用纳米粉制备线性NTC敏感陶瓷材料

Preparing Linear NTC Sensitive Ceramic Material with Nano-Powders

重点研究了由CdO-SnO2-WO3系列(简称Cd-Sn-W)和CdO-Sb2O3-WO3系列(简称Cd-Sb-W)及由它们共同组成的双基体三相(Cd2Sb2O7,CdSnO3,CdWO4)结构线性敏感陶瓷的制备方法。给出了上述半导体陶瓷的电子转移式;分析了半导相Cd2Sb2O7和CdSnO3的导电机理和电阻-温度(R-T)曲线呈线性的机理,并对其他相关特性进行了分析和研究。独立地设计了用化学共沉淀方法制备上述NTC(负温度系数)陶瓷微粉的化学反应方程式,并对聚乙二醇和无水乙醇在制备纳米微粉时所起的防止颗粒发生团聚现象的作用进行了分析。由于大分子量的聚乙二醇几乎是无毒的,对人体基本无毒害作用,因而有广泛的推广价值。

The preparation method of CdO-SnO2-WO3 series （Cd-Sn-W for short）, CdO-Sb203-WO3 series （Cd-Sb-W for short） and double-base three-phase （Cd2Sb2O7, CdSnO3, CdWO4） structure linear ceramics made of these two combined materials were studied. The electron transfer formulas of these semiconducting ceramics were given. The electric conduction mechanism of Cd2Sb2O7 and the linearization mechanism of resistance-temperature curve were analysed. Relevant properties were analysed and studied. The equations were independently designed, according to which NTC （negative temperature coefficient） ceramic micro powders were prepared through chemical coprecipitation. The part that polyethylene glycol （PEG） and anhydrous ethanol played to prevent granules agglomeration when making nano-powders was analyzed. As large formula weight polyethylene glycol has no poisonous and no harm to people＇s health, it is worth popularizing widely.