Microstructural investigation of in situ TiB whiskers array reinforced ZrB2–SiC joint

Brazing of ZrB2–SiC–C ceramic and GH99 superalloy to form reticular seam with low residual stress

“…Due to the inaccuracy of EDS analysis of light elements, B and C elements are not presented in the table. At the ZSC side, combining the EDS results with prior results [19,33,34], it can be inferred that, a Zr 2 Si layer (point A) and a thin Ti 3 SiC 2 layer (point B) form on the ceramic surface. The bulk of the braze seam has eutectic structure, which consists of Ag-rich solid solution (denoted as Ag (s, s) for convenience) (point C) and Cu-rich solid solution (denoted as Cu(s, s) for convenience) (point D).…”

“…Pd-base filler alloy (Palco and Palni) [3], Ni-base filler alloy (MBF20 and MBF30) [18], Ag-Cu-Ti filler alloy [19] pure metal foil interlayers (Ni and Ti/Ni) [20,21] have been utilized as filler materials to braze ZrB 2 base ceramics to themselves. The formation of pores and microcracks in joints is a common problem.…”

“…The use of conventional ductile Ag-Cu-Ti filler alloy to join ZrB 2 base ceramics [19], and the insertion of a soft metal foil like Cu between matrix materials as a ductile interlayer have previously been demonstrated [28][29][30]. Nevertheless, the original ductile brazes seam can be hardened by the brittle compounds generated by excessive interfacial reactions, which could hinder the residual stress relief and is unfavorable for the brazed joint [31,32].…”

Strong and tough ZrB2 materials using a heterogeneous ceramic–metal layered architecture

“…Ti was chosen as the interlayer due to its relatively high melting point, good ductility, and good wettability with ZrB 2 ceramics. TiB 2 and TiB w can be formed by in situ reaction between Ti and B elements . On the one hand, the relatively high modulus of TiB 2 generated at the interface improves the strength of the materials, whereas the generation of TiB w at the interface can effectively resist crack propagation and improve fracture toughness.…”

Effects of brazing temperature on microstructure and mechanical performance of Al2O3/AgCuTi/Fe–Ni–Co brazed joints

“…Nanoindentation method is introduced for probing the mechanical properties of reaction phases of Si 3 N 4 /AgCuTi/ SiCeSi 3 N 4 joint and the digital image correlation (DIC) technique is applied to clarified the strengthening mechanism of the joint [4]. The ZrB 2 eSiC composites (ZS) are also joined using an AgeCu/Ti filler alloy [5], and the result shows that the mechanical properties of ZS/ZS joint are improved by interfacial TiB accommodation due to the reduction of the coefficient of CTE mismatch. For Al 2 O 3 / AgePdeTi/Kovar joint [6], the effect of Ti content on the interfacial microstructure and mechanical properties shows that the type of titanium oxide are affected by the thickness of Ti layer, and the joint strength are influenced by the thickness of reaction layer and residual Ti layer.…”