Mechanical and Electrical Characterization of Carbon Fiber/Bucky Paper/Zinc Oxide Hybrid Composites

Ayyagari, Suma; Al-Haik, Marwan; Rollin, Virginie

doi:10.3390/c4010006

Cited by 9 publications

(10 citation statements)

References 52 publications

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“…The influence of sintering temperature was generally not considered until now, with most varistor manufacturers taking constant values of approx. 1200-1300 degrees Celsius for sintering, values taken from the usual ceramics area, applied as such and for semiconductor ceramics [23].…”

Section: New Research About the Sintering Temperature Of Varistor Matmentioning

confidence: 99%

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New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process

et al. 2019

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At the beginning, this article details the manufacturing procedures for varistor materials. Starting from the initial composition of two large series of varistors (those with two additive oxides and those with five additive oxides), there is a major overview of the main stages of the technological process and the equipment used for the production, emphasizing the technological changes that were made. The article continues with the study of the influence of the sintering pressure and the sintering temperature on the electrical properties of the varistor materials made before. There were two experimental series of 7 varistors, one series based on 2 additive oxides and one based on 5 additive oxides. Each varistor of these series was sintered at another temperature, the fundamental purpose being to determine an optimal sintering temperature for each chemical composition. A second activity consisted of manufacturing two more series of varistors with the same chemical composition (2 oxides and 5 additive oxides), which were sintered at two different pressures, for having a set of conclusions on the influence of sintering pressure on the electric performances. All conclusions are underlying a new process for manufacturing metal oxide based varistors.

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Section: New Research About the Sintering Temperature Of Varistor Matmentioning

confidence: 99%

“…The problem of mass losses (through the decomposition and vaporization of some components) remains an important aspect for the metal oxide based varistor manufacturing technology, especially when manufactured on higher temperatures [23].…”

Section: Mass Lossesmentioning

confidence: 99%

New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process

et al. 2019

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“…The measurements shall be made at a voltage U = 460 V, which corresponds to the operating coefficients at the stationary thermal stability limit [21]:  C = 0.821 for R, and,  C = 0.83 for S,…”

Section: Analysis Of Permanent Service Regime For a Single Varistormentioning

confidence: 99%

“…The measurements shall be made at a voltage U = 460 V, which corresponds to the operating coefficients at the stationary thermal stability limit [21]: where, C = U/U N , the ratio between the applied and the nominal voltage. Following the measurements made, the values of the stationary currents were determined as:…”

Section: Analysis Of Permanent Service Regime For a Single Varistormentioning

confidence: 99%

Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling

et al. 2019

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Metal oxide varistors are applied today inside modern surge arresters for overvoltage protection for all voltage levels. Their main issue is the thermal activation of their crossing current, which could lead to complete destruction by thermal runaway. This article presents a new technological solution developed in order to increase the thermal stability of metal oxide varistors. It consists in connecting in parallel two or more similar varistors (for dividing their current), having a thermal coupling between them (for equalizing their temperatures and forcing them to act together and simultaneously as much as possible). Starting from a finite element computer model performed for each situation (varistor standalone or parallel), up to real measurements, the thermal stability of the equipment was analyzed in permanent and impulse regime. Experiments were carried out in the same conditions. Experimental data obtain from two disk varistors corresponds very well to simulations, proving that parallel connection of varistors, combined with a thermal exchange between them is an efficient technical solution for thermal stability improvement, even if not apparently economically justified.

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“…This investigation focuses on revealing the changes in the dynamic mechanical properties and activation energy of a woven CFRP as consequences of adding CNTs and ZnO nanofillers, individually or combined, at the interface of The CFRPs. In our previous work [47], the addition of Bucky paper and ZnO nanorods was studied. The planar orientation of CNTs in Bucky paper resulted in a weak adhesion to the epoxy matrix at the interface.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Viscoelastic Performance of Carbon Fiber Composites by Incorporating CNTs and ZnO Nanofillers

Ayyagari

Al-Haik

2019

Applied Sciences

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Carbon fiber reinforced plastic composites (CFRPs) possess superior elastic mechanical properties. However, CFRPs lack sufficient viscoelastic performance, such as damping and creep resistance. In an effort to improve these properties, in this study, hybrid multiscale composites with various combinations of zinc oxide nanorods (ZnO) and carbon nanotubes (CNTs) were deposited at the interface of carbon fiber laminae. The viscoelastic properties of the corresponding composites were characterized via dynamic mechanical analysis (DMA) during both temperature and frequency sweeps. The creep activation energy for each composite configuration was also calculated. The DMA temperature sweep analysis reported that the composite incorporating both ZnO and CNTs exhibited the highest improvements in all viscoelastic properties. This composite also attained better creep resistance, evident by the highest activation energy. The DMA frequency sweep analysis revealed that composites incorporating a single nanofiller improves the viscoelastic properties more than the combined nanofiller composite. Despite these improvements in the viscoelastic properties, the non-uniform dispersion and agglomerations of the nanofillers affected some of the elastic properties negatively, such as the storage modulus.

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Mechanical and Electrical Characterization of Carbon Fiber/Bucky Paper/Zinc Oxide Hybrid Composites

Cited by 9 publications

References 52 publications

New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process

New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process

Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling

Enhancing the Viscoelastic Performance of Carbon Fiber Composites by Incorporating CNTs and ZnO Nanofillers

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