采用AgCu-4.5Ti钎料直接钎焊TC4钛合金与SiO2复合材料,研究了接头界面组织结构及形成机理,分析了不同工艺参数下界面变化对接头抗剪强度的影响.研究表明:接头界面典型结构为SiO2复合材料/TiSi2/Cu4Ti3+Cu3Ti3O/Ag(s,s)+Cu(s,s)/TiCu/Ti2Cu/α,β-Ti/TC4;钎焊温度的升高可促进两侧母材界面反应层厚度的增加,同时钎缝中部的AgCu共晶组织消失,化合物相增多;随着接头界面结构的变化,接头抗剪强度表现出先升高后降低的趋势:当钎焊温度为850℃,保温10 min时,接头室温最高抗剪强度达到7.8 MPa.
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