【摘要】 采用水/环己烷/Triton X-100/正己醇四元油包水体系,通过微乳液法制备了纳米ZrO₂粉体,用XRD、TEM、TG-DTA等对所制备的纳米粉体进行了表征,并重点研究了体系中增溶的锆盐溶液浓度对ZrO₂纳米粒子结构与性能的影响。结果表明,本方法所制备的纳米单斜相ZrO₂粉体,其晶粒尺寸可控制在15 nm左右;在479℃左右,纳米粉体由无定形转变为晶相;在较低的煅烧温度下,所合成的氧化锆粒子中同时存在着单斜相和四方相两种晶粒,随着煅烧温度的提高,部分四方相会转变为单斜相,到煅烧温度为800℃时,几乎全部转化为单斜相:随着锆盐浓度的增加,所合成粉体的晶型没有太大的变化,均为单斜相,但是晶体结构的完整性略有不同;随着锆盐浓度的增加,所合成粉体的晶粒尺寸有所增大,团聚现象亦有所加重。更多还原

【Abstract】 Zirconia nano-powder was prepared by microemuision process with the water-in-oil system of water/cyclohexane/Triton X-100/hexyl alcohol.The as-prepared nano-powder was characterized by XRD,TEM and TG-DTA.The influence of concentration of zirconium oxychloride on the structure and properties of zirconia nano-particle was specially investigated.The results show that the size of m-ZrO₂ nano-particle could be controlled in about 15 nm.The amorphous nano-powders crystallized at the temperature about 479℃.At lower calcination temperature,the ZrO₂ nano-particles were the mixture of monoclinic zirconia and tetragonal zirconia.With the increase of the calcination temperature,part of the tetragonal zirconia was transferred to monoclinic zirconia.And almost all the tetragonal zirconia was transferred into monoclinic phase when temperature rose to 800℃.In addition,with the increase of the concentration of zirconium oxychloride,the size of the nano-particle was increased and agglomeration was also aggravated.更多还原