Microstructure and Properties of Si3N4 Ceramics and 304 Stainless Steel Brazed Joint with Cu/Ag-Cu/Ti Laminated Filler Metal

Abstract

Si3N4 ceramics and 304 stainless steel were joined by the Cu/Ag-Cu/Ti laminated filler metal. Interfacial microstructure of brazed joint and effect of brazing temperature and thickness of Cu foil on mechanical properties were studied in this paper. Research results showed that the interfacial microstructure of the brazed joint might be 304 stainless steel/TiFe2/Ag-Cu eutectic+Cu(s,s)/Cu(s,s)/Cu(s,s)+Ag-Cu eutectic/Cu3Ti+TiN/Si3N4 ceramics. With the increasing of the brazing temperature, four-point bending strength of the brazed joint initially increased, then decreased. The bending strength reached the maximum value of 53 MPa at 1153 K when the thickness of Cu foil was 500 μm. The bending strength reached the maximum value of 57 MPa with 1 mm thickness Cu interlayer under the brazing temperature of 1153 K.

Effect of Mo and W interlayers on microstructure and mechanical properties of Si3N4–nickel‐base superalloy joints

“…Si 3 N 4 has been joined to steel, 7,8 aluminides, 3 tungsten (W), titanium (Ti), and niobium (Nb), 9,10 Ni‐base superalloys, 11–15 and other substrates using either direct bonding or in combinations of metal interlayers 16–18 . For example, multilayered Si 3 N 4 /steel joints have been brazed using AgCuTi brazes in conjunction with 2–4 mm thick Ni/W/Ni interlayers for applications such as turbocharger rotors with a Si 3 N 4 disc brazed to a steel shaft 1 …”

Micromorphology change and microstructure of Cu-P based amorphous filler during heating process

“…Studying amorphous brazing solders, Rabinkin et al of U.S. United Signal Corporation have found that little eutectic exists in the central area of the brazed joint of an amorphous brazing filler metal, and only a small amount of discontinuous chromium-boron compound exists at the interface with the base metal. Therefore, the strength of the brazed joint is high [15][16][17].…”

Effect of Brazing Temperature on the Microstructure and Chosen Properties of WC–10Ni/NiCrBSi Composite Coatings Produced by Vacuum Cladding from Flexible Coated Cloths

“…Owing to uneven heating in the welding process, the temperature gradient in the surfacing welding process is large, leading to high welding stress, deformation, and even cracking. The strengthening thickness of gas-phase deposition coatings is relatively thin [2][3][4][5][6][7][8][9][10][11][12].…”