Degradable high-strength Zn-Ti layered composite material as well as preparation method and application thereof

Abstract

The invention discloses a preparation method and application of a degradable high-strength Zn-Ti layered composite material, two Zn plates and a Ti foil are taken, the Ti foil is placed between the two Zn plates to obtain a composite plate, the composite plate is cold-rolled for the first time to obtain a cold-rolled plate, the cold-rolled plate is cut into two pieces from the middle, and the two pieces are stacked and then cold-rolled again to obtain the degradable high-strength Zn-Ti layered composite material. According to the preparation method, the Zn plate and the Ti foil serve as raw materials for the first time, and the Zn-Ti layered composite material with the excellent mechanical property is successfully prepared through accumulative ply rolling.

Description

Technical Field

[0001] The invention belongs to the technical field of biodegradable zinc alloys, and particularly relates to a degradable high-strength Zn-Ti layered composite material and a preparation method and application thereof. Background Art

[0002] Degradable biomedical metal materials are mainly divided into magnesium-based, iron-based and zinc-based degradable metals. Magnesium alloys have the disadvantages of too fast degradation rate and hydrogen precipitation during degradation, while iron alloys have the disadvantages of too slow degradation rate and ferromagnetism that interferes with MRI examinations. The electrode potential of zinc is between magnesium (-2.372V) and iron (0.44V), and has a moderate degradation rate. In addition, zinc is an essential trace element for the human body, plays an important role in growth, can stimulate bone formation and mineralization, and play a role in preserving bone mass; zinc is an efficient and selective inhibitor of osteoclast bone resorption, and the zinc content in bones decreases under conditions such as aging and bone diseases; it has a good osteogenesis; the mechanical properties and degradation rate are moderate, there is no ferromagnetism, and it will not interfere with MRI examinations. Zinc alloys have good mechanical properties and biocompatibility, so they have great potential and advantages in degradable biomedical metal materials. However, the mechanical properties of pure zinc are too poor to meet the mechanical property requirements of biomedical materials. Therefore, alloying, heat treatment, plastic processing and other methods are usually used to improve its mechanical properties.

[0003] The cumulative rolling process was first proposed by Professor Y.Saito of Osaka University in Japan in 1998, and was successfully tested on pure aluminum for the first time, refining the grains to within 1μm. Cumulative rolling is a processing method that uses large-reduction cyclic rolling to cause severe deformation of metal materials and change the material structure to obtain the desired properties. After strong plastic deformation, the material structure is significantly refined, and the grain size can reach micrometer or even nanometer scale. Compared with other large plastic deformation processes, cumulative rolling technology has the advantages of low cost and simple process. It does not require the addition of alloying elements to obtain high strength. It has great advantages in reducing production costs and material density and improving the recycling performance of metal materials. It does not require special equipment. Since rolling and welding have been widely used in metal cladding production, it has high productivity and is easy to realize industrial production.

[0004] Titanium (Ti) has good biocompatibility, basically does not cause immune response and rejection reaction of the body, and can be well combined with human tissue; it has excellent corrosion resistance in physiological environment, can remain stable for a long time, and is not easily corroded by body fluids; compared with other metal materials, titanium has a smaller specific gravity, which reduces the burden of implants on the human body; it can provide sufficient mechanical strength to meet the needs of various application scenarios inside the human body; it helps new bone grow and adhere to its surface, promotes the healing and repair of bone tissue; it is non-magnetic and does not affect medical examinations such as nuclear magnetic resonance. Titanium is widely used in the manufacture of medical devices and implants such as artificial joints (such as hip joints, knee joints), fracture fixation devices (such as bone plates, bone nails), dental implants, and pacemaker housings. Even if humans ingest up to 0.8 mg of titanium per day, most of it will be excreted without harming the human body. In addition, Ti is often used as an alloying element to refine the grain size of Mg alloys.

[0005] In the prior art, although there have been reports on the preparation of zinc-based composite materials by cumulative rolling of pure zinc plates and magnesium-lithium plates, there have been no reports on the preparation of zinc-based composite materials by cumulative rolling of pure zinc plates and titanium in the prior art. Summary of the invention

[0006] In view of the shortcomings of the prior art, the first object of the present invention is to provide a method for preparing a degradable high-strength Zn-Ti layered composite material. The present invention is the first to successfully prepare a Zn-Ti layered composite material with excellent mechanical properties by using Zn plate and Ti foil as raw materials through cumulative rolling.

[0007] The second object of the present invention is to provide a degradable high-strength Zn-Ti layered composite material prepared by the above preparation method.

[0008] The third object of the present invention is to provide an application of a degradable high-strength Zn-Ti layered composite material prepared by the above preparation method.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] The invention discloses a method for preparing a degradable high-strength Zn-Ti layered composite material. The method comprises the following steps: taking two Zn plates and a Ti foil, placing the Ti foil between the two Zn plates to obtain a composite plate, subjecting the composite plate to a first cold rolling to obtain a cold-rolled plate, cutting the cold-rolled plate into two pieces from the middle, stacking the pieces, and then cold-rolling the pieces, and repeating the cutting-stacking-cold rolling to obtain the Zn-Ti layered composite material.

[0011] The preparation method of the present invention is to stack Zn plate and Ti foil and then cold roll them. The inventors found that after adding Ti foil, Ti and Zn can be metallurgically combined during the rolling process to form TiZn16 The Ti foil will be crushed during the rolling process. As the cumulative rolling progresses, the Ti foil will become smaller and smaller, and more and more evenly distributed at the interface of each layer, forming a hard TiZn 16 phase, which can pin dislocations and grain boundaries well, hinder dislocation movement and grain boundary migration, achieve the effect of second phase strengthening, and thus improve the mechanical properties.

[0012] In the present invention, the use of pure Ti foil as the Ti source is the key to successfully preparing a Zn-Ti layered composite material with a pure Zn plate only through cumulative rolling. In the actual exploration process, the inventors also tried Ti powder and Ti plate, but both failed to successfully composite with the Ti plate. For example, the use of Ti powder may cause sliding during the rolling process due to its hardness, resulting in accumulation or agglomeration, causing uneven distribution of Ti powder and affecting rolling performance. The inventors unexpectedly discovered that the thickness of Ti foil is uniform and does not cause thickness changes during the rolling process. More importantly, after the Ti foil is crushed, the stress of the zinc plate is dispersed during rolling, thereby successfully composited through rolling.

[0013] In a preferred embodiment, the purity of the Zn plate is ≥ 99.9%.

[0014] In a preferred embodiment, the purity of the Ti foil is ≥99.9%.

[0015] In a preferred solution, the thickness of the Ti foil is 5-10 μm. The inventors have found that the thickness of the Ti foil has a great influence on the final performance. The performance of the composite material obtained by using the Ti foil within the above thickness range is optimal, and too thick will lead to a decrease in mechanical properties.

[0016] In a preferred embodiment, the Zn plate is first polished with a stainless steel wire brush with a wire diameter of 0.15-0.3 mm. In the present invention, the Zn plate is first polished with a stainless steel wire brush to remove the oxide on its surface on the one hand, and on the other hand, a stainless steel wire brush with a wire diameter within the above range is used to obtain a specific roughness so that the Ti foil and the Zn plate fit better. In the actual operation process, the surface of the Zn plate is first polished with a round stainless steel brush with a wire diameter of 0.15-0.3 mm to remove the surface oxide. Then the four corners of the Zn plate are drilled, and then fixed with copper wire. Then the Zn plate is ultrasonically cleaned in acetone for 10 minutes to remove surface grease and impurities, and then blown dry with cold air from a hair dryer.

[0017] In a preferred solution, the Ti foil is first stored in a vacuum environment for standby use. The inventors found that since the Ti foil is very thin, it is impossible to polish and remove the oxide scale with a stainless steel brush. The Ti foil needs to be stored in a vacuum environment, such as a glove box, to prevent the Ti foil from contacting the air and then taken out when it is used.

[0018] The preferred solution is to drill holes at the four corners of the two Zn plates, put a piece of Ti foil between the two Zn plates, and then twist and fix them with copper wire to obtain a composite plate.

[0019] In the actual operation process, the Ti foil is taken out of the glove box, then placed between two Zn plates, and then twisted and fixed with copper wire to prevent the Zn plates and Ti foil from sliding during rolling, thereby obtaining a composite plate.

[0020] In a preferred solution, when the composite plate is subjected to the first cold rolling, the deformation is controlled to be 65%-70%.

[0021] In the present invention, the composite plate is first subjected to a single cold rolling with a large deformation of more than 65%, so that the Ti foil can be smoothly combined with the Zn plate. Since the Ti foil is not polished, the surface of the Ti foil is very smooth. If the deformation of the first cold rolling is small, the Zn plate cannot be combined, and the Ti foil will also fall out in pieces. Of course, the deformation cannot be too large. If it is too large, it will affect the mechanical properties of the composite material.

[0022] The preferred solution is to cut the cold-rolled sheet into two halves from the middle, stack them, and then cold-roll them. In the process of repeated cutting-stacking-cold-rolling, the deformation amount of any cold rolling is 50-55%.

[0023] By repeated cutting, lamination, and single-pass cold rolling, the Zn grains will be refined, the Ti foil will become smaller and more dispersed, and the second phase will be produced more, thereby improving the mechanical properties. However, the deformation amount of any single-pass cold rolling needs to be controlled within the scope of the present invention. If the deformation amount is too small, the two zinc plates will not be able to be rolled together, and if it is too large, the elongation of the mechanical properties will deteriorate.

[0024] In a preferred solution, the number of repeated cutting-stacking-cold rolling is 18-20 times. If the number of repeated cutting-stacking-cold rolling is controlled within the above range, the performance of the final composite material will be optimal. If the number of repeated cutting-stacking-cold rolling is too small, the Ti particles will not be so evenly dispersed, and the strength of the mechanical properties will be reduced. If the number of repeated cutting-stacking-cold rolling is too small, not only will the rolling difficulty increase, but also the elongation will be greatly reduced.

[0025] In a preferred embodiment, the material obtained after repeated cutting-lamination-cold rolling is subjected to annealing treatment, wherein the annealing temperature is 210° C.-230° C. and the holding time is 10-15 min.

[0026] The final plate is placed in a muffle furnace and kept at 210℃-230℃ for 10-15 minutes, and then taken out for air-cooling annealing. Its mechanical properties are further improved and it has excellent thermal stability.

[0027] The present invention also provides a degradable high-strength Zn-Ti layered composite material prepared by the above preparation method.

[0028] The present invention also provides an application of a degradable high-strength Zn-Ti layered composite material prepared by the above preparation method, and the Zn-Ti layered composite material is used as a degradable biomedical metal material.

[0029] Principles and advantages

[0030] The preparation method of the present invention is to place a piece of pure Ti foil between two pure Zn plates and then stack them for cold rolling. The inventors found that after adding the Ti foil, the Ti foil will be crushed, and the crushed Ti will be more finely and evenly distributed at the interface during the cumulative stacking process, and Ti and Zn will be metallurgically combined during the cumulative stacking process to form a hard TiZn 16 Phase, pinning dislocations and grain boundaries, hindering the movement of dislocations and grain boundaries, forming a second phase reinforcement, thereby improving the mechanical properties. In addition, the final plate is placed in a muffle furnace and kept at 210℃-230℃ for 10-15min, and then taken out for air cooling annealing, and its mechanical properties are further improved, and it has excellent thermal stability.

[0031] The invention firstly uses Zn plate and Ti foil as raw materials to successfully prepare a Zn-Ti layered composite material with excellent mechanical properties through cumulative rolling. The preparation method of the invention is simple and controllable, low in cost, and suitable for industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0033] Figure 1 1 and 2. The tensile stress-strain curve and corresponding tensile property data of the Zn-Ti layered composite material prepared in Example 1.

[0034] Figure 2 The tensile stress-strain curve of pure zinc and the corresponding tensile property data.

[0035] Figure 3 This is the metallographic structure of the Zn-Ti layered composite material obtained in Example 1.

[0036] Figure 4 This is the XRD pattern of the Zn-Ti layered composite material obtained in Example 1. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Example 1 (5 μm Ti foil)

[0039] Take two pure Zn plates with a purity of 99.9% and specifications of 50 mm long, 25 mm wide and 1.5 mm thick. First, polish the surface of the Zn plate with a round stainless steel brush with a diameter of 0.15 mm to remove the surface oxide. Then drill holes in the four corners of the Zn plate so that it can be fixed with copper wire later. Then put the Zn plate in acetone for ultrasonic cleaning for 10 minutes to remove surface grease and impurities, and then blow dry with cold air from a hair dryer. Then take out the pure Ti foil with a purity of 99.9% and specifications of 50 mm long, 25 mm wide and 5 μm thick from the glove box, place it between the two Zn plates, and then use copper wire to twist and fix it to avoid sliding of the Zn plate and Ti foil during rolling. In this way, a three-layer structure is formed to obtain a composite plate. Then, a first cold rolling is performed using a two-roll rolling mill, and the deformation of the first cold rolling is controlled to be 65%. After the first rolling is completed, the cold-rolled plate is cut into two pieces from the middle, stacked, and then cold-rolled again. The cutting-stacking-cold rolling is repeated 19 times, and the deformation amount is controlled to be 50% each time. A total of 20 rollings are performed to roll a composite plate with a thickness of 1 mm. The present invention does not require any annealing treatment during the rolling process, and the final Zn-Ti layered composite material is prepared by repeated cold rolling.

[0040] The Zn-Ti layered composite material is placed in an environment of 220°C and kept warm for 10 minutes for annealing to obtain an annealed Zn-Ti layered composite material.

[0041] In the Zn-Ti layered composite material provided in this embodiment, the volume fraction of Ti is about 0.17%, and the mass fraction is about 0.11%.

[0042] Performance Testing

[0043] The performance test includes the mechanical property test of the prepared Zn-Ti layered composite material and the mechanical property test data after the Zn-Ti layered composite material is placed in an environment of 220° C. and kept warm for 10 minutes.

[0044] Specific data

[0045] Figure 1The tensile stress-strain curve of Zn-Ti layered composite materials includes the tensile stress-strain curve of Zn-Ti layered composite materials and the tensile stress-strain curve of Zn-Ti layered composite materials after being kept in an environment of 220℃ for 10 minutes. The tensile yield strength (YS), ultimate tensile strength (UTS) and elongation at break of Zn-Ti layered composite materials are 178.9MPa, 223.2MPa and 20.0% respectively. After the Zn-Ti layered composite materials are kept in an environment of 220℃ for 10 minutes, their tensile yield strength (YS), ultimate tensile strength (UTS) and elongation at break are 287.5MPa, 306.4MPa and 10.8% respectively. It can be seen that compared with the unannealed ones, the mechanical properties are improved, and there is no obvious fluctuation in the tensile curve. The material breaks after necking during the stretching process, and there is no delamination phenomenon, showing excellent thermal stability.

[0046] Figure 2 The tensile stress-strain curve of pure Zn plate includes the tensile stress-strain curve of pure Zn plate and the tensile stress-strain curve of pure Zn plate after being kept in an environment of 220℃ for 10 minutes; the yield strength (YS), ultimate tensile strength (UTS) and elongation of pure Zn plate are 53.7MPa, 78.6MPa and 109.0% respectively; and after being kept in an environment of 220℃ for 10 minutes, the ultimate tensile strength (UTS) and elongation are 138.7MPa and 13.6% respectively. It can be seen that compared with the unannealed one, although the strength has been improved, the plasticity has been reduced a lot, and there are obvious fluctuations in the tensile curve. This is because the material has delamination and fracture before yielding during the tensile process, indicating that pure zinc cannot continue to maintain its mechanical stability at high temperature and does not have thermal stability.

[0047] Figure 3 This is the metallographic microstructure diagram of the Zn-Ti layered composite material. The Zn-Ti layered composite material is mainly composed of silver-gray Zn and dark gray Ti. There is an obvious interface in the area near Ti, which is clearly visible in the metallographic microstructure diagram. Ti is evenly distributed in a relatively fine and diffuse manner, and some grains can also be seen.

[0048] Figure 4 This is the XRD spectrum of the Zn-Ti layered composite material. After 4 times of cumulative rolling, TiZn 16 phase, in the subsequent cumulative rolling process, there is TiZn 16 Phase generation.

[0049] Example 2 (10 μm Ti foil)

[0050] Take two pure Zn plates with a purity of 99.9% and specifications of 50mm long, 25mm wide and 1.5mm thick. First, polish the surface of the Zn plate with a round stainless steel brush with a diameter of 0.15mm to remove the surface oxide. Then drill holes in the four corners of the Zn plate so that it can be fixed with copper wire later. Then put the Zn plate in acetone for ultrasonic cleaning for 10 minutes to remove surface grease and impurities, and then blow dry with cold air from a hair dryer. Then take out the pure Ti foil with a purity of 99.9% and specifications of 50mm long, 25mm wide and 10μm thick from the glove box, put it between the two Zn plates, and then use copper wire to twist and fix it to avoid sliding of the Zn plate and Ti foil during rolling, so as to form a three-layer structure and obtain a composite plate. Then use a two-roll mill for the first cold rolling, and control the deformation of the first cold rolling to 65%. After the first rolling is completed, the cold-rolled sheet is cut into two pieces from the middle, stacked, and then cold-rolled again. The cutting-stacking-cold rolling is repeated 19 times, and the deformation amount is controlled to be 50% each time. A total of 20 rollings are performed to roll a composite sheet with a thickness of 1 mm. The present invention does not require any annealing treatment during the rolling process. The final Zn-Ti layered composite material is prepared by repeated cold rolling.

[0051] The Zn-Ti layered composite material is placed in an environment of 220°C and kept warm for 10 minutes for annealing to obtain an annealed Zn-Ti layered composite material.

[0052] In the Zn-Ti layered composite material provided in this embodiment, the volume fraction of Ti is about 0.33%, and the mass fraction is about 0.21%.

[0053] Performance Testing

[0054] The performance test includes the mechanical property test of the prepared Zn-Ti layered composite material and the mechanical property test data after the Zn-Ti layered composite material is placed in an environment of 220° C. and kept warm for 10 minutes.

[0055] Specific data

[0056] After 20 times of cumulative rolling, the Zn-Ti layered composite material sample is mainly composed of silver-gray Zn and dark gray Ti. There is an obvious interface in the area near Ti, which is clearly visible in the metallographic microstructure diagram. Ti is evenly distributed in a large and dispersed manner, and some grains can be seen. The tensile mechanical properties of the Zn-Ti layered composite material after cumulative rolling have been improved to a certain extent, and its tensile yield strength (YS), ultimate tensile strength (UTS), and elongation at break are 157.9MPa, 199.2MPa, and 18.3%, respectively. After the Zn-Ti layered composite material is kept in an environment of 220℃ for 10 minutes, its tensile yield strength (YS), ultimate tensile strength (UTS), and elongation at break are 237.5MPa, 262.4MPa, and 12.2%, respectively. However, compared with the addition of 5μmTi foil, its mechanical properties (including strength and plasticity) are poor.

[0057] Comparative Example 1 (Ti powder)

[0058] Take two pure Zn plates with a purity of 99.9% and specifications of 50mm long, 25mm wide and 1.5mm thick. First, polish the surface of the Zn plate with a round stainless steel brush with a diameter of 0.15mm to remove the surface oxide. Then drill holes in the four corners of the Zn plate so that it can be fixed with copper wire later. Then put the Zn plate in acetone for ultrasonic cleaning for 10 minutes to remove surface grease and impurities, and then blow dry with cold air from a hair dryer. Then put pure Ti powder with a purity of 99.9% and a size of 1μm in acetone for ultrasonic vibration for 10 minutes to disperse the Ti powder evenly, and then use a brush to evenly apply the suspension of Ti powder and acetone on one side of a polished zinc plate. After the acetone evaporates, put the two zinc plates on a balance and weigh them to determine the amount of Ti powder added. The mass fraction of Ti powder is about 0.1%. The zinc plate without Ti powder coating is covered on the zinc plate coated with Ti powder, and then copper wire is passed through to twist and fix, so as to prevent the Zn plate and Ti powder from sliding during rolling, thus forming a three-layer structure and obtaining a composite plate. Then the first cold rolling is carried out with a two-roll mill, and the deformation of the first cold rolling is controlled to be 65%, and the deformation of each subsequent cold rolling is 50%. However, since the two zinc plates were not combined during the first rolling, the subsequent forced cumulative rolling 2-3 times could not make the zinc plates combine, and the next experiment could not be carried out.

[0059] Comparative Example 2 (Ti Plate)

[0060] Take two pure Zn plates with a purity of 99.9%, specifications of 50mm long, 25mm wide and 1.5mm thick, and a pure Ti plate with a purity of 99.9%, specifications of 50mm long, 25mm wide and 0.15mm thick. First, use a round stainless steel brush with a diameter of 0.15mm to polish the surface of the Zn plate and the Ti plate to remove the surface oxide. Then drill holes in the four corners of the Zn plate and the Ti plate so that they can be fixed with copper wire later. Then put the Zn plate and the Ti plate into acetone for ultrasonic cleaning for 10 minutes to remove surface grease and impurities, and then blow dry with cold air from a hair dryer. Then use copper wire to pass through and twist and fix to avoid sliding of the Zn plate and the Ti plate during rolling, so as to form a three-layer structure and obtain a composite plate. Then use a two-roll mill for the first cold rolling, control the deformation of the first cold rolling to 65%, and the deformation of each subsequent cold rolling to 50%. After the first rolling, the cold-rolled sheet was cut into two pieces from the middle, stacked, and then cold-rolled again, and the cutting-stacking-cold-rolling process was repeated. In the Zn-Ti layered composite material provided in this embodiment, the volume fraction of Ti is about 4.76%, and the mass fraction is about 3.06%. During this experiment, the Zn-Ti layered composite material was stacked and rolled for the seventh time, and a large crack that ran through the entire cold-rolled sheet appeared on the cold-rolled sheet, and the next experiment could not be carried out.

[0061] Comparative Example 3 (15 μm Ti foil)

[0062] Take two pure Zn plates with a purity of 99.9% and specifications of 50mm long, 25mm wide and 1.5mm thick. First, polish the surface of the Zn plate with a round stainless steel brush with a diameter of 0.15mm to remove the surface oxide. Then drill holes in the four corners of the Zn plate so that it can be fixed with copper wire later. Then put the Zn plate in acetone for ultrasonic cleaning for 10 minutes to remove surface grease and impurities, and then blow dry with cold air from a hair dryer. Then take out the pure Ti foil with a purity of 99.9% and specifications of 50mm long, 25mm wide and 15μm thick from the glove box, put it between the two Zn plates, and then use copper wire to twist and fix it to avoid sliding of the Zn plate and Ti foil during rolling, so as to form a three-layer structure and obtain a composite plate. Then use a two-roll mill for the first cold rolling, control the deformation of the first cold rolling to 65%, and the deformation of each subsequent cold rolling to 50%. After the first rolling is completed, the cold-rolled plate is cut into two pieces from the middle, stacked, and then cold-rolled. The cutting-stacking-cold rolling is repeated 19 times, and a total of 20 times are rolled to obtain a composite plate with a thickness of 1 mm. The present invention does not require any annealing treatment during the rolling process. Repeated cold rolling completes the preparation of the final Zn-Ti layered composite material; in the Zn-Ti layered composite material provided in this embodiment, the volume fraction of Ti is about 0.50%, and the mass fraction is about 0.31%.

[0063] Implementation Effect

[0064] After 20 times of cumulative rolling, the Zn-Ti layered composite material sample is mainly composed of silver-gray Zn and dark gray Ti. There is an obvious interface in the area near Ti, which is clearly visible in the metallographic microstructure diagram. Ti is evenly distributed in a larger and dispersed manner, and some grains can be seen. The tensile mechanical properties of the Zn-Ti layered composite material after cumulative rolling are improved to a certain extent, and its tensile yield strength (YS), ultimate tensile strength (UTS), and elongation at break are 88.2MPa, 122.9MPa, and 71.3%, respectively. After the Zn-Ti layered composite material is kept in an environment of 220℃ for 10 minutes, its tensile yield strength (YS), ultimate tensile strength (UTS), and elongation at break are 116.3MPa, 149.7MPa, and 53.1%, respectively. However, compared with the addition of 5μmTi foil and 10μmTi foil, its mechanical properties are poor.

Claims

1. A method for preparing a degradable high-strength Zn-Ti layered composite material, characterized in that: Take two Zn plates and a Ti foil, put a piece of Ti foil between the two Zn plates to obtain a composite plate, perform the first cold rolling on the composite plate to obtain a cold-rolled plate, cut the cold-rolled plate into two pieces from the middle, stack them, and then cold-roll them again, repeat the cutting-stacking-cold rolling process to obtain a Zn-Ti layered composite material.

2. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1, characterized in that: The purity of the Zn plate is ≥99.9%; The purity of the Ti foil is ≥99.9%; The thickness of the Ti foil is 5-10 μm.

3. A method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: The Zn plate is first polished with a stainless steel wire brush having a wire diameter of 0.15-0.3 mm; The Ti foil is first placed in a vacuum environment and stored for later use.

4. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: Drill holes at the four corners of the two Zn plates, put a piece of Ti foil between the two Zn plates, and then twist and fix them with copper wire to obtain a composite plate.

5. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: When the composite plate is subjected to the first cold rolling, the deformation is controlled to be 65%-70%.

6. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: The cold-rolled sheet is cut into two halves from the middle, stacked, and then cold-rolled. In the process of repeated cutting-stacking-cold rolling, the deformation amount of any cold rolling is 50-55%.

7. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: The number of repeated cutting-lamination-cold rolling is 18-20 times.

8. The method for preparing a degradable high-strength Zn-Ti layered composite material according to claim 1 or 2, characterized in that: The material obtained after repeated cutting-lamination-cold rolling is subjected to annealing treatment, wherein the annealing temperature is 210° C.-230° C. and the insulation time is 10-15 minutes.

9. A degradable high-strength Zn-Ti layered composite material prepared by the preparation method according to any one of claims 1 to 8.

10. Application of a degradable high-strength Zn-Ti layered composite material prepared by the preparation method according to any one of claims 1 to 8, characterized in that: The Zn-Ti layered composite material is used for degradable biomedical metal materials.

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