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采用Zn-Al钎料实现了TC4钛合金和55%SiCp/Al复合材料的非真空刮涂钎焊。借助扫描电镜和能谱分析等测试手段,分析了接头的显微组织结构。借助电子万能试验机对接头的剪切强度进行了测试。结果表明:接头中复合材料侧界面氧化膜完全消失;当焊接保温时间为5 min,复合材料中的SiC颗粒向钎缝中少量迁移;当焊接保温时间为20 min,复合材料中两种尺寸为10、50μm的SiC颗粒大量向钎缝中迁移;在钛合金侧表面只生成了一种金属间化合物TiAl3相,平均厚为2~10μm;剪切强度测试时试样接头均断裂于钎缝中,最高剪切强度可达163 MPa。
The vacuum brazing of TC4 titanium alloy and 55% SiCp / Al composites was achieved by using Zn-Al brazing filler metal. With the help of scanning electron microscope and energy spectrum analysis, the microstructure of the joint was analyzed. The shear strength of the joint was tested by electronic universal testing machine. The results show that the oxide film on the interface of the composite material disappears completely. When the welding holding time is 5 min, the SiC particles in the composite material migrate a little to the brazing seam. When the welding holding time is 20 min, 10,50μm SiC particles migrated to the brazing seam in a large amount; only one intermetallic TiAl3 phase was formed on the side surface of the titanium alloy with an average thickness of 2 ~ 10μm; the specimen joints were broken in the brazing seam during the shear strength test , The highest shear strength up to 163 MPa.