High Performance PTCR Ceramic Material with Low Resistivity-Preparation of Overcurrent Protector for Door Lock Motor in Automobile

The development of PTCR ceramic material with low resistivity and high performance has been recently become one of the hot spots in the electronic ceramic research in order to meet the requirement of overload protection in automobile and other low voltage applications. PTCR ceramic material based on BaTiO3 with electrical resistivity at room temperature 10 Ω·cm and resistivity jump -105 was prepared by conventional mixed -oxide method. The properties of raw material, the constituents of solid solution, and additives and the schedule of sintering process were studied, and more attention was paid to the method of adding donor and acceptor in liquid solution. The relationship between composition, process, performance and microstructure during the ceramic preparation was discussed. The device made of the PTCR ceramic material obtained can be used aJs an overcurrent protector for door lock motor in automobile.