Joining of stainless steel (SS304) and OFE copper by vacuum brazing

Mangla, Vikas; Sharma, Jagmohan; Kumar, Sandeep; Kumar, Pal Dinesh; Agarwal, Arun

doi:10.1016/j.matpr.2020.01.016

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…First, the wettability of an active brazing alloy on the surface of SiO 2f /SiO 2 is poor due to no metallurgical bonding between the active brazing and SiO 2f /SiO 2 . Second, high residual stress is produced in the joint due to the large mismatching degree of the coefficient of thermal expansion (CTE) [ 11 , 12 , 13 , 14 , 15 ]. By resolving the above two problems, a high-quality SiO 2f /SiO 2 -TC4 can be achieved.…”

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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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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“…Since base metals and porous metals are dissimilar materials, an appropriate method must be adopted to create a tight bond to reduce the resistance to heat transfer at their contact [7]. Several techniques have been used to join dissimilar metals [7][8][9][10]. For instance, laser welding could be one of the techniques; however, this technique can result in high energy input to the weld metal when the bond area needs to be narrowed through bonding between base metals and porous metals.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructure and Compressive Strength of Brazing Porous Nickel to Copper and Stainless Steel

Rozaimay,

Tuan Zahari,

Buys

et al. 2023

Acta Metall Slovaca

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This paper investigates the effects of brazing temperatures on the microstructure and compressive strength for brazing porous nickel to copper and stainless steel using VZ2250 as the brazing filler metal. A high vacuum furnace is used to braze the samples. Three different brazing process parameters were set with a heating and cooling rate of 10°C/min, respectively. The characteristics of the joint interface have been investigated to evaluate the performance of the brazed samples by use of scanning electron microscope, energy-dispersive X-Ray spectroscope, X-Ray diffractometer, and Instron Universal Testing machine. The data obtained has been quantitively analyzed to confirm the diffusion of the BFM during the brazing process. It has been found that the diffusion process resulted in an increase in the rigidity of the porous Ni. The compressive strength tests for the brazed joint showed that the maximum compressive strength can be achieved for brazing at 680°C. The highest compressive strength value has been justified by quantitative analysis of the microstructural data. It has been proved that the VZ2250 BFM effectively diffused into the porous Ni at the brazing temperature of 680°C; Cu3P and Cu6Sn5 were detected at the brazed Interface 1, whereas MnNi3 phase at the brazed Interface 2.

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“…The magnetic and nonmagnetic layers can be connected by high temperature treatment, in which the layers are fused together. Hot isostatic pressing (HIP) [16], explosion welding [17], and vacuum brazing [18] have been proposed as potential manufacturing methods. In principle, by using these manufacturing approaches it is possible to achieve the solidity of the rotor similar to the yield strength of the layer materials, because the bonds between the layers can be merged, and as a result, in the best case, the rotor will behave as one solid piece of metal but with a high magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

et al. 2020

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The impact of the thickness of the magnetic and nonmagnetic layers in an axially laminated anisotropic (ALA) rotor in a synchronous reluctance motor (SynRM) aimed at high-speed applications was studied. Considering possible manufacturing issues, the layers are desired to be thick rather than thin. At the same time, the layer thickness is related to the electromagnetic capabilities of the ALASynRM. In the study, a 12 kW ALASynRM was considered. As a reference, a 12 kW IM with a smooth solid rotor with copper end rings was used for comparison with the designed ALASynRM. The manufacturing procedures of an ALA rotor with certain materials were verified in practice. Strength tests of the samples were implemented showing the suitability of the selected materials for application in the prototype. In the electromagnetic design, the thickness of the ALA rotor layers has shown to have a significant impact on the rotor eddy current losses. The stator iron losses and the winding Joule losses also depend on the rotor design. Torque ripple is considerably affected by the thickness of the rotor layers and their position in relation to the stator slots.

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Joining of stainless steel (SS304) and OFE copper by vacuum brazing

Cited by 7 publications

References 1 publication

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

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

Investigation on Microstructure and Compressive Strength of Brazing Porous Nickel to Copper and Stainless Steel

Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

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