CN117899275A - High-torsional-strength traumatic bone plate and preparation method thereof - Google Patents
High-torsional-strength traumatic bone plate and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-torsional-strength wound bone plate and a preparation method thereof, and relates to the field of medical metal materials and medical instruments thereof, wherein the wound bone plate is prepared from medical titanium alloy, and the chemical components of the wound bone plate are as follows in percentage by weight: al:5.3 to 7.0 percent, V:3.7 to 4.7 percent of Cu:4.1 to 6.2 percent of Ti and the balance. The titanium alloy is processed into the wound bone plate by adopting a special process, so that the torsional strength of the wound bone plate can be further improved under the condition that the wound bone plate has excellent tissue compatibility and strong plasticity, and the problem of fracture in the use process is prevented; meanwhile, the wound bone plate can inhibit methicillin-resistant staphylococcus aureus from forming a bacterial biofilm on the surface of the wound bone plate.
Description
Technical Field
The invention relates to the technical field of medical metal materials and medical instruments thereof, in particular to a high-torsional-strength wound bone plate capable of inhibiting drug-resistant bacterial biomembrane and a preparation method thereof.
Background
In fracture treatment, internal fixation therapy is one of the more common treatments. The treatment adopts a combination of a closed reduction technology and a minimally invasive technology, and the traumatic bone plate is used independently or matched with other orthopedic medical instruments (such as intramedullary nails, traumatic bone plates, artificial joints and the like); in the treatment, a bone plate is generally used for being matched with a screw to be implanted into a fracture part, so that the reduction and fixation of the fracture part are completed.
At present, a traumatic bone plate is mostly prepared from titanium or titanium alloy, wherein the titanium alloy is a metal with excellent biological safety, has higher specific strength, and is widely applied to the field of bone wound repair, such as bone pins, intramedullary nails, bone plates, screws, artificial joints and the like. In the fracture recovery process, because the stability of the fracture end is poor, obvious shearing force can be generated on the traumatic bone plate; for patients with a large BMI index or patients with slow bone healing, the phenomenon of fracture of a traumatic bone plate can occur; if a bacterial biomembrane formed by methicillin-resistant staphylococcus aureus is formed on the surface of an implant in a patient, the sustained infection is very easy to cause, and due to the methicillin-resistant characteristic of the strain, the existing medicines such as antibiotics and the like are difficult to interfere or treat the infection, and the deterioration of the infection finally causes loosening and even falling of a traumatic bone plate.
Therefore, there is a need to develop a titanium alloy wound bone plate with high torsional strength that can inhibit the formation of bacterial biofilms by methicillin-resistant staphylococcus aureus.
Disclosure of Invention
The invention aims to provide a wound bone plate with high torsional strength and capable of inhibiting methicillin-resistant staphylococcus aureus from forming a bacterial biofilm and a preparation method thereof, and the wound bone plate can further inhibit the attachment and proliferation of the methicillin-resistant staphylococcus aureus on the surface of the wound bone plate under the condition of ensuring that the wound bone plate has excellent tissue compatibility and strong plasticity so as to inhibit the formation of the methicillin-resistant staphylococcus aureus bacterial biofilm.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
in a first aspect, the present invention provides a high torsional strength traumatized bone plate prepared by a method comprising the steps of:
1) Smelting: the raw materials of sponge titanium, tiCu intermediate alloy, alV intermediate alloy, aluminum beans and aluminum mesh are proportioned according to the following components in percentage by weight: al:5.3 to 7.0 percent, V:3.7 to 4.7 percent of Cu:4.1 to 6.2 percent of Ti and the balance;
Making an aluminum net into a container, filling the container with titanium sponge, tiCu intermediate alloy, alV intermediate alloy and aluminum beans, pressing the container into a smelting electrode by using an electrode die, and smelting the smelting electrode into alloy cast ingots;
2) Preparing a titanium alloy slab: heating the alloy cast ingot to 740-800 ℃, preserving heat for 3-6 hours, performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank with the thickness of 80-100 mm, cutting the plate blank into small blocks, then heating to 730-810 ℃ again, preserving heat for 0.5-1 hour, cooling with water, then heating to 740-840 ℃ again, cooling with water, and circularly heating and cooling for 5 times;
3) Rough rolling of a plate blank: heating the alloy plate blank to 700-820 ℃, preserving heat for 0.6-2.3 hours, and then carrying out hot rolling, and adopting a hot rolling process to roll the plate blank into a plate with the thickness of 15-20 mm;
4) Finish rolling: the annealing and leveling temperature of the rough rolled plate is 740-810 ℃, the heat preservation is carried out for 1-8 hours, the plate is discharged from the furnace to be sprayed and cooled, and the cooling water temperature is 10-20 ℃; performing finish rolling on the annealed plate, wherein the pressing amount of each pass is 0.05-0.5 mm;
5) Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 640-700 ℃, and air-cooling; the obtained plate is polished by grinding, and the traumatic bone plate is obtained.
The following details the steps:
Step 1)
The alloy cast ingot comprises the following chemical components in percentage by weight: al:5.3 to 7.0 percent (such as 5.5 percent, 5.6 percent, 5.7 percent, 5.8 percent, 5.9 percent, 6.0 percent, 6.1 percent, 6.2 percent, 6.3 percent, 6.4 percent, 6.5 percent, 6.6 percent, 6.7 percent, 6.8 percent and 6.9 percent); v:3.7 to 4.7% (e.g., 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%), preferably 4.0 to 4.4%; cu:4.1 to 6.2% (e.g., 4.3%, 4.5%, 4.6%, 4.8%, 5.0%, 5.2%, 5.4%, 5.5%, 5.6%, 5.8%, 5.9%), preferably 4.8 to 5.8%, more preferably 5.2 to 5.6%; the balance of Ti;
the alloy cast ingot is formed by jointly pressing a raw material of sponge titanium, tiCu intermediate alloy, alV intermediate alloy, aluminum beans and a high-purity aluminum net serving as a container into an electrode and then smelting.
Preferably, the titanium sponge is grade 0 titanium sponge; the aluminum beans are high-purity aluminum beans with the purity of 99.99 percent.
Preferably, the aluminum net is rolled into two cylindrical aluminum net barrels with unequal bottom diameters, the two aluminum net barrels are sleeved together, a TiCu intermediate alloy is filled in a space between the two aluminum net barrels, and a mixture of aluminum beans, titanium sponge and AlV intermediate alloy is filled in the aluminum net barrels.
Then, embedding an aluminum net barrel into an electrode mould by using a mixture of aluminum beans, titanium sponge and AlV intermediate alloy, pressing into a smelting electrode, and smelting into an alloy cast ingot with the components.
Preferably, the smelting is vacuum consumable furnace smelting.
Step 2)
Preparing a titanium alloy slab: heating the alloy ingot to 740-800 ℃ (such as 750, 780 and 800 ℃), preserving heat for 3-6 hours, forging the alloy ingot to have a total forging ratio of 5-7, forging the alloy ingot into a slab with the thickness of 80-100 mm, cutting the slab into small blocks, heating the slab again to 730-810 ℃ (such as 730, 750, 780 and 810 ℃), preserving heat for 0.5-1 hour, cooling with water, and then heating the slab again to 740-840 ℃ with water.
Step 3)
Rough rolling of a plate blank:
Heating the alloy plate blank to 700-820 ℃, preserving heat for 1.5-6 hours, and then carrying out hot rolling, wherein the plate blank is rolled into a plate with the thickness of 15-20 mm by adopting a hot rolling process, the rough rolling is carried out for 10 times in total, the deformation of the 1 st time is 30-40%, the deformation of each time of the 2 nd-6 th times is 15-25%, and the deformation of each time of the 7 th-10 th times is 10-15%;
Step 4)
Finish rolling: the annealing and leveling temperature of the rough rolled plate is 740-810 ℃ (such as 740, 750, 780 and 810 ℃), the temperature is kept for 1-8 hours, the plate is discharged from the furnace to be sprayed and cooled, and the cooling water temperature is 10-20 ℃; performing finish rolling on the annealed plate, wherein the pressing amount of each pass is 0.05-0.5 mm;
Step 5)
Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 640-700 ℃ (such as 640, 650, 680 and 700 ℃), and air-cooling; the obtained plate is polished, and the torsional strength of the prepared traumatic bone plate is 0.95-1.1N.m.
The size of the wound bone plate is 150-250 mm long and 10-20 mm wide, the torsion strength is 0.95-1.1 N.m, the elongation is more than or equal to 14%, the cytotoxicity grade is less than or equal to 1 grade, and the pitting potential is more than or equal to 2040mV. Based on the co-culture results of TC4 titanium alloy contaminated with methicillin-resistant staphylococcus aureus bacteria as a comparison benchmark, the wound bone plate can provide a relative antimicrobial rate of greater than 99% in a co-culture model of an implant contaminated with methicillin-resistant staphylococcus aureus bacteria.
According to a second aspect of the present invention, there is provided a method of preparing a high torsional strength traumatized bone plate comprising the steps of:
1) Smelting: the raw materials of sponge titanium, tiCu intermediate alloy, alV intermediate alloy, aluminum beans and aluminum mesh are proportioned according to the following components in percentage by weight: al:5.3 to 7.0 percent, V:3.7 to 4.7 percent of Cu:4.1 to 6.2 percent of Ti and the balance;
Making an aluminum net into a container, filling the container with titanium sponge, tiCu intermediate alloy, alV intermediate alloy and aluminum beans, pressing the container into a smelting electrode by using an electrode die, and smelting the smelting electrode into alloy cast ingots;
2) Preparing a titanium alloy slab: heating the alloy cast ingot to 740-800 ℃, preserving heat for 3-6 hours, performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank with the thickness of 80-100 mm, cutting the plate blank into small blocks, then heating to 730-810 ℃ again, preserving heat for 0.5-1 hour, cooling with water, then heating to 740-840 ℃ again, cooling with water, and circularly heating and cooling for 5 times;
3) Rough rolling of a plate blank: heating the alloy plate blank to 700-820 ℃, preserving heat for 1.5-6 hours, and then carrying out hot rolling, wherein the plate blank is rolled into a plate with the thickness of 15-20 mm by adopting a hot rolling process, the rough rolling is carried out for 10 times in total, the deformation of the 1 st time is 30-40%, the deformation of each time of the 2 nd-6 th times is 15-25%, and the deformation of each time of the 7 th-10 th times is 10-15%;
4) Finish rolling: the annealing and leveling temperature of the rough rolled plate is 740-810 ℃, the heat preservation is carried out for 1-8 hours, the plate is discharged from the furnace to be sprayed and cooled, and the cooling water temperature is 10-20 ℃; performing finish rolling on the annealed plate, wherein the pressing amount of each pass is 0.05-0.5 mm;
5) Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 640-700 ℃, and air-cooling; the obtained plate is polished, and the torsional strength of the prepared traumatic bone plate is 0.95-1.1N.m.
The content of the second aspect corresponds to the corresponding content of the first aspect, and is not described here again.
The beneficial effects are that:
(1) Aiming at the application requirement of the traumatic bone plate and the design of alloy components, the invention adopts a special processing technology to obtain the traumatic bone plate with high torsional strength, has simple required equipment and processing technology and can meet the requirement of mass production.
(2) The wire material for the traumatic bone plate produced by the invention can obtain higher torsional strength (0.95-1.1 N.m), and can ensure excellent strong plasticity.
Drawings
FIG. 1 is a schematic cross-sectional view of a pressed double layer high purity aluminum mesh electrode.
Reference numerals: 1-a high-purity aluminum net barrel.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further illustrated by the following examples. The materials in the examples were prepared according to the existing methods or were directly commercially available unless otherwise specified.
Raw materials:
grade 0 titanium sponge (99.8%) available from jindati industries, inc.
TiCu master alloy (composition wt% 50% Ti, 50% Cu), alV master alloy (composition wt% 40% Al, 60% V) purchased from Beijing Xinrong Source Metal materials Co.
High purity aluminum beans (99.9%) were purchased from eastern high new metals materials limited.
High purity aluminum mesh (99.9%) from eastern high new metals materials limited.
Examples 1 to 8, comparative examples 1 to 8
A high torsional strength trauma bone plate prepared by a method comprising the steps of:
1) Smelting: smelting by using a vacuum consumable furnace, wherein the raw materials are 0-level titanium sponge, tiCu intermediate alloy, alV intermediate alloy, high-purity aluminum beans and high-purity aluminum nets; mechanically and uniformly mixing the aluminum beans, the titanium sponge and the AlV intermediate alloy by using a mixer, rolling the aluminum net into a cylinder shape, sleeving two aluminum net barrels together, filling TiCu intermediate alloy between the aluminum net barrels, and filling a mixture of the aluminum beans, the titanium sponge and the AlV intermediate alloy in the aluminum net barrels. Finally, embedding the aluminum net barrel into an electrode mould by using a mixture of aluminum beans, titanium sponge and AlV intermediate alloy, pressing the aluminum net barrel into a smelting electrode, and smelting the pressed electrode into an alloy cast ingot as shown in figure 1.
2) Preparing a titanium alloy slab: heating the alloy cast ingot to 780 ℃, preserving heat for 5 hours, performing hot forging, forging the alloy cast ingot into a plate blank with the total forging ratio of 7 and the thickness of 80-100 mm, cutting the plate blank into small blocks, then heating the plate blank to 800 ℃, preserving heat for 0.5-1 hour, cooling the plate blank with water, then heating the plate blank to 740-840 ℃ again, cooling the plate blank with water, and circularly heating and cooling the plate blank for 5 times;
3) Rough rolling of a plate blank: heating the alloy plate blank to 800 ℃, preserving heat for 5 hours, and then carrying out hot rolling, wherein the plate blank is rolled into a plate with the thickness of 15-20 mm by adopting a hot rolling process, and rough rolling is carried out for 10 times;
4) Finish rolling: the annealing and leveling temperature of the rough rolled plate is 780 ℃, the heat preservation is carried out for 4 hours, the plate is discharged from a furnace to be sprayed with water for cooling, and the annealed plate is subjected to finish rolling;
5) Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 680 ℃, and air-cooling; the obtained plate is polished by grinding to prepare the traumatic bone plate.
The alloy compositions and preparation processes of each example and comparative example are shown in tables 1,2, and 3.
Table 1 titanium alloy compositions (wt.%) and preparation processes used in examples and comparative examples
Table 2 parameters of the rolling process
TABLE 3 finishing Process parameters
Test example 1 Performance test
The examples and comparative materials were tested using a CTS-TL type torsional strength tester. The loading speed is 10mm/min, three parallel samples are taken from each group, and the torsion strength is obtained through experiments.
The room temperature tensile mechanical properties of the example and comparative example materials were tested using an Instron model 8872 tensile tester at a tensile rate of 0.5mm/min. Before testing, a lathe is adopted to process the material into standard tensile samples with the thread diameter of 10mm, the gauge length diameter of 5mm and the gauge length of 30mm, three parallel samples are taken from each group of heat treatment samples, and the mechanical properties obtained through experiments comprise the tensile strength and the elongation percentage, and the specific results are shown in Table 4.
According to national standard GBT16886.5-2017 medical instrument biological evaluation, thiazole blue (MTT) colorimetric method is adopted to measure cell survival rate, and further biological safety of the titanium alloy of the examples and the comparative examples is evaluated. The results of each group were then rated according to a 5-level toxicity rating (0, 1 meeting the requirements of biomedical materials) and are shown in Table 4.
According to the change of pitting potential in electrochemical corrosion performance detection, the microbial corrosion resistance of the material can be reflected. The titanium alloys of examples and comparative examples were tested for corrosion resistance by obtaining anodic polarization curves using stainless steel pitting potential measurement method (national standard: GB/T17899-1999), and the results of the tests are shown in Table 4.
Table 4 properties of the examples and comparative materials
Test example 2 in vitro Co-culture test
The methicillin-resistant staphylococcus aureus strain is inoculated on the inclined plane of a nutrient agar culture medium (NA), is cultured for 24 hours at the temperature of (37+/-1), and is preserved at the temperature of 0-5 ℃ for no more than 1 month to be used as the inclined plane preserving strain.
The slant-preserving bacteria are transferred onto a plate nutrient agar medium, and cultured for 24 hours at the temperature of (37+/-1) DEG C, and transferred 1 time a day for no more than 2 weeks. Fresh bacterial cultures (24 h in-transit) should be used for the test after 2 consecutive transfers.
A small amount (1-2 loops) of fresh bacteria is taken from the culture medium by an inoculating loop, added into the culture solution, sequentially diluted by 10 times, counted by a cell counting plate, and the diluted solution with the bacterial solution concentration of 5.0X10 5cfu/ml～10.0×105 cfu/ml is selected as the bacterial solution for the test.
15 Pieces of the mixture were preparedIs spread with 5-6/>Pouring a proper amount of sterile purified water into the sterile filter paper to make the filter paper fully absorb water. The filter paper is preferably pressed with sterile forceps without precipitation of a large amount of water.
Taking 15 sheetsThe sterile filters of each dish were covered with sterile filter paper and spread flat. 0.2ml of test bacterial liquid is dripped on/>Is applied to the sterile filter membrane.
Clamping a negative control TC4 alloy sample (A), a blank control medical high-density polyethylene sample (B) and a sample supply (C) by using a sterilizing forceps, wherein each sample is in parallel with 5 samples and is covered on The bacterial liquid is contacted with the sample uniformly on the sterile filter membrane, and the sample is cultured for 24 hours under the condition of (37+/-1) DEG C.
Taking out the samples cultured for 24 hours, adding 20ml of eluent, repeatedly washing the sample A, the sample B, the sample C and the cover film (preferably, washing the film by clamping with forceps), and shaking thoroughly. 1ml of eluent stock solution is sucked by a sterilizing gun head and transferred into a sterile culture dish, nutrient agar culture medium cooled to 46 ℃ is timely injected into the culture dish for about 15ml, and the culture dish is rotated to be uniformly mixed. The plating operation was repeated 2 times to obtain 2 elution-crude culture dishes. And (3) slowly injecting 1ml of eluent stock solution into a test tube containing 9ml of sterilized normal saline along the tube wall (note that the tip of the gun head does not touch the diluent in the tube), shaking the test tube, and uniformly mixing to prepare the eluent with the ratio of 1:10. 1ml of the eluting diluent 1:10 is transferred into a sterile culture dish, and the nutrient agar medium cooled to 46 ℃ is injected into about 15ml of the culture dish in time, and the culture dish is rotated to be uniformly mixed. The plating operation was repeated 2 times to obtain 2 plates of 1:10 elution diluent. Taking 1ml of 1:10 eluting diluent, slowly injecting into a test tube containing 9ml of sterilized normal saline along the tube wall (note that the tip of the gun head does not touch the diluent in the tube), shaking the test tube, and mixing uniformly to obtain 1:100 eluting diluent. 1ml of the eluting diluent 1:100 is transferred into a sterile culture dish, nutrient agar medium cooled to 46 ℃ is timely injected into the culture dish for about 15ml, and the culture dish is rotated to be uniformly mixed. The plating operation was repeated 2 times to obtain 1:100 elution diluent dishes 2. Taking 1:100 elution diluent 1ml is slowly injected into a test tube containing 9ml of sterilized normal saline along the tube wall (note that the tip of the gun head does not touch the diluent in the tube), the test tube is shaken, and the mixture is uniformly mixed to prepare 1:1000 elution diluent. Taking 1: 1ml of 1000 elution diluent is transferred into a sterile culture dish, nutrient agar medium cooled to 46 ℃ is timely injected into the culture dish for about 15ml, and the culture dish is rotated to be uniformly mixed. The plating operation was repeated 2 times to obtain 1:1000 elution diluent dishes 2.
When plate colony counting is carried out, naked eyes can be used for observing, and magnifying glass is used for checking if necessary, so that omission is avoided. After counting the colonies of each plate, the average colony count of each plate at the same dilution was determined. Plates with colony numbers between 30 and 300 were selected as a colony count measurement standard. Two plates should be used for one dilution, an average number of two plates should be used, when one plate has larger plate-shaped colony growth, the plate without plate-shaped colony growth should not be used as the colony number of the dilution, if the plate-shaped colony is less than half of the plate, and the colony distribution in the other half is very uniform, the number of the whole dish colonies can be calculated by multiplying 2 after the half plate. If there is chain colony growth in the plate (there is no obvious limit between colonies), if there is only one chain, it can be regarded as one colony; if there are several strands of different origin, each strand should be considered as a colony meter. Dilutions should be selected with average colony counts between 30 and 300, multiplied by dilution fold to fill out the report. If there are two dilutions, the number of colonies grown is between 30 and 300, depending on the ratio of the two. If the ratio is less than or equal to 2, reporting the average; if greater than 2, the smaller number is reported. If the average colony count for all dilutions is greater than 300, the dilution should be reported as the average colony count for the highest dilution multiplied by the dilution. If the average colony count for all dilutions is less than 30, the average colony count at the lowest dilution should be reported as multiplied by the dilution. If all dilutions were sterile, they were reported as less than 1 times the lowest dilution (see example 6 in table 5). If the average colony count for all dilutions is not between 30 and 300, with a fraction greater than 300 or less than 30, the average colony count closest to 30 or 300 is multiplied by the dilution fold report (see example 7 in Table 5).
Colony numbers are reported as actual numbers within 100, and at values greater than 100, two significant digits are employed, followed by a number after the two significant digits, calculated by rounding. To shorten the number zero after the number, it can also be expressed by an index of 10 (see table 5).
TABLE 5 dilution selection and colony count reporting method
Multiplying the measured viable count result by 100 to obtain actual viable count values of the recovered viable count after culturing the sample A, the sample B and the sample C for 24 hours, wherein the actual viable count values are A, B, C respectively, so that the test result is ensured to meet the following requirements, and otherwise, the test is invalid:
the 5 parallel viable bacteria values of the same blank control sample B are in line with (the highest logarithmic value-the lowest logarithmic value)/the average viable bacteria value logarithmic value is not more than 0.3;
The actual recovery live bacteria value A of the sample A should be no less than 1.0X10 5 cfu/tablet, and the actual recovery live bacteria value B of the sample B should be no less than 1.0X10 4 cfu/tablet.
The antibacterial ratio is calculated according to formula (A.1).
R(％)＝(B-C)/B×100 (A.1)
Wherein:
R-antibacterial rate,%;
B, average recovery bacteria number of a blank control sample, cfu/tablet;
c, average recovery bacteria number of antibacterial samples, cfu/tablet.
The results are shown in Table 6.
Table 6 antibacterial rate data for examples and comparative examples
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. A high torsional strength trauma bone plate prepared by a method comprising the steps of:
1) Smelting: the raw materials of sponge titanium, tiCu intermediate alloy, alV intermediate alloy, aluminum beans and aluminum mesh are proportioned according to the following components in percentage by weight: al:5.3 to 7.0 percent, V:3.7 to 4.7 percent of Cu:4.1 to 6.2 percent of Ti and the balance;
Making an aluminum net into a container, filling the container with titanium sponge, tiCu intermediate alloy, alV intermediate alloy and aluminum beans, pressing the container into a smelting electrode by using an electrode die, and smelting the smelting electrode into alloy cast ingots;
2) Preparing a titanium alloy slab: heating the alloy cast ingot to 740-800 ℃, preserving heat for 3-6 hours, performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank with the thickness of 80-100 mm, cutting into small blocks, heating to 730-810 ℃ again, preserving heat for 0.5-1 hour, cooling with water, then heating to 740-840 ℃ again, and cooling with water;
3) Rough rolling of a plate blank: heating the alloy plate blank to 700-820 ℃, preserving heat for 1.5-6 hours, and then carrying out hot rolling, wherein the plate blank is rolled into a plate with the thickness of 15-20 mm by adopting a hot rolling process, the rough rolling is carried out for 10 times in total, the deformation of the 1 st time is 30-40%, the deformation of each time of the 2 nd-6 th times is 15-25%, and the deformation of each time of the 7 th-10 th times is 10-15%;
4) Finish rolling: the annealing and leveling temperature of the rough rolled plate is 740-810 ℃, the heat preservation is carried out for 1-8 hours, the plate is discharged from the furnace to be sprayed and cooled, and the cooling water temperature is 10-20 ℃; performing finish rolling on the annealed plate, wherein the pressing amount of each pass is 0.05-0.5 mm;
5) Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 640-700 ℃, and air-cooling; the obtained plate is polished by grinding, and the traumatic bone plate is obtained.
2. The traumatized bone plate of claim 1, wherein in step 1), the aluminum mesh is rolled into two cylindrical aluminum mesh barrels having unequal bottom diameters, the two aluminum mesh barrels are sleeved together, a space between the two aluminum mesh barrels is filled with a TiCu intermediate alloy, and the interior of the aluminum mesh barrels is filled with a mixture of aluminum beans, titanium sponge and an AlV intermediate alloy.
3. The traumatized bone plate of claim 1, wherein the alloy ingot has vanadium and copper content of: v:4.0 to 4.4wt.%, cu:5 to 5.6wt.%.
4. The traumatized bone plate of claim 1, wherein in step 4) the number of water cooled cooling water nozzles is 1 to 3 and the water flow rate is 1.3 to 2.1m/s.
5. The traumatized bone plate of any one of claims 1-4, wherein the traumatized bone plate has a torsional strength of 0.95-1.1N-m, an elongation of 14% or more, a cytotoxicity rating of 1% or less, and a pitting potential of 2040mV or more.
6. A method for preparing a high torsional strength trauma bone plate, comprising the steps of:
1) Smelting: the raw materials of sponge titanium, tiCu intermediate alloy, alV intermediate alloy, aluminum beans and aluminum mesh are proportioned according to the following components in percentage by weight: al:5.3 to 7.0 percent, V:3.7 to 4.7 percent of Cu:4.1 to 6.2 percent of Ti and the balance; making an aluminum net into a container, filling the container with titanium sponge, tiCu intermediate alloy, alV intermediate alloy and aluminum beans, pressing the container into a smelting electrode by using an electrode die, and smelting the smelting electrode into alloy cast ingots;
2) Preparing a titanium alloy slab: heating the alloy cast ingot to 740-800 ℃, preserving heat for 3-6 hours, performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank with the thickness of 80-100 mm, cutting into small blocks, heating to 730-810 ℃ again, preserving heat for 0.5-1 hour, cooling with water, then heating to 740-840 ℃ again, and cooling with water;
3) Rough rolling of a plate blank: heating the alloy plate blank to 700-820 ℃, preserving heat for 1.5-6 hours, and then carrying out hot rolling, wherein the plate blank is rolled into a plate with the thickness of 15-20 mm by adopting a hot rolling process, the rough rolling is carried out for 10 times in total, the deformation of the 1 st time is 30-40%, the deformation of each time of the 2 nd-6 th times is 15-25%, and the deformation of each time of the 7 th-10 th times is 10-15%;
4) Finish rolling: the annealing and leveling temperature of the rough rolled plate is 740-810 ℃, the heat preservation is carried out for 1-8 hours, the plate is discharged from the furnace to be sprayed and cooled, and the cooling water temperature is 10-20 ℃; performing finish rolling on the annealed plate, wherein the pressing amount of each pass is 0.05-0.5 mm;
5) Leveling: loading the finish rolled plate into a leveling die, preserving heat for 2.0-3.0 hours at 640-700 ℃, and air-cooling; the obtained plate is polished by grinding, and the traumatic bone plate is obtained.
7. The method according to claim 6, wherein in step 1), the aluminum net is rolled into two cylindrical aluminum net barrels with unequal bottom diameters, the two aluminum net barrels are sleeved together, the space between the two aluminum net barrels is filled with TiCu intermediate alloy, and the inside of the aluminum net barrel is filled with a mixture of aluminum beans, titanium sponge and AlV intermediate alloy.
8. The method of claim 6, wherein the alloy ingot comprises the following vanadium and copper elements: v:4.0 to 4.4wt.%, cu:5 to 5.6wt.%.
9. The method according to claim 6, wherein in the step 4), the number of the water-cooled cooling water nozzles is 1 to 3, and the water flow rate is 1.3 to 2.1m/s.
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