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A water-bath thermal oxidation treatment method for the surface of medical titanium and titanium alloys

A treatment method, titanium alloy technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of low cost performance, uneven oxide film growth, large internal stress, etc., to improve surface hardness and Abrasion resistance, solution to uneven growth, and high film-base binding force

Inactive Publication Date: 2017-04-19
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The ion implantation method mainly uses high-energy ions to bombard the surface of the material to obtain a thin film, which has good adhesion and no peeling off, but the biggest disadvantage is that the implanted layer is very thin, usually no more than 1 μm, once the implanted layer is destroyed After that, the matrix will be directly exposed and participate in the friction
And the process costs a lot, and the cost performance is low
[0005] (2) Diamond-like film coating method, DLC has extremely high hardness and wear resistance, but DLC is a brittle material, which does not match the physical properties of the substrate material during the growth process, resulting in large internal stress, so that the film and the substrate The bonding strength is poor, which limits the connection between the film and the substrate and the thickness of the film
[0006] (3) Laser modification method, the metallurgical bond with high bonding strength between the coating and the substrate, the coating thickness is relatively large, and has excellent properties such as high hardness, small friction coefficient, wear resistance, corrosion resistance and high temperature resistance, but Due to the rapid cooling of the molten pool, brittle phases in the film will be generated and high residual stress will be generated on the surface, resulting in cracks
In addition, air bubbles may form in the molten pool in an overheated state, and micropores and pores sometimes appear in the cladding layer
[0007] (4) The oxidation treatment method has the advantages of simple process, high cost performance, in-situ growth, and large film thickness. Comprehensive performance
[0008] At present, in various medical titanium and titanium alloy surface wear-resistant treatment methods, the thin film prepared by ion implantation method is too thin and the cost performance is too low. , prone to uneven oxide film growth and excessive growth

Method used

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  • A water-bath thermal oxidation treatment method for the surface of medical titanium and titanium alloys
  • A water-bath thermal oxidation treatment method for the surface of medical titanium and titanium alloys
  • A water-bath thermal oxidation treatment method for the surface of medical titanium and titanium alloys

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Effect test

Embodiment 1

[0032] In this embodiment, a medical titanium disk is used as a sample, and the thickness of the prepared oxide film is about 5 μm, and the microhardness is about 600 HV. The specific steps are as follows: the sample is ground and polished to a surface roughness of 0.05-0.1μm, ultrasonically cleaned in absolute ethanol or acetone solution for 20 minutes, then ultrasonically cleaned in deionized water for 20 minutes, and finally placed in a vacuum drying oven Dry for 24 hours for later use. Put the processed sample into the thermal oxidation tube furnace, set the oxidation temperature to 600℃, the heating rate to 5℃ / min, and the oxidation holding time for 3 hours. After the temperature rises to 600℃, start to transfer to the tube furnace Into the boiling water vapor, the water vapor flows out from the other outlet of the tube furnace. After the holding time is up, the natural cooling method in the furnace is adopted, but the boiling water vapor is still introduced until the temp...

Embodiment 2

[0034] In this embodiment, a medical titanium disk is used as a sample, and the thickness of the prepared oxide film is about 8 μm, and the microhardness is about 700 HV. The specific steps are as follows: the sample is polished to a surface roughness of 0.02-0.2μm, ultrasonically cleaned in absolute ethanol or acetone solution for 30 minutes, then ultrasonically cleaned in deionized water for 30 minutes, and finally placed in a vacuum drying oven Dry for 24 hours for later use. Put the processed sample into the thermal oxidation tube furnace, set the oxidation temperature to 800℃, the heating rate to 5℃ / min, and the oxidation holding time for 8 hours. After the temperature rises to 800℃, start to transfer to the tube furnace Into the boiling water vapor, the water vapor flows from the other outlet of the tube furnace. After the holding time is up, the natural cooling method in the furnace is adopted, but the boiling water vapor is still introduced until the temperature in the ...

Embodiment 3

[0036] In this embodiment, a medical titanium alloy (Ti6Al4V) artificial cervical intervertebral disc upper endplate joint prosthesis is used as a sample, and the thickness of the prepared oxide film is about 10 μm, and the microhardness is about 800 HV. The specific steps are as follows: professionally polish the articular surface of the prosthesis sample to a surface roughness of 0.08~0.1μm, ultrasonically clean in absolute ethanol or acetone solution for 20 minutes, then ultrasonically clean in deionized water for 30 minutes, and finally place it Dry in a vacuum drying oven for 24 hours for later use. Put the processed prosthesis sample into a thermal oxidation tube furnace, set the oxidation temperature to 700°C, the heating rate to 5°C / min, and the oxidation holding time to 4 hours. After the temperature rises to 700°C, the tube will start to flow. Boiling water vapor is introduced into the furnace, and the water vapor flows out from the other outlet of the tube furnace. A...

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Abstract

The invention discloses a water-bath thermal-oxidation processing method for surfaces of medical titanium and titanium alloy. Through steps of pretreatment, thermal oxidation processing and cooling, a film with the thickness of 5-15 mu m can be obtained on the surfaces of titanium and titanium alloy. The method has the advantages of simple technology, high cost performance, wide application scope, capability of processing a complex structure, and the like. The prepared films on the surfaces of medical titanium and titanium alloy have relatively large film base bonding force and relatively large film thickness because of in-situ growth, and are excellent in comprehensive performances.

Description

Technical field [0001] The invention belongs to the field of surface treatment of medical metal materials, and in particular relates to a water bath thermal oxidation treatment method for medical titanium and titanium alloy surfaces. Background technique [0002] Titanium and titanium alloys are widely used in the field of biomedicine due to their excellent specific strength, elastic modulus, biocompatibility and other properties, especially as hard tissue replacement materials, such as artificial joints, artificial intervertebral discs and other prostheses Structural materials, etc. However, titanium and titanium alloys have extremely poor wear resistance. After titanium alloy prosthesis is implanted in the human body, under the complex physiological and mechanical environment of the human body, the wear resistance life is significantly insufficient, and even a large number of wear particles may be produced, which may lead to osteolysis. Cause implantation failure. Insufficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/16
CPCC23C8/16
Inventor 王松王庆良廖振华卢俊哲刘伟强
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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