Preparation method of hydroxylapatite coating on surface of titanium alloy matrix

Abstract

The invention relates to a preparation method of a hydroxylapatite coating on the surface of a titanium alloy matrix. The preparation method comprises the following steps: firstly respectively performing gas atomization pelleting treatments on titanium powder and hydroxylapatite powder, then uniformly mixing the titanium powder with hydroxylapatite powder, on which the gas atomization pelleting treatments are performed, so as to obtain mixed powder of which the particle size is 10-30 [mu]m, and the content of the hydroxylapatite powder in the mixed powder is 60%-80%; secondly, performing abrasive blasting roughening treatments on the surface of the titanium alloy matrix of which the surface is pretreated, and spraying the mixed powder to the surface of the titanium alloy matrix by a cold spraying method; and finally performing laser cladding treatments on the coating obtained by the cold spraying method so as to obtain the required hydroxylapatite coating. The preparation method disclosed by the invention utilizes the cold spraying method and the laser cladding composite technology to prepare the hydroxylapatite coating on the surface of the titanium alloy matrix, the preparation technology is simple and stable, the bonding strength of the prepared hydroxylapatite coating and the surface of the matrix can reach 40-50MPa, the coating is good in performance, and the long-term stability of between an implant and a bone interface of a host can be effectively facilitated.

Description

technical field [0001] The invention relates to the field of biomedical materials, in particular to a method for preparing a hydroxyapatite coating on the surface of a titanium alloy substrate. Background technique [0002] The development of modern medicine has made the "seamless connection" between artificial joint prosthesis and bone tissue possible, and the permanent fixation of artificial joint prosthesis and surrounding bone tissue is a prerequisite for the success of total hip arthroplasty, which occurs at the bone-prosthesis interface The process between is called osseointegration. The process of osseointegration is jointly affected by biomechanics and biomaterial properties. The strength of the prosthesis and bone depends on the design and geometry of the prosthesis, material selection and the mechanical properties of the surrounding bone tissue. In view of the complex biomechanics of the bone and joint system It is required that, in addition to having the biologic...

AI Technical Summary

Problems solved by technology

The properties of HA coating have an important influence on the implant effect and life of titanium alloy, among which the bonding strength between the coating and the titanium alloy substrate is particularly important. If the coating and the substrate are not tightly combined, the implant will easily cause coating in the human body layer detached from the metal matrix resulting in implant failure

[0004] The methods currently used to prepare HA nano-biological ceramic coatings on peptide alloys mainly include dry methods and wet methods. These methods generally have poor process reproducibility, low bonding strength, poor biological activity, and degradation. However, the film layer contains micropores, cracks and other shortcomings, and it is difficult to meet the clinical application needs of its lifespan, safety and reliability.

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