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<p>A surface Ni/Cu coating was applied to the TiC-Ni cermet using the resistive evaporation method. Subsequently, the coated cermet was joined to itself by vacuum brazing using the Ag-Cu28 brazing alloy. The study investigated the formation mechanism of the joints and the impacts of heating temperature and holding time on the joint’s interfacial microstructure and mechanical properties. The results showed that during the heat treatment, the atoms within the Ni/Cu coating interdiffused, forming a continuous (Cu, Ni) layer adjacent to the cermet interface, which could promote the wettability of the liquid alloy and increase the shear strength of joints. The typical microstructure of the joints was TiC-Ni/(Cu, Ni)/Ag(s,s) + Cu(s,s)/(Cu, Ni)/TiC-Ni. Meanwhile, the joint shear strength achieved a maximum value of 146&#xa0;MPa with a heating temperature of 800&#xa0;°C for 10&#xa0;min. And the joint fracture occurred in the interfacial region between the base material and the (Cu, Ni) reaction layer. The reaction layer became discontinuous with an increase in temperature or time. With increasing temperature, the shear strength tended to increase first and then decrease. With the extension of time, the shear strength gradually decreased.</p>

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Interfacial Microstructure and Mechanical Properties of TiC-Ni Cermet Joint Brazed with Ag-Cu28 Alloy

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Qingze Zheng,
  • Min Lei,
  • Haichun Liu,
  • Zixiong Wei,
  • Yulong Li

摘要

A surface Ni/Cu coating was applied to the TiC-Ni cermet using the resistive evaporation method. Subsequently, the coated cermet was joined to itself by vacuum brazing using the Ag-Cu28 brazing alloy. The study investigated the formation mechanism of the joints and the impacts of heating temperature and holding time on the joint’s interfacial microstructure and mechanical properties. The results showed that during the heat treatment, the atoms within the Ni/Cu coating interdiffused, forming a continuous (Cu, Ni) layer adjacent to the cermet interface, which could promote the wettability of the liquid alloy and increase the shear strength of joints. The typical microstructure of the joints was TiC-Ni/(Cu, Ni)/Ag(s,s) + Cu(s,s)/(Cu, Ni)/TiC-Ni. Meanwhile, the joint shear strength achieved a maximum value of 146 MPa with a heating temperature of 800 °C for 10 min. And the joint fracture occurred in the interfacial region between the base material and the (Cu, Ni) reaction layer. The reaction layer became discontinuous with an increase in temperature or time. With increasing temperature, the shear strength tended to increase first and then decrease. With the extension of time, the shear strength gradually decreased.