制冷行业用新型银钎料火焰钎焊H62黄铜的接头组织和性能

Microstructure and properties of H62 brass by torch brazed joints with novel silver filler metals in refrigeration industry

以BAg45Cu Zn钎料为基体,在其表面化学镀锡,用于H62黄铜的火焰钎焊连接。借助扫描电镜(SEM)分析H62黄铜钎焊接头的微观组织,并利用万能试验机测试钎焊接头的抗拉强度。结果表明,钎料表面化学镀锡后,母材与钎缝结合紧密,钎焊接头组织主要由富Cu相、Ag相、Cu Zn和Cu5Zn8化合物相组成。随着镀锡含量的升高,钎焊接头抗拉强度逐渐增高。在Sn含量为2.5%时,钎焊接头抗拉强度最高为352 MPa。

H62 brass joints were brazed successfully using BAg45 CuZn filler metals plated tin coatings.SEM was used to observe the microstructure of H62 brass brazed joint.The tensile strength of H62 brass brazed joints was tested using tensile test machine.The results show that the interface brazed seam and H62 brass produce sound brazed joints after tin electroless plated on substrate filler metal.Then the microstructure of brazed joints were composed of Cu-rich phase,Ag phase,CuZn phase and Cu_5Zn_8 compound phase.The tensile strength of brazed joints increase with plating tin content being increased.When the tin content is 2.5%,the maximum tensile strength of brass brazed joints is 352 MPa.