Investigation on Surface Condition of the Corona-Aged Silicone Rubber Nanocomposite Adopting Wavelet and LIBS Technique

Neelmani,; Thangabalan, Baskar; Vasa, Nilesh J.; Srinivasan, Balaji; Suematsu, Hisayuki; Sarathi, R.

doi:10.1109/tps.2021.3094124

Cited by 13 publications

(11 citation statements)

References 32 publications

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“…Due to the free migration of LMW molecules, sample S0 recovers faster compared to filled samples. The addition of nano particles restricts the LMW migration and slows down the recovery process [25]. It should be noted, the damage that occurred in an unfilled sample is high, and adding fillers prevent the samples from the damage occurring due to the discharges.…”

Section: Surface Profile Studies Using Afmmentioning

confidence: 99%

Investigation on Electrical, Thermal, and Mechanical Properties of Silicone Rubber ATH Nanocomposites

2022

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In the present study, investigations have been carried out by choosing the nano-sized ATH (30 -50 nm) particles as filler content in silicone rubber to acquire a deep insight to understand the use of nano ATH fillers in silicone rubber on its performance, to use it as insulation structure as an outdoor insulator. Variation in the surface condition of silicone rubber nanocomposites due to corona aging and the recovery characteristics analysis carried out through contact angle measurement. Nano ATH added in silicone rubber, up to 3 wt% of filler, shows increased dielectric constant with less loss factor. Water droplet-initiated discharges on silicone rubber nano ATH composites under DC voltage measured using UHF technique and the damage caused zone analyzed through AFM studies and by surface potential measurement, which indicates higher surface roughness and increased charge trap depth. It is observed that negative DC voltage has higher CIV followed by positive DC and AC voltage. Laser Induced breakdown studies (LIBS) show a direct correlation between plasma temperature and material surface hardness. Also, on laser shining on the surface of the specimen, its temperature was measured on the backside of the specimen through thermal imaging confirming increased diffusivity of temperature. Laser flash analysis shows a direct correlation between filler content in base polymer and thermal conductivity and diffusivity. Higher storage modulus and activation energies measured from the dynamic mechanical analysis indicate the significance of prepared composites as an excellent mechanical support structure for the power system network.

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Section: Surface Profile Studies Using Afmmentioning

confidence: 99%

Investigation on Electrical, Thermal, and Mechanical Properties of Silicone Rubber ATH Nanocomposites

2022

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“…Dominant peaks of the N(I), N(II), O(I), O(II), Si(I), Si(II), C(I), and C(II) elements were observed in both unaged and corona aged silicone rubber nanocomposites. Neelmani et al carried out the elemental mapping of the unaged and corona aged samples and calculated the plasma temperature using the Boltzman-Saha equation [21]. From the analysis, they concluded that the plasma temperature of the samples reduced with corona ageing, and within 8 hours of recovery time, the plasma temperature recovers to its initial value.…”

Section: G Libs Analysis and Elemental Distributionmentioning

confidence: 99%

“…Furthermore, the impact of corona discharge on the surface characteristics of the material, including hydrophobicity and tracking/erosion, are reported using diagnostic procedures including image saturation, digital image processing, and nuclear resonance magnetic detection [19,20]. Neelmani et al investigated the impact of corona discharges on the surface morphology characteristics of the nanocomposites by measuring contact angle, and surface profile measurement using atomic force microscopy (AFM) and characterized the AFM spectra obtained by adopting the multiresolution signal decomposition (MRSD) technique [21]. However, the impact of filler loading and, change in surface morphology due to LMW migration during the corona ageing recovery period, and the elemental distribution behavior of the sample due to corona discharge is scanty This paper reports the results of a study on silicone rubber nanocomposites subjected to corona ageing to elucidate the following important aspects using AFM and LIBS techniques (i) analysis of surface roughness at different ageing periods, (ii) recovery characteristics of silicone rubber nanocomposite at a different time intervals, (iii) analysis of the hydrophobicity loss and recovery behavior by use of contact angle measurement, (iv) analysis of elemental distribution and plasma emission persistence time of silicone rubber alumina nanocomposites under corona discharge using LIBS during the recovery time.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Surface Condition of Silicone Rubber Nanocomposite Due to Corona Aging Using AFM Imaging and LIBS Spectroscopy

Thangabalan

Neelmani

Vasa

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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Silicone rubber insulators undergo degradation when they are exposed to corona discharges. The present study explores the surface degradation behavior of silicone rubber alumina nanocomposites due to corona ageing using highfrequency AC voltage. The electric field distribution on the sample surface during corona ageing is simulated using COMSOL. The change in silicone rubber functional group is studied using Fourier transform infrared spectroscopy (FTIR) analysis. The influence of corona ageing time on the surface roughness recovery of silicone rubber nano alumina composites is studied using an atomic force microscope (AFM). The elemental distribution behavior and change in the emission spectra persistence time are analyzed during recovery period of corona-aged silicone rubber nanocomposites using Laser-Induced Breakdown Spectroscopy (LIBS) technique. The addition of alumina nanofiller to the silicone rubber improves the resistance to ageing due to corona discharge. Loss and recovery of hydrophobic property of silicone rubber due to corona aging were determined using static contact angle measurement. The results show a direct correlation between the contact angle and the surface roughness recovery characteristics. They indicate that the nanocomposite having a 5 wt% alumina content exhibits the highest resistance to corona discharge with least surface damage. Furthermore, fast recovery was observed in the first few hours after corona ageing, and most samples eventually regained their properties after about 8 hours of recovery time.

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“…András et al stated that, after the exposure of SR material to corona discharge, the complete recovery was not observed due to the oxidation on the surface of SR [19]. Recently, the variation in the surface morphology of SR after corona ageing has been investigated by performing 3D surface profile analysis, by using AFM technique [20]. Thus, the hydrophobicity and surface profile variation of SR micronano composites due to gamma ray-irradiation have been investigated in the present work by adopting static contact angle and AFM technique.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Surface Condition of Gamma Irradiated Silicone Rubber Micro-Nanocomposites

et al. 2023

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Silicone rubber (SR) micro nanocomposites formed with micro-ATH and nano-alumina particles have been subjected to different levels of gamma-ray irradiation to understand the characteristic variation in the surface condition of the material through contact angle measurement, Atomic Force Microscopy (AFM) studies, water droplet-initiated corona inception voltage (CIV) measurement and by laser-induced breakdown spectroscopy (LIBS) analysis. It is realized that the recovery rate of silicone rubber micro nanocomposites is less compared with the base SR material. It is observed that, irrespective of the level of irradiation, the contact angle and water droplet initiated CIV of the specimen have shown direct correlation. FTIR analysis clearly indicates variation in methyl group formation on irradiation is less with S2 specimen. It is also observed that fractal dimension calculated by three different techniques for the surface profile data obtained using AFM is in directly in proportion with average surface roughness. In addition, the lacunarity values of the irradiated samples followed the same pattern as that of the average surface roughness. The variation in thermal degradation temperature has been analyzed by adopting thermogravimetric analysis (TGA). The calculated plasma temperature values from laser-induced breakdown spectroscopy and the crater depth formed due to laser ablation have shown inverse relationship. Artificial neural network (ANN) has been employed successfully using LIBS data, to understand the level of irradiation of the SR samples. Overall, the silicone rubber micro-nanocomposite sample S2 filled with micro-ATH and nano Alumina has reflected relatively lesser degradation after being exposed to gamma irradiation, over other test specimens.

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Investigation on Surface Condition of the Corona-Aged Silicone Rubber Nanocomposite Adopting Wavelet and LIBS Technique

Cited by 13 publications

References 32 publications

Investigation on Electrical, Thermal, and Mechanical Properties of Silicone Rubber ATH Nanocomposites

Investigation on Electrical, Thermal, and Mechanical Properties of Silicone Rubber ATH Nanocomposites

Understanding the Surface Condition of Silicone Rubber Nanocomposite Due to Corona Aging Using AFM Imaging and LIBS Spectroscopy

Investigation on the Surface Condition of Gamma Irradiated Silicone Rubber Micro-Nanocomposites

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