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在Cu-21Sn-12Ti钎料中添加不同质量分数的B粉制备Cu-Sn-Ti+B复合钎料,然后在钎焊温度910℃保温10 min条件下钎焊Al2O3与Ti-6Al-4V合金。研究了原位生成TiB对Al2O3/Ti-6Al-4V合金接头微观结构及力学性能的影响。接头中原位生成的TiB呈晶须状均匀分布在Ti2Cu上,当采用TiB体积分数低于40%的钎料钎焊Al2O3与Ti-6Al-4V合金时,均可获得连接良好且界面致密的钎焊接头。随接头中TiB的体积分数增加,Ⅱ区中的Ti2(Cu,Al)含量增加,并逐渐变得连续,TiB的分布区Ⅲ范围增宽,Ti-6Al-4V合金向钎料中的溶解量增加。接头的室温抗剪强度随TiB的体积分数增加先上升后下降,当接头中TiB体积分数增至20%时,接头抗剪强度达最大,为70.1MPa。
The Cu-Sn-Ti + B composite solder was prepared by adding B powder with different mass fraction to Cu-21Sn-12Ti solder, and then brazing Al2O3 and Ti-6Al-4V alloy at the brazing temperature 910 ℃ for 10 min . The effect of TiB formation on the microstructure and mechanical properties of Al2O3 / Ti-6Al-4V alloy joints was investigated. The TiB generated in situ in the joint is uniformly distributed on the Ti2Cu in a whisker-like manner. When the brazing of Al2O3 and Ti-6Al-4V alloy with a TiB volume fraction of less than 40% can be obtained, a well- Welding head. With the increase of volume fraction of TiB in the joint, the content of Ti2 (Cu, Al) in zone Ⅱ increases and gradually becomes continuous, and the range of distribution area Ⅲ of TiB broadens. The dissolved amount of Ti-6Al-4V alloy into the solder increase. The shear strength of the joint at room temperature first increases and then decreases with the increase of volume fraction of TiB. When the volume fraction of TiB in the joint increases to 20%, the joint shear strength reaches 70.1 MPa.