Effect of Pyrolysis Temperature on Performance of Silicone Rubber Composite Insulators
Silicone rubber composite insulators(SiR)for electric power will encounter lightning strike or fire during operation,and SiR will fail due to complex changes such as expansion and cracking after pyrolysis at different temperatures.However,the pyrolysis performance of SiR and the microscopic reasons for these changes are still unclear.In this paper,the thermal degradation of SiR at different temperatures was discussed,and the relationship between pyrolysis temperature and the structure,mechanical properties and surface hydrophobicity of SiR was explored.The thermal stability of SiR was studied by synchronous thermal analyzer.The results show that the microstructure of SiR changes significantly with the increase of pyrolysis temperature.Due to the release of pyrolysis gas and molecular crosslinking in SiR,a large number of pores are produced on the surface of SiR,and the crosslinking degree and tensile properties of silicone rubber decrease.When the pyrolysis temperature is above 300℃,the mechanical properties and C—H bonds of the pyrolyzed SiR decrease obviously.
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