METHOD FOR PRODUCING TRANSPARENT YAG CERAMICS

摘要

FIELD: photonics; laser technology.;SUBSTANCE: invention relates to a method for producing transparent ceramics of yttrium-aluminum garnet (hereinafter – YAG), including those doped with neodymium ions, for use as an active medium in the field of photonics and laser technology. The method for producing transparent YAG ceramics includes a joint high-energy grinding in ethanol of the initial powders of Y2O3, Nd2O3 and Al2O3 oxides to form a weakly aggregated powder system of YAG stoichiometry with a particle size in the range of 50-500 nm, drying at a temperature of 70ºC for 24 hours, followed by granulation of the powder through a sieve with an effective cell size of 200 mesh and annealing in an air atmosphere at a temperature of 600ºC for 4 hours, spark plasma sintering of the resulting material at the first stage by heating at a speed of 100ºC /min to 1000ºC, shutter speed, annealing of the obtained sample in an air atmosphere. The method differs in that the high-energy grinding in ethanol of the powders of the initial oxides Y2O3, Nd2O3 and Al2O3 is carried out using LiF as a sintering additive in an amount of 0.2 wt.% at 300 rpm for 12 hours. Spark plasma sintering is carried out at an external pressure of 50-70 MPa, and at the second stage at a speed of 25ºC min to 1475ºC with the material holding at this pressure and temperature for 45-60 minutes. Annealing of the resulting sample is carried out for 10 hours at a temperature of 900-1000ºC, followed by natural cooling. In addition, the annealing of the resulting sample is carried out at an average heating rate of 10ºC /min. ;EFFECT: technical result is expressed in the production of monophasic ceramics YAG:Nd with increased optical transparency while maintaining high mechanical characteristics.;2 cl, 1 dwg, 1 tbl