摘要
研究了化学沉淀法制备氧化钇超微粉的工艺及透明氧化钇陶瓷的制备工艺·以Y(NO3)3和NH3·H2O为原料,采用沉淀法制备出化学组成为Y2(OH)5(NO3)·nH2O的先驱沉淀物·发现在Y(NO3)3溶液中添加少量(NH4)2SO4,可以使先驱沉淀物由规则颗粒变为雪花状,并能减轻煅烧得到的氧化钇粉体的团聚·先驱沉淀物在1100℃下煅烧4h,得到了平均粒径为50nm的氧化钇粉体·该粉体经单向压制成型后,在1700℃真空烧结4h得到了透明Y2O3陶瓷·
?Synthesis of nanocrystalline yittria powder by precipitation method and fabrication of transparent yittria ceramics have been investigated. Precursor precipitate of Y2(OH)5(NO3)·nH2O was synthesized from Y(NO3)3 and NH3·H2O. It was found that the addition of small amount of (NH4)2SO4 into the Y(NO3)3 solution can transform the shape of the precursor precipitates from particulate to snowflake so that to reduce the degree of agglomeration. Nanocrystalline yttria powder (50?nm in diameter) was obtained by calcining the precursor at 1?100?℃ for 4 hours. The yttria powder was sintered into a transparent body by vacuum sintering at 1?700?℃ for 4 hours without any additives.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2002年第12期1151-1154,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50172010)
关键词
Y2O3
氧化钇
超细粉
透明陶瓷
沉淀法
硫酸根离子
低温制备
工艺
yttria
ultrafinepowders
transparent ceramics
precipitation method
sulfate ions
low-temperature synthesis