甘氨酸-硝酸盐法合成纳米YSZ微粉及其性能

用甘氨酸-硝酸盐法合成了纳米级钇稳定化氧化锆（YS Z）微粉. 用粉末X射线衍射方法对合成产物和煅烧粉体进行物相分析， 并计算了YSZ合成粉 体的平均晶粒尺寸. 用热膨胀仪和交流阻抗谱分别研究了合成原粉的烧结收缩率和烧结样品 的电学性能. 研究结果表明， 当金属离子与甘氨酸的摩尔比为1∶2时， 用甘氨酸-硝酸盐 法可直接合成纳米级YSZ微粉， 600 ℃和1 000 ℃煅烧粉体的平均晶粒尺寸分别为9.8 5和40.5 nm. 经1 000 ℃预烧的YSZ样品的烧结性能明显高于1 200 ℃预烧YSZ样品. YSZ样 品在1 400 ℃烧结6 h的相对密度分别为99.3%和98.6%， 烧结温度范围为1 400~1 450 ℃ . 经1 450 ℃烧结后的样品在850 ℃时电导率分别为0.037和0.021 S/cm.

Preparation and properties of nanometer YSZ powders by glycine-nitrate process

Nanometer yttria stabilized zirconia (YSZ) powders were prepared by means of glycine-nitrate process (GNP). The phases of the synthesized product and the calcined powders were analyzed by X-ray diffraction, and the average crystallite size of the YSZ powders was calculated. The sintering shrinkage of the synthesized powders and the electrical properties of the sintered samples were studied with thermal expansion and a.c. impedance spectra, respectively. It was found that the nanometer YSZ powders can be directly synthesized by means of GNP when a molar ratio of the metal ions to glycine was 1∶2. The aver age crystallite size of the YSZ powders calcined at 600 and 1 000 ℃ are 9.85 a nd 40.5 nm, respectively. The sinterablity of the YSZ samples pre-sintered at 1 000 ℃ is significantly higher than that pre-sintered at 1 200 ℃. The relati ve density of the samples treated above is 99.3% and 98.6% sintered at 1 400 ℃ for 6 h, respectively, and the sintering temperature range is 1 400~1 450 ℃. The electrical conductivity of the above samples sintered at 1 450 ℃ is 0.037 and 0.021 S/cm at a measuring temperature of 850 ℃.