Method using laser quick forming producing HA/Ti gradient biological activity material

Abstract

The invention discloses a method for preparing a HA / Ti gradient biological activity material by adopting laser rapid forming. The method introduces the conception of gradient function material, changes the mixture ratio of CaHPO4*2H2O+CaCO3 and titanium powder in a gradient way, and adopts the laser rapid forming technology to melt and cover the mixing material into the surface of titanium metal directly in hope of obtaining the medical gradient biological activity material with good bonding strength, thereby improving the proliferation and differentiation of the osteocyle on the metal surface, solving the difficulty of the early bonding between the metal implantation material and the bone, and providing a theoretical and experimental basis for better clinic application of titanium.

Description

technical field [0001] The invention belongs to the field of medicine, and relates to a method for preparing metal functional materials or a surface modification treatment method for metal implants, in particular to a method for preparing HA / Ti gradient bioactive materials by laser rapid prototyping, which is used to prepare bone tissue metal implant. Background technique [0002] As biologically inert materials, titanium and titanium alloys are widely used in stomatology, orthopedics and adjacent disciplines due to their good mechanical properties and biocompatibility, and can be processed into dental implants, artificial joints, bone plates, intramedullary nails, etc. . With the trend of population aging, the number of implants such as dental implants and artificial joints is increasing year by year. In terms of dental implants, the total domestic demand exceeds 4 million pieces. At present, about 1.5 million people around the world receive artificial joint replacement e...

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Problems solved by technology

[0009] (1) The mixed powder for cladding adopts the method of manually presetting the powder, cladding one layer and then presetting another layer, which causes continuous interruption of the process and is relatively complicated; in addition, the surface of medical implants is mostly free with complex geometric shapes. For curved surfaces, the method of manually prepowdering powder can only prepare coatings on flat base materials, and does not have the potential to prepare coatings on the surface of materials with complex shapes;

[0010] (2) The temperature is not easy to accurately control, resulting in difficult control of the phase composition of the product;

[0011] (3) The temperature change of sudden cooling and sudden heating can easily cause a large amount of residual thermal stress, resulting in cracks in the formed material;

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