以NH4HCO3,ZrOCl2·9H2O和Y(NO3)3为原料,在乙醇溶液中通过共沉淀法制备2Y-TZP纳米粉体,并对其中的反应机理进行研究.在沉淀过程中,NH4HCO3和ZrOCl2通过两步反应生成(NH4)3ZrOH(CO3)3·2H2O对沉淀.首先NH4HCO3和ZrOCl2反应生成Zr(OH)4,其后Zr(OH)4和NH4HCO3进一步反应生成(NH4)3ZrOH(CO3)3·2H2O.(NH4)3ZrOH(CO3)3·2H2O不稳定,在130℃即可分解生成ZrO2,并放出氨气、水和二氧化碳.沉淀产物经300和450℃煅烧后得到的ZY-TZP粉体颗粒尺寸细小,不存在大的硬团聚,具有良好的烧结性,在1225℃即可实现高度致密化.
2Y-TZP nanopowder was prepared by a coprecipitation method, using NH4HCO3, ZrOCl2·9H2O and Y(NO3)3 as the starting materials. During the precipitating process, (NH4)3ZrOH(CO3)3·2H2O
was formed through a two-step reaction. First, NH4HCO3 reacted with ZrOCl2·9H2O to form Zr(OH)4, then NH4HCO3 further reacted with Zr(OH)4 to form (NH4)3ZrOH(CO3)3·2H2O.
The resulting (NH4)3ZrOH(CO3)3·2H2O was unstable and decomposed into ZrO2, NH3, H2O and CO2 at about 130℃. The 2Y-TZP powders obtained by calcining the precipitate
mixture at 300℃ and 450℃ showed very fine particle sizes and were almost free of large hard aggregates. Furthermore, these powders showed good sinterability and could be highly
densified at a low temperature of 1225℃.
参考文献
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