摘要
以氯氧锆、脲和氨水为原料，用化学沉淀法制作先驱体，然后热处理来制作纳米氧化锆粉末。所得到的沉淀物为非晶态，其差热分析结果显示，在300℃热处理即可得无定型氧化锆粉末，该粉末在450℃则完全晶化为亚稳四方氧化错相。同时，X射线衍射谱显示，在600℃以下热处理1h所得的氧化锆粉末为亚稳四方相，到700℃时开始出现稳定的单斜相，并且单斜相的含量随保温时间的延长而增加。用此方法制得的粉末为纳米相，粒径随热处理温度的增加而成二次函数关系增大，随保温时间的延长而成线性关系增大。
Zirconium oxychloride, urea and ammonia have been used to produce the precursor by the precipition method. The precur' sor was heat-treated to obtain the zirconia powders. Differential thermal analysis shows that the precursor changes into amorphous zirconia at 300C, and then transforms to tetragonel zirconia at 450C. The processes are endoergic and exoergic, respectively. XRD analysis shows that the monoclinic zirconia not can be obtained below 700C. The content of monoclinic zirconia increases as the calcination time increases. The zirconia powders so obtained are nanostructured. The size of the powders increases quadratically with the calcination temperature. The particle size increases linearly with calcination time.Correspondent: Liao Shuzhi, Doctor, Associate Professor, Department of Physics, Hunan Educational institute, Changsha 410012,P. R. China, Tel: 086 - 731 - 8826401
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1998年第5期309-312,共4页
Rare Metal Materials and Engineering
基金
湖南省教委资助
关键词
热处理
粒度
相结构
纳米粉末
二氧化锆
nanostructured ZrO_2 powders, thermal treatment, size, phase structure
