Polarization Processes in Electrotechnical Porcelain Within a Wide Frequency Range

Kolpashchikova, Zh. V.; Shcherbakova, E. V.; Kostyukov, N. S.

doi:10.1023/b:glac.0000020791.58658.04

Cited by 7 publications

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“…During this long period of time, it has been realized that several characteristic properties of porcelain (e.g., mechanical strength, high-power dielectric strength, and corrosion resistance) as a ceramic product cannot be obtained in other materials. Electrical porcelains can be classified as follows based on its purpose and properties [18,19]: i) normal high-voltage porcelains used in the production of high-voltage line and apparatus insulators; ii) high-voltage porcelains with an increased quartz content used to make highvoltage apparatus insulators with improved electromechanical properties; iii) high-voltage alumina porcelains for high-voltage apparatus insulators with elevated mechanical strengths; iv) low-voltage porcelains used in the production of insulators and insulating parts for plants up to 500 V generating direct and alternating current and weak current plants [20]. Today, the growing demand for porcelain in the field of electrical engineering, caused by the importance of electric energy in modern society, motivates many research projects in order to obtain the best properties for the requirements and applications of porcelain insulators [21].…”

Section: (Sinterização E Propriedades Dielétricas De Uma Porcelana Témentioning

confidence: 99%

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

et al. 2016

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In this study, the production of a technical porcelain, for the ceramic dielectric applications by using economical natural raw materials, was investigated. The basic porcelain composition was selected consisting of 30 wt% kaolin, 45 wt% potash-feldspar and 25 wt% quartz. The obtained phases in the sintered samples were investigated by X-ray diffraction, Fourier transform infrared spectroscopy analysis, and scanning electron microscopy images. It has been confirmed by these techniques that the main crystalline phases were quartz and mullite. Dielectric measurements of technical porcelains have been carried out at 1 kHz from room temperature to 200 °C. The dielectric constant, loss factor, dielectric loss tangent, and resistivity of the porcelain sample sintered at 1160 °C were 22-25, 0.32-1.80, 0.006-0.07, and 0.2-9 x 10 13 W.cm, respectively. The value of dielectric constant was significantly high when compared to that of conventional porcelains which did not exceed generally 9. ResumoNeste estudo, foi investigada a produção de uma porcelana técnica para aplicações cerâmicas dielétricas pelo uso de matériasprimas naturais de baixos custos. A composição básica da porcelana foi selecionada consistindo de 30% de caulim, 45% de feldspato potássico e 25% de quartzo. As fases obtidas nas amostras sinterizadas foram investigadas por difração de raios X, espectroscopia no infravermelho com transformada de Fourier e imagens de microscopia eletrônica de varredura. Foi confirmado por estas técnicas que as principais fases cristalinas foram quartzo e mulita. Medidas dielétricas das porcelanas técnicas foram realizadas a 1 kHz entre a temperatura ambiente de 200 °C. A constante dielétrica, fator de perda, tangente de perda dielétrica e resistividade da amostra de porcelana sinterizada a 1160 °C foram 22-25, 0,32-1,80, 0,006-0,07 e 0,2-9 x 10 13 .cm, respectivamente. O valor de constante dielétrica foi significativamente alto quando comparado ao de porcelanas convencionais que geralmente não excede 9. Palavras-chave: porcelana, caulim, feldspato, quartzo, sinterização, propriedades dielétricas.

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Section: (Sinterização E Propriedades Dielétricas De Uma Porcelana Témentioning

confidence: 99%

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

et al. 2016

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“…The material constituents of EP/GF‐X composites suggest that the maximum contribution to electronic polarization is made by the oxygen ion coming from the EP‐128, which has maximum concentration and polarizability in these composites. However, the molecules in EP‐128 form symmetric structures of evenly distributed oxygen ions, suggesting that the polar groups can only rotate within a very narrow range, and consequently, the molecular dipole moment reaches an equilibrium state in a very short time 11,58 . Taken together, this allows us to conclude that the more polar molecules and functional groups present EP/GF‐X composites (i.e., lower values of

υ_{f}

), the higher their polarity will be.…”

Section: Resultsmentioning

confidence: 84%

“…However, the molecules in EP-128 form symmetric structures of evenly distributed oxygen ions, suggesting that the polar groups can only rotate within a very narrow range, and consequently, the molecular dipole moment reaches an equilibrium state in a very short time. 11,58 Taken together, this allows us to conclude that the more polar molecules and functional groups present EP/GF-X composites (i.e., lower values of υ f ), the higher their polarity will be. Also, the more intense the relaxation motions caused by the inherent polarization of the dipoles when subjected to an alternating electric field, the greater the energy loss will be, and consequently, the higher the values of the dielectric loss.…”

Section: Experimental Dielectric Propertiesmentioning

confidence: 78%

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Nsengiyumva,

Zhong,

Chen

et al. 2023

Polymer Composites

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Glass fiber‐reinforced polymer‐matrix (GFRP) composites are used to manufacture devices such as radomes, electrical insulators, and radar‐absorbing structures, many of which are used in applications with strict mechanical and dielectric property requirements. As such, designs and properties of GFRP composite materials should be regularly improved to guarantee their safe operation and meet their constantly evolving application requirements. In this study, glass fiber (GF) particles and epoxy resin 128 (EP‐128) were used to manufacture high‐performance EP/GF‐X composites with GF particle contents ranging from 5% to 40%. An investigation into their mechanical and dielectric properties revealed that EP/GF‐20 composite specimens presented the best mechanical performance with their bending strength and modulus reaching 159.68 MPa and 6521.92 MPa, respectively, and an average dielectric constant of 4.862 within the 10–105 Hz frequency range. A theoretical analysis of the EP/GF‐X composite specimens' dielectric constants using classic dielectric models based on the Lichtenecker, Bruggeman, Jaysundere‐Smith, and Maxwell‐Garnett rule‐of‐mixture equations indicated that the dielectric model based on the Bruggeman rule‐of‐mixture equation provided the dielectric constants closest to the measured values with a maximum deviation of less than −0.321% for EP/GF‐40 composites. This study provides a feasible strategy to control the mechanical and dielectric properties of GFRP composites.Highlights Glass fiber (GF) particles and epoxy 128 (EP‐128) resin were used to manufacture high‐performance glass fiber‐reinforced epoxy (EP/GF‐X) composites. The composite manufacturing process was carefully controlled to ensure uniform distribution and orientation of GF particles in the EP‐128 resin. The mechanical and dielectric properties of the manufactured EP/GF‐X composites were effectively tailored by controlling the content and distribution of GF particles in the EP‐128 resin matrix. The dielectric constants of the EP/GF‐X composites were measured experimentally and predicted using various theoretical dielectric models. The Bruggeman model provided the dielectric constants of the EP/GF‐X composites closest to the measured values.

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Compaction pressure effect on the dielectric, DC and AC conductivity of C-130 porcelain

Csáki,

Al-Shantir,

Vrabec

et al. 2024

Ceramics International

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Polarization Processes in Electrotechnical Porcelain Within a Wide Frequency Range

Cited by 7 publications

References 0 publications

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Compaction pressure effect on the dielectric, DC and AC conductivity of C-130 porcelain

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