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Method for surface modification of medical beta titanium alloy by laser remelting technology

A β-titanium alloy, laser remelting technology, applied in the coating process and coating of metal materials, can solve the problems of poor conductivity and weldability, unsatisfactory effect, poor wear resistance, etc., to achieve enhanced Fine-grain strengthening effect, increased hardness, and easy-to-thickness effect

Active Publication Date: 2015-11-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Biomedical titanium and titanium alloys currently prepared still have defects such as low hardness, poor high temperature resistance, poor electrical conductivity and weldability, and poor wear resistance. Higher performance requirements
Usually we need to use surface treatment or surface modification to improve and enhance the use characteristics of titanium and titanium alloys. In the prior art, we mainly use micro-arc oxidation, carburizing, sol-gel, vapor deposition, plasma spraying, and ion implantation. , friction stir welding and other technologies to treat or modify the surface of titanium and titanium alloys, but the effect is not very satisfactory

Method used

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  • Method for surface modification of medical beta titanium alloy by laser remelting technology
  • Method for surface modification of medical beta titanium alloy by laser remelting technology
  • Method for surface modification of medical beta titanium alloy by laser remelting technology

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Embodiment 1

[0040] This embodiment relates to a method of modifying the surface of medical β-titanium alloy using laser remelting technology. The specific steps are as follows:

[0041] (a), material surface treatment: after rolling and annealing, the surface of β titanium alloy with a thickness of 0.8mm is polished to remove scale, straightened, and the surface is smooth and flat, and then cleaned with acetone to keep the surface of the sample clean; The annealing time of the rolling annealing is 5min.

[0042](b), install and process the sample: the laser is a 3.5 kilowatt ROFIN DL 035Q semiconductor laser, and the wavelength of the output laser is 808nm-940nm. When performing laser remelting, the spot at the laser focus is rectangular, and its size is 2.0mm×3.3mm. Fix the β-titanium alloy on the workbench of the semiconductor laser equipment with a fixture, and set the processing parameters: the laser remelting power is 450W, the scanning speed is 2mm / s, the distance between the laser...

Embodiment 2

[0047] Using laser remelting treatment to modify the surface of medical β titanium alloy, the specific steps refer to Example 1, the differences are as follows:

[0048] The processing parameters of laser remelting of medical β-titanium alloy with a thickness of 1.0mm after rolling and annealing: the laser remelting power is 500W, the scanning speed is 5mm / s, and the gas flow rate of argon protection is 30L / min.

[0049] After the remelting surface modification treatment, the hardness of the remelting area is about 150HV higher than that of the base metal.

Embodiment 3

[0051] Using laser remelting treatment to modify the surface of medical β titanium alloy, the specific steps refer to Example 1, the differences are as follows:

[0052] The process parameters of laser remelting modification of medical β-titanium alloy with a thickness of 0.6mm after rolling and annealing were designed: the laser remelting power was 350W, the scanning speed was 1mm / s, and the gas flow rate of argon protection was 20L / min.

[0053] After the remelting surface modification treatment, the hardness of the remelting area is about 100HV higher than that of the base metal.

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Abstract

The invention provides a method for surface modification of a medical beta titanium alloy by a laser remelting technology; the surface remelting treatment is performed for the medical beta titanium alloy through a semiconductor laser; and the laser remelting comprises process parameters of 350-500 W of laser power, 1-5 mm / s of scanning speed and 1 machining pass. The method prominently improves the surface hardness of the medical beta titanium alloy material; and the medical beta titanium alloy after the surface modification is smooth in surface, and can be applied to subsequent process flows without needing surface finishing.

Description

technical field [0001] The invention relates to a method for surface modification of a medical β titanium alloy used in the field of surgical implantation, specifically adopting laser remelting surface treatment technology to treat a biomedical β titanium alloy Ti-35Nb-2Ta-3Zr (wt.% ) for surface modification and laser remelting to improve the mechanical properties of medical β-titanium alloys. Background technique [0002] In the early 1950s, in the United Kingdom and the United States, pure titanium was first used to manufacture biomedical materials such as bone plates, hip joints, intramedullary nails and screws. However, it has been found clinically that the strength and stiffness of hip joints and intramedullary nails made of pure titanium are obviously insufficient. Since the 1990s, the research and development of new titanium alloys has become the focus of the development of medical materials. However, the application of titanium alloys in biomedicine not only has r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 马晓丽王立强姚成武吕维洁
Owner SHANGHAI JIAO TONG UNIV
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