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Method for plasma spraying of Ca-P bioactive coating on surface of magnesium alloy

A surface plasma and bioactive technology, applied in the preparation process of ion-sprayed calcium-phosphorus bioactive coatings, can solve the problems of low bioactivity of biomaterials, and achieve the effect of being suitable for automatic production, simple operation, and easy process control

Inactive Publication Date: 2011-10-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of too fast degradation rate and low biological activity of magnesium alloy biological materials, the present invention provides a process for preparing Ca-P bioactive coating on the surface of magnesium alloy by plasma spraying, which not only controls the rapid degradation of magnesium alloy, but also improves its biological activity. active

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  • Method for plasma spraying of Ca-P bioactive coating on surface of magnesium alloy
  • Method for plasma spraying of Ca-P bioactive coating on surface of magnesium alloy
  • Method for plasma spraying of Ca-P bioactive coating on surface of magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Step 1: Material preparation and cleaning. The square flake magnesium alloy AZ31B was used as the substrate, and the substrate was ultrasonically cleaned with acetone and deionized water for 10 min, wiped with filter paper, and air-dried for later use. In ultrasonic cleaning, the ultrasonic power is 40KW and the frequency is 150khz.

[0022] Step 2: Surface sandblasting. The surface of the magnesium alloy was roughened by sandblasting with 24 mesh corundum sand, the sandblasting time was 10s, the sandblasting pressure was 0.25MPa, and the roughness Ra was maintained at 8-15μm.

[0023] Step three: plasma spraying. The Ca-P bioactive coating was prepared on the surface of the magnesium alloy substrate after sandblasting by using Praxair 7700 atmospheric plasma spraying equipment. Before spraying, the substrate was preheated at 150°C with a plasma jet flame. The spraying process is realized by controlling the following parameters: main gas (Ar) 45L / min, auxiliary gas ...

Embodiment 2

[0027] Step 1: Material preparation and cleaning. The square flake magnesium alloy AZ31B was used as the substrate, and the substrate was ultrasonically cleaned with acetone and deionized water for 10 min, wiped with filter paper, and air-dried for later use. In ultrasonic cleaning, the ultrasonic power is 40KW and the frequency is 150khz.

[0028] Step 2: Surface blasting treatment: use 24-mesh corundum sand to roughen the surface of the magnesium alloy. The blasting time is 8s, the blasting pressure is 0.20MPa, and the roughness Ra is maintained at 8-12μm.

[0029] Step 3: Plasma spraying: A Ca-P bioactive coating was prepared on the surface of the sandblasted magnesium alloy substrate using Praxair 7700 atmospheric plasma spraying equipment, and the substrate was preheated at 170°C with a plasma jet flame before spraying. The spraying process is realized by controlling the following parameters: main gas (Ar) 47L / min, auxiliary gas (He) 13L / min, spraying power 24.5kw, spray...

Embodiment 3

[0032] Step 1: Material preparation and cleaning. The square flake magnesium alloy AZ31B was used as the substrate, and the substrate was ultrasonically cleaned with acetone and deionized water for 10 min, wiped with filter paper, and air-dried for later use. In ultrasonic cleaning, the ultrasonic power is 40KW and the frequency is 150khz.

[0033] Step 2: Surface blasting treatment: use 24-mesh corundum sand to roughen the surface of the magnesium alloy by blasting for 10s, blasting pressure at 0.25MPa, and keep the roughness Ra at 8-15 μm.

[0034]Step 3: Plasma spraying: The Ca-P bioactive coating was prepared on the surface of the magnesium alloy substrate after sandblasting using Praxair 7700 atmospheric plasma spraying equipment, and the substrate was preheated at 180°C with a plasma jet flame before spraying. The spraying process is realized by controlling the following parameters: main gas (Ar) 48L / min, auxiliary gas (He) 15L / min, spraying power 25kw, spray gun moving...

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Abstract

The invention discloses a method for plasma spraying of a Ca-P bioactive coating on the surface of a magnesium alloy. The method comprises the following steps of: preheating the magnesium alloy to 130-250 DEG C by using a plasma torch before spraying, wherein the spraying parameters are that: the main gas Ar is 40-50 L / min, the auxiliary gas He is 10-20L / min, the spraying power is 15-35kW, the moving speed of a spray gun is 300-500mm / s, the spraying distance is 80-150mm, the powder feed rate is 5-12g / min and cooling air is not used in the spraying process; and heating to about 100-120 DEG C for 2-4 hours by using steam after spraying. By adopting the process disclosed by the invention, the Ca-P coating can be prepared on the surface of the magnesium alloy through spraying, so that the degradation rate of the magnesium alloy is reduced and the bioactivity of a magnesium alloy material is improved; the process is easy to control; and the method is easy and convenient to operate and easy to popularize.

Description

technical field [0001] The invention relates to surface modification of magnesium alloy biomaterials, in particular to a preparation process for plasma spraying calcium-phosphorus (Ca-P) bioactive coatings on the surface of magnesium alloys. Background technique [0002] Magnesium and magnesium alloys have the characteristics of good metal processing, strength, toughness, density and elastic modulus very similar to human bone, and show good biocompatibility in clinical practice. As a new type of biomedical material, it is becoming Research hotspots in related fields at home and abroad. However, the rapid corrosion degradation rate of magnesium and magnesium alloys and the generation of alkaline corrosion products limit their clinical application. Therefore, controlling the corrosion rate of magnesium and magnesium alloys and reducing the impact of corrosion products on body tissues have become the key to research. At present, there are mainly two types of measures to reduce...

Claims

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Application Information

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IPC IPC(8): C23C4/04A61L27/32A61L27/54A61L27/04
Inventor 宁成云郭远军
Owner SOUTH CHINA UNIV OF TECH
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