METHOD OF PRODUCING HIGH-DENSITY VOLUMETRIC CERAMIC ELEMENTS USING ELECTROPHORETIC DEPOSITION OF NANOPARTICLES (VERSIONS) Russian patent published in 2019 - IPC C04B35/626 B82Y40/00 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of ceramic materials and can be used for making high-density, including optical, ceramics. Method of producing high-density volumetric ceramic elements using electrophoretic deposition (EPD) of nanoparticles involves weakly aggregated nanoparticles of oxides obtained by high-energy physical dispersion methods, for example by laser evaporation of material or by electric explosion of conductor. Self-stabilized suspension of nanoparticles dispersed in a mixture of alcohol and acetylacetone is prepared. Concentration of acetylacetone in alcohol is selected proceeding from calculation of mass of acetylacetone per total surface area of nanoparticles in suspension by formula m_Hacac=μ·S_sp·m_np, where μ is mass of acetylacetone per unit surface of nanopowder, mg/m², value of μ is selected so that it is from 0.1 mg/m² up to 10 mg/m² (in most cases 1 mg/m²); S_sp is specific nanopowder surface, m²/g; m_np Is nanopowder weight, g; m_Hacac is mass of acetylacetone, mg. Concentration of nanoparticles in the suspension is selected in range of 0.1 to 10 wt%. During deposition, suspension is pumped from cell bottom for deposition into its upper part. EPD is carried out at constant electric field strength up to 50 V/cm. Obtained sediment is sintered. For EPD pulse voltage is also used in form of saw-tooth unipolar pulses with rate of voltage rise in pulse, controlled from 1*10⁴ V/s to 1*10⁷ V/s, and electric field intensity up to 100 V/cm.

EFFECT: reduced nonuniformity of obtained material, formation of pore compactum.

2 cl, 1 ex