Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Zeng, Shiyin; Li, Wendong; Peng, Yanan; Zhang, Yucheng; Zhang, Guan-Jun

doi:10.3390/polym15153210

Cited by 7 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) We have studied the mechanical and dielectric properties of silicone rubber materials used in cable accessories under high-temperature shielding materials [5]. This does not apply to the actual conditions where the cable runs under power frequency voltage for a long time and may withstand operating overvoltage and lightning overvoltage.…”

Section: Literature Reviewmentioning

confidence: 99%

Silicone rubber thermal aging performance for cables and accessories

2024

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Polymer-based semiconductor materials are mainly used for cable body and cable accessories to ensure long-term stability of power cables. The physical and chemical properties of the semi-conductive shielding layer of the cable will change due to aging. The new silicone material has excellent insulation and mechanical properties and is widely used in cable accessories. In this paper, the insulation materials—silicon rubber is studied. First, the silicone rubber sample is prepared. Then, the mechanical and dielectric properties of the samples before and after aging are tested. The results show that thermal aging has a significant effect on the characteristic parameters of silicone rubber. With the increase of aging time, the hardness and elastic modulus of the silicone rubber sample gradually increased, while the tensile strength and elongation at break significantly decreased with the increase of aging time. With the increase of aging time, the thermal stability of the silicone rubber sample decreases, the cross-linking degree of the system increases, and the organic property decreases. The measurement and analysis of thermal aging characteristics of silicone rubber can help to reduce the failure frequency of cable accessories and improve the safety.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

Silicone rubber thermal aging performance for cables and accessories

2024

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…Li Shuzhen et al have developed a silicone rubber aging test method that takes into account temperature cycling. They have summarized the effects of temperature cycling on the aging mechanism and behavior of silicone rubber, and confirmed that temperature cycling can lead to the fatigue failure of silicone rubber material [18]. Zhang Zhongyuan et al utilized scanning electron microscopy and Fourier transform infrared spectroscopy to analyze the degradation mechanism of the silicone rubber sheath on the surface of composite crossarms under the individual effects of different aging factors.…”

Section: Introductionmentioning

confidence: 99%

Study on the Ageing Characteristics of Silicone Rubber for Composite Insulators under Multi-Factor Coupling Effects

Li,

Zhang,

Chen

et al. 2023

Coatings

View full text Add to dashboard Cite

Due to long-term exposure to high electrical field strength, heavy loads, and the complex climatic conditions in tropical coastal areas of China, widespread abnormal heating phenomena often occur in the operation of composite insulators in power transmission lines, posing a threat to the safe and stable operation of the power system. To study the ageing process of the silicone rubber sheath of composite insulators in the high-field, high-humidity, high-temperature, and high-salt-density environments along the coastal regions, this paper establishes a humidity–heat–electricity–salt spray accelerated ageing test platform and conducts ageing tests on silicone rubber materials for composite insulators under the coupled effect of multiple factors. The ageing characteristics of silicone rubber materials are analyzed using scanning electron microscopy, Fourier infrared spectroscopy, thermogravimetric analysis, and other methods. The results show that the coupled ageing factors have an impact on the surface morphology of silicone rubber. The continuous depolymerization of PDMS molecular chains leads to a decrease in the content of groups related to the hydrophobicity of the material, resulting in a deterioration of its hydrophobicity. Moreover, the degradation of silicone rubber materials and the enhanced moisture absorption capacity lead to an increase in the dielectric loss tangent of the saturated moisture-absorbing medium, thereby causing abnormal heating of the sheath at the end of the composite insulator. The research findings of this study are of significant reference value for revealing the degradation mechanism of composite insulator silicone rubber sheaths in tropical island environments and improving the service life of composite insulators.

show abstract