【摘要】 以化学沉淀法制备HfO2纳米粉体,借助XRD、SEM、TEM、BET、激光粒度测试仪等测试方法研究了不同制备工艺对HfO2纳米粉料团聚状态的影响.采用初始浓度0.5mol/L的溶液,稳定溶液pH为9、添加表面活性剂PEG、用无水乙醇处理水洗后的湿凝胶、在700℃下煅烧,能制备无团聚,平均粒径为25nm,呈正交晶型的HfO2纳米粉体.200MPa冷等静压成型的素坯在氢气中1800℃C保温2h得到96％理论密度的主相为正交相,有少量单斜相存在的HfO2陶瓷烧结体.更多还原

【Abstract】 HfO2 nano powders were prepared by the chemical precipitant method. The influence of different preparation parameters on the agglomeration was-investigated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area techniques and laser particle analyzer. Non-agglomerated orthorhombic, HfO2 powders with a size of about 25nm can be obtained by controlling starting concentration and pH values of solution, adding surfactants, washing gels with alcohol and calcining at 700℃. Orthorhombic HfO2 ceramics of 96% theoretical density can be prepared by sintering at 1800℃ for 2h in hydrogen. The results show that there are both o-HfO2 and m-HfO2 in the sample, mainly o-HfO2.更多还原