Bio-medical porous titanium products and preparation method thereof

A biomedical, porous titanium technology, applied in medical science, prosthesis, surgery, etc., can solve the problems of reduced strength, pungent ammonia gas, and low strength of molded products, reduce stress concentration effects, meet mechanical performance requirements, Reduces the effect of stress shielding

Inactive Publication Date: 2009-04-29
DALIAN JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the elastic modulus of dense titanium is still higher than that of natural bone (the elastic modulus of dense titanium is 110GPa, and the elastic modulus of human bone is 1.5-30GPa), making dense titanium as a human implant material in the following three There are problems in: the stability of the contact interface with bone tissue, the matching of biomechanical properties (such as elastic modulus), and the maintenance of stable blood supply
[0012] CN1817511A discloses a gel injection molding method for porous titanium with complex shapes. The gel injection molding process is used to realize the production of large powder metallurgy porous titanium blanks with high porosity and uniform macroscopic distribution of pores. Porous titanium can be obtained after sintering, but the disadvantage is that the porosity of the product is only up to 55%, and the strength is low
[0013] CN1961972A discloses a powder co-injection molding method. The inner core feeding material and the outer layer feeding material are respectively injected and molded successively, and then sintered after degreasing and desalting to obtain a porous structure

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  • Bio-medical porous titanium products and preparation method thereof
  • Bio-medical porous titanium products and preparation method thereof
  • Bio-medical porous titanium products and preparation method thereof

Examples

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[0043] Example 1

[0044] Take titanium powder with particle size ≤45μm and purity >99.3% as the matrix material, and add spherical polymethyl methacrylate particles as the pore former. The particle sizes are 71-100μm, 100-154μm, 154-200μm, 200-315μm, respectively. 315~400μm, 400~630μm. The volume fraction of the pore former is set to 10vol.%, 25vol.%, 30vol.%, 40vol.%, 50vol.%, 55vol.%, 60vol.% and 65vol.%, respectively. Weigh the material in proportion, mix the weighed titanium powder and the pore-forming agent evenly, pour an appropriate amount into the mold, and press it unidirectionally with a pressure of 500 MPa on the hydraulic universal testing machine, and the holding time is 15 seconds. Place the compact in a vacuum sintering furnace, in the 5×10 -3 Under Pa vacuum, heat to 250°C at a rate of 10°C / min. After holding for 30 minutes, gradually heat to 300°C, 350°C, and 400°C at a rate of 3°C / min, hold each for 40 minutes, and then gradually heat After heating to 450°C and ...

Example Embodiment

[0047] Example 2

[0048] This embodiment aims to prepare a gradient biomedical porous titanium material, and the selection of the particle size, purity and volume fraction of the titanium powder as the base material and the spherical particles of polymethyl methacrylate added as a pore former is the same as that of Example 1.

[0049] Pour the titanium powder into the mold. After leveling, mix the weighed titanium powder and the pore-forming agent evenly, and pour an appropriate amount into the mold. After leveling, pour the appropriate amount of titanium powder into the mold, and then spread another Layer the mixed powder of titanium powder and pore-forming agent, increasing by this. The number of layers and the pore characteristics of each layer of porous titanium are set according to requirements. Then use 500MPa pressure unidirectional compression on the hydraulic universal testing machine with a holding time of 15 seconds. Take out the compact and place it in a vacuum sinter...

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Abstract

The invention relates to a biological medical porous titanium material and a preparation method thereof. The preparation method, namely a method adopting powder metallurgy, is to add spherical particles of novel polymethyl methacrylate pore-forming agent to prepare a structure provided with a rough surface and three-dimensionally communicated open pores, wherein the number, the shape and the size of the pores can be controlled, namely, the porosity degree is less than 70vol. percent, the open porosity factor is more than 60 percent, the average pore diameter is less than 500 mums, the Young's modulus in compression is more than 0.3 GPa, the compressive strength is more than 40MPa, and the bending strength is more than 50MPa. The biological medical porous titanium material can be widely applied in the field of biological medical implants such as dental implants, artificial joints, spinal orthopaedic internal fixed systems, medullary internal nails and orthopaedic armor plates.

Description

technical field [0001] The invention relates to a biomedical porous titanium material and a preparation method thereof. Background technique [0002] Due to its ideal biocompatibility, excellent corrosion resistance, high fatigue strength, and low elastic modulus, titanium has become the most ideal metal biomaterial for long-term or permanent implantation in the human body. However, the elastic modulus of dense titanium is still higher than that of natural bone (the elastic modulus of dense titanium is 110GPa, and the elastic modulus of human bone is 1.5-30GPa), making dense titanium as a human implant material in the following three There are problems in aspects: the stability of the contact interface with bone tissue, the matching of biomechanical properties (such as elastic modulus) and the maintenance of stable blood supply. The elastic modulus of porous titanium decreases with the increase of porosity. Therefore, the use of porous titanium instead of dense titanium as ...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C1/08B22F3/12A61L27/06A61L27/56A61L31/02A61L31/14
Inventor 陆兴李伯琼
Owner DALIAN JIAOTONG UNIVERSITY
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