Preparation Technology Research Of YAG Laser Transparent Ceramic Powder

YAG laser transparent ceramic is a new strategic laser work material, while preparation of YAG nano-powder is premise and key to the preparation of transparent ceramic. This paper used the chemical coprecipitation and sol-gel method for YAG nano-powder, and particularly researched the influence of different processing conditions in growth of powder, in order to acquired a comparatively perfect best technological conditions. In the meanwhile,discussed the influence of different doping element and doping quantity to the luminescent properties of powder.1. Selected different precipitation agent, solvents and surfactant to prepare YAG nano-powder by chemical coprecipitation method. The experimental results showed that, we can geted the powder was pure YAG phase, good dispersion, no reunion, particle size distribution uniformity, in the around of 100 nm, approximately spherical shape when choosed ammonium bicarbonate as the precipitation agent, and the concentration ratio of precipitation agent solution and metal ion mixed solution is 10:1, choosed that the volume ratio of ethanol-water mix system is 1:2 as solvent, added accounted for 4% polyethylene glycol (PEG) 400 solution of the volume of mixed solution as surfactant.2. Complexing agent, solution pH value and surfactants had significant effect to YAG nano powder which preparated by sol-gel method. Research findings showed that, the best technological conditions is that choosed citric acid as complexing agent, and the molar ratio of citric acid and metal ion was 6:5, pH value of mixed solution was controled in 2.0, added accounted for 8% polyethylene glycol (PEG) 400 solution of the volume of mixed solution as surfactant. The preparation of the powder had pure YAG phase, good dispersion, no reunion, particle size distribution uniformity, in the around of 85 nm, approximately spherical shape.3. Different doping element and concentration had some degree of influence on the luminescent properties of YAG powder. The experimental results showed that emission peak position of doped YAG powder prepared by the condition in this study unchanged.The fluorescence intensity of powder was the largest when respectively single added 5% Yb or 3% Nd; while fixed Yb doping content at 5%, fluorescence intensity changed with the change of Cr powder doped quantity, and fluorescence intensity of powder was the largest when Cr doping content is 0.4%; while fixed Nd doping content at 3%, fluorescence intensity also changed with the change of Cr powder doped quantity, and fluorescence intensity of powder was the largest when Cr doping content is 0.8%.