分散剂对YAG粉末形貌和性能的影响

Effect of dispersant agent on morphology and properties of YAG powders

以硝酸铝[Al(NO3)3.9H2O]和硝酸钇[Y(NO3)3.6H2O]为原料,碳酸氢铵[NH4HCO3]为沉淀剂,PEG400,PEG800和PEG1000等为分散剂,采用正向共沉淀法合成了钇铝石榴石(YAG)前驱体粉末。并用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、粒度测试仪等分析了粉末的形貌和性能。结果表明,分散剂的加入,减少了粉末的团聚现象,而且由PEG400,PEG800分散剂制备的先驱体粉末经1200℃煅烧60min后均能形成纯度较高的YAG相,但PEG1000样品粒度更细,比表面积为1748.78m2/kg,中位径为1.42μm,而前者所得粉末的比表面积分别为29.39和128.60m2/kg,中位径分别为196.14和20.55μm。

Abstract： The YAG precursor powder was synthesized through forward co-precipitation method. The raw material was a mixture of aluminum nitrate and yttrium nitrate, the precipitant was ammonium hydrogen carbonate, and the dispersant agents were PEG400, PEGS00 and PEG1000. The samples were identified with X ray diffractometer, laser particle size analyzer and SEM. It is shown that the dispersant agents can decrease reunion phenomenon of powders, and pure YAG powder is obtained with PEG400 and PEG800 after being calcined at 1200 ℃ for 60 min. On the other hand, the particle size of the powder obtained by PEG1000 is smaller than those by PEG400 and PEG800. The specific surface area of the former is 1 748.78 m2/kg and the av erage particle size is 1.42 btm, those of the latter are 29.39 and 128.60 m2/kg, 196.14 and 20.55 μm respectively.