| 摘要 |
<p>A PTC thermistor material in which a conductive phase having a specific resistance which is lower than that of a matrix phase and abruptly changes near the melting point of the conductive phase is nearly uniformly distributed in the matrix phase. The matrix phase is made of a polycrystalline ceramic, glass-polycrystalline ceramic composite material, glass, crystallized glass, high polymer material, etc., and the conductive phase is made of a metal composed mainly of Bi. Therefore, various characteristics of the thermistor material, such as the PTCR characteristic appearing temperature, rate of change in specific resistance, etc., can be controlled and the material can be applied to such circuit parts that are normally subject to large currents. In addition, the material can be manufactured easily and a stable PTCR characteristic can be obtained from the material. Moreover, the rated current and degree of freedom in shape of the material can be increased even when the size of the material is reduced.</p> |
