CN102500615A - Method for manufacturing tungsten-copper alloy rods and wires - Google Patents
Method for manufacturing tungsten-copper alloy rods and wires Download PDFInfo
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- CN102500615A CN102500615A CN2011103255189A CN201110325518A CN102500615A CN 102500615 A CN102500615 A CN 102500615A CN 2011103255189 A CN2011103255189 A CN 2011103255189A CN 201110325518 A CN201110325518 A CN 201110325518A CN 102500615 A CN102500615 A CN 102500615A
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Abstract
The invention discloses a method for manufacturing tungsten-copper alloy rods and wires. Tungsten-copper alloy circular ingots are processed into tungsten-copper alloy rods and wires by an even number of times of unwrapped continuous rolling or an even number of times of unwrapped single rolling with a Y-shaped rolling mill unit. The method for manufacturing the tungsten-copper alloy rods and wires has a simple preparation process, and no material loss occurs during the process; compared with a traditional rotary forging process, the heating times are reduced, the energy loss is reduced, no manual feeding is needed, and the performance of manufactured products is stable; compared with an extrusion process, the lengths of the ingots which can be processed are not restricted by the extrusion ratio; after rolling, the Y-shaped rolling mill unit can also manufacture finished rods and wires with the diameters being 3.0mm to 10mm by single-head rotary hammering and chain-type wire drawing; and the products are in various and comprehensive specifications, and the method for manufacturing the tungsten-copper alloy rods and wires is applicable to different scope of application.
Description
Technical field
The invention belongs to the made technical field, be specifically related to a kind of method of making tungsten-copper alloy rod silk material with the machining mode.
Background technology
Tungsten-copper alloy be a kind of tungsten particle and phase composition of face-centred cubic copper bonding by body-centered cubic structure neither mutually solid solution do not form a kind of composite of intermetallic compound yet, be commonly called pseudo-alloy or pseudo-alloy.Therefore; It had both had the characteristic such as high strength, high rigidity, low-expansion coefficient of tungsten; Simultaneously have the characteristics such as high-ductility, favorable conductive and thermal conductivity of copper again, these distinctive combination properties make tungsten-copper alloy be widely used in following field: the 1) electrical contact of all kinds of high-voltage appliance switch; 2) electrode of resistance welded, electric machining; 3) the high temperature parts of contact high-temperature fuel gas in the space technology; 4) electronics sealing-in and heat deposition material; 5) be applied in space flight and the military project, as being used as high explosive anti-tank cartridge cavity liner material and guided missile jet pipe material etc.The product of tungsten-copper alloy, different by the method for its preparation, can be divided into: tungsten-copper alloy goods, tungsten-copper alloy strip material (containing foil), tungsten-copper alloy rod silk material.Wherein tungsten-copper alloy rod silk material is widely used in the association area of trigger electrode, high-voltage switch gear and military project.
The round base that is used to prepare tungsten-copper alloy rod silk material is a sintered powder; Its density is relatively low; There are a large amount of tiny micropores; Cause its proof stress property relatively poor, the performance of tungsten-copper alloy is had suitable adverse influence, thus need be through forging or the mode of extruding make these micropores reduce even disappear to process tungsten-copper alloy rod silk material.But because the processing characteristics of tungsten is bad, material itself is hard and crisp, and processing temperature height and temperature range are narrower, directly tungsten-copper alloy circle base is forged or pushes, and causes the cracking of circle base to be scrapped easily.
In the prior art, the processing method of tungsten-copper alloy rod silk material mainly is to adopt the mode of jacket processing, and promptly the applying pressure machine should be justified base and is pressed in the steel bushing; Adopt interference fit between steel bushing and the circle base; So that the two is combined closely, forge again afterwards or push, form the rod silk material of certain specification.Jacket processing makes the proof stress property enhancing of tungsten-copper alloy circle base, has improved the formability of material, can tolerate repeatedly to swage and push and craze and transfiguration not.But after obtaining specifying the product of specification, also will jacket be removed through mach mode, inevitably produce the waste of material, technological process is comparatively complicated in addition, and is higher with the tungsten-copper alloy rod silk material cost that this method is produced.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of method of utilizing the machining mode to make tungsten-copper alloy rod silk material is provided.
Technical scheme of the present invention is following:
A kind of method of making tungsten-copper alloy rod silk material, with tungsten-copper alloy circle base after car light is handled, through the y-type rolling mill unit not jacket even number road tandem rolling or not jacket single track even number be rolled into tungsten-copper alloy rod silk material A.
Copper mass content is 10%～50% in the said tungsten-copper alloy circle base, and corresponding surplus is a tungsten; This circle base diameter is preferably φ 14.5 ± 0.5mm; This circle base is the round base that infiltration process is produced, the tungsten-copper alloy sintering circle base of perhaps producing through compacting, sintering processing for class composite W-Cu powder, perhaps for class composite W-Cu powder through compacting, sintering, the round base that is crushed to.
With tungsten-copper alloy circle base after car light is handled, preferably through the y-type rolling mill unit not jacket 4 road tandem rollings or not the jacket single track be rolled into the tungsten-copper alloy rod silk material A that diameter is preferably φ 10 ± 0.2mm for 4 times.
The nominal roller of said y-type rolling mill unit directly is φ 220mm, and 4 rolling passes of its 4 road tandem rolling or single track constitute: circle → triangle → six sides → arc triangle → circle, and heating-up temperature is 900 ± 50 ℃, heating atmosphere is a hydrogen, temperature retention time 20 minutes.
The unit of said 4 road tandem rollings is whole transmission, and linear velocity is followed successively by from 4 road rollers footpath, the 1st road to the: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.
Said tungsten-copper alloy rod silk material A revolves hammer equipment single track through single head and repeatedly totally revolves hammer out the tungsten-copper alloy rod silk material B for diameter phi 6.0～φ 10mm.
It is 800 ± 50 ℃ that said single head revolves the heating-up temperature that the hammer single track repeatedly totally revolves hammer, and heating atmosphere is a hydrogen, and the heat tracing time is 20 minutes, and the hammer discharging speed is 0.8～1.2 meter/minute, and the average draft of passage is 8%.
Said tungsten-copper alloy rod silk material B repeatedly adds up drawing through chain type wire drawing single track and becomes the tungsten-copper alloy rod silk material C that diameter is φ 3.0～φ 5.5mm.
The silk material heating-up temperature that said chain type wire drawing single track repeatedly adds up drawing is 300-450 ℃; The mold heated temperature is 400-600 ℃; Process adopts bar surface-coated aquadag as drawing compound, and the drawing speed scope is 1.2～2.0 meters/minute, and the average draft of passage is 5%.
The invention has the beneficial effects as follows:
(1) adopt not jacket processing mode, preparation technology is simple, does not have material unaccounted-for (MUF) in the technical process.
(2) adopt the rolling processing mode of y-type rolling mill, compare with the technology of swaging, reduced the heating number of times, reduced energy consumption, do not need hand fed, the properties of product of production are stable; Compare with extrusion process, the length of the base material that can process is not squeezed than restriction.
(3) can also revolve hammer, chain type wire drawing through single head after the rolling completion of y-type rolling mill unit and produce diameter phi 3.0mm～φ 10mm rod silk material finished product, the specification of product is many and complete, adapts to different ranges of application.
Description of drawings
Fig. 1 is embodiment 1 a tungsten-copper alloy circle base metallographic sketch map;
Fig. 2 is embodiment 1 a tungsten-copper alloy rod silk material A metallographic sketch map;
Fig. 3 is embodiment 5 a tungsten-copper alloys circle base metallographic sketch map;
Fig. 4 is embodiment 5 a tungsten-copper alloys rod silk material A metallographic sketch map.
The specific embodiment
Below will combine instance that the present invention is further specified:
Embodiment 1
With the tungsten-copper alloy diameter that the copper content of infiltration process preparation is 28%, tungsten is corresponding surplus is that φ 14.5 ± 0.5mm, length are that the round base of 400mm is after the processing of car light; In hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 900 ℃ the resistance furnace; Feed nominal roller and directly be the y-type rolling mill unit of φ 220mm; Through 4 road tandem rollings, time processing is to the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm, and the unit of 4 road tandem rollings is mass motion; Its pass is changed to circle → triangle → six sides → arc triangle → circle, and roller footpath linear velocity is followed successively by: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.Continuation in hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 800 ℃ the resistance furnace; Sending into single head revolves the hammer machine and carries out single track and revolve hammer processing; Carry out single track repeatedly, repeatedly totally revolve the hammer deformation processing by the step of above-mentioned heating+revolve hammer; Control hammer discharging speed is 0.8～1.2 meter/minute, and the passage draft so continues the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm to be machined to the tungsten-copper alloy rod silk material B of diameter phi 6.0 ± 0.2mm 8%.At last; On chain drawbench, be that 450 ℃, mold heated temperature are 550 ℃, are 5% to carry out drawing process as lubricant, drawing speed by 1.2～2.0 meters/minute controls, passage drafts with bar surface-coated aquadag with the tungsten-copper alloy of diameter phi 6.0 ± 0.2mm rod silk material B again by silk material heating-up temperature; Carry out single track, repeatedly drawing processing so repeatedly, continue to be machined to the tungsten-copper alloy rod silk material C of diameter phi 4.0 ± 0.05mm until tungsten-copper alloy rod silk material B diameter phi 6.0 ± 0.2mm.
Its raw material and rolling after metallographic contrast, see Fig. 1 and Fig. 2.
Fig. 1 is that copper mass content 28%, tungsten are the diameter phi 14.5mm tungsten-copper alloy circle base metallographic sketch map of corresponding surplus; Fig. 2 is that copper mass content 28%, tungsten are the tungsten-copper alloy rod silk material A metallographic sketch map of diameter phi 14.5mm tungsten-copper alloy circle base gained diameter phi 10mm behind 4 tandem rollings of corresponding surplus.
Embodiment 2
With the tungsten-copper alloy diameter that the copper content of infiltration process preparation is 28%, tungsten is corresponding surplus is that φ 14.5 ± 0.5mm, length are that the round base of 400mm is after the processing of car light; In hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 850 ℃ the resistance furnace; Feed nominal roller and directly be the y-type rolling mill unit of φ 220mm; Through 4 road tandem rollings, time processing is to the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm, and the unit of 4 road tandem rollings is mass motion; Its pass is changed to circle → triangle → six sides → arc triangle → circle, and roller footpath linear velocity is followed successively by: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.Continuation in hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 750 ℃ the resistance furnace; Sending into single head revolves the hammer machine and carries out single track and revolve hammer processing; Carry out single track repeatedly, repeatedly totally revolve the hammer deformation processing by the step of above-mentioned heating+revolve hammer; Control hammer discharging speed is 0.8～1.2 meter/minute, and the passage draft so continues diameter phi 10 ± 0.2mm tungsten-copper alloy rod silk material A to be machined to the tungsten-copper alloy rod silk material B of diameter phi 6.0 ± 0.2mm 8%.At last; On chain drawbench, be that 400 ℃, mold heated temperature are 600 ℃, are 5% to carry out drawing process as lubricant, drawing speed by 1.2～2.0 meters/minute controls, passage drafts with bar surface-coated aquadag with the tungsten-copper alloy of diameter phi 6.0 ± 0.2mm rod silk material B again by silk material heating-up temperature; Carry out single track, repeatedly drawing processing so repeatedly, continue to be machined to the tungsten-copper alloy rod silk material C of diameter phi 3.0 ± 0.05mm until tungsten-copper alloy rod silk material B diameter phi 6.0 ± 0.2mm.
Embodiment 3
With the tungsten-copper alloy diameter that the copper content of infiltration process preparation is 28%, tungsten is corresponding surplus is that φ 14.5 ± 0.5mm, length are that the round base of 400mm is after the processing of car light; In hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 900 ℃ the resistance furnace; Feed nominal roller and directly be the y-type rolling mill unit of φ 220mm; Through 4 road tandem rollings, time processing is to the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm, and the unit of 4 road tandem rollings is mass motion; Its pass is changed to circle → triangle → six sides → arc triangle → circle, and roller footpath linear velocity is followed successively by: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.Continuation in hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 800 ℃ the resistance furnace; Sending into single head revolves the hammer machine and carries out single track and revolve hammer processing; Carry out single track repeatedly, repeatedly totally revolve the hammer deformation processing by the step of above-mentioned heating+revolve hammer; Control hammer discharging speed is 0.8～1.2 meter/minute, and the passage draft so continues the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm to be machined to the tungsten-copper alloy rod silk material B of diameter phi 6.0 ± 0.2mm 8%.At last; On chain drawbench, be that 300 ℃, mold heated temperature are 400 ℃, are 5% to carry out drawing process as lubricant, drawing speed by 1.2～2.0 meters/minute controls, passage drafts with bar surface-coated aquadag with the tungsten-copper alloy of diameter phi 6.0 ± 0.2mm rod silk material B again by silk material heating-up temperature; Carry out single track, repeatedly drawing processing so repeatedly, continue to be machined to the tungsten-copper alloy rod silk material C of diameter phi 4.0 ± 0.05mm until tungsten-copper alloy rod silk material B diameter phi 6.0 ± 0.2mm.
Embodiment 4
With the tungsten-copper alloy diameter that the copper content of infiltration process preparation is 50%, tungsten is corresponding surplus is that φ 14.5 ± 0.5mm, length are that the round base of 400mm is after the processing of car light; In hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 850 ℃ the resistance furnace; Feed nominal roller and directly be the y-type rolling mill unit of φ 220mm; Through 4 road tandem rollings, time processing is to the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm, and the unit of 4 road tandem rollings is mass motion; Its pass is changed to circle → triangle → six sides → arc triangle → circle, and roller footpath linear velocity is followed successively by: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.Continuation in hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 750 ℃ the resistance furnace; Sending into single head revolves the hammer machine and carries out single track and revolve hammer processing; Carry out single track repeatedly, repeatedly totally revolve the hammer deformation processing by the step of above-mentioned heating+revolve hammer; Control hammer discharging speed is 0.8～1.2 meter/minute, and the passage draft so continues the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm to be machined to the tungsten-copper alloy rod silk material B of diameter phi 6.0 ± 0.2mm 8%.At last; On chain drawbench, be that 300 ℃, mold heated temperature are 450 ℃, are 5% to carry out drawing process as lubricant, drawing speed by 1.2～2.0 meters/minute controls, passage drafts with bar surface-coated aquadag with the tungsten-copper alloy of diameter phi 6.0 ± 0.2mm rod silk material B again by silk material heating-up temperature; Carry out single track, repeatedly drawing processing so repeatedly, continue to be machined to the tungsten-copper alloy rod silk material C of diameter phi 4.0 ± 0.05mm until tungsten-copper alloy rod silk material B diameter phi 6.0 ± 0.2mm.
Embodiment 5
With the tungsten-copper alloy diameter that the copper content of infiltration process preparation is 10%, tungsten is corresponding surplus is that φ 14.5 ± 0.5mm, length are that the round base of 400mm is after the processing of car light; In hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 950 ℃ the resistance furnace; Feed nominal roller and directly be the y-type rolling mill unit of φ 220mm; Through 4 road tandem rollings, time processing is to the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm, and the unit of 4 road tandem rollings is mass motion; Its pass is changed to circle → triangle → six sides → arc triangle → circle, and roller footpath linear velocity is followed successively by: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.Continuation in hydrogen atmosphere, heating-up temperature is that heating was taken out after 20 minutes in 850 ℃ the resistance furnace; Sending into single head revolves the hammer machine and carries out single track and revolve hammer processing; Carry out single track repeatedly, repeatedly totally revolve the hammer deformation processing by the step of above-mentioned heating+revolve hammer; Control hammer discharging speed is 0.8～1.2 meter/minute, and the passage draft so continues the tungsten-copper alloy rod silk material A of diameter phi 10 ± 0.2mm to be machined to the tungsten-copper alloy rod silk material B of diameter phi 6.0 ± 0.2mm 8%.At last; On chain drawbench, be that 450 ℃, mold heated temperature are 550 ℃, are 5% to carry out drawing process as lubricant, drawing speed by 1.2～2.0 meters/minute controls, passage drafts with bar surface-coated aquadag with the tungsten-copper alloy of diameter phi 6.0 ± 0.2mm rod silk material B again by silk material heating-up temperature; Carry out single track, repeatedly drawing processing so repeatedly, continue to be machined to the tungsten-copper alloy rod silk material C of diameter phi 4.0 ± 0.05mm until tungsten-copper alloy rod silk material B diameter phi 6.0 ± 0.2mm.
Its raw material and rolling after metallographic contrast, see Fig. 3 and Fig. 4.
Fig. 3 is that copper mass content 10%, tungsten are the diameter phi 14.5mm tungsten-copper alloy circle base metallographic sketch map of corresponding surplus; Fig. 4 is that copper mass content 10%, tungsten are diameter phi 14.5mm tungsten-copper alloy circle base gained diameter phi 10mm tungsten-copper alloy rod silk material A metallographic sketch map behind 4 tandem rollings of corresponding surplus.
Round base of the present invention also can be produced the tungsten-copper alloy sintering circle base of preparation through compacting, sintering processing for class composite W-Cu powder, can also for class composite W-Cu powder through compacting, sintering, the round base that is crushed to.Use these circle bases can obtain identical technique effect by the method for operating of above embodiment with condition as raw material.
The operation of rolling of the present invention also can adopt y-type rolling mill single track 4 times rolling, also can obtain identical technique effect according to other methods of operating of the foregoing description with condition
The above is merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (9)
1. a method of making tungsten-copper alloy rod silk material is characterized in that tungsten-copper alloy circle base after car light is handled, through the y-type rolling mill unit not jacket even number road tandem rolling or not jacket single track even number be rolled into tungsten-copper alloy rod silk material A.
2. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 1 is characterized in that copper mass content is 10%～50% in the said tungsten-copper alloy circle base, and corresponding surplus is a tungsten; This circle base diameter is φ 14.5 ± 0.5mm; This circle base is the round base that infiltration process is produced, the tungsten-copper alloy sintering circle base of perhaps producing through compacting, sintering processing for class composite W-Cu powder, perhaps for class composite W-Cu powder through compacting, sintering, the round base that is crushed to.
3. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 1; It is characterized in that tungsten-copper alloy circle base after car light is handled, through the y-type rolling mill unit not jacket 4 road tandem rollings or not the jacket single track be rolled into the tungsten-copper alloy rod silk material A that diameter is φ 10 ± 0.2mm for 4 times.
4. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 3; The nominal roller that it is characterized in that said y-type rolling mill unit directly is φ 220mm; 4 rolling passes of its 4 road tandem rolling or single track constitute: circle → triangle → six sides → arc triangle → circle; Heating-up temperature is 900 ± 50 ℃, and heating atmosphere is a hydrogen, temperature retention time 20 minutes.
5. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 4; The unit that it is characterized in that said 4 road tandem rollings is whole transmission, and linear velocity is followed successively by from 4 road rollers footpath, the 1st road to the: 79.2 meters/minute, 97.88 meters/minute, 119.86 meters/minute, 146.88 meters/minute.
6. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 1 is characterized in that said tungsten-copper alloy rod silk material A revolves hammer equipment single track through single head and repeatedly totally revolves hammer out the tungsten-copper alloy rod silk material B for diameter phi 6.0～φ 10mm.
7. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 6; It is characterized in that it is 800 ± 50 ℃ that said single head revolves the heating-up temperature that the hammer single track repeatedly totally revolves hammer; Heating atmosphere is a hydrogen; The heat tracing time is 20 minutes, and the hammer discharging speed is 0.8～1.2 meter/minute, and the average draft of passage is 8%.
8. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 6 is characterized in that said tungsten-copper alloy rod silk material B repeatedly adds up drawing through chain type wire drawing single track and becomes the tungsten-copper alloy rod silk material C that diameter is φ 3.0～φ 5.5mm.
9. a kind of method of making tungsten-copper alloy rod silk material as claimed in claim 8; It is characterized in that the silk material heating-up temperature that said chain type wire drawing single track repeatedly adds up drawing is 300-450 ℃; The mold heated temperature is 400-600 ℃; Adopt bar surface-coated aquadag as drawing compound, the drawing speed scope is 1.2～2.0 meters/minute, and the average draft of passage is 5%.
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| CN106269965A (en) * | 2015-05-29 | 2017-01-04 | 北京有色金属研究总院 | A kind of preparation method of molybdenum-copper silk material |
| CN109440024A (en) * | 2018-12-21 | 2019-03-08 | 攀枝花学院 | Tungsten fiber/copper-based composite plate preparation method |
| CN109675956A (en) * | 2018-12-28 | 2019-04-26 | 宁夏东方钽业股份有限公司 | A kind of preparation method of small dimension Niobium Superconducting stick |
| CN110000387A (en) * | 2019-05-20 | 2019-07-12 | 安泰天龙钨钼科技有限公司 | A kind of big specification fine grain tungsten bar and its two rolling preparation methods |
| CN112687787A (en) * | 2020-12-29 | 2021-04-20 | 南昌航空大学 | Manufacturing method of polycrystal series LED copper alloy bonding wire |
| CN113263177A (en) * | 2021-04-15 | 2021-08-17 | 成都虹波实业股份有限公司 | Preparation method for improving large and small heads of tungsten alloy bars |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106269965A (en) * | 2015-05-29 | 2017-01-04 | 北京有色金属研究总院 | A kind of preparation method of molybdenum-copper silk material |
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| CN109440024A (en) * | 2018-12-21 | 2019-03-08 | 攀枝花学院 | Tungsten fiber/copper-based composite plate preparation method |
| CN109675956A (en) * | 2018-12-28 | 2019-04-26 | 宁夏东方钽业股份有限公司 | A kind of preparation method of small dimension Niobium Superconducting stick |
| CN110000387A (en) * | 2019-05-20 | 2019-07-12 | 安泰天龙钨钼科技有限公司 | A kind of big specification fine grain tungsten bar and its two rolling preparation methods |
| CN110000387B (en) * | 2019-05-20 | 2021-06-01 | 安泰天龙钨钼科技有限公司 | Large-size fine-grain tungsten rod and two-roller rolling preparation method thereof |
| CN112687787A (en) * | 2020-12-29 | 2021-04-20 | 南昌航空大学 | Manufacturing method of polycrystal series LED copper alloy bonding wire |
| CN112687787B (en) * | 2020-12-29 | 2022-08-16 | 南昌航空大学 | Manufacturing method of polycrystal series LED copper alloy bonding wire |
| CN113263177A (en) * | 2021-04-15 | 2021-08-17 | 成都虹波实业股份有限公司 | Preparation method for improving large and small heads of tungsten alloy bars |
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