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US08686827B2 PTC element and heating-element module 失效
PTC元件和加热元件模块

PTC element and heating-element module
Abstract:
An object is to provide a PTC element that can be made thinner, using a Pb-free semiconductor ceramic composition.The object is achieved with a PTC element including at least two metal electrodes and a BaTiO3 system semiconductor ceramic composition arranged between the electrodes, in which, in the semiconductor ceramic composition, a portion of Ba in the BaTiO3 system is substituted by Bi—Na and a semiconductorizing element, vacancies are formed on Bi sites by depleting at least a portion of Bi, and oxygen defects are formed on a crystal thereof. Since the PTCR characteristic at the inside of the semiconductor ceramic composition is negligibly weak in comparison with the PTCR characteristic at the interface between the semiconductor ceramic composition and the electrodes, the PTC element can be made thinner.
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