共沉淀法制备YAG粉体

发布时间：2018-01-22 17:08

  本文关键词： 共沉淀法 YAG 透明陶瓷　出处：《东北大学》2011年硕士论文　论文类型：学位论文

【摘要】：钇铝石榴石(Y3Al5O12,YAG),由于其优越的化学稳定性、光学和机械性能而作为一种重要的陶瓷材料。它可以被用作电子器件的耐热涂层和掺杂稀土离子的基体用作固体激光器工作物质。近年来,作为YAG单晶的替代品YAG多晶透明陶瓷受到了广泛的关注。目前,YAG粉体的合成方法主要有固相反应法,共沉淀法,溶胶-凝胶法,其中因为共沉淀法工艺简单、比较易于控制,因此被广泛应用于YAG陶瓷的制备。 本论文以硫酸铝、硝酸、氧化钇和碳酸氢铵为原料,采用共沉淀法制备YAG纳米粉体,制备的粉体颗粒直径大约为50nm,粉体呈椭球形。 通过在主盐溶液中加入分散剂硫酸铵的方法可改善粉体的分散性。随着硫酸铵加入量的加大,前驱体1100℃煅烧4h后的YAG粉体分散性越来越好,当分散剂硫酸铵铵的加入量为0.030mol时制备的YAG粉体分散性最好,此时粉体的烧结性最好；时效时间对粉体性能的影响不大；滴定速度对粉体性能的影响较显著,随着滴定速度的增加,制备的粉体过渡相越来越少,当滴定速度为50ml/min时,粉体主要为YAG相,粉体的烧结性较好,试样1650℃真空烧结后透光率达到20%以上；且随着滴定速度的加大,粉体颗粒变小；前驱体的不同清洗工艺可影响其性能,当清洗工艺为三遍去离子水+无水乙醇+丙酮时,得到的粉体烧结性能较好；而清洗工艺为去离子水洗三遍+无水乙醇+硬脂酸乙醇溶液,得到的粉体分散性较好；加入助烧剂可改善YAG粉体的烧结性。助烧剂TEOS添加量为理论YAG粉体总量的0.5%的粉体比TEOS添加量理论YAG粉体总量的0.3%烧结性好,TEOS的添加量为0.5%时较佳。
[Abstract]:Yttrium aluminum garnet (Y3Al5O12) has excellent chemical stability due to its excellent chemical stability. As an important ceramic material, optical and mechanical properties can be used as heat-resistant coatings of electronic devices and substrate doped with rare earth ions as working materials for solid-state lasers in recent years. As a substitute for YAG single crystal, YAG polycrystalline transparent ceramics have been paid more and more attention. At present, the main synthesis methods of YAG powder are solid state reaction, coprecipitation and sol-gel method. Because the coprecipitation process is simple and easy to control, it is widely used in the preparation of YAG ceramics. In this paper, YAG nanocrystalline powders were prepared by co-precipitation method using aluminum sulfate, nitric acid, yttrium oxide and ammonium bicarbonate as raw materials. The diameter of the powders was about 50 nm and the powder was ellipsoidal. The dispersity of YAG powders can be improved by adding ammonium sulfate into the main salt solution. With the increase of the amount of ammonium sulfate, the dispersity of YAG powders calcined at 1100 鈩，

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