By Hua-Tay Lin, Dongming Zhu, Tatsuki Ohji, Andrew Wereszczak
This quantity is an invaluable source for knowing the main beneficial facets of complex ceramic coatings and interfaces. Containing twelve contributed papers from the symposium, issues comprise vibration damping coatings, thermal and environmental barrier coating processing, checking out and lifestyles modeling, non-destructive assessment, multifunctional coatings and interfaces, highlighting the cutting-edge ceramic coatings applied sciences for numerous severe engineering purposes.
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Extra resources for Advanced Ceramic Coatings and Interfaces IV (Ceramic Engineering and Science Proceedings)
Figure 9. Insulator with semiconductor glaze after the end of salt spray chamber test. CONCLUSIONS Homogenous antimony oxide (Sb203) doped tin oxide (Sn02) dispersion was obtained in industrially transparent glaze which showed evident semiconductor character. The lower linear thermal expansion coefficient of the semiconductor glaze led to a higher mechanical strength of the insulator. Even with an abnormal salt accumulation, the insulators with semiconducting glaze were fully operative, which indicates a longer lifetime when applied in normal conditions.
Fredel CERMAT, Universidade Federai de Santa Catarina Florianópolis, SC, Brazil ABSTRACT The flashovers that occur in electrical insulators are problems that can shut down the transmission and distribution electrical energy line. Insulators placed in regions with high salinity or atmospheric pollution are more susceptible to failure by occurrences of flashover. In the present work the effect of the application of a semiconductor coating containing 95 wt% SnÜ2 and 5 wt% Sb203 to high-voltage electrical insulators was studied.
The semiconductor properties of the glaze was qualitatively analyzed during SEM observation: the samples were partially coated with a conductor material; in this way, if the samples were semiconductor they could carry the small current generated by SEM electron beam and avoid the phenomena called charging-up. Figure 3 shows the coating procedure: normally insulating samples must be full coated and grounded to avoid the electrons accumulating over their surface and generate the charging-up phenomena.