Effect of brazing temperature on microstructure and mechanical properties of TiAl/ZrB2 joint brazed with CuTiZrNi filler

Wang, Gang; Yang, Yong; Wu, Peng; Shu, Da; Zhu, Dongdong; Tan, Caiwang; Cao, Wei

doi:10.1016/j.jmapro.2019.09.001

Cited by 17 publications

(3 citation statements)

References 43 publications

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“…When the concentration of Ti elements reaches the critical concentration for the interfacial reaction, at the SiC ceramic side, a reaction of 5Ti + 3Si → Ti 5 Si 3 occurs due to the lowest Gibbs free energy of Ti 5 Si 3 [30]. The negative Gibbs free energy of TiC induces the reaction of Ti and C in the composite filler to produce TiC by Ti + C → TiC [31]. At this stage, the Ti elements are combined with SiC to form the TiC interfacial barrier layer [32], which hinders the interfacial reaction between the AgCuTi active filler and LAS.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Shear Strength of SiC Joint Brazed with LiAlSiO4 Reinforced AgCuTi Composite Filler

Jian

Wang

et al. 2023

Metals

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In this work, SiC ceramics were successfully brazed at 900 °C using a composite brazing filler, and the effects of holding time and LiAlSiO4 addition on the interfacial microstructure and mechanical properties of the joints were systematically investigated. The results showed that the brazed joints were devoid of obvious defects, and the joint structure was mainly composed of SiC/Ti5Si3/TiC + TiCu2 + TiO2 + LAS + LiAlSi2O6 + Cu (s, s) + Ag (s, s)/Ti5Si3/TiC/SiC. When the brazing temperature was 900 °C for 10 min and the LiAlSiO4 addition was 1 wt%, the SiC brazed joints reached a maximum shear strength of 106.47 MPa, which was 4.7 times higher than that of the joints without LiAlSiO4 addition under the same conditions. According to theoretical calculations, the addition of LAS can successfully reduce residual stresses in SiC brazed joints and enhance the joint strength.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Shear Strength of SiC Joint Brazed with LiAlSiO4 Reinforced AgCuTi Composite Filler

Jian

Wang

et al. 2023

Metals

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“…Many methods, such as adhesive joining, 4 solid‐state bonding, 5 and brazing, 6‐9 have been developed for joining ceramics to itself or metals (alloys). Among these methods, brazing is suitable to obtain reliable ceramics/ceramics (or metal) metallurgical joints due to its simplicity, convenience, low cost, and high joint strength 10‐12 …”

Section: Introductionmentioning

confidence: 99%

Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal

Chen

Song

et al. 2020

Int J Applied Ceramic Tech

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In this work, chromium coating conducted by magnetron sputtering was introduced to braze SiC ceramics using inactive AgCu filler metal. The results showed that reliable metallurgical bonding of SiC ceramics was obtained at 900°C for 10 minutes. SEM, XRD, and TEM were used to identify the reaction phase in the joint, and the typical interfacial microstructure was SiC/mixed CrSi 2 + Cr 23 C 6 layer/CrSi 2 / Ag(s,s)+Cu(s,s)/CrSi 2 /mixed CrSi 2 + Cr 23 C 6 layer/SiC. The shear strength of SiC joint using chromium coating brazed with inactive AgCu filler metal was 29.6 MPa and the joint fractured at the SiC substrate entirely after shear test. The proposed active element coating method provides a feasible way to achieve the brazing of ceramics.

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“…[7,8] Brazes, such as AgCuTi, AgCuInTi, NiCrPCu, and amorphous TiZrNiCu, have been selected to join graphite and metal. [9][10][11][12] Zhang et al [9] prepared graphite and Cu joints by brazing with graphene nanosheet-reinforced AgCuTibased composites; compared with pure AgCuTi interlayers, the shear strength of the graphite and Cu joints increased by 75% when a graphene nanosheet-reinforced AgCuTi-based composite interlayer was used. Among them, CuTi system active fillers have been widely used.…”

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Microstructure and Performance of Graphite/Copper Joints by Brazing with Different Interfacial Structures

et al. 2021

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Graphite is expected to be used for plasma-facing materials in fusion applications due to its low density, good wear resistance, and superior thermomechanical properties. [1,2] To dissipate heat in a radiation environment, it is often required to be joined to a metal, such as copper, which has high thermal conductivity. [3,4] Reliable joining technologies, such as brazing, diffusion bonding, and transient liquid phase joining, are essential for the preparation of graphite to copper joints. Among them, brazing is one of the most popular methods. During brazing, the filler metal with good plastic deformation can relieve the residual stress caused by the mismatched expansion coefficient of base metal. [5,6] The wettability of metal on the graphite surface is a critical problem during the brazing process. The poor wettability of graphite has been partly improved by surface modification of graphite and by adding the active element Ti or Cr to the brazes, which has a strong affinity to carbon. [7,8] Brazes, such as AgCuTi, AgCuInTi, NiCrPCu, and amorphous TiZrNiCu, have been selected to join graphite and metal. [9][10][11][12] Zhang et al. [9] prepared graphite and Cu joints by brazing with graphene nanosheet-reinforced AgCuTibased composites; compared with pure AgCuTi interlayers, the shear strength of the graphite and Cu joints increased by 75% when a graphene nanosheet-reinforced AgCuTi-based composite interlayer was used. Among them, CuTi system active fillers have been widely used. TiH 2 took the place of Ti in the active filler due to the easy oxidation of pure Ti powders. Mao et al. [13] successfully brazed carbon materials to copper with Cu50TiH 2 -based fillers (including Cu50TiH 2 filler and Cu50TiH 2 þ C composite filler) at 1223 K and the average shear strength was 10.8 MPa. The braze filler with active elements can effectively enhance the wettability of graphite, to produce better metallurgical bonding between copper and graphite.Moreover, the large thermal residual stresses caused mainly by the coefficient of thermal expansion mismatch between the two materials exist in the graphite/copper joint, which leads to a strong tendency to crack or even fracture during cooling down from the joining temperature. [14] To release the residual thermal stress of the joint, soft metal foil and a special surface structure were used by means of micromachining. Zhang et al. [15] investigated the interfacial shape effect on the mechanical properties of the joint between carbon-fiber-reinforced carbon composite and copper. The average joint strength of the conical interface improves 3.7 times over the common straight interface brazing joint. Shen et al. [16] obtained conical holes on C/C composites by laser micromachining, and the surface treated with TiH 2 power by the slurry technique was brazed to CuCrZr alloys with Cu-3.5Si brazes. These results suggest that the introduction of the interfacial structure can relieve the joint stress and improve the joint strength.In this study, straight and zigzag interfacial structures ...

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Effect of brazing temperature on microstructure and mechanical properties of TiAl/ZrB2 joint brazed with CuTiZrNi filler

Cited by 17 publications

References 43 publications

Microstructure and Shear Strength of SiC Joint Brazed with LiAlSiO4 Reinforced AgCuTi Composite Filler

Microstructure and Shear Strength of SiC Joint Brazed with LiAlSiO4 Reinforced AgCuTi Composite Filler

Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal

Microstructure and Performance of Graphite/Copper Joints by Brazing with Different Interfacial Structures

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