通常在BaTiO3中固溶PbTiO3来提高BaTiO3系PTCR的居里温度,但是铅的毒性和挥发性限制了BaTiO3系PTCR的应用,因此需要研制出高居里点的无铅PTCR陶瓷.随着BNT、BKT含量增加,BaTiO3系PTCR的居里点升高,但同时室温电阻快速增大.若在提高居里点的同时抑制室温电阻率的增大,就能制备出有实用价值的无铅高居里点的PTC材料.综述了BNT、BKT的含量对居里温度的影响及其机理,通过加入还原剂或在还原气氛下烧结并制定合理的烧结制度可以得到低室温电阻率和性能较好的PTC材料.
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