烧结工艺对SnO_2棒状晶湿敏陶瓷电容特性影响研究

Study on Influence of Calcining Process on Humidity Sensing Capacitance of SnO_2 Rod Shaped Grains Humidity Sensitive Ceramic

通过共沉淀法制备出SnO_2棒状晶湿敏陶瓷,考察了烧结工艺对材料微结构和湿敏电容性能的影响,包括烧结温度和保温时间对湿度电容的影响。实验结果表明,烧结工艺对材料的微结构和湿敏电容都具有较大影响。适当的烧结温度和保温时间可使材料具有棒状晶粒的微结构和较好的湿敏电容。电容频率特性分析表明,试样的电容在低频范围随烧结温度的升高和保温时间的延长先减小后增大,但高频范围几乎不随烧结温度变化。

SnO 2 nanometer powers were prepared by co-precipitation.The effects of calcining process on humidity sensitive capacitance and microstructure of the samples were researched.,including calcining temperature and time.The experimental results show that the calcining process has effect on the humidity sensitive capacitance and microstructure of the material,and the humidity sensitive characteristics and suitable rod shaped grains can be improved by controlling the calcining temperature and time.The characteristics of capacitance-frequencies show that the capacitance of the sensor first decreases then increases as calcining temperatures and time increase for low measurement frequency,but it hardly changes with the calcining temperature in the high frequency range.