Microstructure and mechanical properties of the Si3N4/42CrMo steel joints brazed with Ag–Cu–Ti+Mo composite filler

Microstructure and mechanical properties of Si3N4/42CrMo joints brazed with TiNp modified active filler

“…observed in the Ag-Cu-Tiþ 5 vol%TiNp system at this high magnification. Other investigations showed that with the addition of carbon fiber, Mo, Si 3 N 4 or Al 2 O 3 in the Ag-Cu-Ti filler alloy [5,12,17,18], the active elements Ti could react with all these particles, even with low content, to form brittle compounds at the brazing temperatures, making it difficult to control the microstructure and to analyze related formation mechanism. On the contrary, the interaction between TiN and Ti was relatively weaker compared with the above additions, accompanied by dramatically reduced brittle compounds in the joint.…”

“…When the TiNp content was increased to 30 vol% the bending strength approached zero. High three-point bending strength (587.3 MPa) of Si 3 N 4 /42CrMo joints have been obtained by He et al using Mo modified composite filler [12]. However, as the strength of the butt joints was measured by a four-point bending test in this study, the joints were exposed to a pure bending load with a constant bending moment between the inner pads, avoiding problems associated with strain concentrations that would arise, for example, under the middle loading point in three-point bending.…”

“…SiCp was also incorporated into Ag-Cu-Ti brazing alloy for joining Si 3 N 4 ceramics and the maximal bending strength of 506.3 MPa was obtained with addition of 5 vol% SiCp [11]. Ag-Cu-Tiþ Mo composite filler was also used to join Si 3 N 4 ceramic to 42CrMo steel, and the maximal bending strength of 587.3 MPa was fourfold higher than that of joints without Mo additions [12].…”

Microstructures and mechanical properties of Cf/LAS composite and Ti60 alloy joints brazed with TiZrNiCu + Cf mixed powders

“…Unlike the use of conventional brazing, the composite brazing alloy reduces the mismatch in the CTE between the composite material and the brazing alloy by adding low CTE material into the conventional active brazing alloy. Recently, these composite brazing alloys have attracted widespread attentions on the connection of dissimilar materials . Song et al joined C/C composites to Ti‐6Al‐4V successfully using graphene nanoplatelets reinforced TiZrNiCu brazing alloy.…”

Interfacial microstructure and strengthening mechanism of BN-doped metal brazed Ti/SiO2-BN joints

“…Extensive researches suggested the addition of low CTE materials (fibers or particles) into brazing alloys to improve the strength of a ceramic-metal joint. 24,25 Additionally, it was reported that the in situ synthesized reinforcements originated from brazing process have outstanding reinforcing effects due to their fine size, uniform distribution, and favorable cohesion with the matrix. [26][27][28][29] Song et al 27 reported that the formation of TiN and Ti 5 Si 3 particles in the brazing seam by introducing 3 wt.% Si 3 N 4 particles into Ag-Cu-Ti brazing alloy led to 85% improvement in the shear strength of the TiAl/Si 3 N 4 joints.…”