用镍钛钎料钎焊的碳化硅接头的微观结构控制、性能及热力学分析
Microstructure Controlling, Properties, and Thermodynamic Analysis of SiC Joints Brazed with Ni-Ti Fillers.
作者信息
Li Ming, Liu Zihao, Yan Jiazhen, Shi Haojiang, Wu Jiang, Li Renxin, Peng Huabei, Zhang Ruiqian, Shang Jiacheng
机构信息
Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China.
School of Mechanical Engineering, Sichuan University, No. 24 South Rd, Yihuan Rd, Wuhou District, Chengdu 610065, China.
出版信息
Materials (Basel). 2025 Jun 16;18(12):2816. doi: 10.3390/ma18122816.
Silicon carbide (SiC) ceramics were brazed with Ni-Ti fillers at 1350 °C for 10 min. The experimental results show that with the increase in Ti content in the fillers, the interface layer composed of NiSi, NiSi, graphite, and TiC becomes thinner due to the inhibition of the Ti/SiC reaction on the Ni/SiC reaction. When Ni-45Ti filler is used, TiC becomes the only phase of the interface layer in the brazing seam. The elimination of graphite improves the mechanical property of the joints. The shear strength of the SiC joints brazed by Ni-15Ti, Ni-30Ti, and Ni-45Ti fillers is 33 MPa, 92 MPa, and 125 MPa, respectively. From the point of thermodynamics, the calculated component point of the Ni/SiC reaction transition to the Ti/SiC reaction is = 31 at.%. When the Ti content is higher than 31 at.%, the Δ > Δ, and TiC will be preferentially generated at the interface. Therefore, the Ni/SiC reaction is inhibited and the harmful graphite is eliminated.
碳化硅（SiC）陶瓷在1350℃下用Ni-Ti钎料钎焊10分钟。实验结果表明，随着钎料中Ti含量的增加，由NiSi、NiSi、石墨和TiC组成的界面层由于Ti/SiC反应对Ni/SiC反应的抑制作用而变薄。当使用Ni-45Ti钎料时，TiC成为钎缝中界面层的唯一相。石墨的消除提高了接头的力学性能。用Ni-15Ti、Ni-30Ti和Ni-45Ti钎料钎焊的SiC接头的剪切强度分别为33MPa、92MPa和125MPa。从热力学角度来看，Ni/SiC反应转变为Ti/SiC反应的计算成分点为 = 31原子%。当Ti含量高于31原子%时，Δ > Δ，并且TiC将优先在界面处生成。因此，Ni/SiC反应受到抑制，有害石墨被消除。
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