Preparation method for preparing titanium oxide bioactive coating on the surface of nitinol alloy

Abstract

A preparation method for preparing titanium oxide bioactive coating on the surface of nitinol alloy belongs to the technical field of material science and engineering and relates to a method for preparing titanium dioxide coating on the surface of nitinol alloy by a composite coating technique. The preparation method is characterized in that firstly, the voltaic arc ions of the nitinol alloy are titanized, and then differential of arc oxidation treatment is carried out. In the metallic-membrane plating stage, pure titanium is selected as cathode target material, the arc current is 60-120A, and the negative bias is pulse form; in the micro-arc oxidation stage, the titanized nitinol alloy is taken as anode to be hung to electrolyte; the cathode is a stainless steel electrolyte groove or stainless steel sheets hung in the electrolyte; the bipolar pulse power source is adopted for the micro-arc oxidation treatment; the adopted electrolyte comprises calcium acetate, monosodium orthophosphate and water; TiO2 microporous coatings containing calcium and phosphorus are prepared on the surface of the nitinol alloy so as to increase the bonding force of the biological activity of nitinol alloy embedded material with the bone and are particularly suitable for being applied in the field of the embedded material of human body hard tissues.

Description

technical field [0001] The invention belongs to the field of material science and engineering technology, and relates to a method for preparing a titanium oxide bioactive coating on the surface of a nickel-titanium shape memory alloy (NiTi), in particular to a composite coating combined with arc ion titanium plating and micro-arc oxidation. A method for preparing calcium and phosphorus-containing microporous titanium dioxide coatings on the surface of NiTi. Background technique [0002] Nickel-titanium shape memory alloys are widely used as hard tissue implant materials in the human body. However, there are problems such as low bone bonding strength, poor biological activity, and long healing time when they are implanted into the human body. Surface modification of nickel-titanium alloy to form a modified coating with good biological activity and high interfacial bonding strength is an effective way to solve the problem. Calcium and phosphorus are important inorganic compon...

AI Technical Summary

Problems solved by technology

[0003] Micro-arc oxidation (MAO) is a method for preparing microporous oxide coatings on metal surfaces. This method can prepare porous coatings mainly composed of base metal oxides and form a high-strength metallurgical bond with the substrate. The atomic ratio of Ni and Ti in the shape memory alloy is close to 50%. Ni is not a valve metal, and its oxide film is unstable, so it cannot be directly applied to the micro-arc oxidation process to prepare the coating.

At present, there is no report on the preparation of titanium dioxide microporous coatings containing calcium and phosphorus on the surface of nickel-titanium alloys directly by micro-arc oxidation at home and abroad.