共沉淀法制备掺钕钇铝石榴石透明陶瓷:滴加方式的影响

Fabrication of neodymium-doped yttrium aluminium garnet transparent ceramics by co-precipitation:The effect of titration precipitation method

用共沉淀法正滴和反滴工艺制备了掺钕钇铝石榴石(Nd:YAG)粉体。测试了粉体的相组成、显微形貌、粒度分布。结果表明:经1100℃煅烧后,正滴工艺得到粉体主相为YAG(Y3Al5O12),但有少量的YAM(Y4Al2O9),反滴工艺则得到纯的YAG。晶粒尺寸分别为24.7 nm和26.6 nm,平均粒径分别为1.26μm和1.86μm,前者的粒径分布要窄,分散性要好。采用真空烧结技术在1800℃烧结制备了Nd:YAG陶瓷,正滴工艺制备YAG陶瓷晶粒间存在少量气孔,反滴工艺样品存在少量大的孔洞和许多晶界气孔。厚1 mm抛光样品在1064 nm处透过率分别为72%和42%,在400 nm处分别为65%和35%。

Neodymium-doped yttrium aluminium garnet（Nd：YAG）powders were synthesized by co-precipitation with forward-titration and reverse-titration,respectively.The phase composition,morphology,particle size distribution of the powders were determined.The powder obtained by forward-titration was of major-phase YAG and a trace amount of YAM with a grain size about 24.7 nm,while the powder by reverse-titration was of pure-phase YAG with a grain size 26.6 nm.The average particle sizes of these powders were 1.26 ？m and 1.86 ？m respectively.The former was well dispersed with a narrow size distribution.Nd：YAG transparent ceramic was sintered at 1800 ℃ in vacuum.A few pores were observed in the forward-titration sample as compared with a few big holes and more pores at the grain boundaries of the reverse-titration sample.The transmission of the polished samples with thickness of 1mm were 72% and 42% at 1064 nm,65% and 35% at 400 nm respectively.