Titanium cable lock buckle with low friction coefficient and preparation method thereof

Abstract

The application provides a titanium cable locking buckle with low friction coefficient and a preparation method thereof, relates to the field of medical metal materials and medical devices, and the titanium cable locking buckle is prepared from a medical titanium alloy, and the chemical components of the titanium alloy are as follows in percentage by weight: Al: 5.6-6.3 %, V: 3.6-4.5 %, Cu: 4.6-5.9 %, and Ti: the balance. The titanium alloy is processed into the titanium cable locking buckle through a special process, so that the friction coefficient of the titanium cable locking buckle is further reduced under the condition that the titanium cable locking buckle has excellent tissue compatibility and high plasticity, and the problem of fracture in the use process is prevented; meanwhile, the titanium cable locking buckle can inhibit the formation of bacterial biofilm of methicillin-resistant Staphylococcus aureus on the surface of the titanium cable locking buckle.

Description

Technical Field

[0001] This invention relates to the field of medical metal materials and medical devices, and in particular to a titanium cable locking buckle with a low coefficient of friction that can inhibit the biofilm of drug-resistant bacteria and its preparation method. Background Technology

[0002] Titanium cables are cable-like structures composed of multiple strands of fine titanium wires. As a type of cable technology, they are commonly used for internal fixation in bone trauma. Currently, titanium cable locking buckles are mostly made of titanium or titanium alloys. Titanium alloys are a metal with excellent biocompatibility and high specific strength, and are widely used in the field of bone trauma repair, such as bone pins, intramedullary nails, bone plates, screws, and artificial joints. During fracture rehabilitation, due to the poor stability of the fracture ends, the frictional force of titanium cables on tissues significantly increases the irritation of the implant to soft tissues. In addition, if a biofilm of methicillin-resistant Staphylococcus aureus (MRSA) forms on the surface of the implant in the patient, it can easily cause persistent infection. Due to the methicillin-resistant nature of this bacteria, existing drugs such as antibiotics are difficult to intervene in or treat this type of infection. The deterioration of the infection eventually causes the titanium cable locking buckle to loosen or even fall off.

[0003] Therefore, there is an urgent need to develop a titanium alloy cable locking buckle with a low coefficient of friction that can inhibit the formation of bacterial biofilms by methicillin-resistant Staphylococcus aureus. Summary of the Invention

[0004] The purpose of this invention is to provide a titanium cable locking buckle with a low coefficient of friction and a method for its preparation. While ensuring that the titanium cable locking buckle has excellent biocompatibility and strong plasticity, it further inhibits the attachment and proliferation of methicillin-resistant Staphylococcus aureus on its surface, thereby inhibiting the formation of methicillin-resistant Staphylococcus aureus bacterial biofilm.

[0005] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0006] In a first aspect, the present invention provides a low-friction coefficient titanium cable locking buckle, prepared by a method comprising the following steps:

[0007] 1) Smelting: The raw materials sponge titanium, TiCu master alloy, AlV master alloy, aluminum briquettes and aluminum mesh are weighed and proportioned as follows: Al: 5.6-6.3%, V: 3.6-4.5%, Cu: 4.6-5.9%, Ti balance;

[0008] Aluminum mesh is made into a container, filled with sponge titanium, TiCu master alloy, AlV master alloy and aluminum granules, pressed into a melting electrode using an electrode mold, and then melted into an alloy ingot.

[0009] 2) Preparation of titanium alloy slabs: Heat the alloy ingot to 710-820℃, hold for 4-6 hours for hot forging, with a total forging ratio of 4-6, forging into slabs with a thickness of 80-100mm. After dividing into small pieces, heat to 700-800℃ again, hold for 0.5-1 hour, and water cool. Then heat to 750-800℃ again and water cool. Repeat this heating and cooling cycle 5 times.

[0010] 3) Slab rough rolling: The alloy slab is heated to 730-810℃ and held for 1-2 hours before hot rolling. The slab is rolled into a plate with a thickness of 15-20mm using the hot rolling process. The rough rolling is carried out in 8 passes. The deformation amount in the first pass is 20-30%, the deformation amount in the second to sixth passes is 15-25% per pass, and the deformation amount in the seventh and eighth passes is 10-15% per pass.

[0011] 4) Finish rolling: The rough-rolled plate is annealed and leveled at a temperature of 730-820℃ and held for 2-8 hours. After exiting the furnace, it is sprayed with water for cooling, and the cooling water temperature is 10-20℃. The annealed plate is then finished rolled, with a reduction of 0.05-0.5mm per pass.

[0012] 5) Leveling treatment: After precision rolling, the plate is put into the leveling mold and kept at 610-710℃ for 1.6-3.2 hours, and then air-cooled; the resulting plate is ground and polished to obtain titanium cable locking buckles.

[0013] The following is a detailed explanation of each step:

[0014] Step 1)

[0015] The chemical composition of the alloy ingot, by weight percentage, is as follows: Al: 5.6–6.3% (e.g., 5.6%, 5.7%, 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%); V: 3.6–4.5% (e.g., 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%), preferably 3.9–4.2%; Cu: 4.6–5.9% (e.g., 4.8%, 5.0%, 5.2%, 5.4%, 5.5%, 5.6%, 5.8%, 5.9%), preferably 4.8–5.8%, more preferably 5.2–5.6%; Ti balance;

[0016] The alloy ingot is made by pressing raw materials such as sponge titanium, TiCu master alloy, AlV master alloy, aluminum briquettes, and high-purity aluminum mesh as a container into electrodes and then melting them.

[0017] Preferably, the sponge titanium is grade 0 sponge titanium; the aluminum briquettes are high-purity aluminum briquettes with a purity of 99.99%.

[0018] Preferably, the aluminum mesh is rolled into two cylindrical aluminum mesh barrels with different bottom diameters, the two aluminum mesh barrels are nested together, the space between the two aluminum mesh barrels is filled with TiCu master alloy, and the interior of the aluminum mesh barrels is filled with a mixture of aluminum granules, sponge titanium and AlV master alloy (the aluminum granules and sponge titanium are mechanically mixed using a mixer).

[0019] Then, an aluminum mesh barrel is embedded in an electrode mold using a mixture of aluminum briquettes, sponge titanium, and AlV master alloy, and pressed into a smelting electrode, which is then smelted into an alloy ingot with the above composition.

[0020] Preferably, the smelting is carried out in a vacuum arc furnace.

[0021] Step 2)

[0022] Preparation of titanium alloy slabs: Heat the alloy ingot to 710-820℃ (e.g., 720, 750, 780, 800℃), hold for 4-6 hours, forge the total forging ratio to 4-6, and forge into slabs with a thickness of 80-100mm. After dividing into small pieces, reheat to 700-800℃ (e.g., 730, 750, 780, 790℃), hold for 0.5-1 hour, and water cool. Then reheat to 750-800℃ and water cool. Repeat this heating and cooling cycle 5 times.

[0023] Step 3)

[0024] Slab rough rolling: The alloy slab is heated to 730-810℃ (e.g., 730, 750, 780, 800℃), held for 1-2 hours, and then hot-rolled into a plate with a thickness of 15-20mm. The rough rolling is carried out in 8 passes. The deformation amount in the first pass is 20-30%, the deformation amount in the second to sixth passes is 15-25% per pass, and the deformation amount in the seventh and eighth passes is 10-15% per pass.

[0025] Step 4)

[0026] Finish rolling: The rough-rolled plate is annealed and leveled at a temperature of 730-820℃ (e.g., 740, 750, 780, 800℃), held for 2-8 hours, and then sprayed with water for cooling at a temperature of 10-20℃. The annealed plate is then finished rolled with a reduction of 0.05-0.5mm per pass.

[0027] Step 5)

[0028] Leveling treatment: After precision rolling, the plate is placed into a leveling mold and kept at 610-710℃ (e.g., 640, 650, 680, 690℃) for 1.6-3.2 hours, and then air-cooled; the resulting plate is ground and polished, and the friction coefficient of the titanium cable locking buckle is 0.42-0.45.

[0029] The titanium cable locking buckle has a thickness of 4–6 mm, a coefficient of friction of 0.42–0.45, an elongation of ≥12%, a cytotoxicity rating of ≤1, and a pitting potential of ≥2013 mV. Using the co-culture results of TC4 titanium alloy contaminated with methicillin-resistant Staphylococcus aureus (MRSA) bacteria as a benchmark, the titanium cable locking buckle can provide a relative antibacterial rate of over 99% in a co-culture model of implants contaminated with MRSA bacteria.

[0030] According to a second aspect of the present invention, a method for preparing a titanium cable locking buckle with a low coefficient of friction is provided, comprising the following steps:

[0031] 1) Smelting: The raw materials sponge titanium, TiCu master alloy, AlV master alloy, aluminum briquettes and aluminum mesh are weighed and proportioned as follows: Al: 5.6-6.3%, V: 3.6-4.5%, Cu: 4.6-5.9%, Ti balance;

[0032] Aluminum mesh is made into a container, filled with sponge titanium, TiCu master alloy, AlV master alloy and aluminum granules, pressed into a melting electrode using an electrode mold, and then melted into an alloy ingot.

[0033] 2) Preparation of titanium alloy slabs: Heat the alloy ingot to 710-820℃, hold for 4-6 hours for hot forging, with a total forging ratio of 4-6, forging into slabs with a thickness of 80-100mm. After dividing into small pieces, heat to 700-800℃ again, hold for 0.5-1 hour, and water cool. Then heat to 750-800℃ again and water cool. Repeat this heating and cooling cycle 5 times.

[0034] 3) Slab rough rolling: The alloy slab is heated to 730-810℃ and held for 1-2 hours before hot rolling. The slab is rolled into a plate with a thickness of 15-20mm using the hot rolling process. The rough rolling is carried out in 8 passes. The deformation amount in the first pass is 20-30%, the deformation amount in the second to sixth passes is 15-25% per pass, and the deformation amount in the seventh and eighth passes is 10-15% per pass.

[0035] 4) Finish rolling: The rough-rolled plate is annealed and leveled at a temperature of 730-820℃ and held for 2-8 hours. After exiting the furnace, it is sprayed with water for cooling, and the cooling water temperature is 10-20℃. The annealed plate is then finished rolled, with a reduction of 0.05-0.5mm per pass.

[0036] 5) Leveling treatment: After precision rolling, the plate is put into the leveling mold and kept at 610-710℃ for 1.6-3.2 hours, and then air-cooled; the resulting plate is ground and polished, and the friction coefficient of the titanium cable locking buckle is 0.42-0.45.

[0037] The content of the second aspect is the same as the corresponding content in the first aspect, and will not be repeated here.

[0038] Beneficial effects:

[0039] (1) This invention addresses the application requirements of titanium cable locking buckles and the design of alloy composition. It employs a special processing technology to obtain titanium cable locking buckles with a low coefficient of friction. The required equipment and processing technology are simple and can meet the needs of mass production.

[0040] (2) The titanium cable locking wire produced by the present invention can obtain a high coefficient of friction (0.42-0.45) and can ensure excellent strength and plasticity. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the cross-section of the pressed double-layer high-purity aluminum mesh electrode.

[0042] Attached image label: 1 - High-purity aluminum mesh drum. Detailed Implementation

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The present invention will be further illustrated by the following examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0045] raw material:

[0046] Grade 0 sponge titanium (99.8%), purchased from Jinda Titanium Industry Co., Ltd.

[0047] TiCu master alloy (wt% composition: 50% Ti, 50% Cu) and AlV master alloy (wt% composition: 40% Al, 60% V) were purchased from Beijing Xingrongyuan Metal Materials Co., Ltd.

[0048] High-purity aluminum briquettes (99.9%) were purchased from Dongfang High-Tech Metal Materials Co., Ltd.

[0049] High-purity aluminum mesh (99.9%), purchased from Dongfang High-Tech Metal Materials Co., Ltd.

[0050] Examples 1-8, Comparative Examples 1-8

[0051] A low-friction coefficient titanium cable locking buckle is prepared by a method comprising the following steps:

[0052] 1) Melting: Melting is carried out using a vacuum arc remelting furnace. The raw materials are grade 0 sponge titanium, TiCu master alloy, AlV master alloy, high-purity aluminum briquettes, and high-purity aluminum mesh. A mixer is used to mechanically mix the aluminum briquettes, sponge titanium, and AlV master alloy. The aluminum mesh is rolled into a cylindrical shape, with two mesh cylinders nested together. The space between the mesh cylinders is filled with TiCu master alloy, and the interior of the mesh cylinders is filled with a mixture of aluminum briquettes, sponge titanium, and AlV master alloy. Finally, the aluminum mesh cylinders are embedded into an electrode mold using the mixture of aluminum briquettes, sponge titanium, and AlV master alloy, and pressed to form a molten electrode, such as... Figure 1 As shown, the pressed electrodes are melted into alloy ingots.

[0053] 2) Preparation of titanium alloy slabs: Heat the alloy ingot to 780℃, hold for 5 hours for hot forging, with a total forging ratio of 7, forging into slabs with a thickness of 80-100mm, dividing them into small pieces, reheating to 800℃, holding for 0.5-1 hour, water cooling, then reheating to 740-840℃, water cooling, and repeating this heating and cooling cycle 5 times;

[0054] 3) Slab rough rolling: The alloy slab is heated to 800℃ and held for 2 hours before hot rolling. The slab is rolled into a plate with a thickness of 15-20mm using the hot rolling process. The rough rolling is performed in 8 passes.

[0055] 4) Finish rolling: The rough-rolled plate is annealed and leveled at 780℃ and held for 4 hours. After being taken out of the furnace, it is sprayed with water for cooling. The annealed plate is then finished rolled.

[0056] 5) Leveling treatment: After precision rolling, the sheet is put into a leveling mold and kept at 680℃ for 2.0 to 3.0 hours, then air-cooled; the resulting sheet is ground and polished, and then longitudinally cut into titanium cable locking buckles.

[0057] The alloy composition and preparation process of each embodiment and comparative example are shown in Tables 1, 2, and 3.

[0058] Table 1. Titanium alloy composition (wt.%) and preparation process used in the examples and comparative examples.

[0059]

[0060] Table 2 Rolling process parameters

[0061]

[0062]

[0063] Table 3 Finishing rolling process parameters

[0064]

[0065] Test Example 1 Performance Test

[0066] The friction coefficients of the materials in the examples and comparative examples were tested using a ball-on-disk tribometer (MS-T300, China). The experimental mode was reciprocating linear sliding friction, with a sliding speed of 0.06 m / s, a load of 5 N, and 300 reciprocations. The grinding pair consisted of Si3N4 balls with a diameter of 4 mm.

[0067] The room temperature tensile mechanical properties of the materials in the examples and comparative examples were tested using an Instron 8872 tensile testing machine at a tensile rate of 0.5 mm / min. Before testing, the materials were machined into standard tensile specimens with a thread diameter of 10 mm, a gauge length of 5 mm, and a gauge length of 30 mm using a lathe. Three parallel specimens were taken from each group of heat-treated specimens. The mechanical properties obtained from the experiment included tensile strength and elongation. The specific results are shown in Table 4.

[0068] According to the national standard GB / T16886.5-2017 Biological Evaluation of Medical Devices, cell viability was determined using the MTT assay to evaluate the biosafety of the titanium alloys in the examples and comparative examples. Then, the results of each group were evaluated according to the five-level toxicity evaluation standard (levels 0 and 1 meet the requirements for biomedical materials). The results are shown in Table 4.

[0069] The change in pitting potential during electrochemical corrosion performance testing reflects the material's resistance to microbial corrosion. The corrosion resistance of the titanium alloys in the examples and comparative examples was tested using the stainless steel pitting potential measurement method (National Standard: GB / T 17899-1999) to obtain anodic polarization curves and determine their corrosion resistance. The test results are shown in Table 4.

[0070] Table 4 Performance of the materials in the examples and comparative examples

[0071]

[0072] Test Example 2: In Vitro Co-culture Experiment

[0073] Methicillin-resistant Staphylococcus aureus (MRSA) strains were inoculated onto nutrient agar (NA) slant culture medium, cultured at (37±1)℃ for 24 h, and then stored at 0℃~5℃ (not exceeding 1 month) as slant culture culture.

[0074] Transfer the slant culture to nutrient agar plates and incubate at (37±1)℃ for 24 hours. Substitute once a day for no more than 2 weeks. Fresh bacterial cultures (substituted within 24 hours) after two consecutive subcultures should be used in the experiment.

[0075] Take a small amount (1-2 loops) of fresh bacteria from the culture medium using an inoculation loop, add it to the culture medium, and perform 10-fold serial dilutions. Count the bacteria using a cell counting chamber, and select a bacterial concentration of 5.0 × 10⁻⁶. 5 cfu / ml ~10.0×10 5 A CFU / ml dilution was used as the bacterial culture for the test.

[0076] Prepare 15 For sterilized petri dishes, place 5-6 sheets of [unspecified material] on the bottom of the petri dish. Use sterile filter paper and pour in an appropriate amount of sterile purified water to fully absorb the water. The filter paper should be able to absorb the water when pressed with sterile tweezers without releasing a large amount of water.

[0077] Take 15 sheets A sterile filter membrane is placed over the sterile filter paper on each petri dish, spreading it out evenly. 0.2 ml of the test bacterial suspension is then dropped onto... On the sterile filter membrane.

[0078] Using sterile forceps, pick up the negative control TC4 alloy sample (A), the blank control medical high-density polyethylene sample (B), and the test sample (C). Perform five replicates for each sample, covering them with sterile forceps. Place the bacterial solution onto a sterile filter membrane to ensure uniform contact with the sample, and incubate at (37±1)℃ for 24h.

[0079] Take the samples cultured for 24 hours, add 20 ml of elution buffer to each sample, and repeatedly wash samples A, B, and C, as well as the covering film (preferably using tweezers to pick up the film and rinse), shaking thoroughly. Using a sterile pipette tip, transfer 1 ml of the stock eluent into a sterile petri dish. Immediately add approximately 15 ml of nutrient agar medium cooled to 46°C to the dish and rotate to mix thoroughly. Repeat the plating process twice to obtain two petri dishes containing the stock eluent. Take another 1 ml of the stock eluent and slowly pour it along the wall of a test tube containing 9 ml of sterile physiological saline (be careful not to let the pipette tip touch the diluent in the tube). Shake the test tube to mix thoroughly, preparing a 1:10 eluent dilution. Transfer 1 ml of the 1:10 eluent dilution into a sterile petri dish, immediately add approximately 15 ml of nutrient agar medium cooled to 46°C to the dish, and rotate to mix thoroughly. Repeat the plating process twice to obtain two petri dishes containing the 1:10 eluent dilution. Take 1 ml of 1:10 elution buffer and slowly pour it along the wall of a test tube containing 9 ml of sterile physiological saline (be careful not to let the tip of the pipette touch the diluent in the tube). Shake the test tube to mix thoroughly, making a 1:100 elution buffer. Transfer 1 ml of the 1:100 elution buffer to a sterile petri dish, and immediately pour about 15 ml of nutrient agar medium cooled to 46°C into the petri dish, rotating the petri dish to mix thoroughly. Repeat the plating process twice to obtain two petri dishes with the 1:100 elution buffer. Take 1 ml of the 1:100 elution buffer and slowly pour it along the wall of a test tube containing 9 ml of sterile physiological saline (be careful not to let the tip of the pipette touch the diluent in the tube). Shake the test tube to mix thoroughly, making a 1:1000 elution buffer. Transfer 1 ml of the 1:1000 elution dilution to a sterile petri dish. Immediately pour approximately 15 ml of nutrient agar medium, cooled to 46°C, into the dish and rotate to mix thoroughly. Repeat the plating process twice to obtain two petri dishes containing the 1:1000 elution dilution.

[0080] When performing plate colony counting, visual inspection can be used, and a magnifying glass can be used if necessary to prevent omissions. After recording the colony count on each plate, calculate the average total colony count for each plate at the same dilution. Select plates with colony counts between 30 and 300 as the standard for total colony count determination. If two plates are used for one dilution, the average of the two plates should be used. If one plate has large, sheet-like colonies, it should not be used; instead, the plate without sheet-like colonies should be used as the colony count for that dilution. If sheet-like colonies cover less than half of the plate, but the colonies in the remaining half are evenly distributed, the count for half the plate can be multiplied by 2 to represent the total colony count. If chain-like colonies grow on the plate (with no clear boundaries between colonies), if there is only one chain, it can be considered as one colony; if there are several chains from different sources, each chain should be counted as one colony. A dilution with an average colony count between 30 and 300 should be selected and multiplied by the dilution factor when filling out the report. If two dilutions both produce colony counts between 30 and 300, the decision depends on their ratio. If the ratio is less than or equal to 2, report the average; if greater than 2, report the smaller number. If the average colony count for all dilutions is greater than 300, report the highest average colony count multiplied by the dilution factor. If the average colony count for all dilutions is less than 30, report the lowest average colony count multiplied by the dilution factor. If no colonies grow at any dilution, report a value less than 1 multiplied by the lowest dilution factor (see Example 6 in Table 5). If the average colony count for all dilutions is not between 30 and 300, but some are greater than 300 or less than 30, report the average colony count closest to 30 or 300 multiplied by the dilution factor (see Example 7 in Table 5).

[0081] When the colony count is less than 100, report the actual number. When it is greater than 100, use two significant figures. The value after the two significant figures is rounded. To shorten the number of zeros, it can also be expressed as a power of 10 (see Table 5).

[0082] Table 5. Dilution Selection and Colony Count Reporting Method

[0083]

[0084] Multiply the measured viable count by 100 to obtain the actual recovered viable counts of samples A, B, and C after 24 hours of incubation. The values ​​are A, B, and C, respectively. Ensure the test results meet the following requirements; otherwise, the test is invalid:

[0085] For the same blank control sample B, the five parallel viable cell counts should meet the requirement that the logarithm of (highest logarithm - lowest logarithm) / average viable cell count is no greater than 0.3;

[0086] The actual recovered viable bacteria count (A) of sample A should not be less than 1.0 × 10⁻⁶.5 CFU / tablet, and the actual recovered viable bacteria count of sample B should not be less than 1.0 × 10⁻⁶. 4 cfu / film.

[0087] The antibacterial rate is calculated according to formula (A.1).

[0088] R(%)=(BC) / B×100 (A.1)

[0089] In the formula:

[0090] R – Antibacterial rate, %;

[0091] B—Average recovered bacterial count in blank control sample, CFU / tablet;

[0092] C – Average number of recovered bacteria in antibacterial samples, CFU / tablet.

[0093] The results are shown in Table 6.

[0094] Table 6 Antibacterial rate data for examples and comparative examples

[0095]

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-friction coefficient titanium cable locking buckle, characterized in that, Prepared by a method including the following steps: 1) Smelting: The raw materials sponge titanium, TiCu master alloy, AlV master alloy, aluminum briquettes and aluminum mesh are weighed and proportioned as follows: Al: 5.6~6.3%, V: 3.6~4.5%, Cu: 4.6~5.9%, Ti balance; The aluminum mesh is made into a container, filled with sponge titanium, TiCu master alloy, AlV master alloy and aluminum granules, pressed into a melting electrode using an electrode mold, and then melted into an alloy ingot. 2) Preparation of titanium alloy slabs: Heat the alloy ingot to 710~820℃, hold for 4~6 hours for hot forging, the total forging ratio is 4~6, forging into slabs with a thickness of 80~100mm, dividing them into small pieces, then heating to 700~800℃, holding for 0.5~1 hours, water cooling, then heating to 750~800℃ again, water cooling, and repeating this heating and cooling cycle 5 times; 3) Slab rough rolling: The alloy slab is heated to 730~810℃, held for 1~2 hours and then hot rolled. The slab is rolled into a plate with a thickness of 15~20mm using the hot rolling process. The rough rolling is carried out in 8 passes. The deformation of the first pass is 20~30%, the deformation of the second to sixth passes is 15~25% per pass, and the deformation of the seventh and eighth passes is 10~15% per pass. 4) Finish rolling: The rough-rolled plate is annealed and leveled at a temperature of 730~820℃, held for 2~8 hours, and then sprayed with water for cooling. The cooling water temperature is 10~20℃, and the number of cooling water nozzles is 1~3, with a water flow rate of 1.5~2.2m / s. The annealed plate is then finished rolled, with a reduction of 0.05~0.5mm per pass. 5) Leveling treatment: After precision rolling, the plate is placed into a leveling mold and kept at 610~710℃ for 1.6~3.2 hours, then air-cooled; the resulting plate is ground and polished to obtain titanium cable locking buckles. The friction coefficient of the titanium cable locking buckles is 0.42~0.45, the elongation is ≥12%, the cytotoxicity rating is ≤1, and the pitting potential is ≥2013mV.

2. The titanium cable locking buckle according to claim 1, characterized in that, In step 1), the aluminum mesh is rolled into two cylindrical aluminum mesh barrels with different bottom diameters. The two aluminum mesh barrels are nested together, and the space between the two aluminum mesh barrels is filled with TiCu master alloy. The inside of the aluminum mesh barrels is filled with a mixture of aluminum granules, sponge titanium and AlV master alloy.

3. The titanium cable locking buckle according to claim 1, characterized in that, The vanadium and copper content in the alloy ingot is: V: 3.9~4.2 wt.%, Cu: 5.2~5.6 wt.%.

4. A method for preparing a low-friction coefficient titanium cable locking buckle, characterized in that, Includes the following steps: 1) Smelting: The raw materials sponge titanium, TiCu master alloy, AlV master alloy, aluminum briquettes and aluminum mesh are weighed and proportioned as follows: Al: 5.6~6.3%, V: 3.6~4.5%, Cu: 4.6~5.9%, Ti balance; The aluminum mesh is made into a container, filled with sponge titanium, TiCu master alloy, AlV master alloy and aluminum granules, pressed into a melting electrode using an electrode mold, and then melted into an alloy ingot. 2) Preparation of titanium alloy slabs: Heat the alloy ingot to 710~820℃ and hold for 4~6 hours. The total forging ratio is 4~6. Forge into slabs with a thickness of 80~100mm. After dividing into small pieces, reheat to 700~800℃ and hold for 0.5~1 hours. Water cool. Then reheat to 750~800℃ and water cool. Repeat this heating and cooling cycle 5 times. 3) Slab rough rolling: The alloy slab is heated to 730~810℃ and held for 1~2 hours. The slab is then rolled into a plate with a thickness of 15~20mm using a hot rolling process. The rough rolling is performed in 8 passes. The deformation is 20~30% in the first pass, 15~25% in each of the second to sixth passes, and 10~15% in each of the seventh and eighth passes. 4) Finish rolling: The rough-rolled plate is annealed and leveled at a temperature of 730~820℃, held for 2~8 hours, and then sprayed with water for cooling. The cooling water temperature is 10~20℃, and the number of cooling water nozzles is 1~3, with a water flow rate of 1.5~2.2m / s. The annealed plate is then finished rolled, with a reduction of 0.05~0.5mm per pass. 5) Leveling treatment: After precision rolling, the plate is put into the leveling mold and kept at 610~710℃ for 1.6~3.2 hours, and then air-cooled; the resulting plate is ground and polished, and the friction coefficient of the titanium cable locking buckle is 0.42~0.45, the elongation is ≥12%, the cytotoxicity rating is ≤1, and the pitting potential is ≥2013mV.

5. The preparation method according to claim 4, characterized in that, In step 1), the aluminum mesh is rolled into two cylindrical aluminum mesh barrels with different bottom diameters. The two aluminum mesh barrels are nested together, and the space between the two aluminum mesh barrels is filled with TiCu master alloy. The inside of the aluminum mesh barrels is filled with a mixture of aluminum granules, sponge titanium and AlV master alloy.

6. The preparation method according to claim 4, characterized in that, The vanadium and copper content in the alloy ingot is: V: 3.9~4.2 wt.%, Cu: 5.2~5.6 wt.%.

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