Ti元素对Zn-22Al钎料组织和性能的影响

Effect of titanium on microstructure and properties of Zn-22Al filler metals

摘要: 研究了Ti元素对Zn-22Al钎料的电阻率、熔化温度、铺展性能、显微组织以及接头抗剪强度的影响.结果表明,随着钎料中Ti元素含量的增加,钎料的电阻率、熔化温度略有增加,铺展性能显著改善.当Ti元素质量分数为0.03%时,钎料的铺展性能最佳,但过量的Ti元素会明显恶化钎料的铺展性能.随着Ti元素的加入,钎料的基体组织得到细化,η-Zn相尺寸减小;当Ti元素质量分数大于0.15%时,钎料中的η-Zn相开始聚集长大.当Zn-22Al钎料中Ti元素质量分数为0.03%时,钎焊接头的抗剪强度达到最大值84.64 MPa.

Abstract: The effects of the titanium on the resistivity, melting temperature, spreadability, microstructure, and shear strength of Zn-22Al filler metal were studied.The results indicated that with the addition of Ti, the resistivity and the melting temperature rose slightly, and the spreadability was significantly improved especially when the content of Ti was 0.03%.However, the addition of excessive amount of Ti would deteriorate the spreadability of Zn-22Al filler metal.It has been found that Ti could refine the microstructure of the filler metal, and the size of η-Zn phase decreases remarkably.When the content of Ti exceeds 0.15%, the η-Zn phase tends to become coarse, and the shear strength of Cu/Al joint reaches the peak value 84.64 MPa when brazed with Zn-22Al-0.03Ti filler metal.