The microstructure and mechanical properties of C/C composite/Ti3Al alloy brazed joint with graphene nanoplatelet strengthened Ag-Cu-Ti filler
The microstructure and mechanical properties of C/C composite/Ti3Al alloy brazed joint with graphene nanoplatelet strengthened Ag-Cu-Ti filler
复制标题
石墨烯纳米片增强Ag-Cu-Ti填料C/C复合材料/Ti3Al合金钎焊接头的显微组织与力学性能
DOI：
10.1016/j.ceramint.2019.01.203
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发表时间：
2019-05-01
影响因子：
5.2
通讯作者：
Li, Fei
中科院分区：
文献类型：
--
作者：
Guo, Wei;Zhang, Hongqiang;Li, Fei
采用石墨烯纳米片（GNP）增强Ag-Cu-Ti复合钎料钎焊C/C复合材料和Ti 3Al合金。钎焊接头具有良好的结合界面，接头组织为TiC、Ti（Cu，Al）、GNP、AlCu 2 Ti相。结果表明，纳米颗粒的加入可以减小TiC层的厚度。GNP阻碍了原子扩散，抑制了Ti 3Al合金侧TiCu相的生长。钎焊接头的剪切强度随GNP含量的增加先增大后减小，当GNP含量为0.1wt. %. GNP的加入降低了C/C复合材料与Ti 3Al合金之间的热膨胀系数失配，消除了残余应力，提高了接头强度。
Carbon/carbon (C/C) composite and Ti3Al alloy were brazed using graphene nanoplatelet (GNP) strengthened Ag-Cu-Ti composite filler. The brazed joint had the excellent bonding interface, and the microstructure of joint contained TiC, Ti(Cu,Al), GNPs, AlCu2Ti phases. Results showed that the GNPs addition could decrease the thickness of TiC layer. GNPs hindered the atom diffusion and inhibited the growth of TiCu phase on the Ti3Al alloy side. The shear strength of brazed joint first increased and then decreased with the increase of GNPs content, and the brazed joint reached to the highest shear strength 26.7 MPa when GNPs content was 0.1 wt. %. GNPs could reduce the CTE mismatch between C/C composite and Ti3Al alloy, and improve the joint strength due to the relief of residual stress.