Effect of CaTiO ₃ Additive on the properties and microstructure of(Ba, Pb)TiO ₃-based PTC materials

This paper studies the effect of the CaTiO ₃ content and the sinter temperature on the properties and microstructure of(Ba, Pb)TiO ₃-based PTC materials. The results show that the optimum addition level of CaTiO ₃ is 3 mol% with the minimum room temperature resistivity and the best PTC effect. SEM observation shows that the grain is more uniform and compact after the addition of CaTiO ₃. The results show that the higher the sinter temperature is, the higher the temperature coefficient is. The heat preservation of the cooling phase can enhance the PTC effect.