A high-performance titanium alloy for artificial joints and its preparation method

Abstract

The present disclosure provides a high-performance titanium alloy for artificial joints and a preparation method thereof. The chemical composition of the titanium alloy includes: Nb, with a mass ratio of (13-15) wt.%; Mo, with a mass ratio of (5-6) wt.%; Zr, with a mass ratio of (5-6) wt.%; and the balance is Ti. The method includes: obtaining raw materials according to the above-mentioned component ratio and mixing them evenly; performing vacuum consumable melting on the evenly mixed raw materials to obtain an alloy ingot; forging and rolling the alloy ingot to obtain a rolled bar; skiving the surface of the rolled bar to obtain a blank; heat-treating the blank to obtain a titanium alloy bar blank; and performing finish machining on the titanium alloy bar blank to obtain a titanium alloy bar, which is the high-performance titanium alloy for artificial joints. The present invention adopts an alloying composition ratio design of Nb = (13-15) wt.%, Mo = (5-6) wt.%, and Zr = (5-6) wt.%. The prepared titanium alloy has high strength and a low elastic modulus, and the elastic modulus is half of that of the titanium alloy Ti6Al4V, which is closer to the elastic modulus of human bones. During use, it can effectively avoid the occurrence of application shielding and improve the safety and service life of use.

Description

Technical Field

[0001] The present disclosure relates to the technical field of artificial joint surgical implants, and in particular to a high-performance titanium alloy for artificial joints and a preparation method thereof. Background Art

[0002] In the field of surgical implants, artificial joints are mainly used for joint replacement in the hip, knee, shoulder and other parts of the human body. In the process of clinical application, they are subjected to great stress, and the comprehensive performance requirements of joint materials are high. The materials need to have high strength, high toughness and good wear resistance. Since the joints will generate great friction during use, the wear resistance of the materials is required to be high. At the same time, due to the friction characteristics of the materials, metal fragments will detach from the instrument parts and merge into the human tissue, so the biocompatibility of the materials is particularly important. In addition, the long-term use of artificial joints in the human body will cause stress shielding due to the matching problem between the force and the elastic modulus of the bones, causing the artificial joints to shift and fail.

[0003] At present, titanium alloy materials, such as pure titanium 4A and titanium alloy Ti6Al4V, are widely used. For example, the patent number CN103436831B discloses a method for preparing titanium alloy rods for surgical implants, which is obtained by blank preparation-opening forging-deformation processing-annealing treatment-hot straightening-finishing treatment-secondary polishing. The method for preparing titanium alloy rods for surgical implants of the present invention improves the quality and performance of titanium alloy rods through three straightening and three annealing treatments, and meets export requirements. In addition, the present invention heats and insulates the titanium alloy ingot, uses a hammering device to make its deformation rate reach 50-60%, and then performs 6-9 times of upsetting to improve the density of the titanium alloy. Moreover, the temperature used in the intermediate forging and rolling products is lower than the phase transition point of the titanium alloy, 970°C, thereby ensuring the performance and metallographic structure of the titanium alloy rods.

[0004] It can be seen that the above-mentioned prior art still uses titanium alloy ingots that meet the requirements of GB / T 13810-2017 as blanks. However, although these titanium alloys have low costs and mature processing and manufacturing processes, combined with the application characteristics and requirements of joints, these alloys have low strength, elements that are not compatible with the human tissue environment, and poor matching with the elastic modulus of bones. Therefore, the development of titanium alloy materials that can obtain high strength, low elastic modulus, and excellent biocompatibility can significantly improve the safety of joints and increase their service life.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The purpose of the present disclosure is to provide a high-performance titanium alloy for artificial joints and a preparation method thereof. Furthermore, it is necessary to develop a titanium alloy material that can obtain high strength, low elastic modulus, and excellent biocompatibility.

[0007] Other characteristics and advantages of the present disclosure will become apparent through the following detailed description, or be learned partially through the practice of the present disclosure.

[0008] According to the first aspect of the present disclosure, a high-performance titanium alloy for artificial joints is provided. By mass percentage, the chemical composition of the titanium alloy includes:

[0009] Nb, with a mass ratio of: (13 - 15) wt.%;

[0010] Mo, with a mass ratio of: (5 - 6) wt.%;

[0011] Zr, with a mass ratio of: (5 - 6) wt.%;

[0012] The balance is Ti.

[0013] According to the second aspect of the present disclosure, a preparation method of a high-performance titanium alloy for artificial joints is provided, including:

[0014] According to the above-mentioned component ratio, obtain raw materials and mix them evenly;

[0015] Vacuum consumable melting of the evenly mixed raw materials to obtain an alloy ingot;

[0016] Forging and rolling the alloy ingot to obtain a rolled bar;

[0017] Skim the surface of the rolled bar to obtain a blank;

[0018] Heat-treat the blank to obtain a titanium alloy bar blank;

[0019] Finish-machine the titanium alloy bar blank to obtain a titanium alloy bar, and the titanium alloy bar is the high-performance titanium alloy for artificial joints.

[0020] Optionally, the step of heat-treating the blank to obtain a titanium alloy bar blank includes:

[0021] Solution-treat the blank;

[0022] Perform heating-holding-cooling treatment on the solution-treated blank and repeat it multiple times to obtain a titanium alloy bar blank.

[0023] Optionally, the step of solution-treating the blank includes:

[0024] Heat the blank to 820 °C and hold for 90 minutes;

[0025] Put the blank after holding into flowing water for cooling until it reaches room temperature;

[0026] Transfer the blank cooled to room temperature to liquid nitrogen for cryogenic treatment to obtain the solution-treated blank.

[0027] Optionally, the step of heating-insulating-cooling the solution-treated blank and repeating it multiple times to obtain the titanium alloy bar blank includes:

[0028] The first heating: heat the solution-treated blank to 520 °C, hold for 2 hours, and then air-cool to room temperature;

[0029] The second heating: heat the blank after the first heating treatment to 460 °C, hold for 2 hours, and air-cool to room temperature; thus obtaining the titanium alloy bar blank.

[0030] Optionally, in the step of obtaining raw materials and mixing them evenly:

[0031] Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the rest is sponge titanium.

[0032] Optionally, the step of vacuum consumable melting the mixed raw materials to obtain an alloy ingot includes:

[0033] Make the mixed raw materials into electrodes;

[0034] Perform vacuum consumable melting on the electrodes to obtain alloy ingots;

[0035] Among them, the ingot type is Φ600mm in diameter, and the single weight of the alloy ingot is 3000 kg.

[0036] Optionally, in the step of forging and rolling the alloy ingot to obtain a rolled bar, the diameter of the rolled bar is Φ55 - 95 mm.

[0037] Optionally, the diameter of the titanium alloy bar is Φ50 - 90 mm.

[0038] The present disclosure provides a high-performance titanium alloy for artificial joints and a preparation method thereof. The chemical composition of the titanium alloy includes: Nb, with a mass ratio of (13-15) wt.%; Mo, with a mass ratio of (5-6) wt.%; Zr, with a mass ratio of (5-6) wt.%; and the rest is Ti. The method includes: obtaining raw materials according to the above composition ratio and mixing them evenly; performing vacuum consumable melting on the evenly mixed raw materials to obtain an alloy ingot; forging and rolling the alloy ingot to obtain a rolled bar; peeling the surface of the rolled bar to obtain a blank; heat-treating the blank to obtain a titanium alloy bar blank; and performing finish machining on the titanium alloy bar blank to obtain a titanium alloy bar, which is the high-performance titanium alloy for artificial joints. The present invention adopts an alloying composition ratio design of Nb = (13-15) wt.%, Mo = (5-6) wt.%, and Zr = (5-6) wt.%. The prepared titanium alloy has high strength and a low elastic modulus, and the elastic modulus is half of that of the titanium alloy Ti6Al4V, which is closer to the elastic modulus of human bones. During use, it can effectively avoid the occurrence of application shielding and improve the safety and service life of use.

[0039] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Brief Description of the Drawings

[0040] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0041] Figure 1 Schematically showing a heat treatment process schematic diagram of a Ti14.1Nb5.6Mo5.2Zr titanium alloy in an exemplary embodiment of the present disclosure.

[0042] Figure 2 Schematically showing a microstructure morphology diagram of a blank after solution treatment in an exemplary embodiment of the present disclosure.

[0043] Figure 3 Schematically showing a schematic diagram of a microstructure morphology diagram of the titanium alloy bar blank obtained by sequentially performing a first heating and a second heating once in an exemplary embodiment of the present disclosure.

[0044] Figure 4 Schematically showing a schematic diagram of a microstructure morphology diagram of the titanium alloy bar blank obtained by sequentially performing a first heating and a second heating twice in an exemplary embodiment of the present disclosure. Detailed Description of the Embodiments

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0046] In the prior art, titanium alloy ingots that meet the requirements of the GB / T 13810-2017 standard are still used as blanks. Although these titanium alloys have low costs and mature processing and manufacturing processes, considering the application characteristics and requirements of joints, these alloys have problems such as low strength, elements that do not fit well with the human tissue environment, and poor matching of the elastic modulus with bones. Therefore, developing a titanium alloy material that can obtain high strength, low elastic modulus, and excellent biocompatibility can significantly improve the use safety and service life of joints.

[0047] To solve this problem, the technical solution of this application is proposed as follows:

[0048] Example 1

[0049] According to the first aspect of the present disclosure, a high-performance titanium alloy for artificial joints is provided. By mass percentage, the chemical composition of the titanium alloy includes: Nb, with a mass ratio of (13-15) wt.%; Mo, with a mass ratio of (5-6) wt.%; Zr, with a mass ratio of (5-6) wt.%; and the balance is Ti.

[0050] In this example embodiment, during the actual process of obtaining the raw materials for preparing the high-performance titanium alloy for artificial joints, Nb can be added in the form of NbTi master alloy, Mo can be added in the form of TiMo master alloy, Zr can be added in the form of sponge zirconium, and the remaining components can be supplemented with sponge titanium. It should be noted that during the matching process of the selected raw materials, it is necessary to ensure the proportion of the foregoing components.

[0051] In this example embodiment, the present application adopts an alloying composition ratio design of Nb = (13-15) wt.%, Mo = (5-6) wt.%, and Zr = (5-6) wt.%. The prepared titanium alloy has a low elastic modulus, which is half of that of the titanium alloy Ti6Al4V and is closer to the elastic modulus of human bones. During use, it can effectively avoid the occurrence of application shielding and improve the use safety and service life.

[0052] According to the second aspect of the present disclosure, a preparation method for a high-performance titanium alloy for artificial joints is provided, including: step S110-step S160.

[0053] Step S110. Obtain raw materials according to the above-mentioned component ratios and mix them evenly.

[0054] Specifically, Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the rest is sponge titanium. The above raw materials are weighed and mixed evenly according to the ratio.

[0055] Step S120. Vacuum consumable melting of the evenly mixed raw materials to obtain an alloy ingot.

[0056] Specifically, electrodes are made from the above-mentioned evenly mixed raw materials, and vacuum consumable melting is carried out three times to obtain an alloy ingot. As a preferred embodiment, the ingot diameter of the above alloy ingot can be Φ600mm. Of course, it can also be other sizes, and the specific operator can determine according to the actual processing requirements. The single weight of the above alloy ingot can be 3000kg. Of course, it can also be other weights, and the specific operator can determine according to the actual processing requirements.

[0057] Step S130. Forge and roll the alloy ingot to obtain a rolled bar.

[0058] Specifically, a rolled bar with a diameter of Φ55 - 95mm can be obtained after forging and rolling the alloy ingot. In this embodiment, existing forging machines and rolling mills can be selected for forging and rolling. It can be understood that forging and rolling are to make the alloy ingot more uniform and make it into a rolled bar with a target diameter. Among them, the target diameter can be the aforementioned Φ55 - 95mm, or it can be other diameters. Specifically, the operator can determine according to the actual production and processing requirements, and this application does not make a limitation.

[0059] Step S140. Skin the surface of the rolled bar to obtain a blank.

[0060] Specifically, skinning the surface of the rolled bar can be achieved by selecting an existing skinning machine. This application does not limit the type and model of the skinning machine. Those skilled in the art can adjust the working parameters of the skinning machine according to the actual diameter of the rolled bar. The specific parameter adjustment process is not limited in this application. It should be noted that in this application, after skinning the rolled bar, a blank can be obtained, and this blank is the raw material in the heat treatment process.

[0061] Step S150. Heat-treat the blank to obtain a titanium alloy bar blank.

[0062] Specifically, the heat treatment process can include: solution heat treatment and cyclic aging heat treatment. Specifically, the solution heat treatment can be to heat the blank to 820°C, hold for 90 minutes, and after reaching the temperature, quickly put it into flowing water for cooling, cool to room temperature, and then quickly transfer it to liquid nitrogen for cryogenic treatment. The microstructure morphology of the blank after solution heat treatment is asFigure 2 as shown

[0063] The cyclic aging heat treatment can be performed on the blank after liquid nitrogen treatment. Then, it is reheated to 520°C, held for 2 hours, and then air-cooled to room temperature. Subsequently, it is reheated to 460°C, held for 2 hours, and then air-cooled to room temperature. The above two-step heat treatment can be cycled multiple times.

[0064] For example: After solution heat treatment, a titanium alloy bar blank 1 is obtained. When performing cyclic aging heat treatment on the titanium alloy bar blank 1, the following steps are carried out:

[0065] Heat the titanium alloy bar blank 1 to 520°C, hold for 2 hours, and air-cool to room temperature; then reheat the titanium alloy bar blank cooled to room temperature to 460°C, hold for 2 hours, and then air-cool to room temperature; complete the first cycle to obtain the titanium alloy bar blank 1 after the first cycle; see the microstructure morphology diagram of the titanium alloy bar blank 1 after the first cycle in Figure 3 as shown

[0066] Heat the titanium alloy bar blank 1 after the first cycle to 520°C, hold for 2 hours, and air-cool to room temperature; then reheat the titanium alloy bar blank cooled to room temperature to 460°C, hold for 2 hours, and then air-cool to room temperature; complete the second cycle to obtain the titanium alloy bar blank 1 after the second cycle; see the microstructure morphology diagram of the titanium alloy bar blank 1 after the second cycle in Figure 4 as shown

[0067] Subsequent third, fourth, etc. cycles can be carried out. This application does not limit the number of the above cycles. It can be understood that in this application, only the titanium alloy bar blank 1 after the first cycle can be used as the titanium alloy bar blank described in this application, or the titanium alloy bar blank 2 after two cycles can be used as the titanium alloy bar blank described in this application, or the titanium alloy bar blank n after n cycles can be used as the titanium alloy bar blank described in this application. It can be seen that the key point protected by this application lies in: the process of solution heat treatment and cyclic aging heat treatment adopted in this application, rather than the number of cycles in the cyclic aging heat treatment process.

[0068] Step S160. Finish machining the titanium alloy bar blank to obtain a titanium alloy bar, and the titanium alloy bar is the high-performance titanium alloy for artificial joints.

[0069] Specifically: Perform precision machining on the heat-treated titanium alloy bar blank to obtain a titanium alloy bar with a diameter of Φ50 - 90mm. This titanium alloy bar is the high-performance titanium alloy for artificial joints to be prepared in this application, and the operator can use this high-performance titanium alloy for artificial joints as the raw material for surgical implants.

[0070] It can be understood that in this application, the example is a method for manufacturing a titanium alloy rod with a finished product diameter of Φ50 - 90 mm. Those skilled in the art can set the finished product size according to the actual size of the finished product and correspond it to the preparation process of steps S110 - S160 in this application. This application does not limit the size of the finished titanium alloy rod. Any titanium alloy rod with other diameters manufactured by using the preparation process of this application belongs to the protection scope of this application.

[0071] In this exemplary embodiment, the present invention adopts a specific cyclic heat treatment process technology. First, through the cryogenic cooling of liquid nitrogen in solution treatment, a fully β-phase structure is obtained. Then, through multi-stage aging treatment, β→α + β phase transformation occurs, and fine needle-shaped α + β phases precipitate in the β matrix. Moreover, the more the number of cycles, the more the content of the precipitated fine needle-shaped α + β phases, thereby enabling the titanium alloy to obtain the characteristics of high strength and high toughness. The mechanical properties of the material exceed those of conventional titanium alloys such as Ti6Al4V, further improving the anti-fatigue fracture ability of the material. It can be seen that: through reasonable alloying design and the adoption of specific heat treatment technology, the present invention takes into account both biocompatibility and mechanical compatibility, and is an ideal titanium alloy material for manufacturing artificial joints.

[0072] In a specific embodiment, the step of heat-treating the blank to obtain a titanium alloy rod blank includes: performing solution treatment on the blank; heating - insulating - cooling the blank after solution treatment, and repeating it multiple times to obtain a titanium alloy rod blank.

[0073] In a specific embodiment, the step of performing solution treatment on the blank includes: heating the blank to 820 °C and insulating for 90 minutes; placing the blank after insulation into flowing water for cooling until it reaches room temperature; transferring the blank cooled to room temperature to liquid nitrogen for cryogenic treatment to obtain the blank after solution treatment.

[0074] In a specific embodiment, the step of heating - insulating - cooling the blank after solution treatment and repeating it multiple times to obtain a titanium alloy rod blank includes: the first heating, heating the blank after solution treatment to 520 °C, insulating for 2 hours, and then air-cooling to room temperature; the second heating, heating the blank after the first heating treatment to 460 °C, insulating for 2 hours, and air-cooling to room temperature; to obtain the titanium alloy rod blank.

[0075] In a specific embodiment, the first heating and the second heating are sequentially performed at least once to obtain the titanium alloy rod blank.

[0076] In a specific embodiment, in the step of obtaining raw materials and mixing them evenly: Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the rest is sponge titanium.

[0077] In a specific embodiment, the steps of vacuum consumable melting the mixed raw materials to obtain alloy ingots include: making the mixed raw materials into electrodes; performing vacuum consumable melting on the electrodes to obtain alloy ingots; wherein, the ingot type is Φ600mm in diameter, and the single weight of the alloy ingot is about 3000 kg.

[0078] In a specific embodiment, in the steps of forging and rolling the alloy ingot to obtain a rolled bar, the diameter of the rolled bar is Φ55 - 95 mm.

[0079] In a specific embodiment, the diameter of the titanium alloy bar is Φ50 - 90 mm.

[0080] Example 2

[0081] On the basis of Example 1, this example takes the production of a titanium alloy bar with a diameter of Φ50 as an example to further describe the technical solution of the present application in detail, including the following steps:

[0082] 1. Alloy design: Chemical composition of the titanium alloy: Nb = (13 - 15) wt.%, Mo = (5 - 6) wt.%, Zr = (5 - 6) wt.%, and the balance is Ti.

[0083] 2. Ingot preparation: Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the rest is sponge titanium. The above raw materials are weighed and mixed evenly according to the ratio to prepare electrodes, and vacuum consumable melting is carried out three times to obtain alloy ingots. The ingot type is Φ600mm in diameter, and the single weight of the ingot is about 3000 kg.

[0084] 3. Bar blank preparation: The ingot is forged and rolled to obtain a rolled bar with a diameter of Φ55mm, and the surface of the rolled bar is peeled to obtain a heat treatment blank.

[0085] 4. Heat treatment: (1) Solution treatment: Heat the blank to 820 °C and hold for 90 minutes. After reaching the temperature, quickly put it into flowing water for cooling until it reaches room temperature, and then quickly transfer it to liquid nitrogen for cryogenic treatment. (2) Cyclic aging: For the blank after liquid nitrogen treatment, heat it to 520 °C and hold for 2 hours, then air-cool to room temperature, then heat it to 460 °C and hold for 2 hours, and then air-cool to room temperature. The above two-step heat treatment can be cycled multiple times.

[0086] 5. The bar blank after heat treatment is subjected to precision machining to obtain a Φ50mm titanium alloy bar.

[0087] Example 3

[0088] On the basis of the above Examples 1 and 2, this example takes the production of a Ti14.1Nb5.6Mo5.2Zr titanium alloy bar as an example for specific description:

[0089] 1. Alloy Design: Chemical composition of the titanium alloy: Nb = 14.1 wt.%, Mo = 5.6 wt.%, Zr = 5.2 wt.%, and the balance is Ti.

[0090] 2. Ingot Preparation: Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the rest is sponge titanium. The above raw materials are weighed and mixed evenly according to the ratio, an electrode is prepared, and vacuum consumable melting is carried out three times to obtain an alloy ingot. The ingot type is Φ600 mm in diameter, and the single weight of the ingot is about 3000 kg.

[0091] 3. Bar Blank Preparation: After forging and rolling the ingot, a rolled bar with a diameter of Φ55 mm is obtained, and the surface of the rolled bar is peeled to obtain a heat treatment blank.

[0092] 4. Refer to Figure 1 as shown Figure 1 The process schematic diagram of the heat treatment in this application is shown, specifically including: (1) Solution treatment: The blank is heated to 820 °C and held for 90 minutes. After reaching the temperature, it is quickly put into flowing water for cooling until it reaches room temperature, and then quickly transferred to liquid nitrogen for cryogenic treatment. (2) Cyclic aging: The blank after liquid nitrogen treatment is heated to 520 °C and held for 2 hours, then air-cooled to room temperature, then heated to 460 °C and held for 2 hours, and then air-cooled to room temperature. The above two-step heat treatment can be cycled multiple times.

[0093] 5. After heat treatment, the bar blank is subjected to precision machining to obtain a titanium alloy bar with a diameter of Φ50 mm and a composition of Ti14.1Nb5.6Mo5.2Zr.

[0094] Example 4

[0095] Based on the foregoing Examples 1 - 3, this example gives a comparison of the comprehensive properties of titanium alloy bars with a diameter of Φ50 mm. Specifically, a 4A titanium alloy with a diameter of Φ50 mm, a Ti6Al4V titanium alloy with a diameter of Φ50 mm, and a Ti14.1Nb5.6Mo5.2Zr titanium alloy bar with a diameter of Φ50 mm prepared in this application are selected for comparison. The results are shown in Table 1 below:

[0096]

[0097] Table 1

[0098] As shown in Table 1, the titanium alloy bar with a diameter of Φ50 mm of Ti14.1Nb5.6Mo5.2Zr provided in this application, after solution treatment and then secondary cyclic aging treatment, has increased tensile strength, yield strength, fatigue limit, and elastic modulus compared with the titanium alloy bar after solution treatment and then one-time cyclic aging treatment.

[0099] Compare the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ50mm provided by this application with the 4A titanium alloy with a diameter of Φ50mm: Whether it is the titanium alloy rod after one - cycle aging treatment or two - cycle aging treatment, the tensile strength, yield strength, and fatigue limit of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution are far superior to those of the 4A titanium alloy with a diameter of Φ50mm. In addition, the elastic modulus of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution is much lower than that of the 4A titanium alloy with a diameter of Φ50mm.

[0100] Compare the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ50mm provided by this application with the Ti6Al4V titanium alloy with a diameter of Φ50mm: Whether it is the titanium alloy rod after one - cycle aging treatment or two - cycle aging treatment, the tensile strength, yield strength, and fatigue limit of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution are superior to those of the Ti6Al4V titanium alloy with a diameter of Φ50mm. In addition, the elastic modulus of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution is much lower than that of the Ti6Al4V titanium alloy with a diameter of Φ50mm.

[0101] This embodiment gives a comprehensive performance comparison of titanium alloy rods with a diameter of Φ60mm. Specifically, select the 4A titanium alloy with a diameter of Φ60mm, the Ti6Al4V titanium alloy with a diameter of Φ60mm, and the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ60mm prepared by this application for comparison.

[0102]

[0103] Table 2

[0104] As shown in Table 2, for the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ60mm provided by this application, after solution treatment and then two - cycle aging treatment, compared with the titanium alloy rod after solution treatment and then one - cycle aging treatment, its tensile strength, yield strength, fatigue limit, and elastic modulus have all increased.

[0105] Compare the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ60mm provided by this application with the 4A titanium alloy with a diameter of Φ60mm: Whether it is a titanium alloy rod subjected to one - cycle aging treatment or two - cycle aging treatment, the tensile strength, yield strength, and fatigue limit of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution are far superior to those of the 4A titanium alloy with a diameter of Φ60mm. In addition, the elastic modulus of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution is much lower than that of the 4A titanium alloy with a diameter of Φ60mm.

[0106] Compare the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod with a diameter of Φ60mm provided by this application with the Ti6Al4V titanium alloy with a diameter of Φ60mm: Whether it is a titanium alloy rod subjected to one - cycle aging treatment or two - cycle aging treatment, the tensile strength, yield strength, and fatigue limit of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution are superior to those of the Ti6Al4V titanium alloy with a diameter of Φ60mm. In addition, the elastic modulus of the Ti14.1Nb5.6Mo5.2Zr titanium alloy rod provided by this solution is much lower than that of the Ti6Al4V titanium alloy with a diameter of Φ60mm.

[0107] In summary, by using the high - performance titanium alloy for artificial joints and its preparation method provided by this application, a titanium alloy material with high strength, low elastic modulus, and excellent biocompatibility can be obtained, which can significantly improve the use safety of joints and extend their service life.

[0108] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the claims.

[0109] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A preparation method of a high-performance titanium alloy for artificial joints, characterized in that, By mass percentage, the chemical composition of the titanium alloy includes: Nb, with a mass fraction of: (13 - 15) wt.%; Mo, with a mass fraction of: (5 - 6) wt.%; Zr, with a mass fraction of: (5 - 6) wt.%; The balance is Ti; The method includes: obtaining raw materials according to the component ratio and mixing them evenly; Vacuum consumable electrode melting the evenly mixed raw materials to obtain an alloy ingot; Forging and rolling the alloy ingot to obtain a rolled bar; Skiving the surface of the rolled bar to obtain a blank; Heat-treating the blank to obtain a titanium alloy bar blank; Finishing the titanium alloy bar blank to obtain a titanium alloy bar, and the titanium alloy bar is a high-performance titanium alloy for artificial joints; Among them, heat-treating the blank to obtain a titanium alloy bar blank includes: Performing solution treatment on the blank; Heating the blank to 820 °C and holding for 90 minutes; Putting the held blank into flowing water for cooling until it reaches room temperature; Transferring the blank cooled to room temperature to liquid nitrogen for cryogenic treatment to obtain a solution-treated blank; Performing heating-holding-cooling treatment on the solution-treated blank and cycling 2 times to obtain a titanium alloy bar blank, including: The first heating: heating the solution-treated blank to 520 °C, holding for 2 hours, and then air-cooling to room temperature; The second heating: heating the blank after the first heating treatment to 460 °C, holding for 2 hours, and air-cooling to room temperature; obtaining the titanium alloy bar blank.

2. The preparation method of the high-performance titanium alloy for artificial joints according to claim 1, characterized in that, In the step of obtaining raw materials and mixing them evenly: Nb is added in the form of NbTi master alloy, Mo is added in the form of TiMo master alloy, Zr is added in the form of sponge zirconium, and the balance is sponge titanium.

3. The preparation method of the high-performance titanium alloy for artificial joints according to claim 1, characterized in that, The step of vacuum consumable electrode melting the evenly mixed raw materials to obtain an alloy ingot includes: Making the evenly mixed raw materials into an electrode; Performing vacuum consumable electrode melting on the electrode to obtain an alloy ingot; Among them, the ingot type is Φ600 mm in diameter, and the single weight of the alloy ingot is 3000 kg.

4. The preparation method of the high-performance titanium alloy for artificial joints according to claim 1, wherein, In the step of forging and rolling the alloy ingot to obtain a rolled bar, the diameter of the rolled bar is Φ55 - 95 mm.

5. The preparation method of the high-performance titanium alloy for artificial joints according to claim 1, characterized in that, The diameter of the titanium alloy bar is Φ50 - 90 mm.

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