论文部分内容阅读
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 as raw materials, chemical precursors precipitation method, and then heat treatment to produce nano-zirconia powder. The obtained precipitate was amorphous, and its differential thermal analysis showed that amorphous zirconia powder was obtained by heat treatment at 300 ° C, and the powder was completely crystallized into a metastable tetragonal phase at 450 ° C. At the same time, the X-ray diffraction spectrum shows that the zirconia powder obtained by heat treatment at 600 ℃ for 1 h is a metastable tetragonal phase, and stable monoclinic phase begins to appear at 700 ° C., and the content of monoclinic phase increases with the increase of holding time . The powder obtained by this method is a nanophase. The particle size increases with the increase of the heat treatment temperature and increases in a quadratic function, and increases with the increase of the holding time.