Process for preparing compact magnesium oxide/hydroxyapatite nano fiber double-layer coating on surface of magnesium base
A hydroxyapatite and nanofiber technology is applied in the field of preparation of biomedical materials, which can solve the problems of difficulty in blocking body fluid infiltration, low matrix bonding strength and low capacity, and achieves high bonding strength, low price, and early fixation. Effect
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[0024] Example 1
[0025] The configuration contains 0.0137M Ca(OH) 2 , 0.02M β-GP and 0.125M NaOH aqueous solution as electrolyte, with magnesium or magnesium alloy as anode, stainless steel as cathode, using pulse power supply, at constant voltage of 450 volts, initial current density of 2.6 mA / mm2, The micro-arc oxidation treatment was carried out for 10 minutes under the conditions of a frequency of 100 Hz, a duty cycle of 26%, and a spacing of 8 cm between the cathode and anode plates to obtain a phosphorus- and calcium-containing porous magnesium oxide coating with a thickness of 15 μm. The SEM pictures of its surface and cross-section micro-morphology refer to figure 1 and figure 2 .
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[0026] Example 2
[0027] Porous magnesium oxide coatings containing phosphorus and calcium were prepared as in Example 1.
[0028] Add Ca-EDTA with a concentration of 0.05M and a mixed aqueous solution of 0.5M NaOH into the autoclave, and place the phosphorus- and calcium-containing porous magnesium oxide coating formed by micro-arc oxidation in it, and hydrothermally treat it at a temperature of 90 ° C for 24 hours . A nanofibrous hydroxyapatite layer grows on the surface of the porous magnesium oxide, and the nanofibers are hexagonal prisms with a length of about 330.4 nanometers and a diameter of about 193 nanometers. After the composite process of micro-arc oxidation and hydrothermal treatment, the phase composition of the obtained double-layer structure coating is magnesium oxide, magnesium hydroxide and hydroxyapatite.
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[0029] Example 3
[0030] Porous magnesium oxide coatings containing phosphorus and calcium were prepared as in Example 1.
[0031] The Ca-EDTA with a concentration of 0.1M and the mixed aqueous solution of 0.5M NaOH were added to the autoclave, and the phosphorus- and calcium-containing porous magnesium oxide coating formed by micro-arc oxidation was placed in it, and hydrothermally treated at a temperature of 90 ° C for 2 hours . The surface layer of the porous magnesium oxide forms a lamellar magnesium hydroxide, and the magnesium hydroxide has a sealing effect on the conductive through holes formed by the micro-arc oxidation treatment. After the composite process of micro-arc oxidation and hydrothermal treatment, the phase composition of the double-layer structure coating is obtained as magnesium oxide and magnesium hydroxide. Its surface micro-morphology and phase composition refer to image 3 and Figure 4 .
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