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本文采用CuMnNiCrSi钎料实现了对Ti(C,N)基金属陶瓷与低碳钢的真空钎焊连接。研究了钎焊温度和保温时间对钎焊接头剪切强度的影响,通过XRD、SEM和EDS对接头的物相、显微组织、元素分布及断口形貌进行分析。研究表明:在钎焊温度为1030℃,保温时间为20 min的工艺条件下,钎焊接头的结合强度达到最大,其剪切强度为301.5 MPa。Ti(C,N)基金属陶瓷/低碳钢焊缝由α-Ti基固溶体和Cr基固溶体构成。在金属陶瓷一侧的界面处形成Cu基固溶体,在钢一侧形成(Cu,Ni)固溶体和(Fe,Ni)固溶体。Ti(C,N)基金属陶瓷/低碳钢接头断裂发生在Cu基钎料处,其断裂方式为韧性断裂。
In this paper, vacuum brazing of Ti (C, N) -based cermets with mild steel was achieved using CuMnNiCrSi brazing filler metal. The effects of brazing temperature and holding time on the shear strength of brazed joints were studied. The phase, microstructure, elemental distribution and fracture morphology were analyzed by XRD, SEM and EDS. The results show that the bonding strength reaches the maximum at the brazing temperature of 1030 ℃ and the holding time of 20 min, and the shear strength reaches 301.5 MPa. The Ti (C, N) -based cermet / low carbon steel weld consists of α-Ti-based solid solution and Cr-based solid solution. A Cu-based solid solution is formed at the interface of the cermet and a (Cu, Ni) solid solution and a (Fe, Ni) solid solution are formed on the steel side. Ti (C, N) -based cermet / mild steel joint fracture occurs at the Cu-based brazing filler metal and the fracture mode is ductile fracture.