Interpreting Surface Degradation of HTV Silicone Rubber Filled with Micro/Nano-Silica Under AC and DC Voltages

2020 ◽  
Vol 49 (9) ◽  
pp. 5399-5410
Author(s):  
Muhammad Akbar ◽  
Rahmat Ullah ◽  
M. R. Abdul Karim
Keyword(s):  
Silicone Rubber ◽  
Nano Silica ◽  
Surface Degradation

scholarly journals Ceramization Mechanism of Ceramizable Silicone Rubber Composites with Nano Silica at Low Temperature

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3708
Author(s):  
Penghu Li ◽  
Haiyun Jin ◽  
Shichao Wei ◽  
Huaidong Liu ◽  
Naikui Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flexural Strength ◽  
Silicone Rubber ◽  
Glass Frit ◽  
Nano Silica ◽  
Linear Contraction ◽  
Ceramic Phase ◽  
Ceramic Samples ◽  
Different Temperatures ◽  
Similar Materials

Ceramizable composite is a kind of polymer matrix composite that can turn into ceramic material at a high temperature. It can be used for the ceramic insulation of a metal conductor because of its processability. However, poor low-temperature ceramization performance is a problem of ceramizable composites. In this paper, ceramizable composites were prepared by using silicone rubber as a matrix. Ceramic samples were sintered at different temperatures no more than 1000 °C, according to thermogravimetric analysis results of the composites. The linear contraction and flexural strength of the ceramics were measured. The microstructure and crystalline phase of ceramics were analyzed using scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the composites turned into ceramics at 800 °C, and a new crystal and continuous microstructure formed in the samples. The flexural strength of ceramics was 46.76 MPa, which was more than twice that of similar materials reported in other research sintered at 1000 °C. The maximum flexural strength was 54.56 MPa, when the sintering temperature was no more than 1000 °C. Moreover, glass frit and nano silica played important roles in the formation of the ceramic phase in this research. A proper content of nano silica could increase the strength of the ceramic samples.

Evaluation of surface degradation of silicone rubber using gas chromatography/mass spectroscopy

2000 ◽  
Vol 15 (2) ◽  
pp. 796-803 ◽  
Author(s):  
H. Homma ◽  
T. Kuroyagi ◽  
K. Izumi ◽  
C.L. Mirley ◽  
J. Ronzello ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Mass Spectroscopy ◽  
Silicone Rubber ◽  
Surface Degradation ◽  
Gas Chromatography Mass Spectroscopy

scholarly journals Manifestation of Interactions of Nano-Silica in Silicone Rubber Investigated by Low-Frequency Dielectric Spectroscopy and Mechanical Tests

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 717 ◽  
Author(s):  
Chao Wu ◽  
Yanfeng Gao ◽  
Xidong Liang ◽  
Stanislaw M. Gubanski ◽  
Qian Wang ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Power Transmission ◽  
Mechanical Performance ◽  
Filler Content ◽  
Low Frequency ◽  
Mechanical Tests ◽  
Nano Silica ◽  
Rubber Composites ◽  
Rubber Composite ◽  
Surface Modified

Silicone rubber composites filled with nano-silica are currently widely used as high voltage insulating materials in power transmission and substation systems. We present a systematic study on the dielectric and mechanical performance of silicone rubber filled with surface modified and unmodified fumed nano-silica. The results indicate that the different interfaces between the silicone rubber and the two types of nano-silica introduce changes in their dielectric response when electrically stressed by a sinusoidal excitation in the frequency range of 10−4–1 Hz. The responses of pure silicone rubber and the composite filled with modified silica can be characterized by a paralleled combination of Maxwell-Wagner-Sillars interface polarization and DC conduction. In contrast, the silicone rubber composite with the unmodified nano-silica exhibits a quasi-DC (Q-DC) transport process. The mechanical properties of the composites (represented by their stress-strain characteristics) reveal an improvement in the mechanical strength with increasing filler content. Moreover, the strain level of the composite with a modified filler is improved.

scholarly journals Investigation of Surface Degradation of Aged High Temperature Vulcanized (HTV) Silicone Rubber Insulators

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3769 ◽  
Author(s):  
Mohamed Ghouse Shaik ◽  
Vijayarekha Karuppaiyan
Keyword(s):  
Silicone Rubber ◽  
Degradation Mechanism ◽  
Low Cost ◽  
Polymeric Composite ◽  
Work Conditions ◽  
Contact Angles ◽  
Electrical Performance ◽  
Surface Degradation ◽  
Physicochemical Changes ◽  
Service Period

Polymeric composite insulators are subjected to varying work conditions like rain and heat, which create an impact on degradation during their long service period. Electrical tracking under the Alternating Current (AC) field plays a predominant role in surface degradation, which can be different for fresh and aged insulations. The tracking studies on the fresh and aged polymeric insulation therefore become significant. Motivated by this, an indigenous low-cost electrical tracking setup was developed, and the tracking studies were carried out as per International Electro technical Commission standard (IEC) 60587 on fresh, thermal-aged and water-aged silicone rubber samples. Contact angles of samples were measured to analyse the effect of ageing on hydrophobicity. Further, to analyse the influence of ageing on insulation integrity, tracking tests were conducted and parameters like leakage current pattern and magnitudes, tracking length and loss of weight in the material due to tracking were examined. The physicochemical impacts of ageing on the surface degradation of the samples were also analysed using X-ray diffraction analysis and Fourier Transform Infrared Spectroscopy analysis. The investigations added insight into the degradation mechanism of polymeric insulators in terms of their electrical performance and physicochemical changes in the material. Comparison of these changes showed that ageing could influence surface degradation of samples.

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