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

A biomedical technology with complex shapes, applied in prosthesis, medical science, process efficiency improvement, etc., can solve the problems of low mechanical properties and failure to meet the mechanical compatibility requirements of biomedical materials, and achieve excellent mechanical properties and open The porosity and pore size can be adjusted in a wide range, and the effect of less additive content

Inactive Publication Date: 2012-02-01
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] 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, while titanium-molybdenum alloys have good biocompatibility and mechanical properties, there is no report on the application of SLS technology to the preparation of porous titanium molybdenum alloy materials

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] Preparation of raw material powder: First, weigh 340g of 300-mesh Ti powder, 60g of 200-mesh Mo powder, and 35g of 160-mesh high-density polyethylene (HDPE) powder with an electronic balance, and then put the above powders into a ball mill and mix them. The ball-to-material ratio is 3 : 1, the ball milling time is 10h, and the rotating speed is 55r / min;

[0026] Construction of 3D model: Use Pro E software to draw the 3D shape of the implant, and use layering software to slice the 3D model, and store the processed 2D sheet information in STL format to the forming machine for selective laser sintering ;

[0027] Selective laser sintering: With the forming accuracy and green body strength as the standard, the laser beam is controlled by the computer, and the selective laser sintering is carried out according to the two-dimensional sheet information, and all the sheets are connected layer by layer to obtain the implanted body. Select optimized SLS process parameters: las...

Embodiment approach 2

[0032] On the basis of Example 1, only change the mass ratio of Ti powder and Mo powder and the high-temperature sintering temperature, that is, Ti / Mo=9 / 1, heat from room temperature to 1500 °C at a heating rate of 3 °C / min, and keep it warm After 3 hours, it was cooled with the furnace to obtain a Ti-10Mo alloy with a porosity of 18%, an open porosity of 16.3%, an average pore size of 30 μm, an elastic modulus of 54.89 MPa, and a compressive yield strength of 486.38 MPa.

Embodiment approach 3

[0034] Preparation of raw material powder: First, use an electronic balance to weigh 460g of 100-mesh Ti powder, 40g of 325-mesh Mo powder, and 30g of 400-mesh polystyrene (PS) powder, and then put the above powders into a ball mill and mix them. The ball-to-material ratio is 2: 1. The ball milling time is 8 hours, and the speed is 70r / min;

[0035] Construction of three-dimensional model: use CAD to draw the three-dimensional shape of the implant, and use layered software to slice the three-dimensional model, and store the processed two-dimensional slice information in STL format to the forming machine for selective laser sintering;

[0036] Selective laser sintering: With the forming accuracy and green body strength as the standard, the laser beam is controlled by the computer, and the selective laser sintering is carried out according to the two-dimensional sheet information, and all the sheets are connected layer by layer to obtain the implanted body. Select optimized SLS...

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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 [0002] 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 re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/11C22C14/00A61L27/06A61L27/56
CPCY02P10/25
Inventor 颉芳霞路新何新波曲选辉
Owner UNIV OF SCI & TECH BEIJING
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