Preparation technology of hydroxyapatite-containing composite biological film on titanium-base surface

Abstract

The invention discloses a preparation technology of a hydroxyapatite-containing composite biological film on a titanium or titanium alloy surface. Firstly, a calcium-phosphorus-containing micro-arc oxidation biological film is prepared on the titanium or titanium alloy surface by means of micro-arc oxidation, then titanium or titanium alloy with the calcium-phosphorus-enriched biological film on the surface is subjected to microwave hydrothermal treatment through a microwave technique, and accordingly the hydroxyapatite-containing composite biological film can be generated on the titanium-base surface. The composite biological film is of a three-layer structure, the inner layer is dense titanium dioxide, the middle is a porous structure, and the surface layer is nano-fibrous hydroxyapatite. The hydroxyapatite-containing composite biological film is prepared on the titanium-base surface by the aid of a two-step method, so that bioactivity of the titanium or titanium alloy is improved obviously; besides, the hydroxyapatite-containing composite biological film has high bonding strength since the film grows in situ from the titanium-base surface and is bonded with a titanium base in an indented manner; more importantly, by the adopted microwave technique, hydrothermal temperature is lowered remarkably, reaction time is shortened greatly, and the preparation technology is suitable for industrial processing and production.

Description

technical field [0001] The invention belongs to the technical field of surface modification of titanium and titanium alloys thereof, and specifically relates to a preparation process for rapidly preparing a hydroxyapatite-containing composite biofilm on a titanium-based surface through micro-arc oxidation-microwave hydrothermal technology. Background technique [0002] Titanium and titanium alloys are currently the most widely used metal implant materials in the field of surgery because of their low density, high strength, similar specific gravity to human bone tissue, and good biocompatibility. Internal fixation devices such as joints, fracture bone plates, screws and intramedullary nails, dental implants, denture brackets, crowns and bridges, and orthodontic arch wires used in stomatology. At present, research on titanium and titanium alloys has become a hotspot in orthopedics, oral cavity, orthopedics and the entire medical field. However, titanium and titanium alloys ar...

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Problems solved by technology

However, titanium and titanium alloys are not perfect, and there are some disadvantages: (1) lack of biological activity, cannot induce calcium and phosphorus salt deposition, and cannot form a strong chemical bond with the surrounding bone tissue, so the implant is easy to loosen; (2) ) poor wear resistance, easy to produce aseptic inflammation; (3) easy to produce stress concentration and cause adverse consequences such as bone resorption around the implant, these shortcomings limit its further application in the medical field, therefore, titanium and titanium must be alloy surface modification

[0004] At present, the surface modification technology of titanium or titanium alloy mainly includes coating-sintering method, plasma spraying, electrochemical deposition, sol-gel, laser cladding, ion implantation, sintering low-temperature combustion method, ion sputtering method, etc., but These methods have different defects and cannot fully meet the clinical needs. For example, the bonding strength between the coating and the substrate of the coating-sintering method is poor, and the coating is easy to crack and peel off; plasma spraying is expensive, and it is difficult to achieve a uniform coating. , easy to produce impurity phases, and the coating structure is low in density, which is easy to cause coating peeling; the bonding force between the electrochemical deposition coating and the substrate is low; the sol-gel method is easy to crack during the gel drying process, and it is difficult to A thicker coating is obtained; the uniformity and stability of the laser cladding method are difficult to control; the deposition time of the bionic solution method is longer, etc.

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