( 1. 北京大學(xué) 化學(xué)與分子工程學(xué)院, 北京 100871;
2. 東北大學(xué) 材料與冶金學(xué)院, 沈陽 110004;
3. 沈陽大學(xué) 機(jī)械工程學(xué)院， 沈陽 110041)
摘 要: 分別以AlCl3和YCl3的混合溶液為母鹽， 碳酸氫銨(AHC)或氨水(AW)為沉淀劑， 采用共沉淀法制備了YAG超微粉。 AHC法得到的沉淀物經(jīng)900 ℃煅燒2 h后， 全部轉(zhuǎn)變?yōu)閅AG相， 沒有YAM和YAP等中間相生成。 1 100 ℃煅燒2 h后獲得的YAG粉體分散性好， 一次顆粒尺寸為80 nm， 具有良好的燒結(jié)活性， 使用0.5%(質(zhì)量分?jǐn)?shù))的正硅酸乙酯(TEOS)作為燒結(jié)添加劑，經(jīng)過1 700 ℃真空燒結(jié)5 h后， 獲得了YAG半透明陶瓷。 AW法煅燒過程中出現(xiàn)了YAP相， 得到的粉體團(tuán)聚嚴(yán)重， 燒結(jié)體密度很低。
關(guān)鍵字: YAG; 透明陶瓷; 納米粉; 濕化學(xué)法
（ 1. College of Chemistry and Molecular Engineering,
Peking University, Beijing 100871, China;
2. School of Materials and Metallurgy，
Northeastern University， Shenyang 110004，China;
3. School of Mechanical Engeering, Shenyang University，
Shenyang 110004，China）
Abstract: By using the mixture of aluminum and yttrium chloride and ammonium hydrogen carbonate (AHC) or ammonia water (AW) as the reagent and precipitants, respectively, the nanocrystalline yttrium aluminum garnet(YAG) powder was synthesized by the co-precipitation method. The precursor obtained through the AHC method completely was transformed to YAG phase after calcining at 900 ℃ for 2 h, and no intermediate YAM or YAP phase was detected during calcining. YAG powders obtained by calcining the carbonate precursor at 1 100 ℃ are well dispersed, the primary particle diameter is about 80 nm and the YAG powders have high sinterability. Translucent YAG ceramics were fabricated after vacuum sintering at 1 700 ℃ for 5 h using 0.5% tetraethyl orthosilicate(TEOS) as sintering aid addition. YAP phase is formed during calcing the hydroxide precursor by AW method. The resultant YAG powders are severely agglomerated and caused low density of the sintered body.
Key words: YAG; translucent ceramic; nanocrystalline powder; wet-chemical method
