低温燃烧法制备Nd:YAG透明激光陶瓷粉体

Preparation of Polycrystalline Nd:YAG Nanopowders Used for Sintering Transparent Laser Ceramics via Low-Temperature Combustion Method

以硝酸盐和柠檬酸为初始原料,用低温燃烧法制备出掺钕钇铝石榴石(Nd:Y3Al5O12,Nd:YAG)多晶超细粉体,并采用XRD,SEM等测试手段对粉体的结构和形貌进行了表征。结果表明,在950℃煅烧2h得到了结晶性能良好的Nd:YAG超细粉体,该粉体分散均匀、粒级分布窄、平均粒度为50nm。上述粉体加入0.5%正硅酸乙酯成型后,采用SPS于1600℃,30MPa下烧结5min后相对密度达98.5%,晶粒尺寸在1μm左右,显微结构均匀,气孔率低。

Polycrystalline ultrafine neodymium-doped yttrium aluminum garnet （Nd ： Y3Al5O12, Nd ： YAG） powders were prepared via a low-temperature gel combustion method using nitrates and citric acid as starting materials. The evolution of phase composition and morphology of the powders were characterized by Xray powder diffraction and scanning electron microscopy （ SEM ）. Well-crystallized Nd ： YAG nano-sized powders could be obtained at 950 ℃ for 2 h. The re-sultant powders were well dispersed, and had a relatively narrow size distribution with an average particle size of approximately 50 nm. These powders could be densified to 98.5 % of the theoretical density by SPS at 1600℃for 5 min under 30 MPa pressure. SEM morphologies showed that the sintered Nd：YAG ce- ramics with average grain size at about 2μm had ho- mogeneous micro-structure and low pore volume.