摘要
采用溶胶—凝胶法新工艺制备了不同配比的纳米级α -Fe2 O3 -Al2 O3 -K2 O复合氧化物湿敏陶瓷。XRD、BET比表面吸附、Archimede排水法等手段对系列纳米陶瓷物相及微结构进行了分析表征。湿敏特性测试结果表明 :调控各组分摩尔配比为r(Fe∶Al∶K) =90∶5∶5,可获得全湿区阻—湿特性线性关系良好、感湿灵敏度较高、湿滞小、使用温度范围宽、响应速度较快、性能一致性优的湿敏元件。提出组份间界面作用模型 。
Nanometer-sized humidity-sensitive ceramics α-Fe 2O 3-Al 2O 3-K 2O were prepared by Sol-gel technology,and their phase composition and microstructure were studied by means of XRD diffraction,specific surface area absorption (BET) and archimede replacement water method.The humidity-sensitive characteristics experimental results showed that through regulating component molar ratio r (Fe∶Al∶K) =90∶5∶5,α-Fe 2O 3-Al 2O 3-K 2O ceramics might exhibit and ideal resistance—humidity linearity,a good sensitivity characteristic,small hystereris,fast response time and a wide working temperature scope.Furthermore,a model of α-Fe 2O 3 surface amorphous shell layer was given,and factors effecting hysteresis of ceramics α-Fe 2O 3-Al 2O 3-K 2O was discussed.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2000年第3期10-12,共3页
China Ceramics
基金
国家自然科学基金! (No .2 9571 0 2 6)
关键词
溶胶-凝胶
复合氧化物陶瓷
湿敏陶瓷
纳米级
Sol-gel
α-hematite
nanometer-sized
complex oxide ceramics
humidity-sensitive
