Hydroxyapatite/zirconia-microfibre composites with controlled microporosity and fracture properties prepared by electrophoretic deposition

摘要: Abstract The stabilisation of hydroxyapatite (HA) particles in dispersions containing 2-propanol and monochloroacetic acid (MCAA) was studied. surface HA (Ca 2+ cations) stabilized by chemical adsorption non-dissociated MCAA molecules via polar Cl atoms followed dissociation (cleavage the protons), which led to negative charging particles. Colloidal were milled for 0, 2 24 h a planetary ball mill before electrophoretic deposition (EPD). electrical conductivity modified adding an indifferent electrolyte (LiCl) obtain crack-free deposits with smooth surface. HA/t-ZrO composites 2, 4, 8 16 wt% zirconia microfibres prepared EPD. decomposed into α-TCP, β-TCP partially substituted calcium phosphate action Li + cations during sintering. Elastic modulus Vickers hardness increased milling time prior EPD decreased quantity deposits, depending on composite density. Fracture toughness twice as high that pure due presence orientated microfibres, finer microstructure, tougher phase pores. two-week soaking simulated body fluid revealed bioactivity all materials.