工艺参数对Nd:YAG烧结致密化的影响

以高纯Y_2O_3、Al_2O_3和Nd_2O_3粉体为原料,少量纳米SiO_2为烧结助剂,采用真空烧结方法制备致密的Nd:Y_2Al_5O_(12)(Nd:YAG)陶瓷,并研究球磨处理原料粉体、Y_2O_3原料颗粒度和烧结气氛对Nd:YAG烧结致密化的影响.结果表明,机械合金化氧化物混合粉体,可明显细化氧化物颗粒,促进Nd:YAG的烧结.在1600℃保温8h,对球磨20h的粉体压坯真空烧结得到的Nd:YAG块体相对密度达99%,晶粒大小约为10μm;采用纳米Y_2O_3,粉体作真空烧结原料,可提高烧结活性,获得细晶和高致密度的Nd:YAG陶瓷,对混合粉体球磨20h压坯烧结可得到晶粒大小为2μm、相对密度为98.5%的Nd:YAG块体;在氩气保护下常压烧结,得到的Nd:YAG块体组织难以辨认,而且残留许多孔隙.

Effect of Processing Parameters on Sintering Densification of Nd:YAG

Neodymium doped Yttrium aluminum garnet(Nd:YAG)ceramics were fabricated by vacuum sintering with Y_2O_3,Al_2O_3)and Nd_2O_3 powders as raw materials,using nano-meter SiO_2 as sintering aid.The effects of ball milled powders,grain size of Y_2O_3 raw materials and sintering atmosphere on sintering densification ofNd:YAG were investigated.The msults show that the mechanical alloying of oxides mixed powders may obviously refine oxide particles and then enhance the process for sintering Nd:YAG.At 1600℃ for 8h.the relative density of the bulk sintered with the powders ball milling for 20h is 99%,and it has a crystalline size of 10μm;using nano-meter Y_2O_3 powders as raw materials,sintering reactivity enhances.So fine crystalline and high density of Nd:YAG ceramic Was obtained.The relative density of this bulk sintered with powders ball milling for 20h is 98.5%.and it has a crystalline size of 2 μm.Sintering in Ar atmosphere,microstmcture of Nd:YAG bulk is difficult to discern and remains many pores.