Method for manufacturing high-performance medical metal by mixing selective laser melting and laser surface texture

A technology of laser selective melting and surface texture, which is applied in the direction of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., to achieve excellent antibacterial performance, corrosion performance, and excellent osseointegration performance

Active Publication Date: 2021-12-03
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the combination of "laser selective melting and laser surface texturing" to prepare medical metals with two excellent properties of antibacterial and osseointegration has not been reported in the literature.

Method used

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  • Method for manufacturing high-performance medical metal by mixing selective laser melting and laser surface texture
  • Method for manufacturing high-performance medical metal by mixing selective laser melting and laser surface texture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The rust-removed and sand-blasted stainless steel is used as the base material, and the copper-containing antibacterial stainless steel is prepared by laser selective melting forming combined with laser surface texture. The microstructural characteristics of the obtained copper-containing antibacterial stainless steel are: And cylindrical face-centered cubic austenite grain size is between 500 and 800nm, and the edge of the molten pool is composed of well-oriented and interconnected cellular and columnar subgrains; The nanometer ε-Cu particles with cubic structure are uniformly distributed in γ-Fe; after femtosecond laser treatment, the surface wettability behavior of copper-containing antibacterial stainless steel is hydrophilic, and the contact angle increases to 90-100°, which is beneficial to Bacterial cells dissociate and desorb on the surface of copper-containing antibacterial stainless steel; when tested in human serum bioelectrolyte, the charge transfer resistanc...

Embodiment 2

[0048] The rust-removed and sand-blasted stainless steel is used as the base material, and the copper-containing antibacterial stainless steel is prepared by laser selective melting forming combined with femtosecond laser treatment. The microstructural characteristics of the obtained copper-containing antibacterial stainless steel are: And cylindrical face-centered cubic austenite grain size is between 500 and 800nm, and the edge of the molten pool is composed of well-oriented and interconnected cellular and columnar subgrains; The nanometer ε-Cu particles with cubic structure are evenly distributed inside the γ-Fe lattice; after femtosecond laser treatment, the surface wettability behavior of copper-containing antibacterial stainless steel is hydrophilic, and the contact angle increases to 90-100°, It is conducive to the dissociation and desorption of bacterial cells on the surface of copper-containing antibacterial stainless steel; when tested in the biological electrolyte of...

Embodiment 3

[0057] The titanium alloy that has been derusted and sandblasted is used as the substrate, and the copper-containing antibacterial titanium alloy is prepared by laser selective melting forming combined with femtosecond laser treatment. The microstructural characteristics of the obtained copper-containing antibacterial titanium alloy are as follows: as a matrix, small The grain size of acicular martensite can reach hundreds of nanometers to several micrometers in width and tens of micrometers in length, and the edge of the molten pool is composed of well-oriented and interconnected subgrain structures; it is formed by self-assembly due to liquid phase separation Nano-sized ε-Cu particles with a face-centered cubic structure are uniformly distributed inside the martensitic lattice; after femtosecond laser treatment, the surface wettability behavior of the copper-containing antibacterial titanium alloy is hydrophilic, and the contact angle increases to 90 ~100°, which is conducive...

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Abstract

The invention discloses a method for manufacturing high-performance medical metal by mixing selective laser melting and laser surface texture. The method comprises the following steps of layering and slicing a CAD model of a medical metal part to generate a series of two-dimensional scanning tracks; according to the scanning track, medical metal powder is stacked point by point, line by line and layer by layer through a selective laser melting method to form a three-dimensional porous structure, and the hole pattern is designed in a topological optimization mode; performing femtosecond laser micromachining on the surface of the porous structure to generate a hydrophilic structure; and enabling the medical metal powder to be composed of pure copper powder and 316L stainless steel powder or titanium alloy powder. The medical metal prepared through the method has a fine microstructure, the corrosion resistance, biocompatibility and antibacterial performance of the medical metal can be improved, the osseointegration performance of the medical metal is greatly improved, as a bone implant, the medical metal greatly improves the stress shielding effect caused by mismatching with the elastic modulus of bones, easily infects in the operation and overcomes the contradiction between the antibacterial property and the osseointegration property.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing (3D printing), in particular to a method for manufacturing high-performance medical metals by laser selective melting and laser surface texture. Background technique [0002] Copper-containing stainless steel and copper-containing titanium alloy have broad-spectrum antibacterial properties and good biocompatibility, and have been widely used as implants in the field of medical and health care. However, the precipitation of copper ions on the metal surface will destroy the integrity of the passivation film, greatly reducing its corrosion resistance, thus greatly limiting its application in medical implants. At present, surface treatment technologies are usually used to improve the corrosion resistance of copper-containing stainless steel and copper-containing titanium alloys, including ion implantation, electroplating coating, and vapor deposition. However, high-energy bombard...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F10/366B22F10/64B22F10/66B33Y10/00B33Y30/00B33Y70/00C22C38/02C22C38/44C22C38/54C22C14/00
CPCB22F10/28B22F10/366B22F10/64B22F10/66B33Y10/00B33Y30/00B33Y70/00C22C38/44C22C38/54C22C38/02C22C14/00Y02P10/25
Inventor 周圣丰张文财刘莹杨俊杰李卫
Owner JINAN UNIVERSITY
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