An aqueous boehmite sol was prepared by the peptization of Al(OH) 3 . The electrophoretic deposition of boehmite coatings on titanium from the aqueous sol was performed at a constant voltage (from 1.0 to 10 V) and for a constant deposition time (from 10 to 30 min). Increasing the applied voltage and deposition time increased the mass of the boehmite coating. It was shown that boehmite coatings of maximum thickness, low porosity and good adhesion can be formed at lower deposition voltages and longer deposition times. The boehmite powder, obtained by drying the prepared aqueous sol, and the boehmite coatings were thermally treated at 1000°C and 1300°C with a holding period of 1 h at the maximum temperature. X-Ray diffraction analysis of the thermally treated samples confirmed the existence of g-Al 2 O 3 and a-Al 2 O 3 phases, respectively, while scanning electron microscopy revealed the graininess of the structure of the a-Al 2 O 3 coatings treated at 1300°C, indicating a significantly lower sintering temperature of the boehmite coating obtained by electrophoretic deposition.
In this work, the dissolution behavior of a polyphosphate glass, with the composition 45P2O5?3SiO2?25K2O?15CaO?10MgO?ZnO?MnO (mol %), in simulated body fluid (SBF) at a temperature of 37 ?C for different times was studied. Two powder sizes of the glass (granulation: 0.1?0.3 and 0.3?0.65 mm) and the bulk glass were investigated. The dissolution experiments were conducted under stationary conditions. Changes in the normalized mass release, normalized concentration of ions, pH values, and surface morphology were determined as a function of the dissolution time. The initial rates of glass powder dissolution and leaching of ions, as well as the diffusion coefficient of cations and the releasing rate of ions, during the hydrolysis process of glass were determined. It was shown that the investigated phosphate glass dissolves in SBF incongruently, with neither precipitation nor the formation of newly potentially toxic compounds, in a dissolution period 720 h. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 34001 and Grant no. 172004]
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