中文摘要：

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／a，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10min时，接头室温最高抗剪强度达到7．8MPa。

英文摘要：

The TC4 alloy was brazed to SiO2 composite using AgCu-4.5Ti filler alloy. The interracial microstructure of joint was analysed and its formation mechanism was discussed. The influence of brazing temperature on the interracial microstructure and the shear strength of joints was studied. The typical interracial microstructure was SiO2 composite/TiSi2/Cu4Ti3＋Cu3Ti30/Ag（s, s）＋Cu（s, s）/TiCu/Ti2Cu/a, β-Ti/TC4 alloy at brazing temperature 850 ℃, for 10 min. The increase of brazing temperature would increase the thickness of interracial reaction layers near SiO2 composite and TC4 alloy, and the AgCu eutectic microstructure would disappear at 870 ℃. The shear strength of joint also changes with the increase of temperature. The shear strength of the joints reaches a maximum of 7.8 MPa when the temperature is 850 ℃ and the holding time 10 min.