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用硬脂酸凝胶法工艺合成不同配比的α Fe2 O3 K2 O B2 O3复合氧化物超微粉 ,经液相烧结法制得多孔陶瓷材料 .采用XRD技术、Archimede排水法及压汞法等研究了材料物相、晶粒度及微孔结构 ;电导测试实验表明 ,B2 O3掺杂相可能以非晶态均匀包覆在主晶相晶粒表面及晶界处 ,K+被吸收包埋在B2 O3非晶相中 ;湿敏特性测试结果表明 ,硼掺杂 5% (摩尔分数 )左右 ,全湿区内材料阻 湿特性曲线线性关系良好 ,且感湿灵敏度较高、湿滞小 ,改变掺杂配比 ,可获得不同湿敏转变点的阻 湿特性曲线 ;初步探讨了材料多孔结构与湿敏性能之间的关系 ,得出通过硼掺杂调控材料微结构 ,可明显提高材料湿敏性能稳定性的结论 .
The α-Fe 2 O 3 K 2 O 2 O 3 composite oxides with different ratios were synthesized by the stearic acid gel process and the porous ceramic materials were prepared by liquid-phase sintering method. XRD, Archimede drainage and mercury intrusion porosimetry The material phase, the grain size and the micropore structure were characterized by means of electrical conductivity test. It was found that the B2 O3 doped phase could be uniformly coated on the surface and grain boundary of the main crystalline phase in an amorphous state. K + In the amorphous phase, the results of the humidity sensitivity test show that the material has a good linear relationship between the moisture-resistivity characteristic of the material in the whole wet zone and a high sensitivity to humidity, with a small wet-hysteresis and varying doping The moisture resistance characteristic curves of different humidity transition points can be obtained. The relationship between the porous structure and the moisture sensitivity properties of the materials has been discussed preliminarily. It is concluded that by controlling the microstructure of the material by boron doping, the moisture sensitive properties of the material can be remarkably improved Sexual conclusion.