Preparation method of graded porous nickel-titanium alloy

Abstract

The invention discloses a preparation method of a graded porous nickel-titanium alloy, and belongs to the technical field of preparation of biomedical materials. The preparation method comprises the steps that Ni metal powder and Ti metal powder are weighed according to the composition proportion and then subjected to ball milling mechanical mixing; the mixed metal powder is divided into a plurality of parts, and the parts and an ammonium bicarbonate pore forming agent are weighed according to different porosity ratios and mixed; and after mixing, powder of different compositions is mechanically pressed into a graded block compact, the graded block compact is placed in a discharge plasma sintering furnace, after a system is vacuumized to 2 Pa to 6 Pa, sintering is carried out, the temperature rising rate ranges from 50 min / DEG C to 100 min / DEG C, heat preservation is carried out for 5 min to 10 min under the temperature ranging from 600 DEG C to 1000 DEG C, furnace cooling is carried out to achieve room temperature, and a graded porous nickel-titanium alloy medical material can be obtained. The part, in contact with the bone tissue, of the implanted material has high porosity and the large aperture, bone cells can be bonded to the surface of the material to grow, and biological locking is formed; and the inner structure is provided with a dense body high in strength and superelasticity, the material can be matched with the bone tissue, cooperative deformation is generated, the stress shielding effect is weakened, and the material can adapt to stress bearing conditions of bones on different portions. Thus, the biomedical graded porous nickel-titanium alloy material prepared through the method can be used as a good bone bearing orthopedic implant material.

Description

technical field [0001] The invention relates to a method for preparing a hierarchical porous nickel-titanium alloy, which belongs to the technical field of preparation of biomedical materials. Background technique [0002] In recent years, in artificial implant biomedical metal materials, porous nickel-titanium alloy has been widely used in interventional therapy, cardiology and other medical fields due to its shape memory effect, unique superelasticity and pore structure that can make cells adhere and grow on its surface. received widespread attention. (See literature: Rhalmi S, Odin M, Assad M, et al. Hard, soft tissue and in vitro cell response to porous nickel-titanium: a biocompatibility evaluation[J]. Bio-medical materials and engineering, 1999, 9(3): 151-162. Greiner C, Oppenheimer S M, Dunand D C. High strength, low stiffness, porous NiTi with superelastic properties[J]. Acta Biomaterialia, 2005, 1(6): 705-716) [0003] However, in clinical practice, if you want to...

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Problems solved by technology

[0006] Aiming at the problems existing in the current porous biological nickel-titanium materials, the present invention provides a method for preparing a hierarchical porous nickel-titanium alloy with high porosity, large pore diameter, high strength and excellent superelasticity; the purpose is to simultaneously solve the problem of increasing implantation The pore parameters of the implant can make bone cells better adhere and grow on its surface, form long-term stable biological fixation and increase the strength and superelasticity of the implant so that the implant can meet the mechanical bearing requirements of different parts of the bone. At the same time, It also provides a research basis for the preparation of a graded implant with different functions

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