Ads by Google
PTC element for fan heater ;
Ceramic materials are usually good for high-insulation resistance, and ceramic PTC thermistor is barium titanate-based, the other doped polycrystalline ceramic materials manufacturer, has a lower resistance and semiconducting properties. The purpose of doping through a chemical prices higher material as crystal lattice yuan to achieve: In the crystal lattice of Barium Titanate ion ion or were part by the higher price of ion substitution, it has become a considerable quantity a free electronic conductivity. The PTC thermistor effect, that is, the higher resistance values Step reasons, the material organization is composed of many small-ceramic components, in the grain interface, the so-called grain boundaries (boundary) create potential barrier, impeding cross-border electronic access to the adjacent regions, and therefore have a high resistance, which in effect was offset by lower temperatures: In the grain boundary on the high dielectric constant and spontaneous polarization strength at low temperatures, hampered Barrier and the formation of the free flow of electronic. And this effect at high temperature, the dielectric constant intensity and polarization substantially reduced, leading to the barrier and resistance increased significantly, showing a strong PTC effect.