BNi2-Ti composite filler developed with which the brazing of C_f/SiC composite to GH99 superalloy was achieved in this study. The effects of Ti content (0-8 wt.%) and brazing temperature (1130-1190 °C) on the microstructure and mechanical properties of brazed joints were investigated. Cross-sectional scanning electron microscopy observations showed a defect-free bonding interface with the content of Ti ranging from 1 wt.% to 5 wt.%. Formation mechanism of the brazed joint shows that Cr in the brazing filler metal reacted with carbon fiber in the composite to produce Cr₃C₂ reaction layer while Ni infiltrated into composite reacted with SiC matrix to produce Ni₃Si and C. The addition of Ti effectively suppressed the infiltration of Ni towards C_f/SiC composite, while reduced the quantity of large-sized Cr₃C₂ compounds, replaced by some uniformly dispersed TiC particles. As the brazing temperature increased, the volume fractions of Ni(s,s) in the brazing seam increased and Cr₃C₂ reaction layer gradually dissolved into the filler metal. When the Ti content was 3 wt.%, brazing temperature 1170 °C, the maximum shear strength of the brazed joint, 43.5 MPa, was achieved.

本研究开发了BNi2-Ti复合填料，可将C _f / SiC复合材料钎焊到GH99高温合金上。研究了钛含量（0-8 wt。％）和钎焊温度（1130-1190°C）对钎焊接头组织和力学性能的影响。截面扫描电子显微镜观察显示出无缺陷的结合界面，其中Ti的含量为1重量％至5重量％。钎焊接头的形成机理表明，钎料中的Cr与复合材料中的碳纤维反应生成Cr ₃ C ₂反应层，而渗入复合材料中的Ni与SiC基体反应生成Ni _3。Si和C。Ti的添加有效地抑制了Ni向C _f / SiC复合材料的渗透，同时减少了由一些均匀分散的TiC颗粒代替的大尺寸Cr ₃ C ₂化合物的数量。随着钎焊温度的升高，钎焊缝中Ni（s，s）的体积分数增加，并且Cr ₃ C ₂反应层逐渐溶解在填充金属中。当Ti含量为3wt。％，钎焊温度为1170℃时，钎焊接头的最大剪切强度为43.5MPa。