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Surface ion nitriding method for medical CoCrMo alloy

A technology of ion nitriding and alloying, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of inability to wear and prevent harmful ion release, limited thickness of nitrogen ion implantation, and poor penetration Difficult to meet the requirements and other problems, to achieve the effects of reducing the release of toxic ions, low cost, and simple preparation process

Inactive Publication Date: 2011-04-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of nitrogen ion implantation is limited, and the depth of the implanted layer at 50-100keV is only 0.1-0.2μm. For hip and knee prostheses with load-bearing and frequent movements, it is difficult to meet the requirements of this thickness of the implanted layer.
Because the prosthesis is under the action of load-bearing load and friction, the thinner nitrogen ion implantation layer is easily worn away, and eventually the CoCrMo (cobalt chromium molybdenum) alloy is exposed, which cannot effectively wear and prevent the release of harmful ions. effect

Method used

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  • Surface ion nitriding method for medical CoCrMo alloy
  • Surface ion nitriding method for medical CoCrMo alloy
  • Surface ion nitriding method for medical CoCrMo alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment one, with 180 # , 400 # , 800 # , 1200 # The surface of the medical CoCrMo (cobalt chromium molybdenum) alloy is polished in turn with water sandpaper, and then the surface roughness of the CoCrMo (cobalt chromium molybdenum) alloy is reduced to below 15nm by mechanical polishing. After polishing, the CoCrMo (cobalt chromium molybdenum) alloy is ultrasonically cleaned with alcohol solvent Alloy, cleaning time is 15 minutes to remove the dirt on the surface of the alloy, and then dry it in a drying furnace at 60°C for 10 hours, and set aside; the reaction of putting the dried medical CoCrMo (cobalt chromium molybdenum) alloy into the ion nitriding furnace In the chamber, vacuumize the reaction chamber (the air pressure of the reaction chamber is lower than 0.1Pa), and then pass argon gas into the reaction chamber to sputter and clean the alloy. When cleaning, the air pressure of the reaction chamber is 120Pa, and the discharge voltage is 500V. , Cleaning is...

Embodiment 2

[0024] Embodiment two, the medical CoCrMo (cobalt chromium molybdenum) alloy surface is coated with 180 # , 400 # , 800 # , 1200 # The water sandpaper is polished in sequence, and then the surface roughness of the CoCrMo (cobalt chromium molybdenum) alloy is reduced to below 15nm by mechanical polishing. After polishing, the CoCrMo (cobalt chromium molybdenum) alloy is immersed in an alcohol solvent and ultrasonically cleaned for 10 minutes to remove the surface roughness of the alloy surface. The dirt was dried in a drying oven at 60°C for 10 hours, and then set aside. Put the dried medical CoCrMo (cobalt chromium molybdenum) alloy into the reaction chamber of the ion nitriding furnace, and vacuumize the reaction chamber. When the pressure in the reaction chamber is lower than 0.1Pa, argon gas is introduced into the reaction chamber The alloy is sputtered and cleaned, and the cleaning is carried out simultaneously during the heating process of the reaction chamber. During ...

Embodiment 3

[0026] Embodiment three, the surface of the medical CoCrMo (cobalt chromium molybdenum) alloy is first coated with 180 # , 400 # , 800 # , 1200 # The surface roughness of the CoCrMo (cobalt chromium molybdenum) alloy is reduced to below 15nm by mechanical polishing. After polishing, the CoCrMo (cobalt chromium molybdenum) alloy is immersed in an alcohol solvent and ultrasonically cleaned for 20 minutes to remove the surface roughness of the alloy surface. Dirt, and then dried in a drying oven at 60°C for 10 hours, and set aside; put the dried medical CoCrMo (cobalt chromium molybdenum) alloy into the reaction chamber of the ion nitriding furnace, and vacuumize the reaction chamber. When the pressure in the reaction chamber is lower than 0.1Pa, argon gas is introduced into the reaction chamber to clean the alloy by sputtering. The cleaning is carried out synchronously during the heating process of the reaction chamber. When cleaning, the pressure in the reaction chamber is 15...

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Abstract

The invention provides a surface ion nitriding method for a medical CoCrMo alloy. The method comprises the following steps of: firstly, polishing the surface of the CoCrMo alloy ground by waterproof abrasive paper, performing ultrasonic cleaning by using alcohol and deionized water, drying for later use; secondly, cleaning the CoCrMo alloy serving as a substrate with argon; and finally, forming a nitride ceramic layer on the surface of the CoCrMo alloy with pure NH3 (ammonia) serving as a gas source by ionic nitriding technology. The nitride layer consists of Cr2N (dichromium nitride) and CrN (chromium nitride) compounds with a compact nanostructure. The surface hardness of the CoCrMo alloy is improved to a certain degree. The nitride layer penetrates into the crystal boundary of the CoCrMo alloy and forms an interlaced net structure with the substrate. The method is simple in process and easy to popularize, effectively improves the wear resistance of the CoCrMo alloy, reduces the release of toxic Co (cobalt) and Cr (chromium) ions, solves the failure problem and has great application potential in the field of biomedicine and the like.

Description

technical field [0001] The invention relates to a surface ion nitriding method, especially a medical CoCrMo (cobalt chromium molybdenum) suitable for preparing a hard nitride ceramic layer and realizing metal surface ceramization to improve its wear resistance and use safety Alloy surface ion nitriding method. Background technique [0002] CoCrMo (cobalt chromium molybdenum) alloy is a solid solution formed with cobalt as the basic component. More chromium in the alloy can form thin and dense Cr on the surface of the alloy. 2 o 3 (chromium oxide) oxide layer, improving the corrosion resistance and wear resistance of the alloy. Although CoCrMo (cobalt chromium molybdenum) alloy has been widely used in the manufacture of artificial hip and knee prostheses due to its good biocompatibility, corrosion resistance and wear resistance, there are still CoCrMo (cobalt chromium molybdenum) alloys clinically. The wear of the alloy and the release of metal ions Co (cobalt), Cr (chrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/36C23C8/02
Inventor 张磊王庆良董建东张绪平孙彦敏
Owner CHINA UNIV OF MINING & TECH
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