并流共沉淀法合成Dy_(2)O_(3)-ZrO_(2)纳米粉体

Synthesis of Dy_(2)O_(3)-ZrO_(2) nano powders by cocurrent coprecipitation

采用并流化学共沉淀法合成了Dy_(2)O_(3)掺杂ZrO_(2)(DySZ)纳米粉体材料,系统研究稳定剂掺杂量、阳离子浓度、反应系统pH值和煅烧温度对粉体材料物相组成、晶体结构和微观形貌的影响。结果表明:不同合成工艺条件下,DySZ粉体材料均具有纳米尺度特征,球形颗粒尺寸为10~30 nm,Dy_(2)O_(3)的掺杂可以起到稳定晶型的作用;稳定剂掺杂量对DySZ粉体的物相组成具有明显影响,掺杂量为10%(质量分数)时可合成单一四方相结构的DySZ粉体;DySZ粉体材料的四方度和微观形貌对稳定剂掺杂量、阳离子浓度、反应体系pH值和煅烧温度均不敏感,但其平均晶粒尺寸随稳定剂掺杂量、阳离子浓度和反应体系pH值的升高略有降低,随煅烧温度的提高而显著增加。

Nano-sized Dy_(2)O_(3) doped ZrO_(2) powders(DySZ)were synthesized by cocurrent co-precipitation method.The effects of Dy_(2)O_(3) content,cation concentration,pH value and calcination temperature on the phase composition,crystal structure,grain size and micromorphology of DySZ powders were investigated.Results show that under different synthesis conditions,the spherical DySZ powders have nano scale characteristics with a size range of 10-30 nm,Dy_(2)O_(3)-doping can promote the DySZ stabilized as tetragonal structure.The doping amount of stabilizer has a significant effect on the phase composition of DySZ powder.Single tetragonal DySZ can be obtained with 10%(mass fraction)Dy_(2)O_(3)-doping.No significant effect can be found between the tetragonality,microstructure of DySZ powders and the stabilizer content,cation concentration,pH value as well as calcination temperature.The average grain size exhibits a slight decrease with the increase of stabilizer content,cation concentration and pH value.Meanwhile,the elevated calcination temperature can promote the crystal growth of DySZ.