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Treatment method of zirconium alloy and application

A treatment method and technology of zirconium alloy, applied in the field of medical implant materials, can solve the problems of many micro-cracks and low density of the oxide ceramic layer of zirconium alloy, and achieve the effect of strong market competitiveness, low cost and reduction of raw material cost.

Active Publication Date: 2020-05-08
SUZHOU MICROPORT ORTHORECON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention provides a method and application for reducing the content of hafnium on the surface of zirconium alloy to solve the problem of many microcracks and low density of zirconium alloy oxide ceramic layer

Method used

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  • Treatment method of zirconium alloy and application
  • Treatment method of zirconium alloy and application
  • Treatment method of zirconium alloy and application

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Experimental program
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Effect test

preparation example Construction

[0040] The preparation process of the material for medical implants is as follows: figure 2 The specific implementation steps are as follows:

[0041] (1) Surface oxidation treatment is performed on the first surface layer 40 of the zirconium alloy metal substrate 30 with a hafnium element content of 0.5wt%-8wt%. Water bath or salt bath for surface oxidation, the oxidation temperature is 500℃-700℃, the treatment time is 0.5h-10h, the preferred oxidation temperature is 550℃-600℃, and the preferred treatment time is 4-6h, the surface of which is enriched with hafnium is formed. The first oxide surface layer 41 is composed of the oxygen-rich diffusion layer 20 and the oxide ceramic layer 10 .

[0042] (2) the first oxide surface layer 41 enriched with hafnium is removed by grinding, finishing, mechanical polishing, vibration polishing or any combination thereof, with a thickness of 1-20 μm, preferably a thickness of 3-12 μm, The second surface layer 42 having a reduced hafnium...

Embodiment 1

[0048] For zirconium alloys with hafnium content image 3 and Figure 4 As shown, the oxide ceramic layer, the oxygen-rich diffusion layer, and the metal substrate are arranged from left to right. from image 3 It can be seen that the surface oxide ceramic film of sample 1 is dense and has fewer defects, while Figure 4 It shows that there are a lot of microcracks in the surface oxide ceramic layer of sample 2. From the results of elemental analysis, the surface oxide ceramic layer (position a, b) of sample 2 and the oxygen-rich diffusion layer (position c) have higher content The hafnium content is 1.53wt%, 1.80wt%, 2.09wt%, respectively, while the hafnium content (1.30wt%) near the substrate (position d) of the oxide ceramic layer is significantly lower than the initial hafnium of the alloy content (2.26 wt%). The oxidized ceramic layer on the surface of sample 2 was removed by mechanical grinding, polishing, etc., to a thickness of about 10 μm, that is, the oxidized cera...

Embodiment 2

[0052] For zirconium alloys with hafnium content Figure 9 and Figure 10 As shown, the oxidized ceramic layer, oxygen-rich diffusion layer and metal substrate are arranged from left to right. Compared with sample 5, the surface of the oxidized ceramic layer of sample 4 is dense and tightly bonded with the substrate, and the bonding interface has no gaps. The layer thickness is about 9.66 μm; the oxidized ceramic layer of sample 5 is slightly thicker, about 10.51 μm, but the inside of the oxidized ceramic layer is loose, and there are a lot of micro-cracks, and even the inside of the oxidized ceramic layer has a tendency to crack, and the interface with the substrate is also better. Poor, obvious gaps are visible. The oxidized ceramic layer and oxygen-rich diffusion layer on the surface of sample 5 were removed by mechanical grinding, polishing and other means to a thickness of about 12 μm. After that, they were kept in an air environment at 600 °C for 4 h to obtain sample 6. ...

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Abstract

The invention belongs to the technical field of medical implant materials, and particularly relates to a method for reducing the hafnium content in a surface oxidation ceramic layer of zirconium alloyand application. The method comprises the following steps that the zirconium alloy surface layer is subjected to multiple times of cyclic process treatment of oxidation and surface layer removal tillthe hafnium element content in the oxidized ceramic layer is 0.3 wt%-6 wt%, the cyclic process of oxidation and surface layer removal comprises the following steps that the surface layer is subjectedto oxidation treatment, then the oxide surface layer is removed, and a new surface layer is exposed. According to the technical scheme, the hafnium oxide content of the surface oxidation ceramic layer of the high-hafnium-content zirconium alloy can be reduced, so that the problem of microcracks in the surface oxidation ceramic layer of the high-hafnium-content zirconium alloy is solved, the wearresistance, the hardness and the damage resistance performance of the oxidation ceramic layer are improved, in addition, compared with the mode that expensive zirconium alloy with low hafnium contentis directly used as a raw material, the cost of the raw material is greatly reduced under the condition of equivalent performance, and the market competitive advantage is stronger.

Description

[0001] This case is a divisional application, the application number of the original application is 201910172951.X, the application date is March 7, 2019, and the name of the invention is "treatment method and application of zirconium alloy". technical field [0002] The invention belongs to the technical field of medical implant materials, and particularly relates to a method and application for reducing the content of hafnium element in an oxidized ceramic layer on the surface of a zirconium alloy. Background technique [0003] Medical implant materials need to have both high strength, corrosion resistance and tissue compatibility. Some metal alloys are ideal materials that meet this feature, such as 316L stainless steel, cobalt-chromium-molybdenum alloy, titanium alloy and in recent years are considered the most Zirconium alloy suitable for the manufacture of load-bearing and non-load-bearing prosthetic materials. [0004] The surface hardness of zirconium alloy is usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/10C23C8/42C23C8/80C22C16/00A61L31/12A61L31/08A61L31/02
CPCC23C8/10C23C8/42C23C8/80C22C16/00A61L31/088A61L31/022C23C8/02C22F1/186A61L27/047A61L27/306A61L2430/24
Inventor 申宇俞天白翁资欣
Owner SUZHOU MICROPORT ORTHORECON CO LTD
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