Abstract
Ti3SiC2 ceramic and copper were successfully vacuum brazed using Ag-Cu-Ti filler and Ag-Cu-Ti filler with copper mesh, respectively. In this study, the effects of copper mesh and brazing parameters on the interface microstructure and mechanical properties of the joints were systematically studied. The results revealed that the typical interfacial microstructure of joint was Ti3SiC2 ceramic/Ti5Si3 + TiC + Ti2Cu + Ti3Cu/Ag (s, s) + Cu (s, s)/eutectic Ag-Cu + TiSiCu/Cu. A maximum shear strength of joint obtained at a brazing temperature of 870 °C and a holding time of 10 min can reached up to 66.3 ± 1.2 MPa, which was 34.7% higher than that without copper mesh. The improvement of mechanical property was attributed to the extraordinary plasticity of copper mesh, which reduced the residual stress caused by the difference in the coefficient of thermal expansion at the interface of joints. As the brazing temperature and holding time further increased, the shear strength of joints decreased due to the excessively thick reaction layer of intermetallic compounds.
Highlights
Compared with other metals or alloys, pure copper is usually joined with Ti3 SiC2 ceramic to form composite components in the field of electrical conductivity and wear resistance due to its excellent conductivity, high fracture toughness, and good workability [4,5]
In order to relieve the concentration of residual stress and promote the strength and toughness of brazed joint, several methods have been introduced to the brazing of ceramics and metals, including composite fillers [25,26,27], surface processing [28,29,30], metal foil interlayer [31,32,33,34], mesh metal [35,36,37,38], and so on
Ag and Cucopper atoms diffused to Ti3SiCa2 large ceramic side. of Cu the erosion of pure copper and mesh generated amount atoms theenriched interface.inIn addition, the intermetallic compounds formed by the interfacial
Summary
In order to relieve the concentration of residual stress and promote the strength and toughness of brazed joint, several methods have been introduced to the brazing of ceramics and metals, including composite fillers [25,26,27], surface processing [28,29,30], metal foil interlayer [31,32,33,34], mesh metal [35,36,37,38], and so on. There are a few reports on the release of residual stress in Ti3 SiC2 ceramic/copper brazed joints, especially the metal mesh method. The effects of brazing parameters and copper mesh on interfacial microstructure and mechanical properties of joints were surveyed and discussed
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