mn,0.19 wt.% of Cr and the balance of Fe, the sorbitizing rate is 90%, the tensile strength is 1220MPa, and the face shrinkage rate is 47%.
The wire rod is firstly subjected to primary dry drawing with the deformation amount of 1.8, and then subjected to secondary dry drawing with the deformation amount of 3.1 after intermediate heat treatment to obtain the cold-drawn pearlite steel wire with the strength of about 3050MPa.
The cold-drawn pearlitic steel wire was immersed in a degreasing solution having a concentration of 9.0g/L and a temperature of 90 ℃ to perform surface treatment.
Carrying out austenitizing heat treatment on the steel wire, wherein the temperature is 900 ℃, and the heat preservation time is 25s; subsequently, salt bath treatment was carried out at 600 ℃ for 10 seconds.
And (3) electroplating the heat-treated steel wire after alkali washing and acid washing, wherein the electroplating solution is a copper pyrophosphate solution, the electroplating temperature is 50 ℃, the electroplating time is 20s, the gram weight of the coating is 11.7 g/kg, the copper content is 100%, and the thickness of the coating is 1.5 mu m. The sorbitizing rate of the steel wire is 96%, the tensile strength is 1420MPa, and the area shrinkage rate is 52%.
And immersing the electroplated steel wire into the emulsion for wet drawing, wherein the deformation is 4.9, the drawing speed is 8m/s, the drawing pass is 31, and the average pass reduction rate is 15%. The refractive index of the emulsion is 4.2, the pH is 8.5, the zinc content is 130g/L, the copper content is 210g/L, and the temperature of the emulsion is 45 ℃.
And (6) taking up the wire.
Example 3:
preparation method of high-conductivity ultra-fine and ultra-high-strength diamond wire bus with diameter of 40 mu m
The high carbon pearlite wire rod with uniform structure, no decarburization and no surface defects is selected, wherein 0.98 wt.% of C,0.20 wt.% of Si,0.29 wt.% of Mn,0.19 wt.% of Cr and the balance of Fe, the sorbitizing rate is 90%, the tensile strength is 1300MPa, and the face shrinkage rate is 45%.
The wire rod is firstly subjected to primary dry drawing with the deformation amount of 1.6, and then subjected to secondary dry drawing with the deformation amount of 3.4 after intermediate heat treatment to obtain the cold-drawn pearlitic steel wire with the strength of about 3150MPa.
The cold-drawn pearlitic steel wire was immersed in a degreasing solution having a concentration of 9.5g/L and a temperature of 95 ℃ to perform surface treatment.
Carrying out austenitizing heat treatment on the steel wire, wherein the temperature is 900 ℃, and the heat preservation time is 25s; subsequently, salt bath treatment was carried out at 615 ℃ for 8 seconds.
And (3) electroplating the heat-treated steel wire after alkali washing and acid washing, wherein the electroplating solution is a copper pyrophosphate solution, the electroplating temperature is 50 ℃, the electroplating time is 30s, the gram weight of the coating is 14.5 g/kg, the copper content is 100%, and the thickness of the coating is 2.2 mu m. The sorbitizing rate of the steel wire is 95 percent, the tensile strength is 1460 MPa, and the surface shrinkage is 50 percent.
And immersing the electroplated steel wire into the emulsion for wet drawing, wherein the deformation is 4.8, the drawing speed is 6 m/s, the drawing pass is 31 passes, and the average pass compressibility is 14%. The refractive index of the emulsion is 4.0, the pH is 8.8, the zinc content is 150g/L, the copper content is 180g/L, and the temperature of the emulsion is 40 ℃.
And (6) taking up the wire.
Example 4:
preparation method of high-conductivity ultra-fine and ultra-high-strength diamond wire bus with diameter of 38 mu m
High-carbon pearlite wire rods with uniform structures and without decarburization and surface defects are selected, wherein 0.92wt.% of C,0.16 wt.% of Si,0.3 wt.% of Mn,0.19 wt.% of Cr and the balance of Fe, the sorbite rate is 90%, the tensile strength is 1200MPa, and the face shrinkage rate is 50%.
The wire rod is firstly subjected to primary dry drawing with the deformation amount of 1.8, and then subjected to secondary dry drawing with the deformation amount of 3.0 after intermediate heat treatment to obtain the cold-drawn pearlite steel wire with the strength of about 3050MPa.
The cold-drawn pearlitic steel wire was immersed in a degreasing solution having a concentration of 9.5g/L and a temperature of 95 ℃ to perform surface treatment.
Carrying out austenitizing heat treatment on the steel wire, wherein the temperature is 900 ℃, and the heat preservation time is 25s; subsequently, salt bath treatment was carried out at 615 ℃ for 8 seconds.
And (3) electroplating the heat-treated steel wire after alkali washing and acid washing, wherein the electroplating solution is a copper pyrophosphate solution, the electroplating temperature is 50 ℃, the electroplating time is 30s, the gram weight of the coating is 14.5 g/kg, the copper content is 100%, and the thickness of the coating is 2.2 mu m. The sorbitizing rate of the steel wire is 95 percent, the tensile strength is 1430MPa, and the face shrinkage rate is 51 percent.
And immersing the electroplated steel wire into the emulsion for wet drawing, wherein the deformation is 5.2, the drawing speed is 4m/s, the drawing pass is 31 passes, and the average pass compressibility is 15%. The emulsion had a refractive index of 4.2, a pH of 8.5, a zinc content of 140g/L, a copper content of 190g/L and a temperature of 44 ℃.
And (6) taking up the wire.
Comparative example 1
The method is the same as the embodiment 2, except that pure copper is electroplated and then the galvanization is carried out, zinc sulfate is used as the galvanization solution, the temperature is 25 ℃, and the galvanization time is 10s; then carrying out surface thermal diffusion at 560 ℃ for 8s; finally, cleaning the surface of the steel wire by adopting phosphoric acid; the gram weight of the plating layer is 12g/kg, the copper content is 72 percent, and the thickness of the plating layer is 2.0 mu m.
Comparative example 2
The same as in example 2 except that the wet drawing speed was 4m/s.
Comparative example 3
The same as example 2 except that the plating time was 40 seconds, the grammage of the plated layer was 20g/kg, the copper content was 100%, and the thickness of the plated layer was 2.5. Mu.m.
And (3) performance test results:
samples of the steel wires of the diamond wire bus bars of the above examples and comparative examples were sampled and subjected to various performance tests, and the test results are shown in table 1. Comparative examples 1 to 4 have found that, for the ultra-high strength diamond wire bus with different carbon contents and diameters, as long as the steel wire matrix structure and the emulsion are controlled within the range specified in the claims, the gram weight of the plated layer after electroplating is controlled to be not less than 10g/kg, the copper content of the plated layer is 100%, and the wet drawing speed is not less than 4m/s, the bus conductivity can be not less than 3.70 x 10 6 And (5) S/m. Comparing example 2 with comparative example 1, it can be seen that pure copper plating is more advantageous than brass plating to maintain high conductivity for the diamond wire bus bar. In fact, this is because pure copper has a conductivity about 4 times higher than brass. Comparing example 2 with comparative example 2, it can be seen that for a diamond wire busbar plated with pure copper, the higher the wet drawing speed, the higher the busbar conductivity, which may be attributed to dynamic recrystallization of heavily deformed copper at high deformation rate, reducing the number of defects inside the plating. Comparing example 2 with comparative example 3, it can be found that for the diamond wire bus with pure copper plating, the higher the grammage of the plating layer before wet-drawing, and the higher the grammage of the plating layer after wet-drawing, the conductivity of the final diamond wire bus can be obviously improved.
Table 1 results of performance test of samples of diamond wire bus steel wires of examples and comparative examples
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A preparation method of a high-conductivity superfine ultrahigh-strength diamond wire bus is characterized by comprising the following steps: the preparation method comprises the following steps:
selecting cold-drawn pearlitic steel wires, and sequentially performing degreasing treatment, austenitizing treatment, salt bath treatment, alkali washing treatment, acid washing treatment, electroplating treatment, soap soaking treatment and drying treatment to obtain the steel wires for the diamond wire bus; and then carrying out wet drawing to obtain a finished product of the diamond wire bus.
2. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the cold-drawn pearlitic steel wire is obtained by performing primary dry drawing, intermediate heat treatment and secondary dry drawing on a high-carbon pearlitic wire rod; the high-carbon steel wire rod has uniform structure, no decarburization and surface defects, the carbon content is 0.92-1.0 wt.%, the sorbite rate is not lower than 90%, the tensile strength is 1100-1400 MPa, and the area shrinkage rate is not lower than 45%; the primary dry drawing deformation amount is 1.5-2.0, the secondary dry drawing deformation amount is 2.0-3.5, and the cold-drawn pearlitic steel wire is obtained, and the strength is 3000MPa-3500MPa.
3. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the degreasing treatment uses degreasing fluid with the concentration of 8.5 g/L-9.5 g/L, and the temperature of the degreasing fluid is 90 +/-5 ℃.
4. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the austenitizing temperature is 850-920 ℃, and the heat preservation time is 20-30 s; isothermal quenching adopts a salt bath mode, the temperature is 550-630 ℃, and the heat preservation time is 5-10 s.
5. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the electroplating solution in the electroplating treatment is a copper pyrophosphate solution, the electroplating temperature is 50-55 ℃, the electroplating time is not less than 20s, the gram weight of the plating layer is not less than 10g/kg, the copper content is 100%, and the thickness of the plating layer is not less than 1.5 mu m.
6. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the sorbitizing rate of the steel wire for the diamond wire bus obtained after the drying treatment is not lower than 95%, the tensile strength is 1350MPa-1500MPa, and the surface shrinkage rate is not lower than 50%.
7. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the wet drawing deformation is 4.0-5.5, the drawing speed is not lower than 4m/s, the drawing passes are 28-33 passes, and the average pass compressibility is 10-20%.
8. The method for preparing the high-conductivity ultra-fine and ultra-high strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the wet drawing uses emulsion for lubrication and cooling, the emulsion has a refractive index of 3.5-4.5, a pH of 7.5-8.5, a zinc content of 120-150 g/L, a copper content of 180-210 g/L, and an emulsion temperature of 35-50 ℃.
9. The method for preparing the high-conductivity ultrafine and ultrahigh-strength diamond wire bus bar according to claim 1, wherein the method comprises the following steps: the diameter of the finished product obtained after wet drawing is 25-55 μm, the tensile strength is 4500-6000 MPa, and the conductivity is not lower than 3.70 multiplied by 10 6 S/m。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118875044A (en) * | 2024-09-29 | 2024-11-01 | 青岛华钨新材料有限公司 | A diamond wire cold drawing process optimization method and system based on artificial intelligence |
| CN119811519A (en) * | 2024-12-19 | 2025-04-11 | 哈尔滨工业大学 | A diamond wire drawing heat treatment process-performance data model and strength-plasticity intelligent optimization method |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118875044A (en) * | 2024-09-29 | 2024-11-01 | 青岛华钨新材料有限公司 | A diamond wire cold drawing process optimization method and system based on artificial intelligence |
| CN119811519A (en) * | 2024-12-19 | 2025-04-11 | 哈尔滨工业大学 | A diamond wire drawing heat treatment process-performance data model and strength-plasticity intelligent optimization method |
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