(1. 遼寧科技學(xué)院 冶金工程學(xué)院，本溪 117004；2. 廈門理工學(xué)院 材料科學(xué)與工程系，廈門 361024；
3. 東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110004)
摘 要: 以Y(NO3)3∙6H2O和Al(NO3)3∙9H2O為原料，尿素為沉淀劑，采用均相沉淀法合成了成分為5[Al(OH)CO3]·3[Y(OH)CO3]的釔鋁石榴石(YAG)先驅(qū)體粉末。在沉淀過程中通過控制硫酸根離子的含量可以避免晶核生長(zhǎng)時(shí)的方向性，有效防止了納米顆粒硬團(tuán)聚的形成，先驅(qū)體顆粒逐漸球化。經(jīng)1 100 ℃煅燒分解，獲得平均尺寸為200~ 400 nm、低團(tuán)聚的高純YAG球形粉體。該粉體經(jīng)模壓成型、1 700 ℃真空燒結(jié)，得到晶粒分布均勻、完全透明的YAG陶瓷。
關(guān)鍵字: YAG球形粉體；均相沉淀；(NH4)2SO4；透明陶瓷
（1. College of Metallurgy Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China;
2. Department of Materials and Engineering, Xiamen University of Technology, Xiamen 361024, China;
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
Northeastern University, Shenyang 110004, China）
Abstract:YAG precursor powders with composition of 5[Al(OH)CO3]·3[Y(OH)CO3] were prepared by a homogeneous precipitation method using Y(NO3)3∙6H2O and Al(NO3)3∙9H2O as the raw materials and urea as the precipitant. During the precipitation process, the hard agglomerates between the nanopowders are prevented by the electrostatic effect and the selective growth of the crystal nucleus is avoided through controlling the content of SO42− ions. The precursor powders can be spheroidized gradually during the chemical reaction. The highly pure and low-agglomerated YAG spherical powders are obtained by calcinating the precursors at 1 100 ℃ and the primary particles are spherical and 200~400 nm in diameter. The powder compact pressed in steel die can be sintered to transparency under vacuum at 1 700 ℃. The fully transparent YAG ceramics exhibit a homogeneous microstructure without any survival pores.
Key words: YAG spherical powders; homogeneous precipitation; (NH4)2SO4; transparent ceramics
