公开(公告)号：US4960551A

公开(公告)日：1990-10-02

申请号：US273811

申请日：1988-11-21

申请人： Takamitsu Eonomoto ,  Hiroshi Ueda ,  Midori Kawahara ,  Naoki Okada ,  Noboru Murata

发明人： Takamitsu Eonomoto ,  Hiroshi Ueda ,  Midori Kawahara ,  Naoki Okada ,  Noboru Murata

IPC分类号： C04B35/468 ,  C04B35/472 ,  H01C7/02

CPC分类号： C04B35/4684 ,  C04B35/472 ,  H01C7/02

摘要： A modified lead barium titanate ceramic which has a fundamental composition of (Ba.sub.1-x-y Sb.sub.y Pb.sub.x)TiO.sub.3, where x is not greater than 0.9 and usually not smaller than 0.6 and y is from 0.001 to 0.1, and has a high positive temperature coefficient of resistivity (PTCR) over a range of temperature higher than about 350.degree. C. at the lower boundary, is produced by using a metal salt of an organic acid such as lead titanate salt of oxalic acid as the source of Pb and by adding at least one of BaCO.sub.3, SiO.sub.2, BN and TiO.sub.2 to the raw materials of the above fundamental composition. After thermally decomposing the organic acid metal salt the mixture of the raw materials including the additive(s) is compacted and sintered. By this method the sintering is achieved with good reproducibility and with little dissipation of lead, and the obtained titanate ceramic is good and durable in the PTCR characteristics and hence is useful as the material of a PTC thermistor functioning at medium-to-high temperatures.

摘要翻译： 具有（Ba1-x-ySbBx）TiO3的基本组成的改性的铅钛酸钡陶瓷，其中x不大于0.9且通常不小于0.6，y为0.001至0.1，并且具有高的正温度系数 通过使用诸如草酸的钛酸铅的有机酸的金属盐作为Pb的来源，并且至少加入至少在下边界处于高于约350℃的温度范围内的电阻率（PTCR） 一种BaCO3，SiO2，BN和TiO2为原料的上述基本成分。 在分解有机酸金属盐之后，将包含添加剂的原料的混合物压实并烧结。 通过这种方法，以良好的再现性和铅的少量耗散实现烧结，并且所得钛酸陶瓷在PTCR特性中是良好和耐用的，因此可用作在中 - 高温度下工作的PTC热敏电阻的材料。