DEVELOPMENT OF FIXED MULTILAYER CAPACITORS USING HIGH-K DEVITRIFIED GLASS DIELECTRIC.
Rept. no. 6 (Final), 1 May 62-31 Oct 63,
CORNING GLASS WORKS NY
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Means were developed for forming glass ribbon for high dielectric constant glass-ceramic capacitors to thicknesses of .0015 to .002 in. with very short-lived alumina-coated rollers, and to thicknesses of .0023 - .003 in. with durable beryllia rollers. Exploration of dielectric composition and electrode foil combinations led to the selection of composition X899CQL, assembled with gold electrode foils. Heat treatment experiments established that best properties were obtained by the most rapid temperature rise obtainable, and that, apart from this, only the maximum temperature attained was important in determining dielectric properties of a given composition. It was demonstrated that stack pressing and heat treatment might be accomplished in a single operation. Recommendations for future work center around search for suitable long-life rollers and development of equipment for straightening the glass ribbon. When this is completed relatively large numbers of capacitors of final design should be fabricated and tested. Author