摘要
以碳酸氢铵为沉淀剂,硝酸盐为原料,采用沉淀法,通过仔细控制沉淀过程的工艺参数,得到了煅烧后可直接生成纯相YAG的前驱体沉淀物,前驱体经过900℃煅烧即可获得纳米YAG粉体。BET,TEM和XRD的测试结果表明纳米YAG粉体的晶粒尺寸为67～175nm,晶粒形态为球形,分散性良好。粉体达到完全致密化的最低烧结温度为1450℃。所获得的粉体经过1700℃真空烧结3h,烧结体具有一定的透明度。研究表明,这种纳米YAG粉体所具有的良好烧结活性与粉体的纳米晶粒尺寸,球形晶粒形态及极佳的分散性有关。
Ammonium hydrogen carbonate was used as the precipitant to synthesize yttrium aluminate garnet (YAG) precursors from a mixed solution of aluminum and yttrium nitrate via coprecipitation. The pure YAG phase was produced by calcining the precursor at 900°C without the formation of intermediate phase. Analyses of the powders were carried out using BET, TEM and XRD. It is found that the particle of the YAG powder is uniform in size, sphere morphology and less agglomeration. The YAG powder is sintered and can be densified to transparency under vacuum at 1700°C for 3 hours without additives. The results indicate that the nano-sized, spherical particles and good dispersity of the YAG powder are responsible for the excellent sinterability.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2005年第2期48-50,共3页
Journal of Materials Engineering
关键词
YAG
纳米粉
沉淀法
透明陶瓷
yttrium aluminate garnet
nano-sized powders
coprecipitation
transparent ceramics
