Method for preparing complexly shaped biomedical porous titanium molybdenum alloy implant body

Abstract

The invention provides a method for preparing a complexly shaped biomedical porous titanium molybdenum alloy implant body and belongs to the technical field of biomedical porous metallic material preparation. The method comprises the following steps of: taking a mixture of titanium and molybdenum metallic element powder and organic polymer powder as raw materials, and then preparing the biomedical porous titanium molybdenum alloy implant body by adopting the processes, such as three-dimensional modeling, selective laser-firing rapid forming, thermal de-greasing, vacuum sintering, and the like. The processing steps are simple, the period is short, the use ratio of materials is high, the cost is low, any complexly shaped porous titanium alloy implant body can be conveniently manufactured, and the method has efficiency and economic advantages in individual design and rapid manufacturing of the implant body. A titanium molybdenum alloy material prepared by using the method has the advantages that pore space is uniform, adjustment scopes of porosity, aperture ratio and aperture are wide, elasticity modulus and compression strength are in close proximity to natural bone, and the demand on biomechanical compatibility required by a biomedical material is met.

Description

technical field [0001] The invention belongs to the technical field of preparation of biomedical porous metal materials, and provides a method for rapidly preparing complex-shaped biomedical porous titanium-molybdenum alloy implants. Background technique Titanium and titanium alloys have high specific strength, excellent corrosion resistance, sufficient wear resistance and good biocompatibility, and are considered to be the most promising biometal materials at present. However, the elastic modulus (55-110GPa) of dense titanium and titanium alloys does not match that of natural bone (3.21-30GPa), so that the load cannot be well transmitted from the implant to the adjacent bone tissue, that is, "stress shielding" occurs. Phenomenon, causing bone stress absorption around the implant, leading to loosening or fracture of the implant, and failure of the implant operation. Due to the existence of pores, metal materials with a porous structure can not only effectively reduce the...

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Problems solved by technology

Most of the porous biomedical materials prepared by SLS technology are polymer materials or polymer / ceramic composite materials (Tan K H, Chua C K, Leong K F, et al. Selective laser sintering of biocompatible polymers for applications in tissue engineering[J]. Biomedical materials and engineering, 2005, 15 (1-2): 113-124; Zhang Y, Hao L, Savalani M M, et al.Characterization and dynamic mechanical analysis of selective laser sintered hydroxyapatite filled polymeric composites[J].Journal of Biomedical Materials Research Part A, 2008, 86 (3): 607-616; Eosoly S, Brabazon D, Lohfeld S, et al.Selective laser sintering of hydroxyapatite / poly-ε-caprolactone scaffolds[J].Acta Biomaterialia, 2010, 6 (7): 2511-2517), the mechanical properties of these materials are generally low, and cannot meet the mechanical compatibility requirements of biomedical materials, and titanium-molybdenum alloys have good biocompatibility and mechanical properties, and no related materials have been seen so far. A report on the application of SLS technology to the preparation of porous titanium-molybdenum alloy materials

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