Abstract
ACCORDING to an article by M. D. Rigterink (Bell Lab. Rec., 21, No. 9 ; May 1943) electrical porcelains which are satisfactory and useful materials for low-frequency currents have been replaced for high-frequency currents by new ceramic materials which have far smaller power factors. This replacement becomes absolutely essential at elevated temperatures such as are encountered in power vacuum tubes in which the insulator operates almost red hot. The power factor of most ceramics increases very markedly with increase in temperature, this causing more conversion of electrical energy into heat and producing a cumulative effect which may lead to a breakdown in any but the very best materials.
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CERAMICS FOR HIGH-FREQUENCY INSULATION. Nature 152, 453–454 (1943). https://doi.org/10.1038/152453b0
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DOI: https://doi.org/10.1038/152453b0