A uniform deposition process of hydroxyapatite coating on medical porous titanium and titanium alloy

Abstract

The invention relates to the field of surface modification treatment of medical materials and particularly discloses a technology for uniform deposition of HA (hydroxyapatite) coatings on medical porous titanium and titanium alloy. The technology for deposition of the HA coatings on the porous titanium and titanium alloy comprises processes including pretreatment of a porous metal base material, preparation of an electroplating solution and electro-deposition. In the pretreatment process, effective mechanical grinding and cleaning treatment can be performed on inner and outer surfaces of porous metal; in the electro-deposition process, HA electro-deposition treatment can be performed on the porous metal by using a rotating electrode electrolysis device, the thickness of diffusion layers on the inner and outer surfaces of the porous metal can be effectively reduced, and the problem that electro-deposition technologies of inner and outer surfaces of a porous structure are not synchronous can be effectively solved under the diffusion mixing controlled condition; uniform HA electro-deposition layers on the inner and outer surfaces of the porous metal are obtained by adjusting the rotating speed.

Description

technical field [0001] The invention relates to the field of surface modification treatment of medical materials, in particular to a process for uniformly depositing hydroxyapatite coatings on medical porous titanium and titanium alloys. Background technique [0002] It is a current trend that porous metals are used in orthopedic clinics such as the treatment of osteonecrosis and bone defects. The results of clinical trials show that even implant materials with only porous surfaces can significantly improve the histocompatibility of materials, which is mainly manifested in the greatly improved bonding ability and bonding strength of porous materials with bone tissue and fibrous tissue . From the perspective of biomechanics, the advantages of porous titanium or titanium alloy bone implants are very obvious: by adjusting the thickness of the scaffold, porous titanium alloys with different porosity, pore diameter and distribution can be produced to meet the support requirement...

AI Technical Summary

Problems solved by technology

In the actual electrochemical deposition process, due to electrochemical polarization, concentration polarization, and ohmic polarization, the effective overpotential at different electrode thicknesses distributed inside the porous structure is significantly lower than that on the outermost surface, resulting in a gap in the porous structure. The growth process of the electrodeposited layer at different positions of the auxiliary electrode and the final surface quality are not uniform, which is unavoidable for any porous metal electrochemical reaction process. If this non-uniform chemical and electrochemical reaction mechanism is not intervened, it will have Surface modification of porous metals of a certain thickness will necessarily result in inhomogeneous

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