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碳酸盐沉淀法制备Y2O3纳米粉及透明陶瓷
  • 期刊名称:中国有色金属学报. 16(2). 235-240, 2006
  • 时间:0
  • 分类:TQ174.75[化学工程—陶瓷工业;化学工程—硅酸盐工业]
  • 作者机构:[1]北京大学化学与分子工程学院,北京100871, [2]东北大学材料与冶金学院,沈阳110004
  • 相关基金:国家自然科学基金资助项目(50372009)
  • 相关项目:粉体工程与粉末冶金
中文摘要:

以Y(NO3)3和NH4HCO3为原料,采用正向滴定法,得到了化学组成为Y2(CO3)3·2H2O的先驱沉淀物。结果发现:时效可使沉淀物的颗粒尺寸和形状发生明显变化,时效48h后,先驱沉淀物形状由球形变为针状;先驱物经水洗-乙醇清洗-丙酮清洗可提高Y2O3粉体的活性;针状先驱物在1100℃下煅烧4h能得到团聚轻的Y2O3粉体,粉体平均粒径约为80nm;所得粉体在1700℃真空烧结4h后,获得了透明Y2O3陶瓷。

英文摘要:

A carbonate precipitation process for synthesizing nanocrystalline yttria powder and transparent yttria ceramics was investigated. In this process Y(NO3)3 and NH4HCO3 were ultitized to precipitate a carbonate precursor with chemical composition of Y2 (CO3)3 · 2H2O. It is found that aging has a dramatic effect on the morphology and size of the precipitation precursor. After aging for 48 h, yttrium carbonate with a needlelike structure is formed. Employing distilled water, ethanol, and acetone washing process on the precipitation precursor, sinterability of the yttria powder can be enhanced. Yttria powders with good dispersion and a primary particle diameter of 80 nm are produced by calcining the needlelike precursor at 1 100℃ for 4 h. Transparent yttria ceramics are fabricated by vacuum sintering at 1 700℃ for 4 h.

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