High temperature vacuum brazing of tungsten to tungsten alloy with structural material

Singh, K. Premjit; Patel, Alpesh; Bhope, Kedar; Rimza, Sandeep; Mehta, Mayur; Khirwadkar, S.S.

doi:10.1016/j.fusengdes.2023.114058

Cited by 1 publication

(1 citation statement)

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“…As a result, it is very important to realize the high-quality joining of SiO 2f /SiO 2 and TC4. Many studies revealed that brazing is one of the most suitable methods to join ceramic and ceramic matrix composite with metals [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. However, when brazing SiO 2f /SiO 2 composite and TC4, two problems exist.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of “3D-rGO” Buffer Layer on the Microstructure and Properties of SiO2f/SiO2 and TC4 Brazed Joint

Liu,

Ma,

Chen

et al. 2024

Materials

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Brazing a SiO2f/SiO2 composite with metals is often faced with two problems: poor wettability with the brazing alloy and high residual stress in the joint. To overcome these problems, we report a combined method of selective etching and depositing reduced graphene oxide (rGO) on the surface of a SiO2f/SiO2 composite (3D-rGO-SiO2f/SiO2) to assist brazing with TC4. After the combined treatment, a “3D-rGO” buffer layer formed on the surface layer of the SiO2f/SiO2, and the contact angle was reduced from 130° to 38°, which meant the wettability of active brazing alloy on the surface of SiO2f/SiO2 was obviously improved. In addition, the “3D-rGO” buffer layer contributed to fully integrating the brazing alloy and SiO2f/SiO2; then, the infiltration of the brazing alloy into the surface layer of the SiO2f/SiO2 was enhanced and formed the reduced graphene oxide with a pinning structure in the three dimensional (“3D-pinning-rGO”) structure. Moreover, the joining area of the brazing alloy and SiO2f/SiO2 was expanded and the mismatch degree between the SiO2f/SiO2 and TC4 was reduced, which was achieved by the “3D-pinning-rGO” structure. Furthermore, the concentration of the residual stress in the SiO2f/SiO2-TC4 joints transferred from the SiO2f/SiO2 to the braided quartz fibers, and the residual stress reduced from 142 MPa to 85 MPa. Furthermore, the 3D-pinning-rGO layer facilitated the transfer of heat between the substrates during the brazing process. Finally, the shear strength of the SiO2f/SiO2-TC4 joints increased from 12.5 MPa to 43.7 MPa by the selective etching and depositing rGO method.

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