C_f/SiC复合材料与钛合金Ag-Cu-Ti-C_f复合钎焊  

Brazing of C_f/SiC composite to Ti alloy with Ag-Cu-Ti-C_f composite filler

作　　者：熊进辉[1] 黄继华[1] 张华[1] 赵兴科[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《焊接学报》2010年第5期77-80,共4页Transactions of The China Welding Institution

基　　金：国家863高技术研究发展计划资助项目(2006AA03A221)

摘　　要：采用Ag-Cu-Ti-Cf(Cf:碳纤维)复合钎料作中间层,在适当的工艺参数下真空钎焊Cf/SiC复合材料与钛合金,利用SEM,EDS和XRD分析接头微观组织结构,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钛与Cf/SiC复合材料反应,在Cf/SiC复合材料与连接层界面形成Ti3SiC2,Ti5Si3和少量TiC化合物的混合反应层.复合钎料中的铜与钛合金中的钛发生互扩散,在连接层与钛合金界面形成不同成分的Cu-Ti化合物过渡层.钎焊后,形成碳纤维强化的致密复合连接层.碳纤维的加入缓解了接头的残余热应力,Cf/SiC/Ag-Cu-Ti-Cf/TC4接头抗剪强度明显高于Cf/SiC/Ag-Cu-Ti/TC4接头.Cf/SiC was successfully joined to Ti alloy with Ag-Cu-Ti-Cf(Cf,carbon fiber)mixed powder by proper brazing parameters.Microstructure of the brazed joints were investigated by SEM,EDS and XRD.Its mechanical properties were meas-ured by mechanical testing machine.The results showed that Ti element in the interlayer can react with the brazed composite,a mixture of Ti3SiC2,Ti5Si3 and TiC composites finally formed in the reaction layer between composite and interlayer.Ti alloy con-stantly dissolves and Cu diffuses into the Ti alloy,which forms the diffusion-reaction layers between interlayer and Ti alloy.The performed joints have dense bonding layers reinforced by short carbon fibers.These composite in brazing layers relaxes the ther-mal stress of the joints effectively.The shear strength of the joint brazed with Ag-Cu-Ti-Cf filler was remarkably higher than that with pure Ag-Cu-Ti filler.

关 键 词：碳纤维增强碳化硅 钛合金 复合钎焊 

分 类 号：TG115.28[金属学及工艺—物理冶金]