METHOD OF OBTAINING NANODISPERSED METAL OXIDES

摘要

FIELD: chemistry. ^ SUBSTANCE: invention can be used in production of refractory ceramic matrices of composite materials and high-temperature coatings. A solution of -diketonates of one or more metals with concentration of 110-3-1 mol/l in an organic solvent or mixture of solvents in the presence of an alcohol undergoes thermal treatment at 95-250 C for 0.1-8 hours to obtain solutions of alkoxo--diketones of corresponding metals. Hydrolysis is then carried out at 15-95C for 0.05-240 hours with hydrolysing solutions, which are either water, organic solvents or mixture of solvents containing water or a mixture of organic solvents and water to form transparent gels. Further, the gels are dried at 15-250C and pressure of 110-4-1 atm until constant weight. Thermal treatment of xerogels to form nanocrystalline metal oxides is carried out in an oxygen-containing atmosphere at 350-750C for 0.5-24 hours. ^ EFFECT: invention enables to obtain metal oxides in finely dispersed state with narrow particle size distribution with average particle size between 2 and 50 nm using a sol-gel technique. ^ 2 dwg, 1 tbl, 24 ex