Method for preparing nano-hydroxyapatite gradient coating on titanium alloy matrix

A nano-hydroxyapatite, gradient coating technology, applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problem of unfavorable long-term implantation, low bonding strength, HA coating decomposition, etc. problems, to achieve the effect of retaining biological activity and stability, the process is simple and easy, and the production cycle is short

Inactive Publication Date: 2017-02-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various methods have their own defects such as low binding strength and HA decomposition.
The HA coating obtained by the plasma spraying preparation process that has been put into commercial application at present will decompose due to high temperature, causing the coating to decompose too quickly after implantation, which is not conducive to long-term implantation

Method used

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  • Method for preparing nano-hydroxyapatite gradient coating on titanium alloy matrix
  • Method for preparing nano-hydroxyapatite gradient coating on titanium alloy matrix

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1: Ti 13 Nb 13 After the inert ceramic transition layer was sintered on the Zr titanium alloy substrate at 810°C for 30 minutes, the HA coating was sintered on the transition layer at 810°C for 30 minutes, and the combined cross section of the coating was obtained as follows: figure 2 As shown in (a), it can be found that the coating bonding interface gap obtained under this process parameter is relatively large, and the coating bonding performance is not good. The measured coating adhesion is between 7MPa and 10MPa.

example 2

[0026] Example 2: Ti 13 Nb 13 After the inert porcelain transition layer was sintered on the Zr titanium alloy substrate at 830°C for 30 minutes, the HA coating was sintered on the transition layer at 830°C for 30 minutes, and the combined cross section of the coating was obtained as follows: figure 2 As shown in c and d, it can be found that the coating bonding interface gap obtained under this process parameter is smaller than the coating gap obtained in Example 1, and the coating bonding performance is also better. The measured coating adhesion is between 12MPa and 17MPa.

[0027] Example 3: Ti 13 Nb 13 After the inert ceramic transition layer was sintered on the Zr titanium alloy substrate at 850 °C for 30 minutes, the HA coating was sintered on the transition layer at 850 °C for 30 minutes, and the combined cross section of the coating was obtained as follows: figure 2 As shown in c and d, it can be found that the coating bonding interface gap obtained under this pr...

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Abstract

The invention provides a method for preparing a nano-hydroxyapatite gradient coating on a titanium alloy matrix, and relates to a nano HA/ insert ceramic gradient coating using biologic inert ceramic as a transition layer on the titanium alloy matrix. A dip-coating-sintering method is provided. The method is characterized in that the titanium alloy matrix is pre-treated; inert ceramic suspension liquid and nano HA/ inert ceramic suspension liquid are prepared; an inert ceramic transition layer is prepared by dip-coating and sintering, and a nano HA/ inert ceramic composite layer is prepared by dip-coating and sintering, wherein argon is treated as the sintering atmosphere. According to the method, a low-melting-point biologic inert ceramic is introduced to be used as a transition layer during the preparation of the gradient coating, so that the problem of poor combination strength caused by mismatching of expansion coefficient and elasticity modulus of titanium alloy and HA can be solved; in addition, HA cannot be decomposed in low-temperature sintering, and the low temperature is 800 to 850 DEG C, so that the biological activity and the stability of hydroxyapatite remain; moreover, the method is simple, easy to carry out, short in production cycle, low in cost, and capable of preparing the coating on an implant with a complex shape.

Description

technical field [0001] The invention relates to a method for preparing a gradient coating of nano-hydroxyapatite, especially a method for preparing a gradient coating by low-melting bioinert porcelain as a transition layer by low-temperature sintering. The obtained gradient coating maintains the biological activity and Stability, good bonding force with the matrix. Can be used as biological implant medical material. Background technique [0002] Titanium alloy has good biocompatibility and excellent mechanical properties, but its hardness is low and its wear resistance is poor. Its corrosion resistance depends on an oxide film on the surface. Once the oxide film is destroyed, a new oxide film cannot be formed immediately. Therefore, Severe corrosion occurs, and titanium alloys are biologically inert and cannot effectively promote bone adhesion and growth. In order to prevent wear of titanium alloys and improve the biocompatibility of titanium alloy materials, biological co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C20/02A61L27/06A61L27/32A61L27/30A61L27/50
CPCC23C20/02A61L27/06A61L27/306A61L27/32A61L27/50A61L2420/02A61L2420/06A61L2420/08A61L2430/02C23C28/04
Inventor 尹海清邱俊杰曲选辉何剑桥张桐
Owner UNIV OF SCI & TECH BEIJING
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