METHOD OF PRODUCING COMPOSITE MATERIAL FOR BIORESORBABLE MAGNESIUM IMPLANT Russian patent published in 2019 - IPC A61L27/00 A61L27/04 A61L27/34 A61L27/40 A61L27/56 A61F2/02 C25D11/30 C25D9/12 G06T17/00 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing a material with a composite anticorrosion coating for biocompatible implants with a limited period of stay in the body, serving for replacement and/or regeneration of damaged bone tissues, and can be used in implantation surgery. Proposed method is implemented by powder laser surfacing in protective gas medium with application of 3D printing controlled by software. Magnesium powder is converted into molten metal by means of laser beam immediately before application onto substrate or previous layer, note here that build-up is performed layer-by-layer, wherein each layer is applied in several passes of laser beam with formation of solid layer of magnesium metal from successively deposited tracks. Then, plasma-electrolytic oxidation of fused material is performed in bipolar mode: potentiostatic at voltage 370–390 V during anode polarization of material surface and galvanodynamic at current varying from 11 to 7 A at scanning rate minus 0.04 A/s, during cathode polarization, in electrolyte containing, g/l: calcium glycerophosphate C₃H₇CaO₆P 20–30, sodium fluoride NaF 4–7 and sodium silicate Na₂SiO₃ 7–10, to obtain hydroxyapatite Ca₁₀(PO₄)₆(OH)₂ layer. After that, ultrafine polytetrafluoroethylene is deposited on the surface of the obtained layer by 4-fold immersion in its 15 % suspension in isopropyl alcohol. After each dipping, air-drying and heat treatment of applied layers of UPTFE at 310–320 °C for 10–15 minutes.

EFFECT: simplification of the method due to reduction of number of stages, reduction of labor costs and power consumption for its implementation, reduction of reagents consumption with simultaneous improvement of biocompatibility of the obtained composite material.

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