柠檬酸法、氨水沉淀法和碳酸氢铵沉淀法制备的钇铝石榴石纳米粉体性能的比较  

COMPARISON FOR PROPERTIES OF YTTRIUM ALUMINUM GARNET NANO-SIZED POWDER PREPARED BY DIFFERENT METHODS

作　　者：丁志立[1] 陈嵩[1] 韩杰才[1] 

机构地区：[1]哈尔滨工业大学复合材料研究所,哈尔滨150001

出　　处：《硅酸盐学报》2005年第3期380-385,共6页Journal of The Chinese Ceramic Society

摘　　要：采用3种方法制备了纯相钇铭石榴石(yttriumaluminumgarnet,YAG)纳米粉体。对不同方法制备的粉体的物理性能、素坯的微观 特征、烧结性能和烧结体的透明性能进行了比较。结果表明:柠檬酸法制备的粉体,晶粒形状不规则,且有团聚体存在,该粉体的素坯显微结构 不均匀,粉体烧结活性很差,1780℃保温3h烧结的样品的相对密度仅为79%,烧结体不透明。氨水沉淀法制备的粉体,晶粒尺寸较小,素坯 的显微结构也不均匀,粉体烧结性能较好,达到完全致密化的温度为1700℃,此粉体经过1700℃保温3h真空烧结制备的烧结体呈半透明。 碳酸氢铵沉淀法制备的粉体,晶粒形状为椭球形,分散性良好,该粉体素坯的显微结构均匀,样品达到完全致密化的温度仅为1450℃,此种粉 体所制成的素坯经过1700℃保温3h真空烧结后,烧结体具有一定的透明度。因此,碳酸氢铵沉淀法制备的YAG纳米粉体有希望成为比较 理想的制作透明YAG陶瓷的粉体。High-purity yttrium aluminum garnet (YAG) nano-sized powders were synthesized by using 3 different methods, Powder characteristics, microstructure of compacts and sintering ability of the YAG powders prepared by different methods were compared. Results show that the powder prepared by citric-gel route consists of irregular shape grains and has much agglomeration. The powder compacts show very bad particle packing, and poor sinterability, which leads the powders to be densified to 79% only after sintered at 1780°C for 3 h. For YAG powders prepared via precipitation using ammonia water as precipitant, the particle packing of compacts is poor, but the sintering ability is good and the sintered ceramics tends to full density at 1700°C. The particle size of the YAG powder obtained from precipitation method by using ammonium hydrogen carbonate as precipitant is uniform with elliptic shape and good dispersion. Nearly theoretical density of the samples were obtained at sintering temperatures as low as 1450°C. A transparent YAG sample can be obtained after vacuum sintering at 1700°C for 3 h by using the powder precipitated by ammonium hydrogen carbonate as precipitant.

关 键 词：钇铝石榴石 纳米粉 无压烧结 烧结性能 透明陶瓷 

分 类 号：TB383[一般工业技术—材料科学与工程]