CN1115424C - Method for raising crystallinity of hydroxyapatite coating layer in plasma spraying process - Google Patents
Method for raising crystallinity of hydroxyapatite coating layer in plasma spraying process Download PDFInfo
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- CN1115424C CN1115424C CN 99124034 CN99124034A CN1115424C CN 1115424 C CN1115424 C CN 1115424C CN 99124034 CN99124034 CN 99124034 CN 99124034 A CN99124034 A CN 99124034A CN 1115424 C CN1115424 C CN 1115424C
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Abstract
The present invention relates to a method for improving the crystallinity degree of a plasma spraying hydroxyapatite coating, which belongs to the bioceramic coating field. The method for improving the crystallinity degree realizes the purpose for improving the crystallinity degree in a course that after a coating spraying course is finished, plasma flames are used as a heat source, a water vapour generator is used while the coating is baked, and water vapour is ejected towards the coating surface through a water vapour passage pipe. Obviously, the method provided by the present invention has the characteristics of simplicity, practicability, remarkable effects, etc.
Description
The present invention relates to a kind of method that improves hydroxyapatite coating layer degree of crystallinity, improve the method for crystallinity of hydroxyapatite coating layer in plasma spraying more precisely, belong to the medical bio field of ceramic coatings.
From the seventies initial stage the U.S. and Japanese scholar report artificial-synthetic hydroxyapatite (hydroxyapatite in succession, be abbreviated as HA), and found that since this material superior bioactive and the consistency, hydroxyapatite and goods thereof become the research focus of material and clinical medicine subject gradually.Hydroxyapatite has with skeleton organizes identical Ca/P ratio.After it implants, under humoral effect, calcium in the material and phosphorus and body tissue reaction, and promote peripheral neoblastic growth, thus obtain early stage preferably constant intensity, shorten healing time, alleviate patient's misery.
In numerous hydroxyapatite coating layer preparation technologies, plasma spraying be a kind of fast, coating depositing operation efficiently.But in preparation process, the hydroxyapatite powder is by high-temperature plasma (flame temperature is up to 10000K) heating and fusing, and part of hydroxyl phosphatic rock is decomposed into Ca
10(PO
4)
6O (being abbreviated as OHA), α-Ca
3(PO
4)
2(α-TCP), β-Ca
3(PO
4)
2(β-TCP), Ca
4P
2O
9(TTCP), CaO and amorphous phase.Forefathers research points out that the degradation rate of the HA of crystalline state in body fluid is lower than the degradation rate of non-crystalline state HA and β-TCP, TTCP etc., shows advantages of higher stability, can prolong implant work-ing life in vivo.For this reason, numerous scholars have launched research with regard to the degree of crystallinity that how to improve hydroxyapatite coating layer in plasma spraying, have proposed aftertreatment technologys such as heat treating process (comprising under atmosphere and the vacuum atmosphere) and laser method.Though these methods can improve the degree of crystallinity of hydroxyapatite coating layer effectively, technology is complicated, and length consuming time need be put specific equipment etc. in addition.
The invention provides a kind of method that improves crystallinity of hydroxyapatite coating layer in plasma spraying, and need not the special-purpose finishing apparatus introduced as document, have technology easy, efficient, be suitable for characteristics such as suitability for industrialized production.
The understanding that raising degree of crystallinity method of the present invention is based on the thermolysis mechanism of article on plasma spraying hydroxyapatite coating proposes.Inventor of the present invention recognizes that it mainly is because the dehydration process and the decrystallized process of powder dehydroxylation cause that plasma spraying HA coating degree of crystallinity reduces.For this reason, desire improves the degree of crystallinity of HA coating, and only need to set about from following 2: (1) makes non-crystalline state HA recrystallization; (2) make α-TCP, β-TCP, TTCP, OHA and CaO etc. be converted into HA.
The method that the present invention improves crystallinity of hydroxyapatite coating layer in plasma spraying is after spraying process is finished, with plasma flame is thermal source, when being toasted, coating provides water vapor, make it and reactions such as hydroxyapatite degradation production α-TCP, β-TCP, TTCP, OHA and CaO, regenerate hydroxyapatite crystal, thereby improve the degree of crystallinity of coating.
Synoptic diagram shown in Figure 1 is design of the present invention.
1 is plasma gun among the figure; 2 for clamping workpiece, is used for clamping the workpiece of wish spraying; 3 are the water steaming The tube channel of vapour; 4 is turntable, clamps workpiece 2 and is placed on the turntable 4, is heated when its effect makes the workpiece baking Evenly, the baking thermal source is provided by the jet of plasma gun, and it is general with the distance of toasting between the workpiece 2 Be 70～90mm, power 30kW, water vapour tube channel one end links to each other with steam generator, another End is aimed at coating surface, constantly provides injection water steam to coating surface; When baking, turntable 4 at the uniform velocity Rotate. Stoving time is generally 7～10 minutes, and stoving time is lower than 7 minutes, and the coating crystallization is insufficient, Time, the oversize degree of crystallinity that also can make descended. Process plasma spraying hydroxyl phosphorus through method provided by the invention Lime stone coating degree of crystallinity is brought up to more than 80% from common 50～62%, can satisfy degree of crystallinity greater than 70% Clinical instructions for use.
Degree of crystallinity is measured by the X-ray diffraction quantitative analysis.
The characteristics such as raising degree of crystallinity method of the present invention has easy, easy row, and effect is remarkable.
Further illustrate characteristics of the present invention and effect below by embodiment.Limit the present invention by no means.
Embodiment 1 hydroxyapatite coating layer in plasma spraying, degree of crystallinity is 61.3% before the baking, through method provided by the invention, utilize steam generator in baking, provide injection water steam by the water vapor passage pipe to coating, storing time is 7 minutes, utilize plasma flame to be thermal source, power is 30kW, and by turntable uniform rotation constantly, the distance between baking thermal source and the coating is 70mm.Hydroxyapatite coating layer degree of crystallinity brings up to 98.7% after treatment, can satisfy clinical service requirements, and good reproducibility.
The degree of crystallinity of embodiment 2 baking Front-coating mirrors is 60.4%.In baking, utilize steam generator, constantly provide injection water steam to coatingsurface by the water vapor passage pipe, the distance between baking thermal source and the coating was 70mm, through baking in 10 minutes, make coating degree of crystallinity bring up to 90.6%, can satisfy clinical service requirements.All the other processing condition are with embodiment 1.
Claims (5)
1, a kind of method that improves crystallinity of hydroxyapatite coating layer in plasma spraying, after it is characterized in that the coating spraying process is finished, utilize plasma flame to be thermal source, when coating is toasted, utilize steam generator, by the water vapor passage pipe, to coatingsurface injection water steam.
2, by the method for the described raising coating of claim 1 degree of crystallinity, it is characterized in that described baking coating clamps with clamping workpiece, storing time is 7～10 minutes.
3, by the method for the described raising coating of claim 2 degree of crystallinity, clamp workpiece when it is characterized in that toasting and be placed on the turntable, turntable is done uniform rotation.
4, by the method for the described raising coating of claim 1 degree of crystallinity, it is characterized in that described plasma flame power of heat source is 30kw, it with the baking coating between apart from being 70～90mm.
5, by the method for the described raising coating of claim 1 degree of crystallinity, it is characterized in that described water vapor passage pipe one end connects steam generator, an end is aimed at coatingsurface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124034 CN1115424C (en) | 1999-11-19 | 1999-11-19 | Method for raising crystallinity of hydroxyapatite coating layer in plasma spraying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124034 CN1115424C (en) | 1999-11-19 | 1999-11-19 | Method for raising crystallinity of hydroxyapatite coating layer in plasma spraying process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1254031A CN1254031A (en) | 2000-05-24 |
| CN1115424C true CN1115424C (en) | 2003-07-23 |
Family
ID=5283131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99124034 Expired - Fee Related CN1115424C (en) | 1999-11-19 | 1999-11-19 | Method for raising crystallinity of hydroxyapatite coating layer in plasma spraying process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1115424C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348276C (en) * | 2004-11-18 | 2007-11-14 | 山东大学 | Surface nanocrystallization method for hydroxyapatite coating |
| CN101584881B (en) * | 2009-06-26 | 2012-11-21 | 北京工业大学 | Composite hydroxylapatite coating layer and preparing method thereof |
-
1999
- 1999-11-19 CN CN 99124034 patent/CN1115424C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1254031A (en) | 2000-05-24 |
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