摘要
Ag-Cu-Ti复合钎料中加入Ti粉和石墨碳粉作为中间层,在适当的工艺条件下真空钎焊C_f/SiC复合材料与TC4。利用SEM,EDS,XRD分析接头微观组织,利用剪切试验检测接头力学性能。结果表明:钎焊时,复合钎料中的Ti与C_f/SiC复合材料反应,在C_f/SiC复合材料与连接层界面形成由Ti_3SiC_2相、Ti_5Si_3相和少量TiC化合物组成的混合反应层。复合钎料中的Cu与Ti合金中的Ti发生互扩散,在连接层与Ti合金界面形成不同Ti含量的Cu-Ti化合物过渡层。钎焊后,连接层中Ti和石墨碳反应形成的TiC微粒均匀分布在复合连接层中,缓和了接头的热应力。当连接温度为910℃,保温时间为25 min时,可得到接头剪切强度为145 MPa。
C_f/SiC composites was successfully joined to Ti alloy with Ag-Cu-Ti-(Ti+C)mixed powder by proper brazing parameters under the vacuum condition.Microstructures of the brazed joint were investigated by SEM,EDS and XRD.The mechanical properties of the brazed joints were measured by mechanical testing machine.The results showed that Ti element in the interlayer can react with the C_f/SiC composite,a mixture of Ti_3 SiC_2,Ti_5 Si_3,and TiC composites finally forms the reaction layer between composite and interlayer.Ti alloy constantly dissolves and Cu diffuses into the Ti alloy,which forms the diffusion-reaction layers between interlayer and Ti alloy.Ti element react with Graphite C and forms TiC,which distributed evenly in the interlayer and effectively relaxed the thermal stress of the joint.The shear strength of the joint at 910 ℃ for 25 min can reach 145 MPa.
出处
《焊接》
北大核心
2011年第3期60-63,71,共4页
Welding & Joining
作者简介
薛行雁，1984年出生，硕士研究生。主要从事钎焊方面研究工作。
