一种杂原子改性钛酸盐热敏电阻材料的制备方法

A Preparation Method for Hetero-atom Modified Titanate Thermistor Materials

用非金属元素、金属与非金属共掺杂钛酸盐制备了一系列杂原子改性的钛酸盐热敏电阻材料,并测试了其性能,以便甄选符合工业化生产的制备工艺.结果发现:通过对预烧粉体材料进行扫描电子显微镜(SEM)分析,得出掺入量为0.5%时得到的形貌最佳;1350℃进行烧结居里温度基本达到产品上限,再继续升高温度对提升居里温度效果不明显;随着掺杂量的增大,热敏电阻的阻值数据逐渐上升,0.005 mol为最佳掺杂量,重复性实验平均阻值为50Ω,阻值分布范围较小,数值较集中,符合批量生产要求.

Non-metallic elements,metal and non-metallic co-doped titanate were tried to prepare a series of hetero-atom modified titanate thermistor materials,and their properties were tested,and the preparation process conforming to industrial production was selected. Scanning electron microscope(SEM)were used to analyze the preburned powder material,and the optimum morphology was obtained when the mixing amount was 0. 5%. At the same time,sintering Curie temperature at 1350℃ basically reached the upper limit of the product,and further increasing the temperature had no obvious effect on increasing the Curie temperature. With increasing of the doping amount,the thermistor resistance data gradually rise,0. 005 mol is the best doping amount. For the average value of 50 Ω in repetitive experiments,the resistance distribution range is small,numerical relatively concentrated,comply with the requirement of mass production.