CN113430411B - High-performance titanium alloy added with rare earth boride and preparation method thereof - Google Patents
High-performance titanium alloy added with rare earth boride and preparation method thereof Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0073—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only borides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Abstract
The invention discloses a high-performance titanium alloy added with rare earth boride and a preparation method thereof, relating to the field of powder metallurgy; the method comprises mixing spherical TC4 powder and irregular YbB 6 Mixing the powder to obtain a mixture; putting the mixture into a graphite mold in batches; and (4) placing the graphite mold filled with the mixture into an SPS sintering furnace, and sintering under a vacuum state. On one hand, the method adds rare earth boride to obtain a titanium alloy material with higher performance, and can effectively improve the tensile strength, plasticity and wear resistance of the aluminum alloy. On the other hand, the compactness of the titanium alloy in the preparation process is improved through the SPS vacuum sintering process, compared with the material obtained by normal pressure sintering, the material has higher hardness, and meanwhile, the wear resistance of the material is improved.
Description
Technical Field
The invention relates to the field of powder metallurgy, in particular to a high-performance titanium alloy added with rare earth boride and a preparation method thereof.
Background
The TC4 titanium alloy is widely applied to the aspects of aerospace and biomedicine due to high specific strength, corrosion resistance, good biocompatibility and high temperature resistance. However, the as-cast TC4 titanium alloy microstructure obtained by traditional smelting has many casting defects, porosity, component segregation and the like, and the obtained titanium alloy has poor mechanical properties, and needs to eliminate the component segregation and the structure defects through a series of treatments.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a high-performance titanium alloy with high strength and high hardness and added with rare earth boride and a preparation method thereof, wherein the mechanical property of the titanium alloy can be effectively improved by adding the rare earth boride.
The embodiment of the invention is realized by the following steps:
in a first aspect, the invention provides a method for preparing a high-performance titanium alloy added with rare earth boride, which comprises the following steps:
mixing spherical TC4 powder and irregular YbB 6 Mixing the powder to obtain a mixture;
putting the mixture into a graphite mould in batches;
and (4) placing the graphite mold filled with the mixture into an SPS sintering furnace, and sintering under a vacuum state.
In an alternative embodiment, in the mix, the spherical TC4 powder and the irregular YbB 6 The mass ratio of the powder is (99-100): (1-0.1).
In an alternative embodiment, in the mix, the spherical TC4 powder and the irregular YbB 6 The mass ratio of the powder is (99.2-99.5): (0.8-0.5).
In an alternative embodiment, the mix is prepared by mixing a spherical TC4 powder with irregular YbB 6 Adding the powder into a ball milling tank for ball milling to obtain the powder; wherein the rotation speed of ball milling is 200-300 r/min, and the ball-material ratio is (4-8): 1, ball milling for 1-3 h;
alternatively, the first and second electrodes may be,
mixing by mixing spherical TC4 powder and irregular YbB 6 Adding the powder into a ball milling tank for ball milling, and then mixing and stirring the powder to obtain the powder; wherein the rotation speed of ball milling is 200-300 r/min, and the ball-material ratio is (4-8): 1, ball milling for 1-3 h; the stirring speed is 30-40 rpm, and the stirring time is 2-3 h.
In an alternative embodiment, in the step of batch-wise placing the mixture into the graphite mold:
before the materials are put into a graphite mould, the method also comprises the step of wrapping the batch of the mixture by graphite paper.
In an alternative embodiment, in the step of batch-wise placing the mixture into the graphite mold:
15g of the mixed material is added into a graphite mold with phi 20mm each time.
In an alternative embodiment, the sintering operation is performed under vacuum, and in particular, is evacuated to less than 100 MPa.
In an optional embodiment, the sintering operation parameters are sintering temperature of 1000-1200 ℃, sintering rate of 80-100 ℃/min, sintering heat preservation time of 2-10 min and sintering pressure of 25-35 Mpa.
In an optional embodiment, the parameters of the sintering operation are that the sintering temperature is 1100 ℃, the sintering rate is 100 ℃/min, the sintering heat preservation time is 5min, and the sintering pressure is 30 Mpa.
In a second aspect, the present invention provides a high performance titanium alloy with added rare earth boride, which is prepared by the method for preparing the high performance titanium alloy with added rare earth boride in any one of the foregoing embodiments.
The embodiment of the invention has at least the following advantages or beneficial effects:
the embodiment of the invention provides a preparation method of a high-performance titanium alloy added with rare earth boride, which comprises the steps of mixing spherical TC4 powder and irregular YbB 6 Mixing the powders to obtain a mixture; putting the mixture into a graphite mould in batches; and (3) putting the graphite mould filled with the mixture into an SPS sintering furnace, and sintering under a vacuum state. On one hand, the method adds the rare earth boride to obtain the titanium alloy material with higher performance, and the addition of the rare earth boride can inhibit the growth of crystal grains and form a new phase to refine the crystal structure. And in the preparation process, Yb element reacts with oxygen to absorb the oxygen content dissolved in the titanium matrix, so that adverse effects on the performance caused by oxidation of the titanium alloy are avoided, and meanwhile, the generated TiB is dispersed and distributed in the titanium matrix as a reinforcing phase, so that the defects of sintered products are reduced, and the tensile strength, the plasticity and the wear resistance are improved. On the other hand, the compactness of the titanium alloy in the preparation process is improved through the vacuum sintering process of SPS (spark plasma sintering), and compared with a material obtained by normal-pressure sintering, the material obtained by normal-pressure sintering has higher compactnessHardness and improved wear resistance.
The embodiment of the invention also provides a high-performance titanium alloy added with the rare earth boride, which is prepared by the method. Therefore, it has advantages of high strength and high hardness.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a scanning electron microscope image of a high performance titanium alloy with added rare earth boride provided in example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of a high performance titanium alloy with added rare earth boride provided in example 2 of the present invention;
FIG. 3 is a scanning electron microscope image of a high performance titanium alloy with added rare earth boride provided in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
The embodiment of the invention provides a preparation method of a high-performance titanium alloy added with rare earth boride, which comprises the following steps:
s1: mixing spherical TC4 powder and irregular YbB 6 Mixing the powders to obtain a mixture;
s2: putting the mixture into a graphite mold in batches;
s3: and (4) placing the graphite mold filled with the mixture into an SPS sintering furnace, and sintering under a vacuum state.
In detail, in the above-described production method, on the one hand, a titanium alloy material with higher performance can be obtained by adding a rare earth boride. And is embodied in that the rare earth boride can inhibit the growth of crystal grains and form a new phase to refine the crystal structure. And in the preparation process, Yb element reacts with oxygen to absorb the oxygen content dissolved in the titanium matrix, so that adverse effects on the performance caused by oxidation of the titanium alloy are avoided, and meanwhile, the generated TiB is dispersed and distributed in the titanium matrix as a reinforcing phase, so that the defects of sintered products are reduced, and the tensile strength, the plasticity and the wear resistance are improved. On the other hand, since the material is sintered under atmospheric pressure without pressurization in the prior art, the internal porosity of the sintered product is large, and the relative density of the sample reaches 75-90%. The mechanical properties of the sintered product are poor. Therefore, the compactness of the titanium alloy in the preparation process is improved through the SPS vacuum sintering process, the SPS sintering technology obtains a compact sintered block at high temperature and high pressure through the graphite die direct-current pulse voltage heating and the spark discharge heating among powder particles, the mechanical property of a sample is improved, compared with a material obtained through normal-pressure sintering, the material has higher hardness, and meanwhile, the wear resistance of the material is improved. And because of vacuum sintering, the titanium alloy can be effectively prevented from being oxidized in a vacuum state, so that the quality of the prepared titanium alloy can be further improved.
That is, in the embodiment of the present invention, the mechanical properties of the sample can be improved by the SPS sintering technique. Meanwhile, the added rare earth boride is sintered at high temperature in the preparation process to generate an in-situ reaction, so that on one hand, the added rare earth boride absorbs oxygen elements dissolved in the titanium alloy matrix to generate Yb 2 O 3 The oxidation of the titanium alloy is avoided, so that the oxygen content in the titanium matrix is reduced, and the elongation and tensile strength of the material are improved; on the other hand, rare earth YbB is added 6 In the sintering process, the in-situ self-generation reaction is carried out on the titanium substrate at high temperature and high pressure to generate Yb 2 O 3 And TiB as second phase dispersion distributionIn the titanium matrix, the TiB synthesized in situ has higher hardness, can improve the strength of the titanium alloy, simultaneously bears the main load in the abrasion process, reduces the plastic deformation tendency, and improves the abrasion resistance of the titanium alloy.
In more detail, in step S1, in the mixture, the spherical TC4 powder and the irregular YbB 6 The mass ratio of the powder is (99-100): (1-0.1). Mixing spherical TC4 powder and irregular YbB 6 The dosage of the composition is controlled within the range, and irregular YbB can be ensured 6 The powder is subjected to in-situ reaction in high-temperature sintering, on one hand, oxygen elements which are dissolved in the titanium alloy matrix are absorbed to generate Yb 2 O 3 Thereby reducing the oxygen content in the titanium matrix and improving the elongation of the material; yb produced simultaneously 2 O 3 And TiB is taken as a second phase to be dispersed and distributed in the titanium matrix, so that the strength and the wear resistance of the titanium alloy are improved.
Alternatively, in the blend, spherical TC4 powder and irregular YbB 6 The mass ratio of the powder is (99.2-99.5): (0.8-0.5). Similar to the above principle, when the spherical TC4 powder and the irregular YbB are mixed 6 The dosage of the titanium alloy is controlled within the range, so that the strength and the hardness of the prepared titanium alloy can be further ensured, and the titanium alloy has excellent wear resistance.
In more detail, in step S1, the mix is prepared by mixing spherical TC4 powder and irregular YbB 6 Adding the powder into a ball milling tank for ball milling, and then mixing and stirring the powder to obtain the catalyst. Wherein the rotation speed of the ball milling is 200-300 r/min, preferably 300 r/min; the ball material ratio is (4-8): 1, preferably 6:1, and the ball milling time is 1-3 h; the stirring speed is 30-40 rpm, preferably 30-35 rpm; the stirring time is 2-3 h, preferably 2 h.
Specifically, the ball milling operation is carried out in the process of carrying out ball milling by a QM-3SP4 planetary ball mill, and the ball milling mode is adopted for mixing, so that uniformly distributed mixed powder can be obtained, and meanwhile, the ball material ratio and the rotating speed are controlled within the range.
Meanwhile, the step of mixing and stirring the powder is carried out on a ZX-0.5 type double-cone efficient mixer, so that the uniformity of the powder can be further improved, and the quality and the performance of the titanium alloy prepared by later-stage sintering can be ensured. Of course, in other embodiments, the powder mixing or ball milling operation may be performed separately, and in this case, in order to ensure the uniformity of the powder mixing, the operation time may be prolonged appropriately, which is not described in detail in this embodiment.
In more detail, step S2 includes wrapping the batches of mixed materials with graphite paper before placing the mixed materials into the graphite mold. On one hand, the graphite paper is used for wrapping the sample and the die in the sintering process, and on the other hand, titanium alloy oxidation in the sintering process can be further avoided, so that the quality and the performance of the prepared aluminum alloy are further ensured.
Meanwhile, in step S2, 15g of the mixed material was added to the graphite mold of Φ 20mm at a time in batches. The purpose that sets up like this is in the powder volume that the control sintering in-process added, avoids the powder to spill in sintering in-process from the mould to reduce the influence of powder volume to the product performance, and then guarantee the quality and the performance of aluminum alloy. Of course, in other embodiments of the present invention, when the size of the graphite mold changes, the quality of the mixture used for a single time may also be adjusted and improved, and it is only necessary to ensure that the sintering operation is performed efficiently, which is not limited in the embodiments of the present invention.
In more detail, in step S3, the spherical TC4 powder and the sodium YbB are mixed 6 The SPS plasma sintering is selected for sintering after powder mixing, and compared with normal pressure sintering, the SPS plasma sintering method has the advantages that the SPS plasma sintering method can be used for sintering at high temperature, pressurization can be carried out in the heating process, the heating speed is high, the sintering time is greatly saved, the organizational structure is controllable in the sintering process, the SPS plasma sintering method acts on a vacuum environment, and powder pollution is reduced. The obtained sintered block is compact and uniform, the defects are reduced, and the mechanical property of the material is greatly improved. Provides favorable conditions for the application of the titanium alloy.
Meanwhile, the sintering operation is carried out in a vacuum state, and is specifically vacuumized to be below 100 MPa. Through the arrangement, the titanium alloy can be prevented from reacting with oxygen in the air by sintering under vacuum, so that the quality and the performance of the product are ensured.
And, in step S3, the sintering parameters are temperature control for sintering, and the SPS process is divided into four stages of activation and rearrangement of particles, bonding of particles, growth of sintered cake, and overall deformation. When the above four sintering stages are sequentially performed and completely completed, a high-quality sintered cake can be obtained. Therefore, in the embodiment of the invention, the parameters of the sintering operation are that the sintering temperature is 1000-1200 ℃, the sintering speed is 80-100 ℃/min, the sintering heat preservation time is 2-10 min, and the sintering pressure is 25-35 Mpa. And preferably, the parameters of the sintering operation are that the sintering temperature is 1100 ℃, the sintering speed is 100 ℃/min, the sintering heat preservation time is 5min, and the sintering pressure is 30 Mpa. And when the sintering temperature is 1100 ℃, the compact has the best mechanical property. If the sintering temperature is lower than 1100 ℃, the sintered product has more pores and is not compact enough, and the mechanical property is influenced, and when the sintering temperature is higher than 1100 ℃, the performance of the sintered product is not improved, so that the sintering temperature is set to 1100 ℃ in order to save energy consumption and improve the mechanical property of the composite material.
The embodiment of the invention also provides the high-performance titanium alloy added with the rare earth boride, and the high-performance titanium alloy added with the rare earth boride is prepared by the preparation method of the high-performance titanium alloy added with the rare earth boride in any one of the above embodiments. Therefore, the high-performance titanium alloy added with the rare earth boride has the advantages of high strength, high hardness and high wear resistance.
The present invention provides a high performance titanium alloy with added rare earth boride and a method for preparing the same, which will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a high-performance titanium alloy added with rare earth boride, which is prepared by the following method:
s1: the method comprises the following steps of proportioning components of spherical TC4 powder in an argon protective glove isolation box, filling the spherical TC4 powder into a ball milling tank, assembling the material mixing tank in a QM-3SP4 planetary ball mill for ball milling, wherein the ball-material ratio of ball milling is 6:1, the rotating speed is 300r/min, and the ball milling time is 2 h; then mixing the ball-milled powder on a ZX-0.5 type double-cone efficient mixer for 2 hours to obtain a mixture;
s2: wrapping 15g of graphite paper with the mixed powder in batches each time, and placing the powder into a graphite mold with the diameter of 20 mm;
s3: and (2) putting the graphite mould into an SPS sintering furnace, vacuumizing to be below 100MPa, then performing sintering operation, wherein the heating rate is 100 ℃/min, the sintering pressure is 30MPa, the sintering temperature is 1100 ℃, keeping the temperature for 5min, and cooling to room temperature along with the furnace to obtain a compact and uniform titanium alloy sintered body.
Example 2
The embodiment provides a high-performance titanium alloy added with rare earth boride, which is prepared by the following method:
s1: the same mass as in example 1, but at a mass ratio of 99.4: 0.6 spherical TC4 powder and irregular YbB 6 The powder is subjected to component proportioning in an argon protective glove isolation box and is filled into a ball milling tank, the mixing tank is assembled in a QM-3SP4 planetary ball mill for ball milling, and the ball-material ratio of ball milling is 5: 1, the rotating speed is 300r/min, and the ball milling time is 2 h; then mixing the ball-milled powder on a ZX-0.5 type double-cone efficient mixer for 2 hours to obtain a mixture;
s2: wrapping 15g of graphite paper with the mixed powder in batches every time, and putting the wrapped graphite paper into a graphite mould with a diameter of 20 mm;
s3: and (2) putting the graphite mould into an SPS (spark plasma sintering) sintering furnace, vacuumizing to be below 100MPa, then performing sintering operation, wherein the heating rate is 100 ℃/min, the sintering pressure is 30MPa, the sintering temperature is 1100 ℃, keeping the temperature for 2min, and cooling to room temperature along with the furnace to obtain a compact and uniform titanium alloy sintered body.
Example 3
The embodiment provides a high-performance titanium alloy added with rare earth boride, which is prepared by the following method:
s1: the same mass as example 1 but at a mass ratio of 99: 1 spherical TC4 powder and irregular YbB 6 The powder is subjected to component proportioning in an argon protective glove isolation box and is filled into a ball milling tank, the mixing tank is assembled in a QM-3SP4 planetary ball mill for ball milling, and the ball-material ratio of the ball milling is 4: 1, the rotating speed is 200r/min, and the ball milling time is 1 h; then mixing the ball-milled powder on a ZX-0.5 type double-cone efficient mixer for 1h to obtain a mixture;
s2: wrapping 15g of graphite paper with the mixed powder in batches each time, and placing the powder into a graphite mold with the diameter of 20 mm;
s3: and (2) putting the graphite mould into an SPS sintering furnace, vacuumizing to be below 100MPa, then performing sintering operation, wherein the heating rate is 120 ℃/min, the sintering pressure is 35MPa, the sintering temperature is 1200 ℃, preserving heat for 10min, and cooling to room temperature along with the furnace to obtain a compact and uniform titanium alloy sintered body.
Example 4
The embodiment provides a high-performance titanium alloy added with rare earth boride, which is prepared by the following method:
s1: the spherical TC4 powder with the same mass as that of the example 1 is subjected to component proportioning in an argon protective glove isolation box and is filled into a ball milling tank, the mixing tank is assembled in a QM-3SP4 planetary ball mill for ball milling, and the ball-material ratio of the ball milling is 4: 1, the rotating speed is 300r/min, and the ball milling time is 1 h; then mixing the ball-milled powder on a ZX-0.5 type double-cone efficient mixer for 1h to obtain a mixture;
s2: wrapping 15g of graphite paper with the mixed powder in batches each time, and placing the powder into a graphite mold with the diameter of 20 mm;
s3: and (2) putting the graphite mould into an SPS sintering furnace, vacuumizing to be below 100MPa, then performing sintering operation, wherein the heating rate is 80 ℃/min, the sintering pressure is 25MPa, the sintering temperature is 1000 ℃, keeping the temperature for 2min, and cooling to room temperature along with the furnace to obtain a compact and uniform titanium alloy sintered body.
Examples of the experiments
The additives prepared in examples 1 to 4The grain size of particles in a metallographic picture of the high-performance titanium alloy containing the rare earth boride is measured by ImageJ software, the density of a sample is measured by an Archimedes drainage method, the compactness of the sample is obtained by calculation, and the test result is shown in Table 1. Meanwhile, Vickers hardness of the aluminum alloys prepared in examples 1 to 4 was measured using a Vickers microhardness tester (ZHU-S) with a force of 3N applied thereto, tensile strength of the TC4 titanium alloy provided in examples 1 to 4 was measured using a universal machine, and the results of the friction coefficient test of the materials using a pin-and-disc abrasion tester are shown in Table 2. Also, the YbB provided in examples 1 to 3 was observed by a scanning electron microscope 6 The distribution in the titanium alloy matrix and the generation of the second phase have the microscopic morphologies shown in fig. 1, fig. 2 and fig. 3.
TABLE 1 compactness test results of TC4 titanium alloy composite material
TABLE 2 hardness, tensile strength and Friction Performance test results for TC4 titanium alloy composites
According to the data in table 1, it can be seen that the aluminum alloys with higher density and lower internal porosity can be obtained by the preparation methods provided by the embodiments 1 to 4 of the present invention. However, as can be seen from the comparison between examples 1 and 4 and examples 2 and 3, the density and porosity of examples 1 and 4 are inferior to those of examples 2 and 3 with the addition of the irregular boride due to the lack of the irregular boride, and it can be proved that the addition of boride is advantageous for improving the density and porosity of the bare steel, and the addition of YbB 6 The powder is uniformly dispersed in the titanium matrix, so that the titanium-based powder can be used for preparing fine parts. Meanwhile, as can be seen from a comparison of example 1 with example 4, itThe compact has the best mechanical properties when the sintering temperature is maintained at 1100 ℃. As can be seen from the comparison of examples 2 and 3, when the mass ratio of the titanium alloy powder provided in example 2 to the YbB6 powder was 99.4: 0.6, the sintering temperature is 1100 ℃, the sintering rate is 100 ℃/min, and the sintering pressure is 30MPa, the titanium alloy has better comprehensive mechanical property, can obtain titanium alloy with higher performance, and has the advantages of higher density and extremely low internal porosity.
According to the data in table 2, it can be seen that the high performance titanium alloy added with rare earth boride provided in the embodiments 1 to 4 of the present invention is prepared by the preparation method provided in the embodiments of the present invention, so that the hardness, tensile strength and yield strength are all improved to a certain extent, the friction coefficient is reduced, the surface roughness is low, the wear resistance is improved, and the mechanical properties are optimized. In contrast, in examples 1 and 4, since no boride was added, the hardness, tensile strength and yield strength were inferior to those of examples 2 and 3, and the coefficient of friction was relatively high, thus demonstrating that the addition of boride in combination with the preparation method of the present invention can further improve the hardness, strength and coefficient of friction. In addition, it can be seen from a comparison of example 1 with example 4 that the sintered compact has the best mechanical properties when the sintering temperature is maintained at 1100 ℃. As can be seen from a comparison between example 2 and example 3, when the titanium alloy powder provided in example 2 and YbB6 powder were used in a mass ratio of 99.4: 0.6, the sintering temperature is 1100 ℃, the sintering rate is 100 ℃/min, and the sintering pressure is 30MPa, the comprehensive mechanical property is better, the tensile strength of the titanium alloy is improved to 1150, and the tensile strength can be increased by 17.4 percent compared with the prior art; the hardness of the material can be improved to 420HV, and the tensile strength and hardness of the material are obviously improved, so that the material can be used for preparing some wear-resistant parts under poor working conditions.
Meanwhile, as can be seen from the displays in fig. 1 to 3, YbB added 6 When the content is 0.6 percent, the crystal grains are uniformly and dispersedly distributed in the titanium alloy matrix, and YbB is added 6 At a content of 1%, the grains begin to agglomerate.
In conclusion, the high-performance titanium alloy added with the rare earth boride, which is prepared by the method provided by the embodiment of the invention, has the advantages of high strength, high hardness and good wear performance, and the added second phase is uniformly distributed on the surface of the titanium matrix after optimization treatment, so that the titanium alloy composite material with good compactness is obtained by the SPS sintering process, and the comprehensive mechanical property of the prepared titanium alloy is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of a high-performance titanium alloy added with rare earth boride is characterized by comprising the following steps:
mixing spherical TC4 powder and irregular YbB 6 Mixing the powders to obtain a mixture;
putting the mixture into a graphite mold in batches;
placing the graphite mould filled with the mixture into an SPS sintering furnace, and sintering under a vacuum state;
the parameters of the sintering operation are that the sintering temperature is 1000-1200 ℃, the sintering rate is 80-100 ℃/min, the sintering heat preservation time is 2-10 min, and the sintering pressure is 25-35 MPa;
in the step of placing the mixture in batches into the graphite mold: before the mixture is placed into the graphite mould, the mixture in batches is wrapped by graphite paper.
2. The method for preparing a high-performance titanium alloy with addition of rare earth boride according to claim 1, characterized in that:
in the mixture, the spherical TC4 powder and the irregular YbB 6 The mass ratio of the powder is (99-100): (1-0.1).
3. The method for preparing a high-performance titanium alloy with addition of rare earth boride according to claim 2, characterized in that:
in the mixture, the spherical TC4 powder and the irregular YbB 6 The mass ratio of the powder is (99.2-99.5): (0.8-0.5).
4. The method for producing a high-performance titanium alloy with addition of rare earth boride according to any of claims 1 to 3, characterized in that:
the mixture is prepared by mixing the spherical TC4 powder and the irregular YbB 6 Adding the powder into a ball milling tank for ball milling to obtain the powder; wherein the rotation speed of ball milling is 200-300 r/min, and the ball material ratio is (4-8): 1, ball milling for 1-3 h;
alternatively, the first and second electrodes may be,
the mixture is prepared by mixing the spherical TC4 powder and the irregular YbB 6 Adding the powder into a ball milling tank for ball milling, and then mixing and stirring the powder to obtain the powder; wherein the rotation speed of ball milling is 200-300 r/min, and the ball-material ratio is (4-8): 1, ball milling for 1-3 h; the stirring speed is 30-40 rpm, and the stirring time is 2-3 h.
5. The method for preparing a high-performance titanium alloy with addition of rare earth boride according to any of claims 1 to 3, characterized in that in the step of placing the mixture in batches into the graphite mold:
and 15g of mixed material is added into the graphite mould with the phi of 20mm each time.
6. The method for preparing a high-performance titanium alloy added with rare earth boride according to claim 1, characterized in that:
the parameters of the sintering operation are that the sintering temperature is 1100 ℃, the sintering speed is 100 ℃/min, the sintering heat preservation time is 5min, and the sintering pressure is 30 MPa.
7. A high-performance titanium alloy added with rare earth boride is characterized in that:
the high-performance titanium alloy added with the rare earth boride is prepared by the preparation method of the high-performance titanium alloy added with the rare earth boride in any one of claims 1 to 6.
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