Preparation Of Low Sintering Temperature And Low Resistance PTC-Barium Titanite Ceramics And Its Application In A Novel Fusion Thermostat

PTC-barium titanate, which has a common electrical device with its unique properties, has been widely used in household appliances, temperature controls, traffic, energy fields, etc. At present, the main trend of the development of PTC ceramics is low resistance and low sintering temperature technology. But the traditional technology of PTC ceramic has a high sintering temperature and resistance, which was limited in high-voltage electrical appliances and over-current protection areas, while high sintering temperature is not conducive to energy conservation and emission reduction targets. In this paper, through the sintering process and the regulation of doping elements, barium titanate-based PTC ceramics was prepared by sol-gel one step method. The decomposition of the precursor, the microstructure and morphology of ceramics were characterized by TG-DSC, XRD and SEM method. Finally, a new, safe, stable and reliable infusion thermostat was designed on this basis.The main contents of this paper include the following three aspects.First, on the basis of previous studies, liquid AST doped barium titanate-based PTC ceramic powders were prepared by sol-gel method. Additives and sintering process on the PTC properties and microstructure were discussed. The best sintering temperature is 1250℃, room temperature resistivity is 15.30Ω·cm, the voltage withstanding is 78.18V/mm, lift-drag ratio of 4.75, the temperature coefficient of 10.17%Second, based on the findings of AST doping, the liquid B/AST co-doped barium titanate-based PTC ceramic powders were prepared by sol-gel method. The B doping content, sintering process on the PTC properties and microstructure were discussed. The best sintering temperature is 1170℃, room temperature resistivity is 60.21Ω·cm, the voltage withstanding is 150V/mm, lift-drag ratio of 5.78, the temperature coefficient of 9.02% Finally, based on the above experiment, a new medical infusion thermostat was designed, which heating ceramics were prepared through the sol-gel one step method. The early prospects of the industrial production were explored.