PTC THERMISTOR CERAMIC COMPOSITION AND PTC THERMISTOR ELEMENT

A barium titanate based PTC thermistor ceramic composition without using Pb. Its Curie temperature is shifted to a temperature higher than 120° C. The PTC thermistor can readily turn semiconductive even if it is sintered in air. The resistivity at 25° C. is low and the variation rate of the resistiv...

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Bibliographic Details
Main Authors ITOH KAZUHIKO, SHIMURA YOSHIKAZU
Format Patent
LanguageEnglish
Korean
Published 11.09.2015
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:A barium titanate based PTC thermistor ceramic composition without using Pb. Its Curie temperature is shifted to a temperature higher than 120° C. The PTC thermistor can readily turn semiconductive even if it is sintered in air. The resistivity at 25° C. is low and the variation rate of the resistivity at 25° C. with time is little. The PTC thermistor ceramic composition includes a sintered body having a barium titanate based compound represented by formula (1) as the main component, (Ba1-x-y-wBixAyREw)α(Ti1-zTMz)O3 (1), wherein, 1.02y≦x≦1.5y (2), 0.007≦y≦0.125 (3), 0≦(w+z)≦0.01 (4), 0.97≦α≦1.06 (5), and the sintered body contains Ca in a ratio of 0.01 mol or more and less than 0.05 mol relative to 1 mol of Ti site in terms of element.
Bibliography:Application Number: KR20157021068