Resistance against AC corona discharge of micro-ATH/ nano-Al2O3 co-filled silicone rubber composites

Nazir, M. Tariq; Phung, B.T.; Yu, Shihu; Li, Shengtao

doi:10.1109/tdei.2018.006914

Cited by 59 publications

(39 citation statements)

References 37 publications

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“…(i) The embedded water molecules (and/or hydrated ions) would spill over in the drying process, its meant that the amount of the hydrophilic content on the surface decrease, according to Cassie's law, this process was a benefit for the recovery of hydrophobicity. (ii) The increase in the fractal dimension as well as the roughness at different analytical resolution could be expected after liquids immersion and subsequent drying, when taking into consideration the LMW diffusion from bulk to surface in the drying process, the surface with increasing of roughness and fractal dimension covered by the LMW would increase the hydrophobicity; moreover, the crack of HTV silicone rubber surface can also provide lower resistance route to LMW to reach on the surface the sample from bulk [33, 34], this was also benefit for the increase in hydrophobicity. In short, the synergy of LMW diffusion and increase in roughness/fractal dimension improved the hydrophobicity of HTV silicone rubber during the drying process.…”

Section: Discussionmentioning

confidence: 99%

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Gao¹,

Liang

Bao

et al. 2019

High Voltage

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High-temperature vulcanised (HTV) silicone rubber composite insulator has been widely used in extra-high and ultrahigh transmission lines due to its excellent electrical and mechanical performance. In practice use, liquids may encounter the composite insulator intermittently and can lead to the degradation and deterioration of silicone rubber. In the present research, the effects of liquids immersion and subsequent drying on the surface properties of HTV silicone rubber were investigated by means of the contact angle measurement and surface physical morphology measurement which was further analysed in terms of the discrete wavelet transform method, multiresolution signal decomposition algorithm, and three-dimensional fractal dimension calculation. Based on the experimental results, the mechanism of the loss and recovery of the hydrophobicity of HTV silicone rubber surface during the liquids immersion and subsequent drying processes were further explained by taking into consideration the embedded water molecules (and/or hydrated ions) on the HTV silicone rubber surface and the synergy of the increase in roughness/fractal dimension and low molecular weight siloxanes diffusion. This study is helpful for better understanding of the change of surface properties of HTV silicone rubber caused by environmental and electrical stresses.

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Section: Discussionmentioning

confidence: 99%

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Gao¹,

Liang

Bao

et al. 2019

High Voltage

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“…The curing was carried out according to the methodology described in [25][26][27][28][29] and samples of thin rectangular plate shape of dimension 100 × 100 × 3 mm 3 were casted for UV weathering testing. As shown in Table 1, four different types of samples were fabricated in this study and for ease of referencing; they were denoted as U-SR, M-SR, MN-SR, and N-SR. To improve the erosion performance, micron-sized particles were added by 40-60 wt% to SR [30]. Samples with particles loading up to 30 wt% (micro) and 5 wt% (nano) could be made but the available mixing facility was not able to handle loading beyond this limit.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…As shown in Table 1, four different types of samples were fabricated in this study and for ease of referencing; they were denoted as U‐SR, M‐SR, MN‐SR, and N‐SR. To improve the erosion performance, micron‐sized particles were added by 40–60 wt% to SR [30]. Samples with particles loading up to 30 wt% (micro) and 5 wt% (nano) could be made but the available mixing facility was not able to handle loading beyond this limit.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Accelerated ultraviolet weathering investigation on micro‐/nano‐SiO ₂ filled silicone rubber composites

Nazir

Phung

2018

High Voltage

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This study attempts to elucidate whether the addition of micro and/or nano-silica (SiO 2) particles can enhance the resistance of pure polydimethylsiloxane against synergistic effects of UV, temperature and high-voltage stress. Four types of composites (U-SR, M-SR, MN-SR and N-SR) are fabricated by adding micro and/or nano-silica particles and then subjected to multi-stress degradation in a test chamber. Results show that there is an apparent surface discoloration in the form of yellowish pale tint and a significant resistance to hydrophobicity reduction is offered by N-SR and MN-SR followed by M-SR and U-SR. Scanning electron microscopy and surface roughness findings proclaimed that N-SR and MN-SR offer excellent resistance against filler exposure and an increase in surface roughness. There is a minor reduction in absorbance level of Si (CH 3) 2 and Si-O-Si functional groups of composites but interestingly, hydrophilic hydroxyl group absorbance level is found higher in the U-SR comparatively. Furthermore, dielectric response measurements indicate considerable sensitivity to weathering with N-SR and MN-SR giving the lowest dielectric loss. Results indicate that the addition of nano-silica to pure and micro-silica filled SR can enhance its UV weathering resistance considerably by building an effective UV shielding layer.

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“…[16][17][18] The addition of co-filled filler in the matrix which can combine the advantages of different fillers respectively is another effective approach to improve the overall performances of polymer. [19][20][21] Zha et al prepared silicone rubber co-filled with different volume ratios of micro-Si 3 N 4 and nano-Al 2 O 3 , they found that the thermal conductivity reached 1.6 W m −1 K −1 when the volume fraction of Si 3 N 4 was 26%, volume fraction of Al 2 O 3 is 4%. [22,23] Permittivity-graded epoxy composites co-filled with TiO 2 particles and SiO 2 particles were proposed by Kurimoto et al to reduce the coefficient of thermal expansion.…”

Section: Introductionmentioning

confidence: 99%

Thermal, electrical, and mechanical properties of addition‐type liquid silicone rubber co‐filled with Al₂O₃ particles and BN sheets

Feng

Zhang

Zha

et al. 2020

J of Applied Polymer Sci

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The addition‐type liquid silicone rubber (ALSR) co‐filled with spheroidal Al2O3 and flaky BN was prepared by the mechanical blending and hot press methods to enhance the thermal, electrical, and mechanical properties for industrial applications. Morphologies of ALSR composites were observed by scanning electron microscopy (SEM). It was found that the interaction and dispersion state of fillers in the ALSR matrix were improved by the introduction of BN sheets. Thermal, electrical, and mechanical performances of the ALSR composites were also investigated in this work. The result indicated that the thermal conductivity of ALSR can reach 0.64 W m−1 K−1 at the loading of 20 wt% Al2O3/20 wt% BN, which is 3.76 times higher than that of pure ALSR. The addition of Al2O3 particles and BN sheets also improve the thermal stability of ALSR composites. Moreover, pure ALSR and ALSR composites showed relatively lower dielectric permittivity (1.9–3.1) and dielectric loss factor (<0.001) at the frequency of 103 Hz. The insulation properties including volume resistivity and breakdown strength were improved by the introduction of flaky BN in the ALSR matrix. The volume resistivity and characteristic breakdown strength E0 are 6.68 × 1015 Ω m and 93 kV/mm, respectively, at the loading of 20 wt% Al2O3/20 wt% BN. In addition, the mechanical characteristics including elongation at break and tensile strength of ALSR composites were also enhanced by co‐filled fillers. The combination of these improved performances makes the co‐filled ALSR composites attractive in the field of electrical and electronic applications.

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Resistance against AC corona discharge of micro-ATH/ nano-Al2O3 co-filled silicone rubber composites

Cited by 59 publications

References 37 publications

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Accelerated ultraviolet weathering investigation on micro‐/nano‐SiO ₂ filled silicone rubber composites

Thermal, electrical, and mechanical properties of addition‐type liquid silicone rubber co‐filled with Al₂O₃ particles and BN sheets

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Resistance against AC corona discharge of micro-ATH/ nano-Al2O3 co-filled silicone rubber composites

Cited by 59 publications

References 37 publications

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

Accelerated ultraviolet weathering investigation on micro‐/nano‐SiO 2 filled silicone rubber composites

Thermal, electrical, and mechanical properties of addition‐type liquid silicone rubber co‐filled with Al2O3 particles and BN sheets

Contact Info

Product

Resources

About

Accelerated ultraviolet weathering investigation on micro‐/nano‐SiO ₂ filled silicone rubber composites

Thermal, electrical, and mechanical properties of addition‐type liquid silicone rubber co‐filled with Al₂O₃ particles and BN sheets