C_f/SiC复合材料与钛合金(Ti-Zr-Cu-Ni)+W复合-扩散连接  

Composite-diffusion bonding of carbon fiber reinforced C_f/SiC composite and Ti alloy with(Ti-Zr-Cu-Ni)+W composite filler

作　　者：崔冰[1] 黄继华[1] 蔡创[1] 陈树海[1] 

机构地区：[1]北京科技大学材料与工程学院,北京100083

出　　处：《焊接学报》2013年第6期49-52,115,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51175037)

摘　　要：采用(Ti-Zr-Cu-Ni)+W复合钎料作为连接层,在连接温度930℃,保温时间5min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,利用剪切试验测试接头力学性能.结果表明,钎焊时复合钎料中的钛、锆与Cf/SiC复合材料反应,在Cf/SiC复合材料与连接层界面生成Ti3SiC2,Ti5Si3和少量TiC(ZrC)化合物的混合反应层,连接层的铜、镍与钛合金中的钛发生相互扩散,在连接层与钛合金界面形成Ti-Cu化合物过渡层.对钎焊接头进行900℃,保温60 min扩散处理后,连接层组织达到均一化,母材TC4合金侧过渡层增厚.扩散处理后接头强度为99 MPa,较钎焊接头强度65 MPa提高了52%.Carbon fiber reinforced SiC(Cf/SiC) was successfully vacuum brazed to Ti alloy with(Ti-Zr-Cu-Ni)+W composite filler at 930 ℃ for 5 min.The interface microstructure was investigated with scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and X-ray diffraction(XRD).The mechanical properties of the brazed joints were measured by mechanical testing machine.The results show that Ti and Zr in the interlayer can react with the Cf/SiC composite,and the brazed seams mainly consist of Ti3SiC2,Ti5Si3,and some TiC(ZrC) reaction products.The mutual diffusion between Ti from the Ti alloy substrate and Cu and Ni from the interface formed the diffusion-reaction layer between the interlayer and Ti alloy substrate.After heat treating the brazed joint at 900 ℃ for 60 min,the interlayer microstructure became homogenization and the diffusion layer on TC4 alloy side thickened,and the shear strength of the joint reached 99 MPa,increased 52% comparing with that(65 MPa) before heat treatment.

关 键 词：碳纤维增强碳化硅复合材料 钛合金 复合-扩散连接 

分 类 号：TG407[金属学及工艺—焊接]