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Preparation method for reticulate structural part provided with component and pore double gradient transition layers

A network structure, double gradient technology, applied in the field of additive manufacturing, can solve the problems of metal implant prosthesis mechanical mismatch, poor osseointegration ability, low interface bonding force, etc., to improve osseointegration ability, save cost, The effect of improving production efficiency

Active Publication Date: 2017-01-04
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of mechanical mismatch between metal implant prosthesis and human bone tissue, low interface bonding force and poor osseointegration ability faced in the clinical application of metal bone prostheses, the present invention provides a dual-gradient transition with controllable composition and pores. The preparation method of the network structure of the layer, the method achieves the elimination of the component mutation interface by adjusting the composition and pore characteristics, and at the same time ensures that the prepared network structure has the mechanical properties matching the human bone, and the internal pore size is suitable for cell migration, adhesion and growth

Method used

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  • Preparation method for reticulate structural part provided with component and pore double gradient transition layers
  • Preparation method for reticulate structural part provided with component and pore double gradient transition layers

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preparation example Construction

[0030] A method for preparing a network structure with a dual gradient transition layer of composition and pores of the present invention mainly includes the following steps:

[0031] (1) Use 3D modeling software to design a 3D CAD model with a network structure with gradient pore scales and bionic cell topology, such as figure 1 As shown, the three-dimensional CAD model is sliced ​​and converted into an STL file, the STL file is imported into the SLM forming equipment, the SLM forming equipment is evacuated and a protective atmosphere is introduced, and high-purity argon is preferably used as the protective atmosphere;

[0032] Specifically, the network structure model is one of Cell unit, Cage unit, Cubic unit, Octahedron unit, Diamond unit or Gyroid unit based on the bionic structure. In order to meet the bionic requirements and allow bone cells to have enough space for growth, differentiation and migration, the porosity of the unit gradually changes from 60% to 80% at a ce...

Embodiment 1

[0045] Using the method of the present invention to prepare the network structure of the pure titanium / hydroxyapatite composition and pore controllable double gradient transition layer, the specific steps are as follows:

[0046] 1) Use 3D modeling software to design a 3D CAD model of the Diamond network structure with a gradient change in the pore scale of the bionic unit topology. The porosity of the unit gradually changes from 60% to 80% at a unit interval of 5%, and the unit size is designed to be 2mm , the height of the network structure is set to 10mm; the 3D CAD model is sliced ​​and converted into an STL file, imported into the SLM forming equipment, vacuumed and injected with high-purity argon as a protective atmosphere;

[0047] 2) The multi-component online powder mixing mechanism is used to uniformly mix the pure titanium powder and the hydroxyapatite powder in real time, so that the mass percentage of the hydroxyapatite is 1%, and they are uniformly mixed by an agi...

Embodiment 2

[0052] Using the method of the present invention to prepare the network structure of stainless steel / tricalcium phosphate composition and pore controllable double gradient transition layer, the specific steps are as follows:

[0053] 1) Use 3D modeling software to design a 3D CAD model of the Cubic network structure with a gradient change in the pore scale of the bionic unit topology. The porosity of the unit gradually changes from 60% to 80% at a unit interval of 4%, and the unit size is designed to be 8mm , the height of the network structure is set to 48mm, the 3D CAD model is sliced ​​and converted into an STL file, imported into the SLM forming equipment, vacuumed and injected with high-purity argon as a protective atmosphere;

[0054] 2) The multi-component online powder mixing mechanism is used to uniformly mix the stainless steel powder and the tricalcium phosphate powder in real time, so that the volume percentage of the tricalcium phosphate is 5%, and they are uniform...

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Abstract

The invention discloses a preparation method for a reticulate structural part provided with component and pore double gradient transition layers. The method comprises the following steps that (1) a three-dimensional model of a reticulate structure with bionic unit topology and gap dimension gradient changes is design, the three-dimensional model is subjected to slicing treatment and then converted into an STL document, and the STL document is input into SLM forming equipment; (2) various powders are evenly mixed according to a preset ratio, and a mixed powder is fed and laid; (3) a current slice layer of the reticulate structural part is subjected to laser scanning forming and is descended by the thickness of a laid power layer after forming is finished, and then the mixed powder in the current ratio is adopted for forming the next slice layer; (4) the step (3) is repeated until forming of the layers with the set height is completed through the powder in the current ratio, mixing of powder in another ratio is completed, and powder feeding and laying are conducted; and (5) the step (3) and (4) are repeated until forming of the whole reticulate structure with various components being in gradient transition is completed. The preparation method has the advantages of being high in preparation efficiency, simple in preparation technological process, low in cost and the like.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and more specifically relates to a method for preparing a mesh structure with a double gradient transition layer of composition and pores and its product. Background technique [0002] Human bones play a role in supporting the body, protecting organs, exercising and metabolizing. Once damaged, it will have a fatal impact on human health. Macroscopically, the human skeleton is composed of two phases, the superficial hard bone and the inner cancellous bone. The hard bone provides mechanical strength under tensile, compressive and torsional loads, and the cancellous bone relieves shock and resists continuous compression. , the human skeleton presents a sandwich macroscopic layered structure to withstand complex loading conditions. Microscopically, hard bone is formed by the accumulation of hollow pillars one after another, while cancellous bone is formed by interweaving interconnected micropor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B33Y10/00
CPCB22F3/1109B33Y10/00
Inventor 魏青松韩昌骏王倩闫春泽刘洁史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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