(1. 东北大学 材料与冶金学院 材料各向异性与织构教育部重点实验室，沈阳 110004；
2. 辽宁科技学院 冶金系，本溪 117004)
摘 要: 分别添加0.3%~3.0%(质量分数)的正硅酸乙酯(TEOS)为烧结助剂，利用液相烧结合成钇铝石榴石(Y3Al5O12，YAG)透明陶瓷。结果表明：液相生成是一种动态过程，最低形成温度约为1 400 ℃。烧结体相对密度随着烧结温度的升高而明显增大，且烧结助剂对致密化过程的促进作用与其含量有关。当w(TEOS)≤0.5%时，TEOS能够更明显地促进烧结，TEOS含量对真空烧结后烧结体内残留硅酸盐相的数量、分布和显微结构产生很大的影响。当w(TEOS)≤0.5%时，Y2Si2O7与Al2O3∙SiO2(MUL)固溶于YAG晶粒内，晶界处没有残留第二相；当w(TEOS)为2%和3%时，过量的Y2Si2O7与MUL在晶界析出而成为散射源，严重损害陶瓷的光学性能。
关键字: YAG透明陶瓷；液相烧结；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)
