ZnO纳米块体材料的制备及其性能的研究

采用连续成型方式压制了纳米ZnO素坯，考察了素坯密度、烧结时间、致密化温度等参数与 成型方式的关系.用场发射扫描电镜表征了烧结体微观组织特征.测定了ZnO纳米块体材料中 硬度随烧结温度的变化规律.结果表明，采用连续成型方式可使素坯密度提高56％、烧结时 间缩短了3h、致密化温度降低200℃.场发射扫描电镜显示烧结体内部密度及颗粒尺寸分布 均匀.硬度测定结果显示ZnO纳米块体材料中显微硬度随烧结温度的变化不是单调的，而是随 烧结温度的升高显微硬度先升高后降低，拐点对应的晶粒尺寸为50—60nm. 关键词： ZnO纳米块体 连续成型 硬度

Study on preparation and properties of ZnO nano-bulk materials

Nano_scale ZnO green disks are prepared by continuous compaction process. Relation between green density, sintering time, densification temperature and compaction method is examined. Microstructure of the samples is characterized by an XL30S_FEG field esmission scanning electron microscopy. Hardness of the ZnO nano_bulk is measured as a function of sintering temperature. The results show that gree n density is increased by 56%, sintering time is decreased by 3h and densifica tion temperature is decreased by 200℃ after the continuous compaction process. Distributions of density and grain size within the sintered body are homogeneous through examination of the XL30S_FEG field esmission scanning electron microsco py. Hardness values imply that the relation between micro_hardness and sintering temperature is not monotonic, but first increasing then decreasing with increas ing sintering temperature in the ZnO nano_bulk. The grain size at the inflexion point is about 50—60nm.