Development of a new epoxy resin for superconducting magnet impregnation

Baldan, C.A.; Shigue, C.Y.; Filho, Ernesto Ruppert

doi:10.1109/77.828486

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…The thermal shrinkage rate of insulation tube wounded by glass fiber filament in radial direction is lower than that using glass fiber tape. Additional areas, including mechanical properties at cryogenic temperature, thermal conductivity, dielectric property and anti-radiation properties of the cryogenic temperature resistant glass fiber reinforced epoxy resin composites for superconducting Tokamak (Huang et al 2014 ; Kumosa et al 2005a , b ; Baldan et al 2000 ; Hikita et al 2011 ), need to be investigated further. …”

Section: Conclusion and Discussionmentioning

confidence: 99%

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

Wang

et al. 2016

SpringerPlus

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The glass fiber reinforced epoxy resin composites play an important role in superconducting Tokamak, which are used to insulate the metal components, such as superconducting winding, cooling pipes, metal electrodes and so on. For the components made of metal and glass fiber reinforced epoxy resin composites, thermal shrinkage leads to non-ignorable thermal stress, therefore, much attention should be paid on the thermal shrinkage rate of glass fiber reinforced epoxy resin composites. The structural design of glass fiber reinforced epoxy resin composites should aim at reducing thermal stress. In this paper, the density, glass fiber content and thermal shrinkage rate of five insulation tubes were tested. The testing results will be applied in structural design and mechanical analysis of isolators for superconducting Tokamak.

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Section: Conclusion and Discussionmentioning

confidence: 99%

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

Wang

et al. 2016

SpringerPlus

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“…In order to more directly reflect the influence of different active products on the thermal stability and pyrolysis process of epoxy resin, the total molecular number of the simulation models in the simulation process was normalized. The normalization function of the total molecular number in the model is defined as N, the total atomic number in the model is defined as N a , and the total molecular number is defined as N m , normalize according to Equation (2).…”

Section: Analysis Of Thermal Stability and Pyrolysis Degreementioning

confidence: 99%

“…Under the joint action of high-energy charged particle bombardment and heat generated by transient electric field change, the temperature of microlocal area on the surface of insulation material with PD will rise suddenly, even to 1000 C in a very short time, which will cause thermal pyrolysis of the material and enhance the corrosion effect of active products. 2,[16][17][18] In the ReaxFF, appropriately increasing the simulation temperature to shorten the reaction time basically does not affect the reaction path and the final product. 11,19 Therefore, the chemical reaction speed can be accelerated by increasing the reaction temperature to shorten the simulation time.…”

Section: Simulation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Moreover, because of the reduction of two methyl groups in the main chain of DGEBF, which has smaller rotational resistance and more intentional flexibility at low temperatures, it is widely used as an insulating material for cryogenic devices. 2 The terminal insulation and current lead insulation of the superconductive power device are in the position of transition from low temperature to high temperature, where the insulation material is subject to the combined action of a large temperature gradient and a high electric field. It has been shown that the larger the temperature gradient, the lower the partial discharge starting voltage (PDIV), and the higher the electric field intensity, the more intense the partial discharge (PD) behavior.…”

Section: Introductionmentioning

confidence: 99%

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Reactive molecular dynamics simulation on the pyrolysis characteristics of epoxy resin under the effect of partial discharge active products

Xing

Chi

Xiao

2020

High Performance Polymers

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Aromatic amine cured Bisphenol F epoxy resin is used as a pivotal solid insulation material in electrical equipment at low temperature and extreme environment. Partial discharge (PD) can lead to an increase in local temperature, which leads to pyrolysis, and the existence of PD active products will aggravate the pyrolysis process of insulating materials. In order to investigate the effect of PD active products on the pyrolysis characteristics of aromatic amine cured epoxy resin, the pyrolysis process of epoxy resin under partial discharge active products is simulated based on ReaxFF. The types and changing trend of small molecular products and the mechanism of PD active products acting on the pyrolysis process of epoxy resin are analyzed. The results show that the oxidation of hydroxyl and C-N bridge bonds by PD active products is the main reason for accelerating the pyrolysis of epoxy resin, which changes the main pyrolysis path of epoxy resin cross-linked structure. The thermal stability of cross-linked epoxy resin decreases under the action of active products, and the types and change trend of small molecular products generated in the pyrolysis process also changes greatly with the change of pyrolysis path.

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Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone

Xing,

Wang,

Wang

et al. 2023

High Voltage

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Bisphenol F epoxy resin (EP) is often used in terminal current lead insulation of superconducting equipment because of its good insulation performance, high mechanical strength, good toughness at cryogenic temperatures, and resistance to cold shock and heat shock. However, due to the wide temperature range of 80–300 K and the strong electric field, the EP‐N2 interface is prone to surface flashover, resulting in terminal insulation failure. To improve the reliability of the current lead insulation, non‐linear conductive EP/strontium titanate (SrTiO3) composites were prepared by modification with nano filling. The changes of dielectric, surface discharge, flashover, and trap distribution characteristics of composite materials were studied, and the mechanism of SrTiO3 on the surface flashover of composite materials was analysed. The results show that the conductivity of the composite increases with the rise of SrTiO3 filling content, and the amplitude of improvement is greater under the strong electric field, showing a more significant non‐linearity. The composite has a lower trap energy level and a greater number of shallow traps compared to pure EP, which accelerates surface charge de‐trapping and reduces charge accumulation, effectively enhancing the discharge and surface flashover voltage of the composite.

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Development of a new epoxy resin for superconducting magnet impregnation

Cited by 7 publications

References 2 publications

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

Reactive molecular dynamics simulation on the pyrolysis characteristics of epoxy resin under the effect of partial discharge active products

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone

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Development of a new epoxy resin for superconducting magnet impregnation

Cited by 7 publications

References 2 publications

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

Reactive molecular dynamics simulation on the pyrolysis characteristics of epoxy resin under the effect of partial discharge active products

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO3 composites in 80–300 K temperature zone

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Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone