CN-122012961-A - High-strength high-conductivity beryllium copper wire and preparation method thereof

Abstract

The invention discloses a high-strength high-conductivity beryllium copper wire and a preparation method thereof, and belongs to the technical field of electronic materials. The preparation method comprises the steps of weighing and drying beryllium copper master alloy, oxygen-free copper and electrolytic nickel respectively, sequentially carrying out vacuum smelting and refining in a stirring process on the dried beryllium copper master alloy, oxygen-free copper and electrolytic nickel to obtain alloy liquid, carrying out multistage filtration on the alloy liquid, casting the alloy liquid into a crystallizer, sequentially carrying out semicontinuous casting, extrusion, hot rolling, annealing, repeated stretching, first solution treatment, multimode stretching and second solution treatment, and sequentially carrying out finished product pre-stretching, third solution treatment, finished product stretching and ageing treatment on the beryllium copper wire blank subjected to the second solution treatment. The invention ensures the surface quality, strength and conductivity of beryllium copper wires, and has no acid washing process and short process flow.

Inventors

• WU SHAOPENG
• MA XIAO
• ZHANG JIANCAI
• WANG DONGXIN
• LI HAILONG
• CUI SHUHUI
• LI JUNYI
• ZHANG HAO
• ZHANG BAOHUA
• WANG YANTING

Assignees

• 宁夏中色新材料有限公司

Dates

Publication Date

20260512

Application Date

20260131

Claims (10)

1. 1. The preparation method of the high-strength high-conductivity beryllium copper wire is characterized by comprising the following steps of: step S1, weighing beryllium copper master alloy, oxygen-free copper and electrolytic nickel according to the beryllium copper alloy, and respectively drying; s2, placing the dried beryllium copper master alloy, oxygen-free copper and electrolytic nickel into a vacuum induction smelting furnace to sequentially perform vacuum smelting and refining in the stirring process to obtain alloy liquid; S3, adopting a multi-stage silicon nitride ceramic filter plate, carrying out multi-stage filtration on the alloy liquid, casting into a crystallizer, and then carrying out semi-continuous casting and extrusion in sequence to obtain a beryllium copper alloy bar blank; Step S4, heat preservation is carried out on the beryllium copper alloy rod blank at 790-830 ℃ for 70-100 min, and then hot rolling, annealing and repeated stretching are sequentially carried out, so that a beryllium copper wire blank is obtained; S5, passing the beryllium copper wire blank through a bright continuous quenching furnace, and carrying out first solid solution treatment under the protection of nitrogen; S6, carrying out multimode stretching on the beryllium copper wire blank subjected to the first solid solution treatment, and then carrying out the second solid solution treatment under the protection of nitrogen through a bright continuous quenching furnace; s7, stretching the beryllium copper wire blank subjected to the second solid solution treatment before finished products, and performing third solid solution treatment under the protection of nitrogen through a bright continuous quenching furnace; And S8, stretching the finished product of the beryllium copper wire blank subjected to the third solid solution treatment, and performing aging treatment under the protection of nitrogen by a bright continuous quenching furnace to obtain the beryllium copper alloy wire.
2. 2. The method of claim 1, wherein in step S1, the beryllium copper alloy is C17510 beryllium copper alloy; in the step S1, the beryllium content in the beryllium copper master alloy is 3.5-3.9%; in the step S1, the drying temperature is 320-370 ℃ and the drying time is 2-6 h.
3. 3. The method according to claim 2, wherein in the step S2, the vacuum degree of the vacuum melting is 4-10 pa, the temperature is 1450-1500 ℃, and the time is 100-150 min; in the step S2, the vacuum degree of the refining is 3-6 Pa, the temperature is 1450-1500 ℃ and the time is 15-30 min; The stirring frequency is 40-60 Hz.
4. 4. The method according to any one of claims 1 to 3, wherein in the step S3, the first stage is 10 to 20ppi and the second stage is 30 to 50ppi in the multistage filtration; In the step S3, the process of pressing includes: and (3) preserving heat for 5-8 hours at 800-840 ℃ for the beryllium copper alloy ingot obtained after semi-continuous casting, and extruding at an extrusion speed of 18-22 mm/s according to an extrusion ratio of 10-20 to obtain a beryllium copper alloy bar blank.
5. 5. The method according to claim 4, wherein in the step S4, the total working rate of the hot rolling is 90-96%, the pass working rate is 9-22%, and the speed is 40-50 m/min; in the step S4, the annealing temperature is 900-930 ℃ and the annealing time is 40-60 min; In the step S4, the rotating speed of the repeated stretching is 600-800 revolutions per minute, the total processing rate is 91-95%, and the pass processing rate is 17-36%.
6. 6. The method according to claim 5, wherein in the step S5, the temperature of the first solution treatment is 900 to 930 ℃ and the operation speed is 5 to 20m/min.
7. 7. The method according to claim 6, wherein in the step S6, the multi-mode stretching is performed at a stretching rate of 40 to 60m/min, a pass processing rate of 9 to 15%, and a total processing rate of 92 to 95%; In the step S6, the temperature of the second solid solution treatment is 900-930 ℃, and the running speed is 10-25 m/min.
8. 8. The method according to claim 7, wherein in the step S7, the stretching rate of the pre-stretching of the finished product is 40-60 m/min, the pass processing rate is 11-15%, and the total processing rate is 85-94%; In the step S7, the temperature of the third solution treatment is 900-930 ℃, and the running speed is 10-25 m/min.
9. 9. The method according to claim 8, wherein in the step S8, the stretching rate of the finished product is 40-60 m/min, the pass processing rate is 11-15%, and the total processing rate is 70-85%; in the step S8, the temperature of the aging treatment is 550-670 ℃, and the running speed is 2-6 m/min.
10. 10. A high strength high conductivity beryllium copper wire, characterized in that the high strength high conductivity beryllium copper wire is prepared by the preparation method of any one of claims 1 to 9.

Description

High-strength high-conductivity beryllium copper wire and preparation method thereof Technical Field The invention belongs to the technical field of electronic materials, and particularly relates to a high-strength high-conductivity beryllium copper wire and a preparation method thereof. Background The electronic connector and the connector are the nerve junction and the blood circulation system of the modern electronic industry, and are characterized in that energy and signal transmission inside and outside the equipment are realized through a separable interface, which is the basis for realizing modularized manufacturing and convenient maintenance of the equipment, and the electronic connector and the connector are applied to the key fields of consumer electronics, automobiles, communication, industry, medical treatment, aerospace and the like, wherein miniaturization and high speed are pursued in smart phones and data centers, high-temperature and high-voltage high-current are required to be resisted in new energy automobiles, reliability, precision and durability are emphasized in industrial and medical environments, and the ultrahigh standard under extreme working conditions must be met in aerospace. The beryllium copper alloy successfully breaks the traditional effect of eliminating the strength and the conductivity in the materialization through the unique age hardening treatment, so that the beryllium copper alloy becomes an ideal choice for manufacturing the precise elastic contact and the connector element, can bear the mechanical stress of repeated plugging and unplugging, ensures stable contact, can efficiently transmit current and signals, and has excellent stress relaxation resistance so as to ensure long-term reliability. The existing beryllium copper alloy wire preparation process has the defects of long production flow, low efficiency and high cost, the electric conductivity of the beryllium copper alloy wire is 34% IACS, the tensile strength is 570MPa, and the application requirements of high strength and high conductivity are not met. For the low-beryllium copper alloy wire, the heat treatment temperature is high, the surface oxide skin is thick, the surface oxide skin is not easy to remove in the pickling process, and phenomena such as skinning, pit, slag drop and the like easily occur on the surfaces of the beryllium copper wire, the wire and the wire in the later stretching process, so that the product performance and the yield are affected. Meanwhile, in order to remove the surface oxide film generated in the heat treatment process, the surfaces of beryllium copper wires and wires are generally treated by adopting various types of acid washing or chemical polishing solutions, and the use of acid and chemical reagents is not friendly to the environment and is easy to cause safety accidents. Disclosure of Invention The invention aims at providing a preparation method of a high-strength high-conductivity beryllium copper wire, which has the advantages of no pickling process, short process flow, environmental friendliness, low safety accidents and great economic and social values for high-reliability electronic connectors and connectors while ensuring the surface quality, strength and conductivity of the beryllium copper wire. The second purpose of the invention is to provide a high-strength high-conductivity beryllium copper wire. In order to achieve one of the above purposes, the present invention is implemented by the following technical scheme: the preparation method of the high-strength high-conductivity beryllium copper wire comprises the following steps: step S1, weighing beryllium copper master alloy, oxygen-free copper and electrolytic nickel according to the beryllium copper alloy, and respectively drying; s2, placing the dried beryllium copper master alloy, oxygen-free copper and electrolytic nickel into a vacuum induction smelting furnace to sequentially perform vacuum smelting and refining in the stirring process to obtain alloy liquid; s3, adopting a multi-stage silicon nitride ceramic filter plate, carrying out multi-stage filtration on the alloy liquid, casting the alloy liquid into a crystallizer, and sequentially carrying out semi-continuous casting and extrusion to obtain a beryllium copper alloy bar blank; Step S4, heat preservation is carried out on the beryllium copper alloy rod blank at 790-830 ℃ for 70-100 min, and then hot rolling, annealing and repeated stretching are sequentially carried out, so that a beryllium copper wire blank is obtained; S5, passing the beryllium copper wire blank through a bright continuous quenching furnace, and carrying out first solid solution treatment under the protection of nitrogen; S6, carrying out multimode stretching on the beryllium copper wire blank subjected to the first solid solution treatment, and then carrying out the second solid solution treatment under the protection of nitrogen through a bright continuous quenching fur