CN117899274A - Interface screw with low friction coefficient and preparation method thereof - Google Patents
Interface screw with low friction coefficient and preparation method thereof Download PDFInfo
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Abstract
The invention provides an interface screw with a low friction coefficient and a preparation method thereof, and relates to the field of medical metal materials and medical instruments thereof, wherein the interface screw is prepared from medical titanium alloy, and the interface screw comprises the following chemical components in percentage by weight: al:5.2 to 6.7 percent, V:3.4 to 4.3 percent of Cu:4.3 to 6.2 percent of Ti and the balance. The titanium alloy is processed into the interface screw by adopting a special process, so that the friction coefficient of the interface screw is further reduced under the condition that the interface screw has excellent tissue compatibility and strong plasticity, and the problem of fracture in the use process is prevented; meanwhile, the interface screw can inhibit methicillin-resistant staphylococcus aureus from forming a bacterial biofilm on the surface of the methicillin-resistant staphylococcus aureus.
Description
Technical Field
The invention relates to the technical field of medical metal materials and medical instruments thereof, in particular to an interface screw with a low friction coefficient and a preparation method thereof.
Background
The interface screw is an implant that is used primarily to secure a tendon or ligament bone block to the femoral and tibial bone canal during cruciate ligament reconstruction. At present, the interface screw 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 interface screw; for patients with a larger BMI index or patients with slow bone healing, the phenomenon of fracture of the interface screw 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 interface screw is loosened or even falls off due to the deterioration of the infection.
Therefore, there is a need to develop a low friction coefficient titanium alloy interface screw that inhibits methicillin-resistant staphylococcus aureus from forming bacterial biofilms.
Disclosure of Invention
The invention aims to provide an interface screw with a low friction coefficient and a preparation method thereof, which can further inhibit adhesion and proliferation of methicillin-resistant staphylococcus aureus on the surface of the interface screw under the condition of ensuring that the interface screw has excellent tissue compatibility and strong plasticity so as to inhibit formation of 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 low coefficient of friction interface screw 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:5.2 to 6.7 percent, V:3.4 to 4.3 percent of Cu:4.3 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) Forging: heating the alloy ingot to 950-1150 ℃, preserving heat for 4-5 hours, and then performing hot forging, wherein the total forging ratio is 5-6, forging into a plate blank along the axial direction of the ingot, and cutting the plate blank into square bars along the length direction; the square rod is heated to 820-1030 ℃ again, kept for 0.5-1 hour and cooled by water;
3) And (3) hot rolling: heating the alloy square bar to 700-830 ℃, carrying out hot rolling after heat preservation for 1.2-2.2 hours, carrying out rolling for 9-10 times, and rolling into bars with the diameter of 10-13 mm, wherein the deformation of each time in the 1 st-5 th times is 10-15%, the interval time between two adjacent times in the 1 st-5 th times is 15-30 s, the deformation of each time in the 6 th and subsequent times is not higher than 23%, and the interval time between two adjacent times in the 6 th and subsequent times is 25-45 s;
4) Oxidation annealing treatment: oxidizing and annealing the bar at 560-730 deg.c for 0.8-1.8 hr and air cooling;
5) And (3) hot drawing: the bar after the oxidation annealing treatment is heated by a tube furnace to be subjected to hot drawing, and water cooling is carried out at an outlet, wherein the drawing temperature is 740-900 ℃, the drawing speed is 0.49-0.95 m/min, the drawing passes are 13-33 times, and the diameter size range of the bar obtained after drawing is 0.8-5 mm;
6) And carrying out vacuum hot straightening on the drawn bar, heating to 640-790 ℃, and longitudinally cutting the bar to obtain the interface screw.
The following details the steps:
Step 1)
The alloy cast ingot comprises the following chemical components in percentage by weight: al: 5.2-6.7% (e.g., 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%); v:3.4 to 4.3% (e.g., 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%), preferably 3.9 to 4.3%; cu:4.3 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)
Heating the alloy ingot to 950-1150 ℃ (such as 950, 1000, 1050, 1100 and 1150 ℃), preserving heat for 4-5 hours, and performing hot forging, wherein the total forging ratio is 5-7, and forging into a slab with the thickness of 50-60 mm and the width of 500-550 mm along the axial direction of the ingot; cutting the slab into square bars along the length direction, heating to 820-1030 ℃ again (such as 820, 850, 900, 950, 1000 and 1030 ℃), preserving heat for 0.5-1 hour, and cooling with water.
Step 3)
The alloy square bar is heated to 700-830 ℃ (such as 700, 720, 750, 800 and 830 ℃), and is subjected to hot rolling for 1.2-2.2 hours (such as 1.2, 1.5, 1.8, 2 and 2.2 hours), and rolled into bars with the diameter of 10-13 mm in total for 9-10 passes, wherein the deformation amount of each pass in the 1-5 passes is 10-15% (such as 10%, 11%, 12%, 13%, 14% and 15%), the interval time between two adjacent passes in the 1-5 passes is 15-30 s (such as 15s, 17s, 22s, 25s, 28s and 30 s), and the deformation amount of each pass in the 6 passes and the subsequent passes is not more than 23% (such as 10%, 12%, 14%, 15%, 16%, 18% and 20%), and the interval time between two adjacent passes in the 6 passes and the subsequent passes is 25-45 s (such as 28s, 32s, 36s, 38s and 40 s).
Step 4)
The oxidation annealing temperatures are, for example, 570, 620, 650, 660, 680, 700, 720 ℃, and the incubation times are, for example, 0.9, 1.2, 1.4, 1.6 hours.
Preferably, a centerless lathe is used to remove surface defects from the bar prior to the oxidative annealing process.
Step 5)
The drawing temperatures are 740, 780, 820, 860 and 900 ℃, the drawing speeds are 0.5, 0.6, 0.7, 0.8 and 0.9m/min, and the drawing passes are 14, 16, 19, 22, 25, 29 and 30 times.
Preferably, the temperature of the water-cooled cooling water is 10-20 ℃ (such as 10, 12, 14, 15, 16, 18 and 20 ℃), the number of the cooling water nozzles is 2-4, the water flow rate is 1.2-1.9 m/s (such as 1.4, 1.5, 1.6 and 1.8 m/s), and preferably 1.6-1.8 m/s.
Step 6)
The hot straightening temperature is 650, 660, 680, 700, 720, 740, 750 ℃ for example;
preferably, the hot straightening is followed by centerless grinding, polishing and cleaning, and the resulting bar is slit into interface screws.
The size of the interface screw is phi 3-4 mm multiplied by 5-15 mm, the friction coefficient is 0.44-0.45, the elongation is more than or equal to 13%, the cytotoxicity grade is less than or equal to 1 grade, and the pitting potential is more than or equal to 2321mV. Based on the co-culture results of TC4 titanium alloy contaminated with methicillin-resistant staphylococcus aureus bacteria as a comparison benchmark, the interface screw 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 manufacturing an interface screw having a low coefficient of friction, 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:5.2 to 6.7 percent, V:3.4 to 4.3 percent of Cu:4.3 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) Forging: heating the alloy ingot to 950-1150 ℃, preserving heat for 4-5 hours, performing hot forging, wherein the total forging ratio is 5-6, forging into a plate blank along the axial direction of the ingot, and cutting the plate blank into square bars along the length direction; the square rod is heated to 820-1030 ℃ again, kept for 0.5-1 hour and cooled by water;
3) And (3) hot rolling: heating the alloy square bar to 700-830 ℃, carrying out hot rolling after heat preservation for 1.2-2.2 hours, carrying out rolling for 9-10 times, and rolling into bars with the diameter of 10-13 mm, wherein the deformation of each time in the 1 st-5 th times is 10-15%, the interval time between two adjacent times in the 1 st-5 th times is 15-30 s, the deformation of each time in the 6 th and subsequent times is not higher than 23%, and the interval time between two adjacent times in the 6 th and subsequent times is 25-45 s;
4) Oxidation annealing treatment: oxidizing and annealing the bar at 560-730 deg.c for 0.8-1.8 hr and air cooling;
5) And (3) hot drawing: the bar after the oxidation annealing treatment is heated by a tube furnace to be subjected to hot drawing, and water cooling is carried out at an outlet, wherein the drawing temperature is 740-900 ℃, the drawing speed is 0.49-0.95 m/min, the drawing passes are 13-33 times, and the diameter size range of the bar obtained after drawing is 0.8-5 mm;
6) And carrying out vacuum hot straightening on the drawn bar, heating to 640-790 ℃, and longitudinally cutting the bar to obtain the interface screw.
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 interface screw and the design of alloy components, the invention adopts a special processing technology to obtain the interface screw with low friction coefficient, has simple required equipment and processing technology and can meet the requirement of mass production.
(2) The bar for the interface screw produced by the invention can obtain a lower friction coefficient (0.44-0.45) 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.
Fig. 2 is a schematic structural diagram of a hot drawing water cooling device.
Reference numerals: 1-high-purity aluminum net barrel, 2-tube furnace, 3-cooling water nozzle and 4-drawing die.
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 low coefficient of friction interface screw 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) Forging: heating the alloy ingot to 1000 ℃, preserving heat for 4 hours, performing hot forging, wherein the total forging ratio is 5-6, forging into a plate blank along the axial direction of the ingot, and cutting the plate blank into square bars along the length direction. The square rod is heated to 900 ℃ again, kept for 1 hour, and cooled with water.
3) And (3) hot rolling: the alloy square bar was heated to 800 ℃ and heat preserved for 2 hours for hot rolling, and the rolling parameters are shown in table 2. Finally rolling into bars with the diameter of 10-13 mm.
4) Oxidation annealing treatment: the rolled bar is used for removing surface defects by a centerless lathe, the oxidation annealing temperature of the bar is 700 ℃, the heat preservation is carried out for 1.5 hours, and the air cooling is carried out.
5) And (3) hot drawing: the oxidized bar is subjected to hot drawing, and the hot drawing adopts a device with a water cooling device, and the structure of the device is shown in figure 2, and comprises a tube furnace 2, a cooling water nozzle 3 and a drawing die 4. The bar enters into the tube furnace from one end and is heated, then passes through the other end, and is cooled by water at the cooling water nozzle of the outlet, and the drawing parameters are shown in Table 3.
6) And carrying out vacuum hot straightening on the pulled bar, heating to 700 ℃, polishing by a centerless grinder, cleaning, and longitudinally cutting the obtained bar to obtain the interface screw.
The alloy compositions and preparation processes of the respective examples and comparative examples are shown in table 1.
Table 1 titanium alloy compositions (wt.%) and preparation processes used in examples and comparative examples
Table 2 parameters of the rolling process
TABLE 3 thermal pullout process parameters
Test example 1 Performance test
The friction coefficients of the example and comparative materials were tested using a Ball-on-disk Tribometer (MS-T300, china) friction tester. The experimental mode is reciprocating linear sliding friction, the sliding speed is 0.06m/s, the load is 5N, the reciprocating times are 300, and the counter grinding pair is a Si 3N4 ball with the diameter of 4 mm.
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/m1～10.0×105 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. Taking 1ml of eluent stock solution, 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 uniformly mixing to obtain 1: 10. Taking 1:10 elution diluent 1ml was transferred to a sterile petri dish, and the nutrient agar medium cooled to 46℃was immediately poured into the petri dish at about 15ml and the petri dish was turned to mix well. The plating operation was repeated 2 times to obtain 1:10 elution diluent Petri dishes 2. Taking 1:10 eluting diluent 1ml, 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. Taking 1:100 elution dilutions 1ml were transferred to sterile petri dishes, nutrient agar medium cooled to 46℃was immediately injected into the petri dishes for about 15ml, and the petri dishes were rotated to mix well. 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 low coefficient of friction interface screw, 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:5.2 to 6.7 percent, V:3.4 to 4.3 percent of Cu:4.3 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) Forging: heating the alloy ingot to 950-1150 ℃, preserving heat for 4-5 hours, and then performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank along the axial direction of the ingot, and cutting the plate blank into square bars along the length direction; the square rod is heated to 820-1030 ℃ again, kept for 0.5-1 hour and cooled by water;
3) And (3) hot rolling: heating the alloy square bar to 700-830 ℃, carrying out hot rolling after heat preservation for 1.2-2.2 hours, carrying out rolling for 9-10 times, and rolling into bars with the diameter of 10-13 mm, wherein the deformation of each time in the 1 st-5 th times is 10-15%, the interval time between two adjacent times in the 1 st-5 th times is 15-30 s, the deformation of each time in the 6 th and subsequent times is not higher than 23%, and the interval time between two adjacent times in the 6 th and subsequent times is 25-45 s;
4) Oxidation annealing treatment: oxidizing and annealing the bar at 560-730 deg.c for 0.8-1.8 hr and air cooling;
5) And (3) hot drawing: the bar after the oxidation annealing treatment is heated by a tube furnace to be subjected to hot drawing, and water cooling is carried out at an outlet, wherein the drawing temperature is 740-900 ℃, the drawing speed is 0.49-0.95 m/min, the drawing passes are 13-33 times, and the diameter size range of the bar obtained after drawing is 0.8-5 mm;
6) And carrying out vacuum hot straightening on the drawn bar, heating to 640-790 ℃, and longitudinally cutting the bar to obtain the interface screw.
2. The interface screw according to 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 inside of the aluminum mesh barrels is filled with a mixture of aluminum beans, titanium sponge and an AlV intermediate alloy.
3. The interface screw of claim 1, wherein in step 4), the surface defects of the rod are removed using a centerless lathe prior to the oxidative annealing.
4. The interface screw of claim 1, wherein in step 5), the water cooled cooling water has a temperature of 10 to 20 ℃, a number of cooling water nozzles of 2 to 4, and a water flow rate of 1.2 to 1.9m/s.
5. The interface screw of any one of claims 1-4, wherein the interface screw has a coefficient of friction of 0.44 to 0.45, an elongation of greater than or equal to 13%, a cytotoxicity rating of less than or equal to 1, and a pitting potential of greater than or equal to 2321mV.
6. A method for preparing an interface screw with a low friction coefficient, which is characterized by comprising the following steps:
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:5.2 to 6.7 percent, V:3.4 to 4.3 percent of Cu:4.3 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) Forging: heating the alloy ingot to 950-1150 ℃, preserving heat for 4-5 hours, and then performing hot forging, wherein the total forging ratio is 5-7, forging into a plate blank along the axial direction of the ingot, and cutting the plate blank into square bars along the length direction; the square rod is heated to 820-1030 ℃ again, kept for 0.5-1 hour and cooled by water;
3) And (3) hot rolling: heating the alloy square bar to 700-830 ℃, carrying out hot rolling after heat preservation for 1.2-2.2 hours, carrying out rolling for 9-10 times, and rolling into bars with the diameter of 10-13 mm, wherein the deformation of each time in the 1 st-5 th times is 10-15%, the interval time between two adjacent times in the 1 st-5 th times is 15-30 s, the deformation of each time in the 6 th and subsequent times is not higher than 23%, and the interval time between two adjacent times in the 6 th and subsequent times is 25-45 s;
4) Oxidation annealing treatment: oxidizing and annealing the bar at 560-730 deg.c for 0.8-1.8 hr and air cooling;
5) And (3) hot drawing: the bar after the oxidation annealing treatment is heated by a tube furnace to be subjected to hot drawing, and water cooling is carried out at an outlet, wherein the drawing temperature is 740-900 ℃, the drawing speed is 0.49-0.95 m/min, the drawing passes are 13-33 times, and the diameter size range of the bar obtained after drawing is 0.8-5 mm;
6) And carrying out vacuum hot straightening on the drawn bar, heating to 640-790 ℃, and longitudinally cutting the bar to obtain the interface screw.
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 according to claim 6, wherein in step 4), defects on the surface of the bar are removed by using a centerless lathe before the oxidation annealing treatment.
9. The method according to claim 6, wherein in the step 5), the temperature of the water-cooled cooling water is 10 to 20 ℃, the number of the cooling water nozzles is 2 to 4, and the water flow rate is 1.2 to 1.9m/s.
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