摘要
本工作研究了 NKBT 系致密陶瓷和 MAS 系多孔陶瓷感湿体在高温(100℃),高湿(97%RH),实验室大气和含3vol%的 NO_2、H_2S、CO_2和 SO_2的空气中进行老化后的阻抗变化。实验发现,在高温或高湿环境中老化,两种感湿体的阻抗—湿度曲线漂移都很小,而在含有上述气体的空气中老化,阻抗漂移都很大;两种陶瓷的差别在于,致密陶瓷的阻抗在大多数老化条件下随时间降低,漂移值也小,多孔陶瓷则大部分随时间升高,漂移值大得多。对实验结果和流行的关于老化机理的观点进行了讨论。
The changes of impedence of humidity sensitive bodies with dense ceramics inK_xNa_yBi_(1-x-y)TiO_3 system and with porous ceramics in MnO-Al_2O_3-SiO_2 systemduring aging at high temperature(100℃)and high humidity(97% RH),in labo-ratory atmosphere and in the air containing 3%(Vol.) NO_2,H_2S,CO_2,and SO_2respectively were investigated in this work.It was found that if they were aged inhigh temperature or high humidity condition their drifts in impedence-humidity curveswere very small,while aged in the air containing those gases mentioned above werelarge.The difference between dense and porous ceramics was that the impedence ofthe former decreased with aging time,while that of the latter increased.From theexperimental results the aging mechanism was also discussed.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第4期453-460,共8页
Journal of Inorganic Materials
基金
国家自然科学基金:5860365
关键词
陶瓷
湿敏元件
老化
湿度传感器
Humidity sensitive element
Aging
Ceramic humidity sensor
