Brazing of C/C composites to Ti6Al4V using multiwall carbon nanotubes reinforced TiCuZrNi brazing alloy
Brazing of C/C composites to Ti6Al4V using multiwall carbon nanotubes reinforced TiCuZrNi brazing alloy
复制标题
使用多壁碳纳米管增强 TiCuZrNi 钎料将 C/C 复合材料钎焊到 Ti6Al4V
DOI：
10.1016/j.jallcom.2015.12.242
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发表时间：
2016
影响因子：
6.2
通讯作者：
Xierong Zeng
中科院分区：
文献类型：
--
作者：
Xin-rui Song;He-jun Li;Xierong Zeng
采用碳纳米管（CNTs）作为增强剂在TiCuZrNi钎焊合金中连接C/C复合材料与Ti6Al4V。研究了CNTs含量对钎焊接头抗剪强度和显微组织的影响。CNTs与钎焊合金中的Ti元素反应，在钎焊过程中原位形成TiC颗粒。添加1 wt.%的CNTs时，接头的表观抗剪强度为38±2 MPa，比未添加CNTs时接头的抗剪强度提高73%。TiC颗粒的原位形成引起了裂纹偏转、界面脱粘和颗粒断裂等增强效应，从而改善了材料的力学性能。当钎焊合金中CNTs含量增加到3 wt.%时，接头强度急剧下降。这是由于C/C复合材料与钎焊之间反应不足造成的。此外，CNTs含量过高会对钎焊合金的润湿性和渗透性产生不利影响。
Carbon nanotubes (CNTs) were used as reinforcements in the TiCuZrNi brazing alloy for joining C/C composites to Ti6Al4V. The effects of CNTs content on the shear strength and microstructure of brazed joints were investigated. The CNTs react with Ti element from the brazing alloy, forming TiC particles in situ during the brazing process. The apparent shear strength of the joints is 38 ± 2 MPa using 1 wt.% CNTs in TiCuZrNi brazing alloy, which is 73% higher than that of the joints without CNTs. An improvement of the mechanical properties was ascribed to the in situ formation of TiC particles which induced the reinforced effects such as crack deflection, interface debonding and particle fracture. When the CNTs content in the brazing alloy increased to 3 wt.%, the joints strength dramatically decreased. This is the result of the insufficient reaction between the C/C composites and the braze. Moreover, the high content of CNTs make negative effects on the wettability and penetrability of the brazing alloy.