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通过添加0-1.0%(质量分数)的Cu或Sn来合金化4343合金,获得一种熔点更低、抗塌陷性能更优良的钎焊材料。熔点测试结果表明,随Cu或Sn含量的增加,合金的固相线温度和液相线温度逐渐降低,添加1.0%的Cu或Sn后合金固相线温度、液相线温度降低10-15℃。微观组织和挤压变形后力学性能研究结果表明,随Cu或Sn含量的增加,铸态合金中含Cu的第二相量或Sn颗粒逐渐增多;热挤压后含Cu第二相趋于溶解,而Sn促进含Si、Fe第二相溶解;合金室温抗拉强度逐渐升高,但延伸率略有降低。模拟钎焊实验结果表明,添加Cu或Sn可降低4343合金的可钎焊温度,添加1.0%的Cu或Sn可使钎焊温度降低15-20℃。
By adding 0-1.0% (mass fraction) of Cu or Sn alloy 4343 alloy, a lower melting point, better anti-collapse properties of brazing material. Melting point test results show that with the increase of Cu or Sn content, the solidus temperature and the liquidus temperature gradually decrease. Adding 1.0% Cu or Sn alloy solidus temperature, the liquidus temperature decreased by 10-15 ℃ . The results of microstructure and mechanical properties after extrusion show that with the increase of Cu or Sn content, the amount of second phase or Sn particles containing Cu gradually increases, and the second phase containing Cu tends to dissolve after hot extrusion , While Sn promoted the dissolution of the second phase containing Si and Fe. The tensile strength at room temperature gradually increased but the elongation decreased slightly. The results of simulated brazing experiment show that the addition of Cu or Sn can reduce the brazing temperature of 4343 alloy, and the addition of 1.0% Cu or Sn can reduce the brazing temperature by 15-20 ℃.