High-strength and high-conductivity copper alloy for power switch spring contact and preparation method of high-strength and high-conductivity copper alloy

[0026] Example one

[0027] Put the steel mold into the resistance furnace and bake it at 800°C for 15 minutes, then put it into the vacuum melting furnace. Weigh 11.456kg of Cu-CATH-1 block, 0.36kg of Cu-Cr master alloy block with 30% Cr mass fraction, put it in a spinel ceramic crucible, mix and melt at 1350℃, and weigh 0.04kg of Cu-P For the master alloy, remove the oxygen in the alloy melt, and sequentially put 0.024kg of sponge Zr and 0.16kg of Cu-Ti master alloy with 5% Ti mass fraction into the alloy hopper into the vacuum melting furnace, and the vacuum melting furnace is pumped Vacuum to 3.0Pa, temperature rise to 1350℃ and keep for 14min. Cast into a steel mold at 1250°C and cool to room temperature to obtain CuCrZrTi alloy material. Then, the obtained alloy material is hot-extruded at 860°C, extruded into a bar, and then subjected to cold working and water-cooled intermediate annealing, the annealed bar is heated to 450°C, and subjected to vacuum aging heat treatment for 4 hours, and then prepared To the required size, the product is obtained.

[0028] Example two

[0029] Put the steel mold into a resistance furnace and bake at a constant temperature of 820°C for 13 minutes, then put it into a vacuum melting furnace. Weigh 11.464kg of Cu-CATH-1 block, 0.33kg of Cu-Cr master alloy block with 30% Cr mass fraction, put it in a spinel ceramic crucible and mix and melt at 1380℃, and weighed 0.04kg Cu- P master alloy, remove the oxygen inside the alloy melt, sequentially put 0.0216kg sponge Zr and 0.144kg Ti Cu-Ti master alloy with a mass fraction of 5% into the alloy hopper and put it into the vacuum melting furnace, and the vacuum melting furnace is evacuated To 6.3Pa, the temperature rises to 1380℃ and keeps for 14min. Cast into a steel mold at 1260°C and cool to room temperature to obtain CuCrZrTi alloy material. Then, the prepared alloy material is hot-extruded at 850°C, extruded into a bar, and then subjected to cold working and water-cooled intermediate annealing, the annealed bar is heated to 500°C, and subjected to vacuum aging heat treatment for 5 hours, and then prepared To the required size, the product is obtained.

[0030] Example three

[0031] Put the steel mold into the resistance furnace and bake it at a constant temperature of 850°C for 12 minutes, carefully coat the inner wall of the steel mold with a layer of high temperature resistant casting paint, and put it into the vacuum melting furnace. Weigh 11.517kg of Cu-CATH-1 block, 0.345kg of Cu-Cr master alloy block with 30% Cr mass fraction, put it in a spinel ceramic crucible, mix and melt at 1400℃, and weigh 0.04kg Cu-P For master alloy, remove oxygen from the alloy melt, and sequentially put 0.018kg sponge Zr and 0.08kg Cu-Ti master alloy with 5% Ti mass fraction into the alloy hopper and add it to the vacuum melting furnace, and the vacuum melting furnace is evacuated To 6.3Pa, when the temperature rises to 1400℃, keep it for 10min. Cast into a steel mold at 1300°C and cool to room temperature to obtain CuCrZrTi alloy material. Then, the obtained alloy material is hot-extruded at 880°C, extruded into a bar, and then subjected to cold working and water-cooled intermediate annealing, the annealed bar is heated to 450°C, and subjected to vacuum aging heat treatment for 3 hours, and then prepared To the required size, the product is obtained.

[0032] Table 1 shows the comparison of various properties between the product prepared in Example 1 and the commercially available CuCo2Be alloy material:

[0033] Table 1 Performance comparison of CuCrZrTi and CuCo2Be alloy materials

[0034] Material name

[0035] From the performance test results in Table 1, it can be seen that the product prepared in Example 1 has a strength of 647MPa which is slightly lower than that of CuCo2Be alloy material (but it is higher than ASTM B624-07 "High-strength, high-conductivity copper alloy standard for electrical The minimum strength requirement in the Code is 414MPa), its elongation and electrical conductivity are higher than CuCo2Be alloy materials, especially the electrical conductivity is 36% higher than CuCo2Be alloy materials.

[0036] The test results show that the CuCrZrTi alloy material prepared by the present invention has excellent comprehensive properties, can completely replace the CuCo2Be alloy material, and can be used for commercial mass production of power switch spring contacts.