The Synthesis And Analysis Of Nano YAG Powders With High Performance

Yttrium aluminum garnet (YAG) crystalline ceramic which has excellent optical, mechanical, thermodynamic properties has been widely studied to replace YAG single crystal to be the new solid laser material. The dispersibility and sinterability of YAG powders have important effect to performance of product ceramic, so synthesis and sinter techniques are the key factor of powder preparation. The common ways such as co-precipitaiton, sol-gel, et al. can obtain nano-scaled YAG powders, but severe aggregation is unavoidable. Otherwise, supercritical fluid technique is a potential way for drying nano powders, which can effectively extract the solvent in precursor, avoid aggregation of powders.In this study, precursors obtained by homogenous precipitation method and sol-gel method were dried by supercritical fluid ethanol drying technology respectively to gain the well-dispersed, high actived powder, moreover improve the optical performance of product. One of YAG precursors was homogenous precipitated from a mixed solution of aluminum and yttrium nitrates using urea as precipitant, while the other precursor was obtained using Y(Ac)3 and isopropyl alcohol aluminum as raw materials. The phase transformation, composition and micro-structural features of the products were characterized by XRD, TG/DSC, BET, IR and TEM techniques. It was found that precursor...