Joining of C/C composite to TC4 using SiC particle-reinforced brazing alloy
Joining of C/C composite to TC4 using SiC particle-reinforced brazing alloy
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DOI：
10.1016/j.matchar.2010.03.008
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发表时间：
2010-06
影响因子：
4.7
通讯作者：
Youqiong Qin;Zhishui Yu
中科院分区：
文献类型：
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作者：
Youqiong Qin;Zhishui Yu
碳化硅颗粒用作Ag-26.7Cu-4.6Ti（wt.%）用于将C/C复合材料连接到TC 4的钎焊合金（Ti-6Al-4V，wt.%）。通过剪切强度试验测定了钎焊接头的力学性能。研究了SiC颗粒体积分数对钎焊接头显微组织的影响。结果表明，当体积分数为15%时，接头的抗剪强度最高可达29 MPa SiC钎料的抗压强度比Ag-26.7Cu-4.6Ti钎料的抗压强度高（22 MPa）。Ti与SiC颗粒反应，在颗粒增强钎焊合金中形成Ti-Si-C化合物。因此，钎料中SiC颗粒的增多，使C/C复合材料附近TiC/TiCu反应层的厚度减小。此外，添加到钎焊合金中的SiC颗粒可以降低钎焊合金的CTE，这导致C/C复合材料-金属接头中的较低残余应力。这两个原因都导致了钎焊接头剪切强度的提高。但在钎料中加入过量的SiC颗粒会导致气孔的产生，从而导致钎焊接头的强度降低。
Silicon carbide particles were used as reinforcement in the Ag-26.7Cu-4.6Ti (wt.%) brazing alloy for joining C/C composite to TC4 (Ti-6Al-4V, wt.%). The mechanical properties of the brazed joints were measured by shear strength testing. The effects of the volume percentage of SiC particles on the microstructures of the brazed joints were investigated. It is shown that the maximum shear strength of the joints is 29MPa using 15vol.% SiC in the brazing alloy which is greater than that with Ag-26.7Cu-4.6Ti brazing alloy alone (22MPa). Ti is reacted with SiC particles, forming Ti–Si–C compound in the particle-reinforced brazing alloy. Due to this, more SiC particles in the brazing alloy, the thickness of TiC/TiCu reaction layer near C/C composite decreases. Moreover, SiC particles added to the brazing alloy can reduce the CTE of the brazing alloy which results in lower residual stress in the C/C composite-to-metal joint. Both of the above reasons lead to the increasing of the shear strength of the brazed joints. But excessive SiC particles added to the brazing alloy lead to pores which results in poor strength of the brazed joint.