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Ceramic Dielectrics with Relatively High Thermal Conductivities

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2 Author(s)
Holladay, C. ; The Brush Beryllium Company,Ohio ; Divita, S.

Ceramic dielectrics were prepared by dispersing a high dielectric constant phase in a beryllium oxide matrix. The dispersant phases were doped futile (Ti02) 'rod strontium and calcium til:anate. The microwave dielectric constants varied from 10 to 23 as a function of the amount of dispersed phase. The room temperature thermal conductivity of the same mixture-compositions varied from 0.27 to 0.6 cal/(cm, sec. °C). Mixture equations proved inadequate tcpredict the dielectric constant and thermal conductivity with any significant degree of accuracy. Loss tangents were generally 0.0007, or lower, except for strontium titanate which undergoes a relaxation at microwave frequencies, titus the mixture-loss was raised to 0.0024. The ceramic mixtures sintered to densities typically higher than 97% of theoretical and yielded flexural strengths of the order of 38 000 lbf/in2. These values compare favorably with those of single phrase BeO ceramics.

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Parts, Materials and Packaging, IEEE Transactions on  (Volume:PMP-2 ,  Issue: 4 )