CN111118304A - Preparation method of high-purity nickel strip foil for electronic industry - Google Patents
Preparation method of high-purity nickel strip foil for electronic industry Download PDFInfo
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- CN111118304A CN111118304A CN202010011176.2A CN202010011176A CN111118304A CN 111118304 A CN111118304 A CN 111118304A CN 202010011176 A CN202010011176 A CN 202010011176A CN 111118304 A CN111118304 A CN 111118304A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 448
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 218
- 239000011888 foil Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 50
- 230000007547 defect Effects 0.000 claims abstract description 45
- 238000003723 Smelting Methods 0.000 claims abstract description 44
- 230000006698 induction Effects 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims description 37
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- 238000000137 annealing Methods 0.000 claims description 36
- 239000002893 slag Substances 0.000 claims description 29
- 238000005097 cold rolling Methods 0.000 claims description 25
- 238000002844 melting Methods 0.000 claims description 25
- 230000008018 melting Effects 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 20
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 238000007670 refining Methods 0.000 claims description 13
- 238000007711 solidification Methods 0.000 claims description 13
- 230000008023 solidification Effects 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical group [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 239000011573 trace mineral Substances 0.000 claims description 8
- 235000013619 trace mineral Nutrition 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 2
- 238000005422 blasting Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 17
- 238000000227 grinding Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 10
- 239000012535 impurity Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000005488 sandblasting Methods 0.000 description 6
- 238000005482 strain hardening Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000010485 coping Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052745 lead Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000009614 chemical analysis method Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001230 potassium iodate Substances 0.000 description 2
- 229940093930 potassium iodate Drugs 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/06—Refining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention provides a preparation method of a high-purity nickel strap foil for the electronic industry, which comprises the steps of smelting an electrolytic nickel plate by adopting a vacuum induction smelting and protective atmosphere electroslag remelting duplex smelting method, detecting internal defects by two times of ultrasonic detection, and removing parts with abnormal detection signals to obtain the high-purity nickel strap foil. The high-purity nickel strap foil prepared by the method has good surface quality and internal metallurgical quality, less inclusion content and less batch performance fluctuation, obviously improves the metallurgical quality level of the pure nickel strap foil and the performance stability between batches, and also obviously reduces the content of harmful elements in the metal nickel strap, wherein the total content is less than 0.01 percent.
Description
Technical Field
The invention relates to the technical field of preparation of high-performance metal nickel strap foils in the electronic industry, in particular to a preparation method of a high-purity nickel strap foil used in the electronic industry. The invention provides a preparation method of a high-purity nickel strap foil for the electronic industry, aiming at the problems of batch quality fluctuation, plate shape defects and the like of domestic pure nickel strap foils.
Background
The pure nickel strap foil has high strength, good heat transfer conductivity, processing ductility and corrosion resistance, and is widely applied to the fields of electronic industry and the like. In recent years, the application fields of pure metal nickel strips and foils are expanding, and the demand is increasing. Due to a certain gap between the technical level and abroad, the import quantity of pure metal nickel strap foils applied to high-end fields of domestic aviation, aerospace, electronics and the like is large. Therefore, the quality level of the pure nickel strap foil in China is improved as soon as possible to replace import, and the method has important economic and social benefits.
In a pure nickel metal material, a trace amount of impurity elements are contained in addition to nickel as a main element. The total impurity content of pure nickel band with the designation N6 regulated in national standard is less than or equal to 0.5%, the total impurity content of N4 nickel band is less than 0.1%, and the requirement of N2 nickel band is higher, the total impurity content is less than 0.02%. Among them, typical harmful impurity elements such as sulfur (S), lead (Pb), etc. easily form a eutectic phase with metal nickel (Ni) with a low melting point, affecting the high temperature performance of the material. In addition, the elements of phosphorus (P) and sulfur also have great chemical affinity with nickel, and eutectic phase NiS is formed during solidification and crystallization2-Ni and Ni3P-Ni, which are distributed in the grain boundary, easily causes crystal cracks in the strip welding process, and reduces the strength of the welding seam. When the content of carbon (C) in the metal exceeds 0.1%, the carbon is easily precipitated in a graphite state in nickel, the intercrystalline bonding force is damaged, cold brittleness is caused, and the mechanical property of the alloy is reduced. Therefore, the purity of the metal nickel and the purity of the smelting process have a significant influence on the quality level of the prepared material.
In recent years, the requirement for the surface quality of nickel foil in the field of electronic industry is higher and higher, and the requirement is strict mainly in two aspects except the requirement for purity: one aspect is surface quality control to meet the final shape and size requirements of the product. The use angle requires that the surface of the foil is flat and has no wavy waving. The surface of the foil material has no bubble, scar, pull crack, scratch, crack, inclusion, scale pressing and the like, and the defects not only can damage the appearance of a finished piece, but also can often reduce the product performance. On the other hand, the internal quality control meeting the product performance requirements is realized, the quality of the internal metallurgical quality of the nickel strip foil has greater influence on the service performance and service life of products and components, and the internal metallurgical defects of the strip comprise holes, looseness, microcracks and the like besides the requirement of uniform grain structures. Therefore, the surface quality control and the internal metallurgical quality improvement of the nickel strap foil play an important role in guaranteeing the performance of the high-quality pure nickel strap foil for the electronic industry.
At present, the main preparation procedures of the metal nickel strip foil are electrolytic nickel vacuum (or non-vacuum) induction melting, casting ingot, ingot forging, hot rolling, cold rolling, annealing, acid washing and the like. However, due to the existence of local solidification shrinkage holes, harmful inclusion elements, wrapped-in nonmetal inclusions and the like in the metal nickel ingot blank, the subsequently prepared pure nickel strip has the problems of high inclusion content, large batch performance fluctuation, difficult control of plate shape quality and the like, and the service performance of the product is influenced. Therefore, the elimination and reduction of metallurgical defects of the metallic nickel ingot blank are the key to ensure the quality level of the subsequently prepared foil.
Disclosure of Invention
The invention aims to provide a preparation method of a high-purity nickel strap foil used in the electronic industry aiming at the defects. Aiming at the requirements of high-quality pure nickel strap foils in the electronic industry, the invention adopts a duplex smelting technology of vacuum induction smelting and protective atmosphere electroslag remelting for smelting, ultrasonic detection is combined to inspect the interior of the materials after smelting, whether defects exist and the size and the position of the defects are evaluated, the abnormal parts of ultrasonic detection signals are cut off from the nickel strap after hot rolling, and the prepared high-purity pure nickel strap foil has good surface quality and internal metallurgical quality, less impurity content and smaller batch performance fluctuation, thereby obviously improving the metallurgical quality and the batch performance stability of the pure nickel strap foil. Meanwhile, the content of harmful elements (such as S, Pb and Sn) in the nickel strip is obviously reduced, the total amount is less than 0.01 percent, and the quality level of the domestic pure nickel strip is improved. The preparation method has the advantages of simple process, low cost, high batch detection efficiency and no pollution to the environment, and is particularly suitable for preparing pure nickel strip products in the electronic industry with high quality requirements.
The technical scheme of the invention is as follows:
the invention provides a preparation method of a high-purity nickel strap foil for the electronic industry, which comprises the steps of smelting an electrolytic nickel plate by adopting a vacuum induction smelting and protective atmosphere electroslag remelting duplex smelting method, detecting internal defects by two times of ultrasonic detection, and removing parts with abnormal detection signals to obtain the high-purity nickel strap foil.
In the process of the protective atmosphere electroslag remelting, a quaternary slag system is adopted as an electroslag remelting slag system, and the quaternary slag system is CaF2、Al2O3CaO and MgO; the CaF2、Al2O3The mass percentages of the CaO and the MgO are as follows: and the balance: 22-25: 18-20: 2 to 5.
The method for vacuum induction melting and protective atmosphere electroslag remelting duplex melting comprises the following steps: after a vacuum induction furnace smelting chamber is vacuumized, an electrolytic nickel plate is smelted by electrifying, high-purity argon is filled after the electrolytic nickel plate is completely melted, trace element carbon and silicon are added for refining, after the refining is finished, a metal nickel melt is poured into a steel ingot mold, and a nickel ingot is obtained after cooling; and carrying out electroslag remelting on the pure nickel electrode ingot under the protective atmosphere of high-purity argon to obtain a nickel ingot blank.
The two ultrasonic detections specifically comprise: firstly, carrying out internal defect detection on a nickel ingot blank obtained by smelting through first ultrasonic detection, and removing large-size solidification porosity and hole parts with abnormal detection signals in the nickel ingot blank through hot rolling, wherein most of the porosity and holes can be closed through the hot rolling process; and carrying out internal defect detection on the nickel plate obtained by hot rolling through secondary ultrasonic detection, and removing a part with abnormal detection signals in the nickel plate through shearing. In the two ultrasonic detections, the first ultrasonic detection is used for detecting the internal defects of the smelted pure nickel ingot, and the second ultrasonic detection is used for detecting the internal defects of the pure nickel plate obtained by hot rolling the pure nickel ingot.
The parameter conditions of the first ultrasonic detection are as follows: the equivalent flat bottom hole diameter is 3.0mm +/-1 mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are all 1.5mm +/-0.5 mm; the parameter conditions of the second ultrasonic detection are as follows: the equivalent flat-bottom hole diameter is 1.5mm + -1 mm, the equivalent flat-bottom hole diameters of the plurality of discontinuity indicator and elongated discontinuity indicator signals are each 1.0mm + -0.5 mm, and the bottom wave reflection loss is less than or equal to 50%.
The heating temperature in the hot rolling process is 980 +/-30 ℃, and the heat preservation time is 2-3 hours.
Before the second ultrasonic detection, the oxide skin on the surface of the pure nickel plate is removed by high-pressure water sand blasting in advance.
And after the second ultrasonic detection, cold rolling and annealing the nickel plate without the internal defect to obtain the high-purity nickel strap foil.
The cold rolling process comprises the following steps: performing multi-pass circulating cold rolling on the nickel plate without the internal defects after the second ultrasonic detection by using a cold rolling unit, wherein the control range of pass reduction is 1-6%; in the annealing process, the annealing temperature is 670 +/-10 ℃, and the annealing time is 5-10 hours.
The protective gas for electroslag remelting in the protective atmosphere is high-purity argon, the mass concentration of the high-purity argon is more than 99.9%, and the oxygen content in the high-purity argon is less than 2 ppm.
A preparation method of a high-purity nickel strap foil for the electronic industry comprises the following specific steps:
(1) vacuum induction melting and protective atmosphere electroslag remelting duplex melting: the vacuum system of a mechanical pump, a Roots pump or a booster pump is adopted to vacuumize the smelting chamber of the vacuum induction smelting furnace, and the working vacuum degree during smelting is required to be lower than 1 multiplied by 10-1Pa, putting the electrolytic nickel plate cut into proper size into a refractory material crucible of a vacuum induction melting furnace, slowly transmitting electricity to heat the electrolytic nickel plate for melting, and filling high-purity argon (more than 99.9 percent wt, O) after the electrolytic nickel plate is completely melted2Less than 2ppm), adding trace element carbon and silicon, refining for 15-20 minutes to make the metal liquid more uniform and pure, and after the refining is finished, adding metallic nickelPouring the melt into an ingot mold, and cooling to obtain a pure nickel ingot; putting the pure nickel electrode ingot in high-purity argon (more than 99.9 percent by weight, O)2Less than 2ppm) under protective atmosphere to obtain pure nickel ingot blank. Aiming at the characteristics of high requirements on the conductivity of pure metallic nickel in the electronic industry, the electroslag remelting slag system is designed into a quaternary slag system, and the slag system comprises the following basic components in percentage by mass: CaF2/Al2O3The balance of/CaO/MgO: 22-25: 18-20: 2 to 5. In addition, the electroslag remelting adopts a copper crystallizer with a rectangular inner cavity, and a pure nickel ingot after electroslag remelting is a rectangular ingot convenient for rolling and cogging;
(2) grinding: carrying out surface grinding on the rectangular pure nickel ingot by machining, and removing electroslag slag crust and the head and tail of the rectangular pure nickel ingot;
(3) first ultrasonic detection: carrying out flaw detection on a nickel ingot blank obtained by smelting by adopting an ultrasonic flaw detector, and detecting internal defects of the nickel ingot, namely large-size solidification porosity and holes in the nickel ingot; the detected process parameter conditions are as follows: the equivalent flat bottom hole diameter is 3.0mm +/-1 mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are all 1.5mm +/-0.5 mm;
(4) hot rolling: putting the nickel ingot into a furnace for heating, discharging the nickel ingot out of the furnace after the central part of the nickel ingot is thoroughly heated, and rolling and cogging the nickel ingot by using a hot rolling mill to prepare a nickel plate with the thickness of 2-5 mm; hot rolling, wherein the heating temperature is 980 +/-30 ℃, and the heat preservation time is 2-3 hours; the defect parts such as abnormal large-size solidification porosity and holes of detection signals in the nickel ingot blank can be removed through hot rolling, and most of the porosity and holes can be closed through the hot rolling process.
(5) Removing oxide skin and coping: removing oxide skin on the surface of the nickel plate by adopting high-pressure water sand blasting, and carrying out necessary grinding on the surface of the pure nickel plate to improve the surface quality so as to meet the requirements of flaw detection and subsequent cold rolling;
(6) and (3) second ultrasonic detection: carrying out contact flaw detection on the nickel plate obtained by grinding and hot rolling by using an ultrasonic flaw detector, and removing a part with abnormal detection signals in the nickel plate by shearing; the detection parameter conditions are as follows: the equivalent flat bottom hole diameter is 1.5mm plus or minus 1mm, the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are all 1.0mm plus or minus 0.5mm, and the bottom wave reflection loss is lower than or equal to 50%;
(7) cold rolling: performing multi-pass circulating cold rolling on the nickel plate without internal metallurgical defects after ultrasonic flaw detection by using a cold rolling unit, wherein the control range of pass reduction is 1-6%;
(8) annealing: with the increase of the deformation, the work hardening of the strip material is more serious, which leads to the increase of the subsequent deformation difficulty, the intermediate procedure adopts a hydrogen-protected continuous bright annealing furnace to carry out stress relief annealing treatment on the nickel plate, so as to eliminate and reduce the work hardening, and the high-purity nickel strap foil material is obtained after annealing; in the annealing process, the annealing temperature is 670 +/-10 ℃, and the annealing time is 5-10 hours.
(9) Finished strip: rolling the high-purity nickel strip foil to a proper size and thickness, cleaning, deoiling, straightening, rolling into a finished product roll and warehousing.
The invention has the beneficial effects that:
(1) the invention adopts the duplex smelting technology of vacuum induction smelting and protective atmosphere electroslag remelting for smelting, detects the interior of a detection material by combining ultrasonic after smelting, evaluates whether defects exist and the size and the position of the defects, removes the abnormal part of a detection signal, and obtains the high-purity nickel strip foil which has good surface quality and internal metallurgical quality, low inclusion content and small batch performance fluctuation, thereby obviously improving the metallurgical quality and the batch performance stability of the pure nickel strip foil, simultaneously, obviously reducing the contents of harmful elements S, Pb and P in the nickel strip, ensuring that the total amount is less than 0.01 percent and being beneficial to improving the quality level of domestic pure nickel strips. The preparation method has the advantages of simple process, low cost, high batch detection efficiency and no pollution to the environment, and is particularly suitable for the production of products in the electronic industry with high requirements on the quality of pure nickel strips.
(2) The invention adopts the double-linkage smelting technology of vacuum induction smelting and protective atmosphere electroslag remelting for smelting, can accurately control metal components, remove gas and impurities, obviously reduce the content of harmful gas in the alloy, simultaneously avoid the oxidation and volatilization of beneficial trace elements, and reduce the defects of looseness, holes and the like in cast ingots. After melting, the internal metallurgical defects are detected by combining ultrasonic detection, and the quality of the plate is controlled from the front end, so that the influence of the metallurgical defects in the plate blank, such as looseness, impurities and the like, on the quality of the foil is avoided, and the cost is effectively reduced.
(3) The invention designs specific electroslag remelting slag system components and determined component proportion aiming at the characteristics of pure metallic nickel used in the electronic industry, the components not only can effectively remove elemental sulfur (S) in the alloy and inhibit burning loss of beneficial elements, but also have lower melting point (about 1260 ℃), moderate resistance, and are beneficial to refining and low-melting-rate remelting of the alloy, and simultaneously realize the advantages of micro-magnesium alloying and the like, and the content of the S element in the prepared pure metallic nickel strip is lower than 5 ppm.
(4) The method adopts high-pressure water sand blasting to remove the oxide skin, does not need to carry out excessive pretreatment on the strip, avoids the pollution of the pickling process to the external environment, and has environment-friendly process.
(5) The invention adopts twice ultrasonic detection methods to detect defects, detects the internal defects of the nickel ingot for the first time, and mainly aims to detect the solidification porosity and holes with larger internal dimension and remove the defects through the hot rolling process according to the detection result, because most of the porosity and holes can be closed through the subsequent hot rolling process; and the second detection of the internal defects of the pure nickel plate is to detect the residual metallurgical defects of small-size holes, looseness, microcracks and the like in the plate and strip materials, and then the metallurgical defects are removed by shearing to ensure the quality of the pure nickel plate. The two-time ultrasonic detection is not only beneficial to detecting the metallurgical defects with different sizes, reduces the production cost, but also ensures the product quality.
Detailed Description
Example 1
A preparation method of a high-purity nickel strap foil for the electronic industry comprises the following specific steps:
(1) vacuum induction melting and protective atmosphere electroslag remelting duplex melting: the vacuum system of a mechanical pump, a roots pump or a booster pump is adopted to vacuumize the smelting chamber of the vacuum induction smelting furnace, and the requirement on the working vacuum degree during smelting is lowPutting the electrolytic nickel plate cut into a proper size into a refractory material crucible of a vacuum induction melting furnace at 0.1Pa, slowly and electrically heating the electrolytic nickel plate to melt at 1530 ℃, and filling high-purity argon (more than 99.9 percent by weight, O and the like) after the electrolytic nickel plate is completely melted2Less than 2ppm), adding trace element carbon and silicon for refining for 18 minutes to ensure that the molten metal is more uniform and pure, pouring the molten metal nickel into an ingot mould after the refining is finished, and cooling to obtain a pure nickel ingot; putting the pure nickel electrode ingot in high-purity argon (more than 99.9 percent by weight, O)2Less than 2ppm) under protective atmosphere to obtain pure nickel ingot blank. The electroslag remelting slag system is designed into a quaternary slag system, and the slag system comprises the following basic components in percentage by mass: CaF2/Al2O354 parts of/CaO/MgO: 23: 20: 3. in addition, the electroslag remelting adopts a copper crystallizer with a rectangular inner cavity, and a pure nickel ingot after electroslag remelting is a rectangular ingot which is convenient to roll and cogging.
(2) Grinding: carrying out surface grinding on the rectangular pure nickel ingot by machining, and removing electroslag slag crust and the head and tail of the rectangular pure nickel ingot;
(3) first ultrasonic detection: carrying out flaw detection on a nickel ingot blank obtained by smelting by adopting an ultrasonic flaw detector, and detecting internal defects of the nickel ingot, namely large-size solidification porosity and holes in the nickel ingot; the detected parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 3.0mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signal are all phi 2.0 mm.
(4) Hot rolling: heating the pure nickel ingot blank in a furnace at 1010 ℃, discharging the pure nickel ingot out of the furnace after the center of the pure nickel ingot is completely heated, and rolling and cogging the pure nickel ingot by using a hot rolling mill to prepare a pure nickel plate with the thickness of 3 mm; hot rolling, wherein the heating temperature is 980 ℃, and the heat preservation time is 3 hours; the defect parts such as abnormal large-size solidification porosity and holes of detection signals in the nickel ingot blank can be removed through hot rolling, and most of the porosity and holes can be closed through the hot rolling process.
(5) Removing oxide skin and coping: removing oxide skin on the surface of the pure nickel plate by adopting high-pressure water sand blasting, and carrying out necessary grinding on the surface of the pure nickel plate to improve the surface quality so as to meet the flaw detection requirement and prepare for the subsequent cold rolling process;
(6) and (3) second ultrasonic detection: carrying out contact flaw detection on the nickel plate obtained by grinding and hot rolling by using an ultrasonic flaw detector, and removing a part with abnormal detection signals in the nickel plate by shearing; the detection parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 2.0mm, the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are phi 1.5mm, and the bottom wave reflection loss is 40%;
(7) cold rolling: performing multi-pass circulating cold rolling on the pure nickel plate without the internal metallurgical defects after ultrasonic flaw detection by adopting a cold rolling unit, wherein the pass reduction is 2%;
(8) annealing: with the increase of the deformation, the work hardening of the strip material is more serious, which leads to the increase of the subsequent deformation difficulty, the intermediate procedure adopts a hydrogen-protected continuous bright annealing furnace to carry out stress relief annealing treatment on the pure nickel plate material, so as to eliminate and relieve the work hardening, and the high-purity nickel strip foil material is obtained after annealing; in the annealing process, the annealing temperature is 670 ℃ and the annealing time is 8 hours.
(9) Finished strip: and cleaning and deoiling the high-purity nickel strip foil, straightening, rolling into a finished product roll and warehousing.
Example 2
A preparation method of a high-purity nickel strap foil for the electronic industry comprises the following specific steps:
(1) vacuum induction melting and protective atmosphere electroslag remelting duplex melting: vacuumizing a smelting chamber of a vacuum induction smelting furnace by adopting a mechanical pump, a Roots pump or a booster pump vacuum system, wherein the working vacuum degree is required to be lower than 0.08Pa during smelting, putting an electrolytic nickel plate cut into a proper size into a refractory material crucible of the vacuum induction smelting furnace, slowly transmitting power to heat the electrolytic nickel plate for smelting, and filling high-purity argon (more than 99.9 percent wt, O and the like) into the crucible after the electrolytic nickel plate is completely molten2Less than 2ppm), adding trace elements such as carbon and the like for refining for 15 minutes to ensure that the molten metal is more uniform and pure, pouring the molten metal of the metallic nickel into an ingot mould after the refining is finished, and cooling to obtain a pure nickel ingot; putting the pure nickel electrode ingot in high-purity argon (more than 99.9 percent by weight, O)2＜2ppm) Carrying out electroslag remelting in a protective atmosphere to obtain a pure nickel ingot blank. The electroslag remelting slag system is designed into a quaternary slag system, and the slag system comprises the following basic components in percentage by mass: CaF2/Al2O357/CaO/MgO: 22: 18: 3. in addition, the electroslag remelting adopts a copper crystallizer with a rectangular inner cavity, and a pure nickel ingot after electroslag remelting is a rectangular ingot which is convenient to roll and cogging.
(2) Grinding: carrying out surface grinding on the rectangular pure nickel ingot by machining, and removing electroslag slag crust and the head and tail of the rectangular pure nickel ingot;
(3) first ultrasonic detection: carrying out flaw detection on a nickel ingot blank obtained by smelting by adopting an ultrasonic flaw detector, and detecting internal defects of the nickel ingot, namely large-size solidification porosity and holes in the nickel ingot; the detected parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 3.5mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signal are phi 2.0 mm.
(4) Hot rolling: heating the pure nickel ingot blank in a furnace, discharging the pure nickel ingot out of the furnace after the center of the pure nickel ingot is completely heated, and rolling and cogging the pure nickel ingot by adopting a hot rolling mill to prepare a pure nickel plate with the thickness of 5 mm; hot rolling at 990 deg.c for 2 hr; the defect parts such as abnormal large-size solidification porosity and holes of detection signals in the nickel ingot blank can be removed through hot rolling, and most of the porosity and holes can be closed through the hot rolling process.
(5) Removing oxide skin and coping: removing oxide skin on the surface of the pure nickel plate by adopting high-pressure water sand blasting, and carrying out necessary grinding on the surface of the pure nickel plate to improve the surface quality so as to meet the flaw detection requirement and prepare for the subsequent cold rolling process;
(6) and (3) second ultrasonic detection: carrying out contact flaw detection on the nickel plate obtained by grinding and hot rolling by using an ultrasonic flaw detector, and removing a part with abnormal detection signals in the nickel plate by shearing; the detection parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 1.5mm, the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are phi 1.0mm, and the bottom wave reflection loss is 30%;
(7) cold rolling: performing multi-pass circulating cold rolling on the pure nickel plate without the internal metallurgical defects after ultrasonic flaw detection by adopting a cold rolling unit, wherein the pass reduction is 3%;
(8) annealing: with the increase of the deformation, the work hardening of the strip material is more serious, which leads to the increase of the subsequent deformation difficulty, the intermediate procedure adopts a hydrogen-protected continuous bright annealing furnace to carry out stress relief annealing treatment on the pure nickel plate material, so as to eliminate and relieve the work hardening, and the high-purity nickel strip foil material is obtained after annealing; in the annealing process, the annealing temperature is 680 ℃, and the annealing time is 9 hours.
(9) Finished strip: and cleaning and deoiling the high-purity nickel strip foil, straightening, rolling into a finished product roll and warehousing.
Example 3
A preparation method of a high-purity nickel strap foil for the electronic industry comprises the following specific steps:
(1) vacuum induction melting and protective atmosphere electroslag remelting duplex melting: vacuumizing a smelting chamber of a vacuum induction smelting furnace by adopting a mechanical pump, a Roots pump or a booster pump vacuum system, wherein the working vacuum degree is required to be lower than 0.08Pa during smelting, putting an electrolytic nickel plate cut into a proper size into a refractory material crucible of the vacuum induction smelting furnace, slowly transmitting power to heat the electrolytic nickel plate for smelting, and filling high-purity argon (more than 99.9 percent wt, O and the like) into the crucible after the electrolytic nickel plate is completely molten2Less than 2ppm), adding trace elements such as carbon and the like for refining for 20 minutes to ensure that the molten metal is more uniform and pure, pouring the molten metal of the metallic nickel into an ingot mould after the refining is finished, and cooling to obtain a pure nickel ingot; putting the pure nickel electrode ingot in high-purity argon (more than 99.9 percent by weight, O)2Less than 2ppm) under protective atmosphere to obtain pure nickel ingot blank. The electroslag remelting slag system is designed into a quaternary slag system, and the slag system comprises the following basic components in percentage by mass: CaF2/Al2O350 parts of/CaO/MgO: 25: 20: 5. in addition, the electroslag remelting adopts a copper crystallizer with a rectangular inner cavity, and a pure nickel ingot after electroslag remelting is a rectangular ingot which is convenient to roll and cogging.
(2) Grinding: carrying out surface grinding on the rectangular pure nickel ingot by machining, and removing electroslag slag crust and the head and tail of the rectangular pure nickel ingot;
(3) first ultrasonic detection: carrying out flaw detection on a nickel ingot blank obtained by smelting by adopting an ultrasonic flaw detector, and detecting internal defects of the nickel ingot, namely large-size solidification porosity and holes in the nickel ingot; the detection parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 4.0mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signal are phi 1.5 mm. Processing to remove metallurgical defects exceeding the size requirement;
(4) hot rolling: putting the nickel ingot blank into a furnace for heating, discharging the nickel ingot blank out of the furnace after the central part of the nickel ingot is thoroughly heated, and rolling and cogging the nickel ingot blank by adopting a hot rolling mill to prepare a pure nickel plate with the thickness of 2 mm; the heating temperature in the hot rolling process is 1010 ℃, and the heat preservation time is 2 hours; the defect parts such as abnormal large-size solidification porosity and holes of detection signals in the nickel ingot blank can be removed through hot rolling, and most of the porosity and holes can be closed through the hot rolling process.
(5) Removing oxide skin and coping: removing oxide skin on the surface of the pure nickel plate by adopting high-pressure water sand blasting, and carrying out necessary grinding on the surface of the pure nickel plate to improve the surface quality so as to meet the flaw detection requirement and prepare for the subsequent cold rolling process;
(6) and (3) second ultrasonic detection: and (3) carrying out contact flaw detection on the nickel plate obtained by grinding and hot rolling by using an ultrasonic flaw detector, and removing the abnormal part of the detection signal in the nickel plate by shearing. The detection parameter conditions are as follows: the equivalent flat bottom hole diameter is phi 0.5mm, the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are phi 0.5mm, and the bottom wave reflection loss is 30%;
(7) cold rolling: performing multi-pass circulating cold rolling on the nickel plate without the internal metallurgical defects after ultrasonic flaw detection by adopting a cold rolling unit, wherein the pass reduction is 6%;
(8) annealing: with the increase of the deformation, the processing hardening of the strip material is more serious, which leads to the increase of the subsequent deformation difficulty, the intermediate procedure adopts a hydrogen-protected continuous bright annealing furnace to carry out stress relief annealing treatment on the nickel plate, the processing hardening is eliminated, and the nickel strap foil material is obtained after annealing; in the annealing process, the annealing temperature is 660 ℃, and the annealing time is 5 hours.
(9) Finished strip: and cleaning and deoiling the nickel strip foil, straightening, rolling into a finished product roll and warehousing.
Test example 1
1. Sample (I)
Comparative sample 1: the electroslag remelting slag system is as follows: CaF2/Al2O3CaO 60: 30: the preparation method and procedure are the same as in example 1.
Comparative sample 2: the electroslag remelting slag system is as follows: CaF2/Al2O354 parts of/CaO/MgO: 40: 5: the preparation method and procedure are the same as in example 1.
Comparative sample 3: the electroslag remelting slag system is as follows: CaF2/Al2O374 for/MgO: 23: the preparation method and procedure are the same as in example 1.
Inventive example 1 sample.
Inventive example 2 sample.
Inventive example 3 sample.
2. The S element content testing method comprises the following steps: GB223.68-89, steel and alloy chemical analysis method combustion-potassium iodate volumetric method determination of sulfur content.
The test results are shown in table 1:
TABLE 1 measurement results of harmful element S
| Categories | S(ppm) |
| Comparative sample 1 | 9 |
| Comparative sample 2 | 14 |
| Comparative sample 3 | 26 |
| Inventive example 1 sample | 4 |
| Inventive example 2 sample | 3 |
| Inventive example 3 sample | 4 |
Therefore, the electroslag remelting slag system is specially designed according to the invention in terms of components and component proportion, the content of harmful element S is increased when the proportion is exceeded or one component is lacked, and the content of S element in the pure nickel strip prepared by the invention is lower than 5 ppm. Compared with the nickel strap prepared by the slag system in the prior art, the pure nickel strap prepared by the electroslag remelting slag system has the advantage that the harmful element S in the pure nickel strap is obviously reduced.
Test example 2
1. Sample (I)
Comparative sample 4: the nickel metal strip foil is prepared by the vacuum induction melting method in the prior art.
Comparative sample 5: a nickel metal tape foil material, which is commercially available from baoti group.
Comparative sample 6: the nickel foil obtained by the vacuum induction melting step only and without the ultrasonic detection step was prepared, and the other steps and conditions were the same as in example 1.
Comparative sample 7: the nickel metal strip foil is prepared only by adopting the vacuum induction melting step and not by adopting the protective atmosphere electroslag remelting step, and other steps and conditions are the same as those of the example 1.
Example 1 sample.
Example 2 samples.
Example 3 samples.
The preparation method of the comparative sample 4 comprises the following steps: the method comprises the steps of preparing a pure nickel ingot by adopting vacuum induction melting in the prior art, and then cogging and forging the nickel ingot, hot rolling and cold rolling the nickel ingot to finally prepare the nickel strap foil.
2. The test method comprises the following steps: GB223.68-89, steel and alloy chemical analysis method combustion-potassium iodate volumetric method determine the sulfur content; GJB8781.17-2015 superalloy trace element analysis method, part 17: the hollow cathode spectrometry is used for measuring the contents of arsenic, silver, tin, antimony, tellurium, thallium, lead and bismuth (a conventional method; a GB/T11261 steel ferrite content measuring pulse heating inert gas melting-infrared absorption method; a GB/T8978-.
The test results of the harmful element detection results are shown in table 2:
table 2 harmful element test results (% wt)
The result shows that the metal nickel strap prepared by the vacuum induction melting and protective atmosphere electroslag remelting duplex melting technology of the invention and the ultrasonic detection technology remarkably improves the metallurgical quality and the stability of performance among batches of the nickel strap foil, obviously reduces the contents of harmful elements S, Pb and P in the metal nickel strap, the total amount is less than 0.01 percent by weight, and simultaneously reduces the content of harmful gases (such as O) in the alloy. The preparation method of the invention has no pollution to the environment, and is particularly suitable for the preparation of products in the electronic industry with high requirements on the quality of pure nickel strips.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed.
Claims (10)
1. A preparation method of a high-purity nickel strap foil for the electronic industry is characterized in that an electrolytic nickel plate is firstly smelted by adopting a vacuum induction smelting and protective atmosphere electroslag remelting duplex smelting method, then internal defect detection is carried out by two times of ultrasonic detection, and the part with abnormal detection signals is removed, so that the high-purity nickel strap foil is obtained.
2. The method for preparing high-purity nickel strap foil for electronic industry as claimed in claim 1, wherein in the protective atmosphere electroslag remelting process, an electroslag remelting slag system adopts a quaternary slag system, and the quaternary slag system is CaF2、Al2O3CaO and MgO; the CaF2、Al2O3The mass percentages of the CaO and the MgO are as follows: and the balance: 22-25: 18-20: 2 to 5.
3. The method for preparing the high-purity nickel strip foil for the electronic industry as claimed in claim 1, wherein the method for vacuum induction melting and protective atmosphere electroslag remelting duplex melting comprises the following steps: after a vacuum induction furnace smelting chamber is vacuumized, an electrolytic nickel plate is smelted by electrifying, high-purity argon is filled after the electrolytic nickel plate is completely melted, trace element carbon and silicon are added for refining, after the refining is finished, a metal nickel melt is poured into a steel ingot mold, and a nickel ingot is obtained after cooling; and carrying out electroslag remelting on the pure nickel electrode ingot under the protective atmosphere of high-purity argon to obtain a nickel ingot blank.
4. The method for preparing the high-purity nickel strap foil for the electronic industry as claimed in claim 1, wherein the two ultrasonic detections specifically comprise: firstly, carrying out internal defect detection on a nickel ingot blank obtained by smelting through first ultrasonic detection, removing large-size solidification porosity and hole parts with abnormal detection signals in the nickel ingot blank through hot rolling, carrying out internal defect detection on a nickel plate obtained through hot rolling through second ultrasonic detection, and removing the parts with abnormal detection signals in the nickel plate through shearing.
5. The method for preparing the high-purity nickel strap foil for the electronic industry as claimed in claim 4, wherein the parameter conditions of the first ultrasonic detection are as follows: the equivalent flat bottom hole diameter is 3.0mm +/-1 mm, and the equivalent flat bottom hole diameters of the plurality of discontinuity indication signals and the elongated discontinuity indication signals are all 1.5mm +/-0.5 mm; the parameter conditions of the second ultrasonic detection are as follows: the equivalent flat-bottom hole diameter is 1.5mm + -1 mm, the equivalent flat-bottom hole diameters of the plurality of discontinuity indicator and elongated discontinuity indicator signals are each 1.0mm + -0.5 mm, and the bottom wave reflection loss is less than or equal to 50%.
6. The method for preparing the high-purity nickel strap foil for the electronic industry as claimed in claim 4, wherein the heating temperature in the hot rolling process is 980 ± 30 ℃ and the holding time is 2-3 hours.
7. The method for preparing a high purity nickel strip foil for use in the electronics industry as claimed in claim 4, wherein the scale on the surface of the pure nickel plate is removed by high pressure water blasting in advance before the second ultrasonic inspection.
8. The method for preparing high-purity nickel strap foil for the electronic industry as claimed in claim 4, wherein after the second ultrasonic inspection, the nickel plate without internal defects is cold-rolled and annealed to obtain the high-purity nickel strap foil.
9. The method for preparing the high-purity nickel strap foil for the electronic industry as claimed in claim 4, wherein the cold rolling process comprises the following steps: performing multi-pass circulating cold rolling on the pure nickel plate without the internal defects after the second ultrasonic detection by using a cold rolling unit, wherein the pass reduction control range is 1-6%; in the annealing process, the annealing temperature is 670 +/-10 ℃, and the annealing time is 5-10 hours.
10. The method for preparing the high-purity nickel strap foil for the electronic industry as claimed in claim 1, wherein the protective gas of the protective atmosphere electroslag remelting is high-purity argon, the mass concentration of the high-purity argon is more than 99.9%, and the oxygen content in the high-purity argon is less than 2 ppm.
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