Vacuum brazing of the Gr/2024Al composite and TC4 alloy using AgCuTi filler alloy with Ni-Al interlayer as auxiliary heat source
Vacuum brazing of the Gr/2024Al composite and TC4 alloy using AgCuTi filler alloy with Ni-Al interlayer as auxiliary heat source
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DOI：
10.1016/j.jallcom.2016.10.049
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发表时间：
2017-02
影响因子：
6.2
通讯作者：
J. M. Shi;J. Feng;Haitao Liu;X. Tian;Leijiang Zhang
中科院分区：
文献类型：
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作者：
J. M. Shi;J. Feng;Haitao Liu;X. Tian;Leijiang Zhang
采用AgCuTi钎料，以Ni-Al中间层为辅助热源，在真空条件下对Gr/2024 Al复合材料与TC 4钛合金进行钎焊。由于Ni-Al中间层的热爆合成反应，产生并释放大量的热量，保证了AgCuTi钎料的熔化以及Gr/2024 Al复合材料与TC 4合金的低温钎焊。该方法避免了Gr/2024 Al复合材料在高温钎焊时Al的挥发，保持了Gr/2024 Al复合材料的性能。SEM分析结果表明，Gr/2024 Al复合材料与AgCuTi钎料发生反应，在其附近形成了Ti 3AlC 2层，这是获得良好接头的关键因素。Ni-Al中间层经热爆合成反应生成一系列Ni-Al化合物。Ni和Al的粒度对热爆合成反应有重要影响，进而影响界面反应和Ni-Al化合物的形成。当Ni颗粒直径为10 μm，Al颗粒直径为7 μm时，复合材料的抗剪强度最大，达到13 MPa。裂纹主要发生在Gr/2024 Al复合材料中，并在远离钎焊缝的复合材料中扩展。
In vacuum, the Gr/2024Al composite and TC4 alloy were brazed using AgCuTi filler alloy with the assist of Ni-Al interlayer as auxiliary heat source. Because of the thermal explosion synthesis reaction of Ni-Al interlayer, lots of heat can be produced and released, which promises that AgCuTi filler alloy melts and the Gr/2024Al composite and TC4 alloy brazes at low temperature. This method avoids the volatilization of Al in the Gr/2024Al composite at high brazing temperature, keeping the property of the Gr/2024Al composite. According to SEM analysis result, the Gr/2024Al composite reacts with the AgCuTi filler alloy to form a Ti3AlC2layer adjacent to the composite, which is the key factor to obtain a perfect joint. A series of Ni-Al compounds form after the thermal explosion synthesis reaction of the Ni-Al interlayer. The particle sizes of Ni and Al have important effects on the thermal explosion synthesis reaction, and then influence the interfacial reaction and the formation of the Ni-Al compounds. The maximum shear strength reaches 13 MPa when the diameter of the Ni and Al particles are 10 μm and 7 μm respectively. Cracks primarily happen in the Gr/2024Al composite and propagate in the composite away from the brazing seam.