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CN-121992244-A - Gold-based alloy electric contact piece and preparation method thereof

CN121992244ACN 121992244 ACN121992244 ACN 121992244ACN-121992244-A

Abstract

The invention discloses a gold-based alloy electric contact piece and a preparation method thereof, belonging to the technical field of noble metal alloy materials. The gold-based alloy electrical contact sheet comprises, by mass, 25% -30% of palladium, 15% -20% of silver, 1% -5% of tin and the balance of gold. According to the invention, through the synergistic optimization of the gold-based alloy composition components and the preparation method, the mechanical properties of the gold-based alloy electric contact sheet are balanced better, and meanwhile, the conductivity and the wear resistance of the gold-based alloy electric contact sheet are effectively improved, so that the overall comprehensive performance of the gold-based alloy electric contact sheet reaches a better level, and the use requirement of severe working conditions is met.

Inventors

  • WU HAIJUN
  • LU SHAOPING
  • ZHANG WENLIN
  • ZHAO YUNQIANG
  • WENG JIE
  • ZHAO QI
  • HONG YU
  • CHEN DENGQUAN
  • XU HONG
  • WEI YIWEI
  • LIU ZIJIE
  • FANG XIAOXIANG

Assignees

  • 昆明贵研新材料科技有限公司
  • 昆明贵金属研究所
  • 云南贵金属实验室有限公司

Dates

Publication Date
20260508
Application Date
20260203

Claims (10)

  1. 1. The gold-based alloy electrical contact sheet is characterized by comprising, by mass, 25% -30% of palladium, 15% -20% of silver, 1% -5% of tin and the balance of gold.
  2. 2. The method for preparing the gold-based alloy electrical contact sheet of claim 1, wherein the method comprises the following steps: (1) In an inert gas protection environment, mixing and smelting palladium, silver, tin and gold raw materials, and then casting to obtain an ingot; (2) Performing solution treatment on the cast ingot in the step (1); (3) Carrying out multi-pass cold forging on the ingot casting subjected to the solution treatment in the step (2) to obtain a plate; (4) Carrying out multi-pass hot rolling on the plate in the step (3) in an inert atmosphere protection environment to obtain a hot rolled blank, and carrying out heat preservation on a hot rolled piece after each-pass hot rolling; (5) Annealing the hot rolled blank in the step (4) in an inert atmosphere protection environment to obtain an annealed blank; (6) Sequentially carrying out multi-pass cold rolling and aging treatment on the annealed blank in the step (5) to obtain a sheet, wherein in the multi-pass cold rolling process, each time of rolling is carried out for 5-8 times, then low-temperature tempering is carried out, and the aging treatment is carried out in an inert atmosphere protection environment; (7) And (3) carrying out surface treatment on the sheet material in the step (6) to obtain the gold-based alloy electric contact sheet.
  3. 3. The method of claim 2, wherein in the step (1), the melting temperature is 1300-1400 ℃ and the melting time is 10-15min.
  4. 4. The method of claim 2, wherein in the step (2), the solid solution temperature is 1140-1160 ℃, the heat preservation time is 3.5-4 hours, and the cooling rate is more than or equal to 200 ℃ per second.
  5. 5. The method according to claim 2, wherein in the step (3), the single deformation amount of cold forging is not more than 5%, and the cumulative deformation amount of cold forging is 50-75%.
  6. 6. The method according to claim 2, wherein in the step (4), the sheet is heated to 700-750deg.C, kept at the temperature for 40-60min, and then subjected to hot rolling at the temperature of 700-750deg.C for 5-10min after each hot rolling, wherein the single-pass deformation amount of the multi-pass hot rolling is less than or equal to 5%, and the total deformation amount of the multi-pass hot rolling is 40-60%.
  7. 7. The method of claim 2, wherein in the step (5), the annealing temperature is 900-1000 ℃, the heat preservation time is 15-20min, the water quenching is performed after the heat preservation, and the cooling rate is more than or equal to 200 ℃ per second.
  8. 8. The method of claim 2, wherein in the step (6), the single-pass deformation amount of the multi-pass cold rolling is 3-5%, the cumulative deformation amount is 50-75%, the low-temperature tempering temperature is 150-200 ℃, and the tempering time is 10-20min.
  9. 9. The preparation method of the steel sheet as claimed in claim 2, wherein in the step (6), the aging treatment temperature is 600-800 ℃, the heat preservation time is 50-60min, the water quenching is carried out after the heat preservation, and the water quenching cooling rate is more than or equal to 200 ℃ per second.
  10. 10. The method of claim 2, wherein in the step (7), the surface treatment is performed by using saturated saline or saturated hydrochloric acid as an electrolytic polishing solution, performing electrolytic polishing on the sheet at a temperature of 15-25deg.C, controlling the current density to 3-5A/dm 2 according to the area of the sheet, and sequentially performing ultrasonic cleaning and vacuum drying.

Description

Gold-based alloy electric contact piece and preparation method thereof Technical Field The invention belongs to the technical field of noble metal alloy materials, and relates to a gold-based alloy electric contact sheet and a preparation method thereof. Background With the rapid development of the fields of high-speed railways, aerospace, precise instruments and the like, higher requirements are put forward on the performance of electric contact materials working under severe working conditions such as high temperature, high speed, high load and the like. Such materials are required to have excellent wear resistance and low resistivity, as well as good tensile strength and mechanical properties such as plasticity. Noble metal alloy systems, in particular gold-based alloys, are of irreplaceable importance in the field of high-precision, high-reliability electrical contacts. However, conventional gold-based wear-resistant materials (such as Au-Ag-Cu, au-Ni, etc. systems) mainly rely on solid solution strengthening or the introduction of a coarse second phase to increase hardness, thereby improving wear resistance, and under high temperature or high load conditions, the wear resistance is easily reduced sharply due to coarsening of the precipitated phase or interfacial exfoliation. In the prior art, an attempt is made to delay the softening of a material by adding a high-melting-point metal (such as W, mo), but the alloy is often poor in cold processing performance and obviously increased in resistivity, and comprehensive optimization of mechanical properties, wear resistance and conductivity is difficult to achieve. Therefore, it is necessary to provide a gold-based alloy electrical contact sheet and a preparation method thereof, and the gold-based alloy electrical contact sheet with excellent mechanical properties, wear resistance and conductivity is effectively obtained through the cooperative optimization of alloy components and the preparation method. Disclosure of Invention In order to overcome the problems in the background art, the invention constructs a tough coupling structure of high-density nanoscale intermetallic compounds and dislocation networks in an alloy matrix by carrying out cooperative optimization on gold-based alloy components and a preparation method, thereby promoting the gold-based alloy electric contact sheet to have better mechanical property, higher wear resistance and higher electric conductivity. In order to achieve the above purpose, the present invention is realized by the following technical scheme: The invention provides a gold-based alloy electric contact sheet which comprises, by mass, 25% -30% of palladium, 15% -20% of silver, 1% -5% of tin and the balance of gold. The invention further provides a preparation method of the gold-based alloy electric contact sheet, which comprises the following steps: (1) And in an inert gas protection environment, mixing and smelting palladium, silver, tin and gold raw materials, and casting to obtain an ingot. (2) And (3) carrying out solution treatment on the cast ingot in the step (1). (3) And (3) carrying out multi-pass cold forging on the ingot casting subjected to the solution treatment in the step (2) to obtain a plate. (4) And (3) carrying out multi-pass hot rolling on the plate in the step (3) in an inert atmosphere protection environment to obtain a hot rolled blank, and carrying out heat preservation on a hot rolled piece after each-pass hot rolling. (5) And (3) annealing the hot rolled blank in the step (4) in an inert atmosphere protection environment to obtain an annealed blank. (6) And (3) sequentially carrying out multi-pass cold rolling and aging treatment on the annealed blank in the step (5) to obtain a sheet, wherein in the multi-pass cold rolling process, each time of rolling is carried out for 5-8 times, the low-temperature tempering is carried out, and the aging treatment is carried out in an inert atmosphere protection environment. (7) And (3) carrying out surface treatment on the sheet material in the step (6) to obtain the gold-based alloy electric contact sheet. Preferably, in the step (1), the smelting temperature is 1300-1400 ℃ and the smelting time is 10-15min. Preferably, in the step (2), the solid solution temperature is 1140-1160 ℃, the heat preservation time is 3.5-4h, and the cooling rate is more than or equal to 200 ℃ per second after heat preservation. Preferably, in the step (3), the single deformation amount of the cold forging is less than or equal to 5%, and the accumulated deformation amount of the cold forging is 50-75%. Preferably, in the step (4), the plate is heated to 700-750 ℃, kept at the temperature for 40-60min, and then subjected to hot rolling at the kept temperature for 5-10min at the temperature of 700-750 ℃ after each hot rolling, wherein the single-pass deformation of the multi-pass hot rolling is less than or equal to 5%, and the total deformation of the multi-pass hot rolling is 40