Sb元素及稀土对Zn-10Al基钎料及钎焊接头性能影响

向Zn-10Al-5Cu基体中添加元素Sb及稀土镧钕，采用真空炉、万能材料试验机、金相及扫描电镜等设备，研究了Sb元素及稀土添加量对Zn-10Al-5Cu组织、性能及钎焊接头性能的影响.结果表明，钎料合金的铺展面积随Sb元素添加量的增加先较快增大后又趋于稳定趋势；抗拉强度随Sb元素添加量的增加而稳定增加；钎料组织由共析与共晶组织混合而成；在优选出的Zn10Al5Cu1.5Sb钎料中添加稀土镧钕，钎料的润湿性得到进一步改善，当稀土添加量为0.15%时，钎料的润湿性最佳；此时钎料组织中灰色粗大树枝晶组织及黑色层块状组织减少、灰黑相间层片状组织增多且变的细小，基体组织得到最大程度细化，钎料合金及钎焊接头强度达到最大；继续增加稀土，钎料合金的润湿性及钎焊接头的抗剪强度反而下降.

Effects of Sb and rare earth on properties of Zn-10Al based brazing filler metals and brazed joints

Adding elements of Sb and rare earth to Zn-10Al-5Cu based brazing filler metals, using vacuum furnace, universal material testing machine, metallographic and scanning electron microscope equipment, the influence of Sb and rare earth additions on the microstructure, properties of Zn-10Al-5Cu based brazing filler metals and properties of brazed joints were studied. The results show that the spreading area of brazing filler increases rapidly with the addition of Sb element, and then tends to be stable. The tensile strength increase with the addition of Sb increased steadily increased. The structure of brazing filler is formed by mixing eutectoid and eutectic structure. Adding rare earth LaNd in selected Zn10Al5Cu1.5Sb brazing filler, the wettability of filler metal has been further improved, when the dosage is 0.15%, the wettability of brazing filler at best, In this case, the dendrite structure of grey and coarse tree and the black layer block tissue are reduced, gray and black lamellar microstructure increase and become small, the based tissue is maximally refined, the strength of the filler metal and brazed joints reaches the maximum. continue to increase of the amount of rare earth, the wettability of brazing filler and the shear strength of brazed joints decreased instead.