湿敏多孔玻璃－陶瓷复合材料研究

HUMIDITY SENSING CHARACTERISTICS OF POROUS ZnCr2O4-LiZnVO4GLASS-CERAMIC MATERIALS

采用陶瓷液相烧结工艺，制成了ＺｎＣｒ＿２Ｏ＿４－ＬｉＺｎＶＯ＿４多孔玻璃－陶瓷复合材料，这种多孔玻璃－陶瓷复合材料是由ＺｎＣｒ＿２Ｏ＿４尖晶石相和ＬｉＺｎＶＯ＿４玻璃相组成的，ＺｎＣｒ＿２Ｏ＿４构成多孔陶瓷结构，其晶粒的表面被ＬｉＺｎＶＯ＿４组成的感湿玻璃包裹着。对多孔玻璃－陶瓷湿敏元件性能的测试结果表明，该元件具有性能稳定、寿命长和不需要加热清洗的特点，此外，对多孔玻璃－陶瓷抗老化机理进行了探讨。

ZnCr2O4-LiZnVO4 porous glass-ceramics have been prepared by liquid phase sinter-ing.The materials are composed of ZnCr2O4 spinel and LiZnVO4 glass. ZnCr2O4 forms the porous and its grain boundary is wrapped up with humidity sersing glass layer of LiZnVO4. The experiment results show that this type of sensing element is long-term stable and require no periodieal heat cleaning,The mechanism of long term-stability is discussed.