CN-121992237-A - Sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement

Abstract

The invention discloses a sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement, and relates to the technical field of alloy preparation. The method comprises the following steps of S1 ball-milling copper powder and silver powder, then performing spark plasma sintering, cooling to room temperature to obtain a sintered sample, S2 sequentially performing gradient grinding, polishing and cleaning on the sintered sample, drying, annealing, cooling to room temperature along with a furnace to obtain an annealed sample, S3 performing multi-pass small deformation cold rolling on the annealed sample, wherein each time of deformation is 10% -15%, the total deformation is 70%, and annealing again to obtain the copper-silver alloy with enhanced force-electricity cooperation. The invention realizes microstructure uniformity improvement, grain refinement, copper-silver alloy conductivity-hardness cooperative reinforcement and material current-carrying friction wear property reinforcement, and effectively solves the problems of force-electrical property antagonism, poor structure uniformity, insufficient working condition suitability and the like in the prior art.

Inventors

• LI PU
• ZHANG QIANG
• PU WEI
• DENG CHAOWEN
• LIU YANMIN
• HUANG YANYAN
• ZHOU QINGHUA
• LUO XIAOWU
• YANG LIN
• XU PENGHUI
• ZHANG RUI

Assignees

• 四川大学
• 成都大学
• 北京控制工程研究所

Dates

Publication Date

20260508

Application Date

20260203

Claims (8)

1. 1. The preparation method of the copper-silver alloy force-electricity cooperative reinforcement sintering coupling rolling is characterized by comprising the following steps of: S1, ball milling copper powder and silver powder, then performing spark plasma sintering, and cooling to room temperature to obtain a sintered sample; When in spark plasma sintering, the mixed powder after the balling is filled into a graphite mould, pre-pressed at 20MPa ℃ to 8 min, then heated to 700 ℃ at the speed of 40 ℃ to 60 ℃ per minute under the vacuum condition of 20 ℃ to 40 MPa, then heated to 800 ℃ at the speed of 20 ℃ to 30 ℃ per minute, and heat-preserved at 6 ℃ to 10 min; s2, sequentially carrying out gradient grinding, polishing and cleaning on the sintered sample, drying, and then carrying out annealing treatment, and cooling to room temperature along with a furnace to obtain an annealed sample; s3, carrying out multi-pass small deformation cold rolling on the annealed sample, wherein each deformation is 10% -15%, the total deformation is 70%, and annealing again to obtain the copper-silver alloy with the force-electricity cooperative reinforcement.
2. 2. The method for preparing copper-silver alloy force-electricity cooperative reinforcement sintered coupling rolling according to claim 1, wherein in the step S1, the copper powder is electrolytic dendritic copper powder, the purity is 99.99%, the particle size is less than or equal to 50 μm, the silver powder is spherical copper powder, the purity is 99.99%, the particle size is 1-3 μm, and the silver powder content is 5-15 wt%.
3. 3. The method for preparing the copper-silver alloy force-electricity cooperative reinforcement sintered coupling rolling according to claim 1, wherein in the step S1, the ball-material ratio is 10:1, the rotating speed is 150-250 rpm, 15 is paused for each 30: 30min, min is paused, and the ball milling is 2-4: 4 h.
4. 4. The method for preparing copper-silver alloy force-electricity cooperative reinforcement sintered coupling rolling according to claim 1, wherein in step S1, during spark plasma sintering, the mixed powder after spheroidal graphite is filled into a graphite mold, pre-pressed at 20 MPa for 6 min, then heated to 700 ℃ at a rate of 50 ℃ per minute under a vacuum condition of 20-40 MPa, heated to 800 ℃ at a rate of 25 ℃ per minute, and heat-preserved for 8 min.
5. 5. The preparation method of the copper-silver alloy force-electricity cooperative reinforcement sintering coupling rolling according to claim 1, wherein in the step S2, silicon carbide sand paper with 180-2000 meshes is adopted for gradient polishing, and the copper-silver alloy force-electricity cooperative reinforcement sintering coupling rolling is placed in ethanol solution for ultrasonic cleaning.
6. 6. The method for preparing the copper-silver alloy force-electricity cooperative reinforcement sintered coupling rolling according to claim 1, wherein in the step S2, the temperature is raised to 500 ℃ at a rate of 5-15 ℃ per minute, and the constant temperature is kept at 1 h.
7. 7. The method for preparing the copper-silver alloy force-electricity cooperative reinforcement sintered coupling rolling according to claim 1, wherein in the step S3, 1h is annealed at 350-450 ℃.
8. 8. A force-electricity synergistically enhanced copper-silver alloy, characterized in that it is obtainable by the process according to any one of claims 1-7.

Description

Sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement Technical Field The invention relates to the technical field of alloy preparation, in particular to a sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement. Background Copper-silver (Cu-Ag) alloy is a core candidate material of a conductive slip ring of a spacecraft because of the excellent conductivity of copper and the strengthening property of silver, and is widely applied to the key parts of energy and signal transmission of the spacecraft. The conductive slip ring is used as a core component of the spacecraft, the running reliability of the conductive slip ring directly determines the overall service performance and task success/failure of the spacecraft, and the conductive slip ring needs to bear the extreme working conditions of vacuum, temperature fluctuation, high current and load coupling for a long time, and particularly, the conductive slip ring faces multiple failure risks such as accumulation of joule heat and frictional heat, crack initiation and expansion caused by thermal stress, aggravation abrasion due to abrasive dust accumulation, arc damage and the like in the dynamic contact process of the electric brush and the contact material. However, the existing Cu-Ag alloy still has core performance bottlenecks under the extreme working conditions that the mechanical strength and the conductivity are obviously and negatively correlated, the strength is improved along with the reduction of the conductivity, the surface hardness and the wear resistance are insufficient, the surface layer peeling and the wear failure are easy to occur, and the tribological performance and the service stability under the vacuum current-carrying working condition are difficult to meet the requirements of a new generation of spacecraft on the high-reliability and long-service-life conductive slip ring. In order to optimize the comprehensive performance of the Cu-Ag alloy, scholars at home and abroad have developed various preparation and modification process researches, but have obvious limitations. The casting and vacuum smelting process can realize homogenization of alloy components, but coarse grain and segregation structures are easy to form, so that the mechanical property and conductivity are poor, the subsequent processing difficulty is high, the single plastic deformation process (such as cold rolling and equal channel angular extrusion) can strengthen and improve the strength through dislocation, but internal stress is easy to introduce, stress relaxation is easy to occur under long-term service, the negative influence on conductivity is difficult to control, the traditional powder metallurgy sintering process is high in preparation efficiency, but a sintered body is easy to have pore defects, the interface bonding strength is insufficient, and compactness and performance synergy cannot be considered. Although coating technologies such as Physical Vapor Deposition (PVD), chemical Vapor Deposition (CVD) and the like can improve the surface wear resistance, the coating has weak bonding force with a substrate and low deposition rate, and is difficult to adapt to the large-area uniform strengthening requirement of a conductive slip ring complex-morphology component. Even if the existing research adopts a powder metallurgy and plastic deformation composite process, two main core problems exist, namely, coarse tissues and segregation are easy to form in the sintering process, so that the mechanical properties of a coating and a matrix are not matched, and the research on a friction and wear mechanism under a vacuum current-carrying coupling working condition is insufficient, so that the actual service adaptability of the modified alloy is difficult to verify. Disclosure of Invention The invention aims to provide a sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement, which realizes microstructure uniformity improvement, grain refinement, copper-silver alloy conductivity-hardness cooperative reinforcement and material current-carrying friction wear performance reinforcement and effectively solves the problems of force-electricity antagonism, poor structure uniformity, insufficient working condition suitability and the like in the prior art. The technical scheme for solving the technical problems is as follows, and the invention provides a sintering coupling rolling preparation method for copper-silver alloy force-electricity cooperative reinforcement, which comprises the following steps: S1, ball milling copper powder and silver powder, then performing spark plasma sintering, and cooling to room temperature to obtain a sintered sample; When in spark plasma sintering, the mixed powder after the balling is filled into a graphite mould, pre-pressed at 20MPa ℃ to 8 min, then heated to 700