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Surface treatment for improving bioactivity and wear-resistant ability of titanium alloy surfaces

A bioactive, wear-resistant technology, applied in the coating and other directions, to achieve the effect of enhancing the bonding force, avoiding phase transition and embrittlement, and being easy to operate

Inactive Publication Date: 2005-12-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these alloys are still biologically inert and cannot form strong chemical bonds with human tissue

Method used

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  • Surface treatment for improving bioactivity and wear-resistant ability of titanium alloy surfaces
  • Surface treatment for improving bioactivity and wear-resistant ability of titanium alloy surfaces
  • Surface treatment for improving bioactivity and wear-resistant ability of titanium alloy surfaces

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The Ti-29Nb-13Ta-4.6Zr sample was oxidized in air at 400°C for 24 hours, and then furnace cooled to room temperature. After this treatment, the surface hardness of the Ti-29Nb-13Ta-4.6Zr sample increased by about 300MPa (see Table 1), which is beneficial to the improvement of the alloy's wear resistance.

[0030] Soak the oxidized alloy in 10M NaOH solution at 60°C for 24 hours, and then dry it in air at 40°C for 24 hours.

[0031] The oxidized and alkali-treated Ti-29Nb-13Ta-4.6Zr samples were immersed in SBF and FCS solutions for 4 weeks to obtain spherical hydroxyapatite coatings (see figure 1 ), the X-ray diffraction pattern of the spherical hydroxyapatite coating is shown in image 3 .

Embodiment 2

[0033] The Ti-29Nb-13Ta-4.6Zr sample was oxidized in air at 400°C for 24 hours, and then furnace cooled to room temperature. After this treatment, the surface hardness of the Ti-29Nb-13Ta-4.6Zr sample increased by about 300MPa (see Table 1), which is beneficial to the improvement of the alloy's wear resistance.

[0034] Soak the oxidized alloy in 10M NaOH solution at 60°C for 24 hours, and then dry it in air at 40°C for 24 hours.

[0035] The oxidized and alkali-treated Ti-29Nb-13Ta-4.6Zr samples were immersed in SBF and FCS solutions for 4 weeks and 2 weeks, respectively, to obtain needle-shaped hydroxyapatite coatings (see figure 2), the X-ray diffraction pattern of needle-like hydroxyapatite coating is shown in Figure 4 .

[0036] Vickers Hardness (MPa)

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Abstract

A surface treating method for increasing the surficial bioactivity and antiwear power of Ti alloy features that a gradient coated layer composed of internal oxidized layer (0.5-5 microns in thickness) and external hydroxyapatite layer (0.1-10 microns in thickness) is prepared on the surface of Ti alloy.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface treatment method for improving the biological activity and wear resistance of the titanium alloy surface. Background technique [0002] Titanium and its alloys have good biocompatibility and corrosion resistance, and are widely used in medical implant materials. At present, the medical titanium alloys widely used in clinical medicine are mainly α+β type Ti-6A1-4V and Ti- The elastic modulus of 6Al-7Nb is only half of that of stainless steel and cobalt-based alloys, thus reducing the shielding effect caused by the large difference between the modulus of the implant and the bone, reducing the risk of bone tissue resorption and implant fracture. Because titanium alloys containing Al and V release Al and V ions with cytotoxicity and neurotoxicity after long-term implantation in the human body due to wear and corrosion, developed countries such as the United States...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/32
Inventor 李述军邹玉琳杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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