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Method for preparing medical porous tantalum parts based on selective laser melting technology

A technology of selective laser melting and porous tantalum, which is applied in the fields of additive manufacturing, medical science, and process efficiency improvement, and can solve the problems of small environmental pollution, cracks in parts, and limited application of parts

Inactive Publication Date: 2019-11-08
XIAN CONTINENTAL BIOMATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porous tantalum materials prepared by traditional mechanical processing methods have low porosity, uneven pore size and high closed porosity
[0003] Selective laser melting technology is an effective way to prepare porous tantalum metal due to its high material utilization rate, "personalized" customization, high forming efficiency, large process controllability, and low environmental pollution. High melting point, during the SLM forming process, the time for the laser to act on the metal powder is extremely short, and the metal powder has to go through a process of instant melting and solidification, which will inevitably cause the non-equilibrium solidification of the metal powder from solid to liquid, in the material forming area and Large thermal stress is caused between the formed areas. If the laser printing parameters of the part are not selected properly, it will cause problems such as cracks and warping of the part, which will greatly limit the application of the part

Method used

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  • Method for preparing medical porous tantalum parts based on selective laser melting technology

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Experimental program
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Embodiment 1

[0029] Embodiment 1: A method for preparing medical porous tantalum parts based on selective laser melting technology, comprising the following steps:

[0030] Step 1: Spherical pure Ta powder prepared by ultra-high-speed plasma rotating electrode method is selected as the raw material for selective laser melting and forming, and the particle size range is between 15 and 53 μm; fluidity ≤ 10s, tap density ≥ 10g / cm 3 ;The composition of pure Ta powder is: C: ≤0.08%, N: ≤0.05%, H: ≤0.012%, O: ≤0.08%, Ta: balance;

[0031] Step 2: Design the pore size to be 200 μm and the pore-strut size to be 200 μm, use 3D software to build a cubic porous structure model, add support, slice the model into 2D, and import the sliced ​​files into the selected area laser melting molding equipment;

[0032] Step 3: Preheat the substrate before printing, and set the substrate preheating temperature to 100°C. Then pass argon gas into the forming cavity as a protective gas to ensure that the oxygen co...

Embodiment 2

[0036] Embodiment 2: A method for preparing medical porous tantalum parts based on selective laser melting technology, comprising the following steps:

[0037] Step 1: Spherical pure Ta powder prepared by ultra-high-speed plasma rotating electrode method is selected as the raw material for selective laser melting and forming, and the particle size range is between 15 and 53 μm; fluidity ≤ 10s, tap density ≥ 10g / cm 3 ;The composition of pure Ta powder is: C: ≤0.08%, N: ≤0.05%, H: ≤0.012%, O: ≤0.08%, Ta: balance;

[0038] Step 2: Design the pore size to be 500 μm and the pore-strut size to be 200 μm, use 3D software to build a cubic porous structure model, add supports, slice the model into 2D slices, and import the sliced ​​files into the selected area laser melting molding equipment;

[0039] Step 3: Preheat the substrate before printing, and set the substrate preheating temperature to 90°C. Then pass argon gas into the forming cavity as a protective gas to ensure that the ox...

Embodiment 3

[0043] Embodiment 3: A method for preparing medical porous tantalum parts based on selective laser melting technology, comprising the following steps:

[0044] Step 1: Select the ultra-high-speed plasma rotating electrode method to prepare spherical Ta powder as the raw material for selective laser melting and forming, with a particle size range of 15-53 μm; fluidity ≤ 10s, tap density ≥ 10g / cm 3 ;Pure Ta powder composition: C: ≤0.08%, N: ≤0.05%, H: ≤0.012%, O: ≤0.08%, Ta: balance;

[0045] Step 2: Design the pore size to be 700 μm and the pore-strut size to be 200 μm, use 3D software to build a cubic porous structure model, add supports, slice the model into 2D, and import the sliced ​​files into the selected area laser melting molding equipment;

[0046] Step 3: Preheat the substrate before printing, and set the substrate preheating temperature to 80°C. Then pass argon gas into the forming cavity as a protective gas to ensure that the oxygen content in the forming cavity is n...

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Abstract

The invention belongs to the technical field of laser additive manufacturing, and relates to a method for preparing medical porous tantalum parts based on a selective laser melting technology. The preparation method comprises the following steps that spherical tantalum powder prepared through an ultra-high-speed plasma rotating electrode method is selected as a raw material; three-dimensional software is adopted for constructing a to-be-prepared cubic porous structure model, in order to reach the specific porosity, the proper pore size and pore edge size are designed, supports are added, and the model is subjected to two-dimensional slicing and then guided into laser melting molding equipment; and proper laser printing process parameters are selected, the molding process is carried out under an argon protection atmosphere, after the parts are printed, the parts are subjected to vacuum heat treatment together with a substrate, then cutting, cleaning and sand blasting are conducted, andfinally the porous tantalum parts are obtained. Compared with the prior art, according to the method for preparing the porous tantalum parts, by optimizing the porous structure model and the laser printing process parameters, the prepared porous tantalum has good mechanical properties and is better matched with human sclerotin.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and in particular relates to a method for preparing medical porous tantalum parts based on selective laser melting technology. Background technique [0002] Due to the unique porous structure, medical porous metal materials are not only conducive to the growth of new bone tissue, but also can play a role in fixation. By controlling the porosity and pore size of the porous metal material, its elastic modulus is close to that of human bone, thereby avoiding the harm of "stress shielding" to human bone. In addition, compared with other medical metal materials, porous tantalum does not chemically react with acid and alkali at room temperature, and has good corrosion resistance; at the same time, it has excellent biocompatibility, and is even called "biophilic metal". However, porous tantalum materials prepared by traditional mechanical processing methods have low porosity, uneve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F9/14B33Y10/00B33Y70/00A61L27/04A61L27/56
CPCB22F3/11B22F9/14B33Y10/00B33Y70/00A61L27/047A61L27/56B22F2999/00B22F2998/10A61L2430/02B22F10/28B22F10/64B22F10/66B22F10/68B22F10/32B22F10/36B22F10/366Y02P10/25
Inventor 石晓艳刘辉罗锦华韩建业皇甫强成芸
Owner XIAN CONTINENTAL BIOMATERIALS CO LTD
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