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.
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 700degreesC. Orthorhombic HfO2 ceramics of 96% theoretical density can be prepared by sintering at 1800degreesC for 2h in hydrogen. The results show that there are both o-HfO2 and m-HfO2 in the sample, mainly o-HfO2.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期970-976,共7页
Journal of Inorganic Materials
关键词
化学沉淀法
HfO2纳米粉体
团聚体
烧结
chemical precipitant method
non-agglomerate
HfO2 nano powder
sinter
