Regulating the surface structure of SiO 2f /SiO 2 composite for assisting in brazing with Nb

Ma, Qiang; Li, Zhuo Ran; Chen, Shu‐Lin; Luo, Da Lin; Zhou, Zhi; Lin, Jing; Qi, Jingyao; Feng, Ji

doi:10.1016/j.matlet.2016.06.111

Cited by 12 publications

(2 citation statements)

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“…In addition, when the fracture path exists in the same area, it is difficult to analyze the residual stress of composite/ceramic and metal brazed joints. In order to analyze the residual stress variation better, some researchers always investigated the distribution of residual stress by Finite Element Analysis (FEA) 38 , 39 . In our case, the fracture path is different before and after etching treatment 40 .…”

Section: Resultsmentioning

confidence: 99%

The relation between residual stress, interfacial structure and the joint property in the SiO2f/SiO2-Nb joints

Yang

et al. 2017

Sci Rep

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In order to achieve a high-quality joint between SiO2f/SiO2 and metals, it is necessary to address the poor wettability of SiO2f/SiO2 and the high residual stress in SiO2f/SiO2-Nb joint. Here, we simultaneously realize good wettability and low residual stress in SiO2f/SiO2-Nb joint by combined method of HF etching treatment and Finite Element Analysis (FEA). After etching treatment, the wettability of E-SiO2f/SiO2 was improved, and the residual stress in the joint was decreased. In order to better control the quality of joints, efforts were made to understand the relationship between surface structure of E-SiO2f/SiO2 and residual stress in joint using FEA. Based on the direction of FEA results, a relationship between residual stress, surface structure and joint property in the brazed joints were investigated by experiments. As well the FEA and the brazing test results both realized the high-quality joint of E-SiO2f/SiO2-Nb and the shear strength of the joint reached 61.9 MPa.

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Section: Resultsmentioning

confidence: 99%

The relation between residual stress, interfacial structure and the joint property in the SiO2f/SiO2-Nb joints

Yang

et al. 2017

Sci Rep

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“…Therefore, many researchers researched the residual stress in the joint with the help of finite element simulations (FEMs) [ 25 , 26 , 27 , 28 , 29 ]. Ma et al [ 30 ] regulated the surface structure of SiO 2f /SiO 2 by selective etching to assist with brazing with Nb. They explained that during brazing, the brazing alloy infiltrates SiO 2f /SiO 2 and forms a “3D-pinning” structure in the joint.…”

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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Brazing of SiO2 ceramic

Chen

et al. 2021

Int J Adv Manuf Technol

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Regulating the surface structure of SiO 2f /SiO 2 composite for assisting in brazing with Nb

Cited by 12 publications

References 11 publications

The relation between residual stress, interfacial structure and the joint property in the SiO2f/SiO2-Nb joints

The relation between residual stress, interfacial structure and the joint property in the SiO2f/SiO2-Nb joints

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

Brazing of SiO2 ceramic

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