以碳酸氢铵为沉淀剂, 研究了不同沉淀反应终点pH值、陈化时间, 以及沉淀前驱体煅烧温度对超细氧化钇粉体的形态和烧结致密化的影响. 沉淀反应终点pH=7.0和7.8时, 随着陈化时间的增加, 煅烧后的粉体颗粒均匀长大、形态近似于球形, 烧结致密化程度较高. 在pH=8.3时, 陈化处理后粉体颗粒长大明显且呈不规则形状, 而且随陈化时间增长, 粉体的烧结活性降低. 另外, 沉淀前驱体在800 ℃煅烧得到的超细氧化钇粉体中残留较多的非晶相, 造成粉体烧结致密化程度降低;在1000 ℃煅烧时可以完全消除粉体中的非晶体相, 所得到的超细球形粉体颗粒的烧结温度低, 致密化程度高.
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