标题:
水热法制备8YSZ纳米粉体及其烧结活性的研究Hydrothermal Synthesis of 8YSZ Nanopowders and Their Sinterabilities
作者:
范宝安, 颜家保, 邱江华, 颜晓潮
关键字:
氧化钇稳定的氧化锆, 纳米粉体, 水热法, 烧结活性YSZ; Nanopowders; Hydrothermal Method; Sinterability
期刊名称:
《Hans Journal of Nanotechnology》, Vol.1 No.1, 2011-05-31
摘要:
本文采用化学共沉淀结合水热晶化的方法，在200℃的温度下合成出了具有立方相的8YSZ([ZrO2]0.92⋅[Y2O3]0.08) 纳米粉体，粉体的晶粒尺寸在7 ~ 8 nm左右，粉体为软团聚，团聚体强度只有20MPa，粉体具有很高的烧结活性，1000℃下就开始了快速收缩，1065℃下收缩速率达到最快，1200℃下收缩基本结束，块体材料1000℃下保温8 h或1100℃下保温4 h以后就基本上实现了致密化，相比之下采用化学共沉淀结合水洗-醇洗-煅烧法需要在1300℃烧结10 h才能基本上实现致密化。水热晶化法制备的8YSZ纳米粉体的高烧结活性来自于粉体细小的晶粒尺寸和松散的软团聚。
The cubic phase 8YSZ ([ZrO2]0.92⋅[Y2O3]0.08) nanopowders were synthesized by a chemical co-precipitation method combined with hydrothermal crystallization treatment. The average size of 8YSZ crystallines was in the range of 7 - 8 nm and they were softly congregated with the aggregation strength of only 20 MPa. The as-synthesized 8YSZ nanopowders exhibited high sinterabilities, and they started to rapidly thermo shrink at 1000℃ and reached the maximum shrinkage rate at 1065℃. At 1200℃, the shrinkage process was basically finished. When sintered at 1000℃ for 8 hrs or 1100℃ for 4 hrs, the block of 8YSZ nanopowders can be basically densified, whereas the block of 8YSZ nanopowders synthesized by water- and ethanol-washed can only be basically sintered to dense at 1300℃ for 10 hrs. The high sinterabilities of hydrothermal 8YSZ nanopowders are attributed to their fine crystalline size and incompact aggregation.