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

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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

CN101418392AInactive Publication Date: 2009-04-29DALIAN JIAOTONG UNIVERSITY

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Embodiment 1

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

Embodiment 2

[0048] This example aims at preparing a gradient biomedical porous titanium material. The particle size, purity and volume fraction of the base material titanium powder and the added pore-forming agent polymethyl methacrylate spherical particles are the same as those in Example 1.

[0049] Pour the titanium powder into the mold, after paving, mix the weighed titanium powder and pore-forming agent evenly, take an appropriate amount and pour it into the mold, after paving, then pour an appropriate amount of titanium powder into the mold, and then spread another The mixed powder of titanium powder and pore forming agent is added in increments. The number of layers and the pore characteristics of each layer of porous titanium are set according to requirements. Then use 500MPa pressure unidirectional pressing on the hydraulic universal testing machine, the dwell time is 15 seconds, take out the green compact, place it in the vacuum sintering furnace, in 2×10 -3 Under the vacuum de...

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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

Patent Timeline

29 Apr 2009

Publication

CN101418392A

IPC: C22C1/04; C22C1/08; B22F3/12; A61L27/06; A61L27/56; A61L31/02; A61L31/14

Inventors: 陆兴; 李伯琼