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| Influence of SPS Temperature on Microstructure and Shear Strength of Copper/Nickel Powder/304 Stainless Steel Joints |
| TANG Qian, WU Shiwen, ZHAO Weikang, XIA Lihong, ZHANG Fuqin |
| (Key Laboratory of Lightweight, High Strength Structural Materials, Central South University, Changsha 410083, China） |
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Abstract Copper/304 stainless steel joints with nickel powder were prepared by spark plasma sintering (SPS). The
influence of welding temperature on the microstructure and mechanical properties of the joint was studied. Copper and
304 stainless steel can be welded by using nickel powder as inter-layer. Cu/Ni diffusion layer and Ni/SS304 diffusion layer
formed at the joint interface because of the elemental inter-diffusion. The results showed that the diffusion of copper in
nickel is greater than that in stainless steel, and the thickness of Cu/Ni diffusion layer is larger than that of Ni/SS304 diffusion
layer. When the welding pressure was 10MPa and the welding temperature was 900℃, copper/304 stainless steel joint
has the best shear strength of 98MPa. Shear fracture morphology shows that copper/304 stainless steel joint has plasticity
and its fracture morphology was dimple, and the copper/stainless steel joint breaks at the middle of the nickel inter-layer
due to its low adhesive strength. The joint strength was limited by the strength of the nickel inter-layer.
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2017, 
