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Post-treatment method for plasma spraying hydroxyapatite coating

A technology of hydroxyapatite and plasma, which is applied in the field of biomedical material processing, can solve the problems of reducing the bonding strength between the coating and the metal base material, poor mechanical properties of the base metal material, and inability to transform into hydroxyapatite, etc., to achieve The effect of overcoming adverse effects, good use effect and low product cost

Inactive Publication Date: 2004-03-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: A. It can only convert the amorphous hydroxyapatite of the coating into crystalline hydroxyapatite, and cannot convert impurities such as oxyapatite and tricalcium phosphate into hydroxyl Apatite phase; B. Since the coating and the substrate have to be treated at 630°C for half an hour, it will have some adverse effects on the mechanical properties of the base metal material; C. Due to the thermal expansion coefficient of hydroxyapatite ceramics and the metal The thermal expansion coefficient of the base material has a large difference. After heat treatment at 630°C, the bonding strength between the coating and the metal base material is reduced; D. This method usually needs to be processed under vacuum conditions to avoid the metal base material being damaged. Oxidation or nitriding, which puts higher requirements on the equipment used, thus increasing the product cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the hydroxyapatite coating product prepared by plasma spraying into the container, and the container is connected with the steam generator, and the steam generator generates water vapor and passes it into the container, and then the water vapor in the container is heated and increased The water vapor pressure in the container is such that the temperature of the water vapor in the container is maintained at 125° C., and the pressure is 1.5 atmospheres, and is processed under this saturated water vapor pressure for 6 hours. Then take out the product, put it into an oven with a temperature of 150°C and bake it for 0.5 hours.

Embodiment 2

[0032] Put the hydroxyapatite coating product prepared by plasma spraying into the container, and pass in the water vapor generated by the steam generator to heat the water vapor in the container, so that the temperature of the water vapor in the container is 300°C, and the pressure is The pressure is 1 atmosphere, and it is processed under this saturated water vapor pressure for 3 hours, then the product is taken out, put into an oven with a temperature of 100°C and baked for 2 hours.

Embodiment 3

[0034] The hydroxyapatite coating product prepared by plasma spraying is put into the container, and the water vapor generated by the steam generator is introduced to heat the water vapor in the container and increase the water vapor pressure in the container, so that the water in the container The temperature of the steam is 200°C, and the pressure is 3 atmospheres of saturated steam pressure for 2 hours, then take out the product, put it in the oven, adjust the temperature of the oven to 125°C, and dry it for 1 hour.

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PUM

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Abstract

The present invention relates to an aftertreatment method of plasma spray-coated hydroxypatite coating, and is characterized by that the hydroxyapatite coating product obtained by adopting plasma spray-wating process is placed in a container connected with the steam generator, then said steam in the container is heated or (and) pressurized to make the hydroxyapatite coating product undergo the process of treatment for 2-6 hr. under the moist steam whose temp. is 100 deg.C-300 deg.C and pressure is 1-3 atms, then said hydroxyapatite coating product can be taken out and placed into the baking oven with 100-150 deg.C and baked for 0.5-2 hr. so as to implement its aftertreatment.

Description

1. Technical field [0001] The invention relates to the treatment technology of biomedical materials, in particular to a post-treatment method of plasma spraying hydroxyapatite coating. 2. Background technology [0002] Hydroxyapatite (HA) is the main inorganic part of human teeth and bone tissue. It has excellent biocompatibility and can form a direct chemical bond with bone and soft tissue. Therefore, hydroxyapatite ceramics are widely used in bone defects. filling etc. However, like most ceramic materials, the brittleness of bulk hydroxyapatite ceramics and its fatigue failure in the physiological environment can only be used for bone repair and replacement without bearing or only under pressure, and cannot be used as a bearing. The material is used clinically. Metals have excellent mechanical properties and have been widely used in clinics as load-bearing materials such as joints. However, since the metal material is biologically inert, it cannot form a direct chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/32
Inventor 曹阳陈继镛冯家珉叶启玉李旭东翁杰童伟东张兴栋
Owner SICHUAN UNIV
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