CN105132840A - Method for enhancing hyperelasticity of medical beta-titanium alloy by laser quenching technology - Google Patents
Method for enhancing hyperelasticity of medical beta-titanium alloy by laser quenching technology Download PDFInfo
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Abstract
The invention provides a method for enhancing hyperelasticity of medical beta-titanium alloy by laser quenching technology, that is, the semiconductor laser quenches the surface of medical beta-titanium alloy for one time with the following laser quenching parameter: power being 450-600w, and scanning speed being 6-16mm/s. The laser quenching technology dramatically promotes the beta-titanium alloy hyperelasticity, and the beta-titanium alloy has a smooth and even surface after surface modification and doesn't need surface fine processing for subsequent processing.
Description
Technical field
What the present invention relates to is a kind of surface modifying method of the low elastic modulus medical beta titanium alloy for Srgery grafting field, laser quenching process for treating surface is specifically adopted to carry out surface modification to Ti-35Nb-2Ta-3Zr (wt.%) beta-titanium alloy, by laser-quenching technique, improve the elastic performance of medical beta titanium alloy.
Background technology
Phase early 1950s, at UK and USA, first pure titanium is used to manufacture the bio-medical materials such as Steel Plate For Fixation Of Fracture, hip joint, intramedullary nail and screw.But clinical discovery, the intensity of the hip joint that pure titanium manufactures and intramedullary nail, rigidity is obviously not enough.From nineteen nineties, the development of new titanium alloy just becomes the developing focus of medical material.But, if the Young's modulus of titanium alloy is too high, is placed in organism and easily produces " stress shielding " effect.Required by titanium alloy does not just have its biocompatibility, solidity to corrosion etc. in the application of biomedical aspect, on the basis ensureing biological safety, also there is concrete requirement to its mechanical property.
The bio-medical titanium or titanium alloy of current preparation also also exist as low in hardness, high thermal resistance is poor, electroconductibility and the defect such as weldability is bad, wear resistance is bad, due to the singularity of its Application Areas, also higher to the performance requriements of its material.Usually we need to adopt the method for surface treatment or surface modification to improve the service performance of titanium or titanium alloy, mainly through technology such as micro-arc oxidation, carburizing treatment, collosol and gel, vapour deposition, plasma spraying, ion implantation, friction Stir, surface treatment or modification are carried out to titanium or titanium alloy in prior art, but effect not very desirable.Therefore, develop a kind of new surface treatment or method of modifying to improve the elastic performance of bio-medical titanium or titanium alloy, make it meet service requirements, will have broad application prospects.
Summary of the invention
For limitation of the prior art, the object of this invention is to provide a kind of method that laser quenching technology strengthens medical beta titanium alloy elastic performance.This technology is applied in the medical beta titanium alloy of self-control research and development, and this beta-titanium alloy has low elastic modulus, nontoxicity, for implanting surgery medical field.For prior art and application requiring, by laser quenching technology to medical beta titanium alloy surface modification, improve the elastic performance of material.
The present invention is achieved by the following technical solutions:
The invention provides a kind of laser quenching technology and prepare the method strengthening medical beta titanium alloy elastic performance, comprise the following steps:
A (), material surface process: by beta-titanium alloy surface finish scale removal, aligning after mill-annealed, ensure smooth surface and planeness simultaneously, then clean to keep specimen surface with acetone cleaning;
(b), fixing processing sample: sample fixture is fixed on the worktable of semi-conductor laser equipment, through surface that step (a) processes upward, and the processing parameter of laser quenching is set, ensure in the course of processing that laser quenching process in which materials is not oxidized;
(c), material surface process: laser quenching surface modification is carried out to the medical beta titanium alloy after fixing in step (b); With argon shield in the course of processing, processing passage is 1 passage.Titanium alloy has inspiratory feature in Process of Surface Modification, with argon shield in the course of processing, effectively prevent titanium alloy and contacts with air in melting process and corrode.
Preferably, the composition of described medical beta titanium alloy and mass percent are: Nb:35%, Ta:2%, Zr:3%, Ti:60%.Nb:35％,Ta:2％,Zr:3％，Ti:60％。In beta-titanium alloy, adding of the elements such as Nb, Ta, Zr has good biocompatibility on the one hand, can reduce or avoid the toxic action that can cause health that implants for a long time, become the emphasis of medical beta titanium alloy developing material; On the other hand, with Ti-Nb, Ti-Ta, Ti-Zr is that the beta-titanium alloy of matrix is compared other conventional titanium alloys, lower Young's modulus and the intensity of Geng Gao can be obtained, can reduce or avoid titanium alloy to have larger Young's modulus, implant and cause " stress shielding " phenomenon.So the beta titanium alloy material of proportioning has larger medical potentiality.
Beta-titanium alloy structure is Ti-35Nb-2Ta-3Zr.Due to adding of Nb, Ta and Zr element, this beta titanium alloy has the advantage of low elastic modulus and biocompatibility (nontoxic).
Preferably, the preparation method of described beta-titanium alloy Ti-35Nb-2Ta-3Zr comprises:
The content of step one, employing vacuum consumable smelting technical project Nb, Ta and Zr, compression moulding after mixing with titanium sponge, and ingot casting is at least quenched twice;
Step 2, by the ingot casting after quenching after machining with argon arc welding and supporting electrode seam, again in vacuum consumable electrode arc furnace melting;
Step 3, by the spindle after melting 950 DEG C of forge hots, remove material surface oxide skin, at 920 DEG C ~ 950 DEG C, the process of distortion after annealing be rolled to material.
Preferably, in order to ensure the hardening capacity of laser quenching, the beta-titanium alloy thickness after the described mill-annealed of step (a) is 0.5 ~ 1mm.
Preferably, the annealing time of the described mill-annealed of step (a) is 3 ~ 5min, to obtain original state tissue.
Preferably, in described step (b), the laser type of employing is ROFINDL035Q semiconductor laser, and laser peak power is 3.5 kilowatts, and the wavelength of its Output of laser is 808nm ~ 940nm.
Preferably, in described step (b), the processing parameter of laser quenching is power 450W ~ 600W, sweep velocity 6 ~ 16mm/s.When laser power is less than 450W and sweep velocity is less than 6mm/s, the modified layer generation melting and refreezing of beta-titanium alloy is solid, can not form quenching structure.
Preferably, in described step (c), laser beam energy distribution when carrying out laser quenching is that slow-axis direction becomes high cap to distribute, and is Gaussian distribution at quick shaft direction.
Preferably, in described step (c), when carrying out laser quenching, laser spot place spot is rectangle, and it is of a size of 2.0mm × 3.3mm; The distance on laser apparatus and beta-titanium alloy surface is 5mm.
Preferably, in described step (c), the gas flow of argon gas is set as 20 ~ 30L/min.
Laser Cladding of the present invention is the one of laser surface modification method, and Laser Surface Modification Technology can improve material surface performance, in the raising materials'use life-span, have outstanding superiority.Modified layer thinning ratio after Laser Surface Modification Technology process is low, and modified layer thickness easily controls, and modified layer and matrix are in firmly metallurgical binding, and laser surface modification processing speed is fast, heat affected zone is little, can not cause the change of body material performance and size.Adopt laser quenching technology mainly to utilize the laser beam of high-energy-density, material surface is heated to more than transformation temperature, material is cooled fast, austenitic transformation is martensite, thus the mechanical property of material is changed.
The present invention carries out surface modification by laser quenching technology to self-control beta-titanium alloy Ti-35Nb-2Ta-3Zr; for titanium alloy, there is in Process of Surface Modification inspiratory feature; prevent from titanium alloy from contacting with air in melting process to be oxidized, experiment shows that shield gas flow rate is set as that 20-30L/min is comparatively suitable.The case depth of laser surface hardening is generally 0.3 ~ 1.5mm, and according to the thickness range of titanium alloy in this patent, in order to ensure the hardening capacity of material, quenching times is 1 passage.By laser quenching technology, the super-elasticity research of beta-titanium alloy is found, bring out by laser quenching the super elastic characteristics that the martensite interface movement that formed and reorientation cause material.
Compared with prior art, the present invention has following beneficial effect:
1, method of the present invention carries out laser quenching on medical beta titanium alloy surface, significantly improves the elastic performance of titanium alloy.
2, method of the present invention is simple to operation, and process cycle is short, does not need extra quenchant, and workpiece deformation is little, modified layer smooth pieces, without the need to carrying out follow-up precision work process.There is very large marketing and using value.
3, the homemade medical beta titanium alloy of the present invention, due to its specific composition and weight ratio, compared with the beta-titanium alloy of prior art, has the advantage of low elastic modulus, high strength, erosion resistance and biocompatibility.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the elastic performance of medical beta titanium alloy mother metal;
Fig. 2 is the elastic performance of medical beta titanium alloy after laser quenching;
Fig. 3 is the macroscopical metallograph of medical beta titanium alloy after laser quenching;
Fig. 4 is the metallographic structure figure of medical beta titanium alloy mother metal;
Fig. 5 is the metallographic structure figure of medical beta titanium alloy after laser quenching;
Fig. 6 is the surface reforming layer figure adopting friction stir welding method to obtain;
Fig. 7 is the macroscopical metallograph of medical beta titanium alloy after laser quenching of comparative example 2.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
embodiment 1
The present embodiment relates to a kind of laser quenching technology that adopts to medical beta titanium alloy surface modification, and concrete steps are as follows:
(a), surface treatment: the medical beta titanium alloy surface finish scale removal by thickness after mill-annealed being 1mm, is polished down to smooth state with sander by material surface; The annealing time of described mill-annealed is 3 ~ 5min.
(b), installation processing sample: sample fixture is fixed on the worktable of semi-conductor laser equipment, and sets each processing parameter of processing; The processing parameter of design laser quenching processing: laser quenching power is 500W, and sweep velocity is 12mm/s.
(c), material surface modifying: laser quenching surface modification is carried out to the medical beta titanium alloy confirmed in step (b); Shown in sample procedure of processing (a), with argon shield in the course of processing, flow is 20L/min, and the distance of laser apparatus and workpiece surface is 5mm, and laser sweeps 1 passage soon.
The composition of described medical beta titanium alloy and mass percent are: Nb:35%, Ta:2%, Zr:3%, Ti:60%; Its preparation method comprises: the content adopting vacuum consumable smelting technical project Nb, Ta and Zr, compression moulding after mixing with titanium sponge, and is at least quenched twice by ingot casting; Ingot casting after quenching is used argon arc welding and supporting electrode seam, again in vacuum consumable electrode arc furnace melting after machining; By the spindle after melting 950 DEG C of forge hots, remove material surface oxide skin, at 920 DEG C ~ 950 DEG C, the process of distortion after annealing is rolled to material.
The super elastic characteristics of sample is represented by pure recoverable strain and superelastic strain.In uninstall process, unloading curve is made up of linear processes two portions, and this linear elastic recovery strain is pure recoverable strain (E); But not the strain that the Linear Recovery stage causes is superelastic strain (SE).Fig. 1 and the elastic performance contrast that Figure 2 shows that medical beta titanium alloy mother metal and the medical beta titanium alloy after laser quenching.Comparison diagram 1, Fig. 2 are known, and after laser quenching, the elastic performance of titanium alloy significantly improves.
embodiment 2
Adopt laser quenching process to medical beta titanium alloy surface modification, concrete steps are with reference to embodiment 1, as follows with the difference of embodiment 1:
After mill-annealed, thickness is the medical beta titanium alloy laser-quenching technique parameter of 0.8mm: laser quenching power is 450W, and sweep velocity is 6mm/s, argon shield, and flow is 20L/min.Figure 3 shows that medical beta titanium alloy carry out 1 passage laser quenching after macroscopical metallograph.As shown in Figure 3, after laser quenching process, formed above-mentioned martensitic while, the crystal grain of titanium alloy is obviously grown up, and smooth surface clean, organize more even.
embodiment 3
Adopt laser quenching process to medical beta titanium alloy surface modification, concrete steps are with reference to embodiment 1, as follows with the difference of embodiment 1:
After mill-annealed, thickness is the medical beta titanium alloy laser-quenching technique parameter of 0.5mm: laser quenching power is 600W, and sweep velocity is 16mm/s, argon shield, and flow is 30L/min.Similarly improve the superelastic properties of titanium alloy.Fig. 4 and the metallographic structure figure that Figure 5 shows that medical beta titanium alloy mother metal and the medical beta titanium alloy after laser quenching.Comparison diagram 4 and Fig. 5 known, after laser quenching, the more martensite of the organization formation of titanium alloy, this is the major cause improving titanium alloy elastic performance.
comparative example 1
Adopt the friction stir welding method of prior art to carry out surface modification to medical beta titanium alloy described in embodiment 1, as shown in Figure 6, the coarse injustice of face of weld of acquisition, can not directly apply the surface reforming layer of acquisition, needs to carry out follow-up surface finishing; And the modified layer any surface finish utilizing laser-quenching method to obtain is level and smooth, directly can applies, decrease the technique of surface finishing.
comparative example 2
Adopt laser remolten process to medical beta titanium alloy surface modification described in embodiment 1, concrete steps are with reference to embodiment 1, and difference is as follows:
After mill-annealed, thickness is the medical beta titanium alloy laser-quenching technique parameter of 0.8mm: laser quenching power is 400W; when sweep velocity is 2mm/s, when argon shield and flow are 20L/min, titanium alloy surface melts; quenching structure can not be obtained, as shown in Figure 7.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. laser quenching technology prepares the method strengthening medical beta titanium alloy elastic performance, it is characterized in that, comprises the following steps:
A, material surface process: by medical beta titanium alloy surface finish scale removal, aligning after mill-annealed, then clean with acetone;
B, fixing processing sample: be fixed on by sample on the worktable of semi-conductor laser equipment, treated surface, and arranges the processing parameter of laser quenching upward;
C, material surface process: under argon shield, carry out laser quenching surface modification to medical beta titanium alloy, processing passage is 1 passage.
2. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, the composition of described beta-titanium alloy and mass percent are: Nb:35%, Ta:2%, Zr:3%, Ti:60%.
3. laser quenching technology as claimed in claim 1 or 2 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, the preparation method of described beta-titanium alloy comprises:
The content of step one, employing vacuum consumable smelting technical project Nb, Ta and Zr, compression moulding after mixing with titanium sponge, and ingot casting is at least quenched twice;
Step 2, by the ingot casting after quenching after machining with argon arc welding and supporting electrode seam, again in vacuum consumable electrode arc furnace melting;
Step 3, by the spindle after melting 950 DEG C of forge hots, remove material surface oxide skin, at 920 DEG C ~ 950 DEG C, the process of distortion after annealing be rolled to material.
4. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, the beta-titanium alloy thickness after mill-annealed described in step a is 0.5 ~ 1mm.
5. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, the annealing time suppressing annealing described in step a is 3 ~ 5min.
6. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, in described step b, the wavelength of the Output of laser of semi-conductor laser equipment is 808nm ~ 940nm.
7. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, in described step b, the processing parameter of laser quenching is power 450W ~ 600W, sweep velocity 6 ~ 16mm/s.
8. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, it is characterized in that, in described step c, laser beam energy distribution when carrying out laser quenching, for become high cap to distribute at slow-axis direction, is Gaussian distribution at quick shaft direction.
9. laser quenching technology as claimed in claim 1 prepare the method for enhancing medical beta titanium alloy elastic performance, it is characterized in that, in described step c, when carrying out laser quenching, laser spot place spot is rectangle; The distance on laser apparatus and beta-titanium alloy surface is 5mm.
10. laser quenching technology as claimed in claim 1 prepares the method strengthening medical beta titanium alloy elastic performance, and it is characterized in that, in described step c, the gas flow of argon gas is set as 20 ~ 30L/min.
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|---|---|---|---|---|
| CN109989059A (en) * | 2019-03-06 | 2019-07-09 | 莆田学院 | A kind of TiBw-Ti composite layer and its laser in-situ preparation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084714A (en) * | 2013-02-03 | 2013-05-08 | 梁建波 | Laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets |
-
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084714A (en) * | 2013-02-03 | 2013-05-08 | 梁建波 | Laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets |
Non-Patent Citations (4)
| Title |
|---|
| 戴振东等: "面扫描激光淬火对钛合金微动磨损性能的影响", 《摩擦学学报》 * |
| 王中林等: "《激光加工设备与工艺》", 30 September 2011 * |
| 王洪奎: "浅谈激光表面处理技术及应用", 《电镀与精饰》 * |
| 王立强: "TiNbZrTaβ钛合金冷变形特点及超弹性机理研究", 《中国博士学位论文全文数据库 工程科技I辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989059A (en) * | 2019-03-06 | 2019-07-09 | 莆田学院 | A kind of TiBw-Ti composite layer and its laser in-situ preparation method |
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