The fabrication technological abilities and the properties of the ceramic products on base of the mixture of low- and high-fired BeO-powders

Abstract

The slurry-forming method was applied to fabricate the ceramic products out of the low-fired (50 %) and high-fired (50 %) BeO powders. For the additional products purification of the impurity elements after the organic bond burning out the impregnation in the sodium carbonate solution was used, the solutions having the equal concentrations, but the impregnating duration being different. The obtained products were investigated for the electric and chemical characteristics changing (the dielectric permittivity ε, the dielectric loss tangent tgβ) and for the heat conductivity λ to determine the possibility of their using in the electronic devices. It was discovered that the increasing of the BeOceramics samples impregnation duration in the Na2CO3 solution leads at the same time to the electrical and physical properties stabilization and to the ceramic products contamination with the sodium compounds impurities, which decreases their dielectric strength. To reduce this influence
the ceramic products have to be washed out thoroughly from the impurities in the chlorine hydride acid solution after they had been impregnated and heat treated at 1370 K. Ref. 12. Tab. 2.