High Breakdown Strength, Multilayer Ceramics for Compact Pulsed Power Applications
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Advanced ceramics are being developed for use in large area, high voltage devices in order to achieve high specific energy densities 10 expon 6 Jm3 and physical size reduction. Initial materials based on slip cast TiO2, exhibited a high bulk breakdown strength BDS 300 kVcm and high permittivity with low dispersion epsilon100. However, strong area and thickness dependencies were noted. To increase the BDS, multilayer dielectric compositions are being developed based on glassTiO2,composites. The addition of glass increases the density 99.8 theoretical, forms a continuous grain boundary phase, and also allows the use of high temperature processes to change the physical shape of the dielectric. The permittivity can also be manipulated since the volume fraction and connectivity of the glassy phase can be readily shifted. Results from this study on bulk breakdown of TiO2 multilayer structures with an area of 2cm and 0.1 cm thickness have measured 650 kVcm. Furthermore, a strong dependence of breakdown strength and permittivity has been observed and correlated with microstructure and the glass composition. This paper presents the interactive effects of manipulation of these variables.
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass