Properties of silicone rubber housings and coatings

Author

Gubanski, Stanislaw Michal

Author_Institution

Dept. of Electr. Plant Eng., R. Inst. of Technol., Stockholm, Sweden

Volume

27

Issue

2

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

374

Lastpage

382

Abstract

The author reports on the properties of a silicone rubber (SR) composite insulator housing material and a RTV silicone coating for porcelain insulators after a surface deposition of salt pollutants. The materials had undergone long-term aging under natural service conditions. It was found that a wettability recovery effect could appear after a corona treatment on the SR housing material, but this did not occur in the case of the RTV coating. The difference is probably due to the fact that the SR housing, even after exposure to a long-term service, can still embed pollutants in a low molecular polymer structure, whereas the RTV coating loses this ability when subjected to the same aging conditions. This is confirmed by ESCA analysis. The materials were also investigated by means of TSD current technique. Significant changes due to natural aging were found in the thermokinetic parameters of a high-temperature polarization process. It is suggested that these parameters might be used for material comparison

Keywords

ageing; composite insulating materials; corona; insulators; packaging; silicones; ESCA; TSD current technique; coatings; composite insulator; corona treatment; high-temperature polarization process; housings; long-term aging; porcelain insulators; salt pollutants; silicone rubber; surface deposition; thermokinetic parameters; wettability recovery effect; Aging; Coatings; Composite materials; Insulation; Pollution; Porcelain; Rubber; Strontium; Surface contamination; Surface treatment;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.135608

Filename

135608