摘要
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 5 6 %、烧结时间缩短了 3h、致密化温度降低 2 0 0℃ .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 5 0— 6 0nm .
Nano-scale ZnO green disks are prepared by continuous compaction process. Relation between green density, sintering time I 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 green density is increased by 56%, sintering time is decreased by 3 h and densification temperature is decreased by 200° C 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 microscopy. Hardness values imply that the relation between micro-hardness and sintering temperature is not monotonic, but first increasing then decreasing with increasing sintering temperature in the ZnO nano-bulk. The grain size at the inflexion point is about 50-60 nm.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第5期2409-2413,共5页
Acta Physica Sinica
基金
河北省自然科学基金 (批准号 :B2 0 0 40 0 0 189)资助的课题 .~~
