(1. 東北大學(xué) 材料與冶金學(xué)院 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110004；
2. 遼寧科技學(xué)院 冶金系，本溪 117004)
摘 要: 分別添加0.3%~3.0%(質(zhì)量分?jǐn)?shù))的正硅酸乙酯(TEOS)為燒結(jié)助劑，利用液相燒結(jié)合成釔鋁石榴石(Y3Al5O12，YAG)透明陶瓷。結(jié)果表明：液相生成是一種動(dòng)態(tài)過(guò)程，最低形成溫度約為1 400 ℃。燒結(jié)體相對(duì)密度隨著燒結(jié)溫度的升高而明顯增大，且燒結(jié)助劑對(duì)致密化過(guò)程的促進(jìn)作用與其含量有關(guān)。當(dāng)w(TEOS)≤0.5%時(shí)，TEOS能夠更明顯地促進(jìn)燒結(jié)，TEOS含量對(duì)真空燒結(jié)后燒結(jié)體內(nèi)殘留硅酸鹽相的數(shù)量、分布和顯微結(jié)構(gòu)產(chǎn)生很大的影響。當(dāng)w(TEOS)≤0.5%時(shí)，Y2Si2O7與Al2O3∙SiO2(MUL)固溶于YAG晶粒內(nèi)，晶界處沒有殘留第二相；當(dāng)w(TEOS)為2%和3%時(shí)，過(guò)量的Y2Si2O7與MUL在晶界析出而成為散射源，嚴(yán)重?fù)p害陶瓷的光學(xué)性能。
關(guān)鍵字: YAG透明陶瓷；液相燒結(jié)；液相含量；Y2Si2O7；3Al2O3·2SiO2
of transparent YAG ceramics doping TEOS
（1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
Northeastern University, Shenyang 110004, China;
2. Metallurgy Department, Liaoning Institute of Science and Technology, Benxi 117004, China）
Abstract:The transparent YAG ceramics were prepared by liquid phase sintering (LPS) with 0.3%~3.0%TEOS (mass fraction) as sintering additive. The results indicate that the formation of the liquid phase is a continous course, and the initial formation temperature for the liquid phase is about 1400 ℃. The relative density of sintered bodies increases with increasing sintering temperature. The different enhanced densification is a result of the different additive content. The sintering process is obviously improved in the doping sample with w(TEOS)≤0.5%. The content of TEOS has a strong inflence on the quantity and distribution of the remaining metasilicate phases and the microstructure of the vacuum-sintered bodies. When w(TEOS)≤0.5%, Y2Si2O7 and Al2O3∙SiO2 (MUL) phases exist in YAG grains and the second phase at the grain boundary is not observed. When w(TEOS) are 2% and 3%, surplus Y2Si2O7 and MUL appear at the grain boundary and become the scattering source to damage the optical performance strongly.
Key words: transparent YAG ceramics; liquid phase sintering; liquid phase content; Y2Si2O7；3Al2O3·2SO2(MUL)
