低电阻率高性能PTCR陶瓷材料-汽车闭锁器马达过电流保护元件的制备

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

为满足汽车电器等低电压下的保护元件的需求，研制低电阻率高性能PTCR陶瓷材料已成为研究的热点．本工作采用通常的混合氧化物工艺制备了室温电阻率＜10Ω·cm，电阻率的突变达到105的高性能PTCR热敏电阻陶瓷．并研究了原材料，固溶体的基方组成，各种添加物以及烧结工艺等对PTCR陶瓷性能的影响，特别注意了用液相方式添加施主和受主杂质在制备低电阻率的高性能PTCR陶瓷时起的更为有效的作用，对材料的化学组成，制备（烧结）工艺，显微结构和PTCR效应之间的关系进行了讨论．用本材料制备的元件能用于汽车闭锁器马达的过电流保护．

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.