Cf/SiC复合材料与钛合金(Ti-Zr-Cu-Ni)+W复合钎焊分析

在适当的工艺参数下,用(Ti-Zr-Cu-Ni)+W复合钎料真空钎焊Cf/SiC复合材料与钛合金,采用SEM,EDS和XRD分析接头组织结构,利用剪切试验检测接头的力学性能.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,在连接层与钛合金界面形成Ti-Cu化合物扩散层.增强相钨粉能有效缓解接头的残余热应力,提高接头力学性能,在连接温度930℃,保温时间20 min的工艺条件下,增强相钨粉含量为15%(体积分数)时,接头抗剪强度最高为166 MPa.

Brazing of Cf/SiC composite to Ti alloy with (Ti-Zr-Cu-Ni)+W composite filler material

C_f/SiC composite was successfully joined to Ti alloy with (Ti-Zr-Cu-Ni)+W composite filler material with the proper parameters.The interfacial microstructures of the brazed joints were investigated by SEM,EDS and XRD.The mechanical properties of the brazed joints were tested by mechanical properties test.The results showed that Ti and Zr elements in the filler material can make a reaction with the C_f/SiC composite during the brazing process.A mixture of Ti₃SiC₂,Ti₅Si₃ and a small amount of TiC(ZrC) compounds finally form adjacent to the C_f/SiC composite.Ti alloy constantly dissolves and Cu,Ni elements diffuse into the Ti alloy,and then form the diffusion reaction layers between interlayer and Ti alloy.The addition of reinforced phase W particles is markedly beneficial on relaxing the thermal stress and improving the strength of the joints.The maximum shear strength of the brazed joints is 166 MPa.