Method for preparing hydroxy apatite biological ceramic coating containing fluorine

Abstract

The invention discloses a method for preparing a hydroxy apatite biological ceramic coating containing fluorine. The method comprises the steps of evenly mixing 2.3% of calcium fluoride powder by weight and 97.7% of hydroxyapatite powder by weight, utilizing polyving akohol solution with concentration of 2% to serve as binder to allocate the mixed powder, presetting the allocated mixed powder on a titanium alloy base plate, and utilizing a carbon dioxide laser to perform broadband laser cladding on the titanium alloy base plate to generate the hydroxy apatite biological ceramic coating containing the fluorine, wherein the cladding process adopts two process parameters as follows: the laser output power P of the carbon dioxide laser ranges from 0.5kW to 1kW, the scanning speed V ranges from 150nm / min to 250nm / min, the rectangular spot dimension D is 15mm*2mm, and argon shield is adopted. By means of the method, good biological activity of the ceramic coating and high strength and good toughness of metal are combined together, and the hydroxy apatite coating containing the fluorine can protect the titanium alloy base plate from being corroded by the human physiological environment. Besides, the coating and the metal of the base plate are combined through the laser cladding preparation technique, so that the hydroxy apatite biological ceramic coating containing the fluorine meets mechanical performance requirements of implant materials.

Description

technical field [0001] The invention belongs to the field of bioceramic coating materials, and more specifically relates to a method for preparing a fluorine-containing hydroxyapatite bioceramic coating. Background technique [0002] There are many kinds of artificial biomaterials. Titanium and its alloys and hydroxyapatite are widely used in the research and development of biomedical materials as the metal materials and ceramic materials with the best biological activity respectively. The former produces metal atoms with toxic side effects due to corrosion in the human environment, while the latter limits their applications due to their high brittleness and low strength. Hydroxyapatite coating has high solubility, which reduces its stability and long-term implant performance, and fluorine-containing hydroxyapatite due to the utilization of F - replaces OH - The ingredients that are closer to natural bone can effectively improve the biological activity of hydroxyapatite an...

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Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide a method for preparing fluorine-containing hydroxyapatite bioceramic coating, aiming at solving the problem of poor long-term stability, fast decomposition rate and sol - Problems such as low bonding strength of coatings prepared by gel method, plasma spraying method, etc., using laser cladding method to prepare bioceramic coatings containing fluorine-containing hydroxyapatite on titanium alloy substrates. On the one hand, the ceramic coatings are well The biological activity of the metal is combined with the high strength and good toughness of the metal, and the fluorine-containing hydroxyapatite coating has the function of protecting the titanium alloy substrate from the corrosion of the human physiological environment; on the other hand, the laser cladding preparation technology is used Make the coating and the substrate have a good metallurgical bond to meet the mechanical performance requirements of the implanted material

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