Functionalized boron alkene-graphene composite powder, titanium-based composite powder and preparation method of functionalized boron alkene-graphene composite powder

Abstract

The invention belongs to the technical field of titanium-based composite material preparation, and particularly relates to functionalized boron alkene-graphene composite powder, titanium-based composite powder and a preparation method thereof.The preparation method of the functionalized boron alkene-graphene composite powder comprises the steps that under the first protective atmosphere, graphene and sodium borohydride are evenly mixed, and mixed powder is obtained; the mixed powder is heated and calcined in a sectional mode under the second protective atmosphere or the vacuum condition, an obtained calcined product is placed in a first alcohol solvent to remove sodium metal elementary substances, and then first filtering and first drying are carried out to obtain the sodium-ion battery negative electrode material. Compared with an existing high-energy ball milling method and a traditional wet mixing method, the preparation method of the functionalized boron alkene-graphene composite powder can uniformly disperse the graphene on the surface of the titanium powder and uniformly adsorb the functionalized boron alkene-graphene composite powder on the surface of the titanium powder on the premise of ensuring the integrity and quality of graphene crystal lattices.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of titanium matrix composites, and particularly relates to a functionalized borophene-graphene composite powder and a titanium matrix composite powder and a preparation method thereof. Background Art

[0002] With the continuous development of fields such as aerospace, the performance requirements for structural components of aerospace vehicles are becoming increasingly stringent. Existing materials can no longer meet the development needs of high speed and large payloads. To ensure the safety and stability during flight and avoid the failure of structural components caused by high-speed airflow impact, excessive stress, low-frequency resonance, etc., there is an urgent need to develop a material with high modulus, high strength and high toughness. For titanium matrix composites, their performance is often improved by adding second-phase reinforcement particles. As a two-dimensional material composed of a single layer of carbon atoms, graphene has shown great application prospects in the field of enhancing titanium matrix composites due to its unique two-dimensional structure and excellent mechanical properties, such as engine structural components of aerospace vehicles and high-performance light armor in the field of military equipment. However, due to the high van der Waals force and high surface energy of graphene itself, it is prone to agglomeration during the processing and preparation process, resulting in agglomeration of the reinforcement in the workpiece and deteriorating the performance of the workpiece. Moreover, there is a high reactivity between carbon and titanium, and titanium carbide is easily formed during the processing and preparation process, destroying the lattice structure of graphene and unable to exert its excellent physical properties. In the field of titanium matrix composites, graphene often fails to exert its excellent strengthening performance due to these two major bottleneck problems.

[0003] At present, the preparation of graphene-reinforced titanium matrix composites in powder form is generally carried out by the following two methods:

[0004] The first is the high-energy ball milling dispersion method. Graphene powder, titanium powder, and grinding balls are placed together in a grinding jar, and the graphene is mechanically exfoliated and dispersed by high-energy ball milling to achieve the refinement and uniform distribution of graphene on the surface of titanium powder, improve the dispersibility of the powder, and reduce agglomeration. However, in this process, due to the high-energy collision between the grinding balls and graphene during ball milling, it will cause great damage to the lattice structure of graphene, increasing its structural defects and making it more likely to react in subsequent processing, generating titanium carbide and losing the excellent intrinsic strengthening effect of graphene.

[0005] The second is the wet mixing dispersion method. Due to its unique two-dimensional structure, pristine graphene lacks polar groups that form strong interactions with water molecules, making it difficult to disperse evenly in aqueous solution. At the same time, the van der Waals force between graphene sheets is strong, making the sheets easy to aggregate, further reducing the contact area with water molecules. In order to improve the dispersibility of graphene in aqueous solution, chemical modification methods are usually used, such as using strong sulfuric acid and strong nitric acid to introduce oxygen-containing functional groups on the surface of graphene, converting it into graphene oxide, and enhancing its dispersibility in water through the hydrophilicity of oxygen-containing functional groups. However, this modification method will also destroy the lattice structure of graphene. The introduction of oxygen-containing functional groups destroys the complete six-membered ring structure of graphene, which is not conducive to the intrinsic strengthening effect of graphene in subsequent processing.

[0006] Therefore, in view of the above shortcomings, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a functionalized borophene-graphene composite powder and a titanium-based composite powder and a preparation method thereof. Compared with the existing high-energy ball milling method and the traditional wet mixing method, the preparation method of the functionalized borophene-graphene composite powder in the present invention can disperse the graphene evenly on the surface of titanium powder while ensuring the integrity and quality of the graphene lattice, so that the functionalized borophene-graphene composite powder is evenly adsorbed on the surface of titanium powder.

[0008] The first aspect of the present invention provides a method for preparing a functionalized borophene-graphene composite powder, the preparation method comprising: under a first protective atmosphere, uniformly mixing graphene and sodium borohydride to obtain a mixed powder; heating and calcining the mixed powder in a second protective atmosphere or under vacuum conditions in a segmented manner, and placing the obtained calcined product in a first alcohol solvent to remove sodium metal element, and then subjecting the product to a first filtration and a first drying to obtain the functionalized borophene-graphene composite powder.

[0009] In some embodiments of the present invention, the mass ratio of the graphene to the sodium borohydride is 1:(1-4).

[0010] In some embodiments of the present invention, the mass ratio of the graphene to the sodium borohydride is 1:(2-4).

[0011] In some embodiments of the present invention, a three-stage heating calcination is adopted, wherein the first stage calcination temperature is 460°C to 490°C, the second stage calcination temperature is 530°C to 550°C, and the third stage calcination temperature is 600°C to 650°C.

[0012] In some embodiments of the present invention, the first calcination time is 2 hours to 2.5 hours, the second calcination time is 0.5 hours to 1 hour, and the third calcination time is 0.5 hours to 1 hour.

[0013] In some embodiments of the present invention, the heating rate of the first-stage calcination is 10 °C / min to 15 °C / min; and / or, the heating rate of the second-stage calcination is 5 °C / min to 10 °C / min; and / or, the heating rate of the third-stage calcination is 5 °C / min to 10 °C / min.

[0014] In some embodiments of the present invention, the first alcohol solvent is selected from anhydrous ethanol.

[0015] In some embodiments of the present invention, the first protective atmosphere is selected from one of an argon atmosphere and a nitrogen atmosphere.

[0016] In some embodiments of the present invention, the second protective atmosphere is selected from one of an argon atmosphere and a nitrogen atmosphere.

[0017] In some embodiments of the present invention, the degree of vacuum of the vacuum condition is 2e -3 ~5e -4 Pa.

[0018] In some embodiments of the present invention, the calcined product is placed in the first alcohol solvent and subjected to first ultrasonic vibration and / or first mechanical stirring to remove elemental sodium metal.

[0019] In some embodiments of the present invention, the time of the first ultrasonic vibration is 0.5 h to 1 h, and the frequency is 40 kHz to 50 kHz.

[0020] In some embodiments of the present invention, the time of the first mechanical stirring is 0.5 h to 1 h, and the rotation speed is 300 rpm to 400 rpm.

[0021] In some embodiments of the present invention, the first drying temperature is 60 °C to 80 °C, and the first drying time is 3 h to 5 h.

[0022] In a second aspect of the present invention, there is provided a functionalized boronene-graphene composite powder, which is prepared by the preparation method described in the first aspect; the microstructure of the functionalized boronene-graphene composite powder includes two-dimensional nanosheet-structured graphene and boronene coated on its surface, and the surface of the boronene is rich in hydroxyl functional groups.

[0023] The third aspect of the present invention provides a method for preparing a titanium-based composite powder, and the preparation method includes: using the functionalized borophene-graphene composite powder prepared by the preparation method described in the first aspect or the functionalized borophene-graphene composite powder described in the second aspect, and titanium powder as raw material powders; independently dissolving the functionalized borophene-graphene composite powder and the titanium powder in a secondary alcohol solvent, and independently performing secondary ultrasonic vibration and / or secondary mechanical stirring on each to obtain a functionalized borophene-graphene composite powder slurry and a titanium powder slurry; mixing the functionalized borophene-graphene composite powder slurry with the titanium powder slurry, performing tertiary ultrasonic vibration and / or tertiary mechanical stirring, and then performing secondary filtration and secondary drying to obtain the titanium-based composite powder.

[0024] In some embodiments of the present invention, the secondary alcohol solvent is selected from ethanol.

[0025] In some embodiments of the present invention, the temperature of the secondary drying is 60°C to 80°C, and the time of the secondary drying is 3h to 5h.

[0026] The fourth aspect of the present invention provides a titanium-based composite powder, and the titanium-based composite powder is prepared by the preparation method described in the third aspect; the microstructure of the titanium-based composite powder includes titanium powder and the functionalized borophene-graphene composite powder adsorbed on its surface.

[0027] In some embodiments of the present invention, based on the mass of the titanium-based composite powder, the mass percentage of the functionalized borophene-graphene composite powder is 0.5wt% to 3wt%.

[0028] In the present invention, by depositing boron on the surface of graphene and performing functionalization treatment, oxygen-containing functional groups can be indirectly added to the powder surface without destroying the lattice structure of graphene. This process avoids the destructive effects of high-energy ball milling and chemical modification on graphene, effectively improves the dispersion ability of the powder in aqueous solution while maintaining the integrity of the graphene lattice, and enhances its dispersibility.

[0029] In the present invention, borophene is deposited on the surface of graphene sheets, and by modifying borophene, while ensuring the complete crystal structure of graphene, the dispersibility of the overall powder in aqueous solution is improved, thereby increasing the dispersion degree of graphene on the surface of titanium powder. Description of the Drawings

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the boronene-modified graphene composite powder obtained after heating and calcination in the embodiment of the present invention; wherein, B represents boron element, and C represents carbon element.

[0032] Figure 2 It is a morphology diagram of graphene powder.

[0033] Figure 3 It is a morphology diagram of sodium borohydride powder.

[0034] Figure 4 It is a morphology diagram of the functionalized boronene-graphene composite powder prepared in the embodiment of the present invention.

[0035] Figure 5 It is a schematic structural diagram of the functionalized boronene-graphene composite powder prepared in the embodiment of the present invention; wherein, B represents boron element, C represents carbon element, and OH represents hydroxyl group.

[0036] Figure 6 It is a scanning electron microscope image of the titanium-based composite powder prepared in Example 1 of the present invention.

[0037] Figure 7 It is a scanning electron microscope image of the titanium-based composite powder prepared in Example 2 of the present invention.

[0038] Figure 8 It is a scanning electron microscope image of the titanium-based composite powder prepared in Example 3 of the present invention.

[0039] Figure 9 It is a scanning electron microscope image of the titanium-based composite powder prepared in Comparative Example 1 of the present invention.

[0040] Figure 10 It is a scanning electron microscope image of the titanium-based composite powder prepared in Comparative Example 2 of the present invention.

[0041] Figure 11 It is a scanning electron microscope image of the titanium-based composite powder prepared in Comparative Example 3 of the present invention. Specific Embodiments

[0042] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0043] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0044] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0045] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of the present invention, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0048] In order to retain the complete lattice structure of graphene and promote its uniform distribution on the surface of titanium powder, the present invention first provides a method for preparing functionalized borophene-graphene composite powder.

[0049] The preparation of the functionalized borophene-graphene composite powder in the present invention is specifically carried out according to the following steps.

[0050] Raw material powder

[0051] In the embodiments of the present invention, graphene and sodium borohydride are used as raw material powders. For example, the original graphene powder prepared by a physical method and analytical pure sodium borohydride are used as raw material powders.

[0052] In the embodiments of the present invention, graphene and sodium borohydride are weighed according to the target ratio and mixed evenly under a first protective atmosphere to obtain a mixed powder.

[0053] In some embodiments of the present invention, the mass ratio of graphene to sodium borohydride is 1:(1-4). The mass ratio of graphene to sodium borohydride provided by the present invention can be any value within the range formed by any two values within the above range. For example, it can be 1:(1-2), or it can be 1:(2-4), and so on. Exemplarily, the mass ratio of graphene to sodium borohydride can also be one of 1:1, 1:2, 1:3, 1:4 or any value satisfying the above range.

[0054] In some embodiments of the present invention, the first protective atmosphere can be one of an argon atmosphere and a nitrogen atmosphere. For example, the mixing of raw material powders is carried out under an argon environment.

[0055] In the embodiments of the present invention, the mixed powder can be placed inside a firing boat under a protective atmosphere according to the actual situation, and then the firing boat is placed in a vacuum bag and sealed to prevent sodium borohydride from oxidizing and deliquescing in the air.

[0056] Heating and calcining

[0057] In the embodiments of the present invention, under a second protective atmosphere or in a vacuum condition, the mixed powder is subjected to segmented heating and calcination to modify graphene, and the calcined product is obtained by furnace cooling. Among them, Figure 1 shows a schematic structural diagram of the borophene-modified graphene composite powder obtained after the calcination of graphene and sodium borohydride. After impurity removal and dispersion in an alcohol solution, functional groups are introduced to obtain a functionalized borophene-graphene composite powder.

[0058] In some embodiments of the present invention, the mixed powder is placed in a firing boat, and a tube furnace is used to carry out segmented heating and calcination on it under a second protective atmosphere to modify graphene.

[0059] In some embodiments of the present invention, the second protective atmosphere can be an argon atmosphere or a nitrogen atmosphere. For example, heating and calcination are carried out in an argon atmosphere.

[0060] In some embodiments of the present invention, the degree of vacuum in the vacuum condition can be 2e -3 ~5e -4 Pa.

[0061] In some embodiments of the present invention, three-stage heating and calcination are adopted, wherein the first-stage calcination temperature is 460°C to 490°C, the second-stage calcination temperature is 530°C to 550°C, and the third-stage calcination temperature is 600°C to 650°C. Exemplarily, the first-stage calcination temperature can be one of 460°C, 465°C, 470°C, 475°C, 480°C, 485°C, 490°C or any value satisfying the above range. The second-stage calcination temperature can be one of 530°C, 535°C, 540°C, 545°C, 550°C or any value satisfying the above range. The third-stage calcination temperature can be one of 600°C, 605°C, 610°C, 615°C, 620°C, 625°C, 630°C, 635°C, 640°C, 645°C, 650°C or any value satisfying the above range.

[0062] In some embodiments of the present invention, the first-stage calcination time is 2 h to 2.5 h. Exemplarily, the first-stage calcination time can be one of 2 h, 2.1 h, 2.2 h, 2.3 h, 2.4 h, 2.5 h or any value satisfying the above range.

[0063] In some embodiments of the present invention, the second-stage calcination time is 0.5 h to 1 h. Exemplarily, the second-stage calcination time can be one of 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h or any value satisfying the above range.

[0064] In some embodiments of the present invention, the third-stage calcination time is 0.5 h to 1 h. Exemplarily, the third-stage calcination time can be one of 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h or any value satisfying the above range.

[0065] In some embodiments of the present invention, the heating rate of the first-stage calcination is 10°C / min to 15°C / min. Exemplarily, the heating rate of the first-stage calcination can be one of 10°C / min, 11°C / min, 12°C / min, 13°C / min, 14°C / min, 15°C / min or any value satisfying the above range.

[0066] In some embodiments of the present invention, the heating rate of the second-stage calcination is 5°C / min to 10°C / min. Exemplarily, the heating rate of the second-stage calcination can be one of 5°C / min, 6°C / min, 7°C / min, 8°C / min, 9°C / min, 10°C / min or any value satisfying the above range.

[0067] In some embodiments of the present invention, the heating rate of the third-stage calcination is 5°C / min to 10°C / min. Exemplarily, the heating rate of the third-stage calcination can be one of 5°C / min, 6°C / min, 7°C / min, 8°C / min, 9°C / min, 10°C / min or any value satisfying the above range.

[0068] In the embodiments of the present invention, first, it is heated to 460°C to 490°C at a heating rate of 10°C / min to 15°C / min and held at this temperature for 2 h to 2.5 h for the first-stage calcination; secondly, it is heated to 530°C to 550°C at a heating rate of 5°C / min to 10°C / min and held at this temperature for 0.5 h to 1 h for the second-stage calcination; finally, it is heated to 600°C to 650°C at a heating rate of 5°C / min to 10°C / min and held at this temperature for 0.5 h to 1 h for the third-stage calcination. After the heat preservation ends, the calcined product is naturally cooled to room temperature with the furnace.

[0069] It is worth mentioning that room temperature refers to a state where the temperature is 20°C to 30°C without active heating and cooling.

[0070] Removing sodium metal

[0071] In the embodiments of the present invention, the obtained calcined product is placed in a first alcohol solvent to remove sodium metal. At the same time, in this process, due to the electron-deficient characteristic of boron itself, the hydroxyl functional group in the first alcohol solvent can also open the energy band of boron element and combine with borophene to improve the dispersion ability of the whole powder in aqueous solution. At the same time, it lays a foundation for the subsequent wet mixing to prepare titanium-based composite powder.

[0072] In some embodiments of the present invention, the first alcohol solvent is selected from anhydrous ethanol.

[0073] In some embodiments of the present invention, in order to improve the removal effect of sodium and achieve the effect of preliminary dispersion, according to actual needs, the calcined product can be placed in the first alcohol solvent and subjected to the first ultrasonic vibration and / or the first mechanical stirring.

[0074] In some embodiments of the present invention, the first ultrasonic vibration time is 0.5h to 1h. For example, the first ultrasonic vibration time can be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range.

[0075] In some embodiments of the present invention, the frequency of the first ultrasonic vibration is 40kHz to 50kHz. For example, the frequency of the first ultrasonic vibration can be one of 40kHz, 41kHz, 42kHz, 43kHz, 44kHz, 45kHz, 46kHz, 47kHz, 48kHz, 49kHz, 50kHz or any value that meets the above range.

[0076] In some embodiments of the present invention, the first mechanical stirring time is 0.5h to 1h, and the rotation speed is 300rpm to 400rpm. Exemplarily, the first mechanical stirring time can be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range value. The rotation speed of the first mechanical stirring can be one of 300rpm, 310rpm, 320rpm, 330rpm, 340rpm, 350rpm, 360rpm, 370rpm, 380rpm, 390rpm, 400rpm or any value satisfying the above range value.

[0077] In some embodiments of the present invention, the calcined product obtained after calcination is placed in an anhydrous ethanol solution, and treated by a first ultrasonic vibration and a first mechanical stirring method for 0.5h to 1h, respectively, to remove the sodium element in the material and disperse the borophene-graphene powder. At the same time, in this process, due to the electron-deficient characteristics of boron itself, the hydroxyl functional group in the anhydrous ethanol can also open the boron element energy band, combine with borophene, and improve the overall dispersion ability of the powder in the aqueous solution.

[0078] In some embodiments of the present invention, a Branson 450D disperser with a frequency of 40kHz to 50kHz is used for the first ultrasonic vibration treatment, and an IKARW20 mechanical stirrer with a rotation speed of 300rpm to 400rpm is used for continuous stirring for 30min to 60min to remove the sodium element in the material and disperse the boron olefin-graphene powder.

[0079] Filtration and drying

[0080] In an embodiment of the present invention, a composite powder slurry obtained by dissolving the calcined product in anhydrous ethanol is subjected to a first filtration and a first drying treatment to obtain a functionalized borophene-graphene composite powder.

[0081] In some embodiments of the present invention, the temperature of the first drying is 60°C to 80°C, and the time of the first drying is 3h to 5h. Exemplarily, the temperature of the first drying can be one of 60°C, 65°C, 70°C, 75°C, 80°C or any value satisfying the above range. The time of the first drying can be one of 3h, 4h, 5h or any value satisfying the above range.

[0082] In some embodiments of the present invention, a vacuum drying oven is used for the first drying treatment, and drying is carried out at 60°C to 80°C for 3h to 5h to obtain a functionalized borophene-graphene composite powder.

[0083] The present invention also provides a functionalized borophene-graphene composite powder, which is prepared by the above preparation method. Refer to Figure 4 and Figure 5 As shown, the microstructure of the functionalized borophene-graphene composite powder includes two-dimensional nanosheet-structured graphene and borophene coated on its surface, and the surface of the borophene is rich in hydroxyl functional groups.

[0084] The present invention also provides a preparation method of a titanium-based composite powder. The key of this preparation method is to use the above-mentioned functionalized borophene-graphene composite powder and titanium powder as raw material powders. The functionalized borophene-graphene composite powder and titanium powder are dispersed in an ethanol solution. The ethanol solution is used to attach oxygen-containing functional groups such as hydroxyl groups to the surface of the borophene, promote its functionalization, and improve its hydrophilicity. And because ethanol can wet both the surface of the borophene and titanium particles, an ethanol thin layer is formed between graphene-borophene-titanium. The surface tension of the liquid thin layer makes the functionalized borophene-graphene composite powder adsorb on the surface of the titanium particles, realizing the coating effect of the functionalized borophene-graphene on the surface of the titanium powder.

[0085] The preparation method of the titanium-based composite powder in the present invention is specifically carried out according to the following steps.

[0086] Prepare a functionalized borophene-graphene composite powder slurry

[0087] In the embodiments of the present invention, the functionalized borophene-graphene composite powder is dissolved in a second alcohol solvent, and second ultrasonic vibration and / or second mechanical stirring are carried out to obtain a functionalized borophene-graphene composite powder slurry.

[0088] In the embodiments of the present invention, the functionalized borophene-graphene composite powder is placed in an alcohol solvent, such as an ethanol solution, to improve the overall hydrophilicity of the powder, and thus lay a foundation for subsequent adsorption on the surface of the titanium powder to improve its lattice integrity.

[0089] In some embodiments of the present invention, the second alcohol solvent is selected from ethanol.

[0090] In some embodiments of the present invention, the ultrasonic vibration treatment time of the functionalized borophene-graphene composite powder can be 0.5h to 1h. Exemplarily, the ultrasonic vibration time of the functionalized borophene-graphene composite powder can be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range.

[0091] In some embodiments of the present invention, the mechanical stirring time of the functionalized borophene-graphene composite powder may be 0.5h to 1h. Exemplarily, the mechanical stirring time of the functionalized borophene-graphene composite powder may be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range.

[0092] Titanium powder slurry

[0093] In an embodiment of the present invention, titanium powder is dissolved in a second alcohol solvent, and subjected to a second ultrasonic vibration and / or a second mechanical stirring to obtain a titanium powder slurry.

[0094] In some embodiments of the present invention, the second alcohol solvent is selected from ethanol.

[0095] In some embodiments of the present invention, the ultrasonic vibration treatment time of titanium powder can be 0.5h to 1h. For example, the ultrasonic vibration treatment time of titanium powder can be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range.

[0096] In some embodiments of the present invention, the mechanical stirring time of the titanium powder can be 0.5h to 1h. For example, the mechanical stirring time of the titanium powder can be one of 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value satisfying the above range.

[0097] Mixed slurry

[0098] In an embodiment of the present invention, the functionalized borophene-graphene composite powder slurry is mixed with the titanium powder slurry, and subjected to a third ultrasonic vibration and / or a third mechanical stirring to fully mix the mixture to obtain a mixed slurry.

[0099] In some embodiments of the present invention, the functionalized borophene-graphene composite powder slurry is mixed with the titanium powder slurry, followed by a third ultrasonic vibration for 0.5 h to 1 h and a third mechanical stirring for 0.5 h to 1 h to promote the adsorption of graphene on the surface of the titanium powder. Exemplarily, the third ultrasonic vibration time can be one of 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h or any value within the above range. The third mechanical stirring time can be one of 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h or any value within the above range.

[0100] In some embodiments of the present invention, a Branson 450D disperser is used with a frequency of 40 kHz to 50 kHz for 30 min to 60 min, and at the same time, it is combined with an IKA RW20 mechanical stirrer with a rotation speed of 300 rpm to 400 rpm for 30 min to 60 min.

[0101] In some embodiments of the present invention, first, the functionalized borophene-graphene composite powder and the titanium powder are independently dispersed into an ethanol solution according to the required weight ratio, and each is independently subjected to ultrasonic vibration treatment for 0.5 h to 1 h and mechanical stirring for 0.5 h to 1 h; then the two obtained slurries are mixed together, and after mixing, they are again subjected to ultrasonic vibration for 0.5 h to 1 h and mechanical stirring for 0.5 h to 1 h to promote the adsorption of graphene on the surface of the titanium powder.

[0102] Filtration and drying

[0103] In an embodiment of the present invention, the mixed slurry is subjected to a second filtration and a second drying to obtain a titanium-based composite powder.

[0104] In some embodiments of the present invention, the temperature of the second drying is 60 °C to 80 °C, and the time of the second drying is 3 h to 5 h. Exemplarily, the temperature of the second drying can be one of 60 °C, 65 °C, 70 °C, 75 °C, 80 °C or any value within the above range. The time of the second drying can be one of 3 h, 4 h, 5 h or any value within the above range.

[0105] In some embodiments of the present invention, the second drying is carried out in a vacuum drying oven at 60 °C to 80 °C for 3 h to 5 h to obtain a titanium-based composite powder.

[0106] The present invention also provides a titanium-based composite powder, which is prepared by using the above-mentioned preparation method of the titanium-based composite powder; the microstructure of the titanium-based composite powder includes titanium powder and the functionalized borophene-graphene composite powder adsorbed on its surface.

[0107] In an embodiment of the present invention, based on the mass of the titanium-based composite powder, the mass percentage of the functionalized borophene-graphene composite powder is 0.5 wt% to 3 wt%. Exemplarily, the mass percentage of the functionalized borophene-graphene composite powder can be one of 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.2 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.4 wt%, 2.5 wt%, 2.6 wt%, 2.8 wt%, 3 wt% or any value satisfying the above range values.

[0108] By constructing the functionalized borophene-graphene composite powder, the present invention improves the dispersion ability of graphene in water, while avoiding the destruction of the structure of graphene itself and retaining the complete graphene lattice structure.

[0109] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. The experimental reagents used in the following embodiments are all conventional biochemical reagents unless otherwise specified; the raw materials, instruments, and equipment used in the following embodiments can all be obtained through market purchase or by existing methods; the dosages of the experimental reagents are the dosages of the reagents in conventional experimental operations unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified.

[0110] Example 1

[0111] Preparation of functionalized borophene-graphene composite powder:

[0112] Under an argon atmosphere, weigh Figure 3 4.5 g of sodium borohydride as shown and Figure 2 1.4 g of graphene as shown, put them into a mixing bottle and mix evenly, so that the whole mixed powder presents a grayish-white powder particle appearance, avoiding the situation of more black graphene or white sodium borohydride aggregation in the powder. After mixing evenly, put it into a boat. Because there is a lot of sample powder, the powder is divided into two parts to avoid uneven heating during the sintering process.

[0113] Adjust the heating program of the tube furnace and carry out segmented heating and calcination under an argon atmosphere. The heating rate in the first stage is set to 10 °C / min, and it is heated to 490 °C and held for 2 h; the heating rate in the second stage is set to 5 °C / min, and it is heated to 550 °C and held for 0.5 h; the heating rate in the third stage is set to 5 °C / min, and it is heated to 600 °C and held for 0.5 h. After the heating and calcination are completed, cool it with the furnace. The whole process is under an argon protection environment to avoid oxidation.

[0114] Take out the calcined product after calcination and place it in an ethanol solution to remove sodium metal in the product material and deposit oxygen-containing functional groups on the surface of borophene. After the treatment, perform the first filtration on the composite powder slurry and dry it at 60 °C for 3 h to obtain the functionalized borophene-graphene composite powder.

[0115] Preparation of titanium-based composite powder:

[0116] The titanium-based composite powder, namely the functionalized borophene-graphene-titanium composite powder. Based on the mass of the functionalized borophene-graphene-titanium composite powder, the weight percentage of the functionalized borophene-graphene composite powder is 0.5 wt%, and at this time, the enhancement ratio of the titanium-based composite powder is denoted as 0.5 wt%. According to the above ratio, take 1.0 g of the borophene-graphene composite powder and the corresponding titanium powder, and place the two powders independently in an ethanol solution, and simultaneously independently use the second ultrasonic vibration for 45 min combined with the second mechanical stirring for 45 min to make them independently dispersed evenly, obtaining the functionalized borophene-graphene composite powder slurry and the titanium powder slurry.

[0117] Mix the functionalized borophene-graphene composite powder slurry and the titanium powder slurry, and use an ultrasonic vibrator to treat for 40 min and the third mechanical stirring for 30 min to make graphene uniformly adsorbed on the surface of the titanium powder. Subsequently, perform the second filtration on the mixed slurry and dry it at 60 °C for 3 h to obtain the titanium-based composite powder with an enhancement ratio of 0.5 wt%.

[0118] The morphology of the titanium-based composite powder with an enhancement ratio of 0.5 wt% prepared in Example 1 is as Figure 6 shown. Its microstructure includes titanium powder and the functionalized borophene-graphene composite powder adsorbed on its surface. It can also be seen from this the powdering effect of the functionalized borophene-graphene composite powder with a weight percentage of 0.5 wt%. Since the content of graphene powder is small, there are monolayer / few-layer flaky graphene tissues on the surface of some titanium powders, and the powdering and adhering effect is good. The graphene sheets are tightly combined with the titanium powder and there are few voids. And the graphene sheets are relatively evenly distributed on the titanium powder, and there is basically no agglomeration between the graphene sheets, showing a good dispersion state.

[0119] Example 2

[0120] Preparation of functionalized borophene-graphene composite powder:

[0121] Under an argon atmosphere, weigh Figure 3 as shown 0.5 g of sodium borohydride and Figure 2 as shown 0.2 g of graphene, put them into a mixing bottle and mix evenly, so that the whole mixed powder presents a grayish-white powder particle appearance, avoiding the situation of more black graphene or white sodium borohydride aggregation in the powder. After mixing evenly, put it into a firing boat.

[0122] Adjust the heating program of the tubular furnace, and perform segmented heating and calcination in an argon environment. The first segment is set to a heating rate of 10°C / min, heated to 490°C and kept warm for 2 hours; the second segment is set to a heating rate of 5°C / min, heated to 550°C and kept warm for 0.5h; the third segment is set to a heating rate of 5°C / min, heated to 600°C and kept warm for 0.5h. After the heating and calcination is completed, the furnace is cooled, and the entire process is in an argon protection environment to avoid oxidation.

[0123] The calcined product was taken out and placed in an ethanol solution, and subjected to a first ultrasonic vibration for 0.5 h to remove the sodium metal element in the product material, and to plate oxygen-containing functional groups on the surface of the borophene. After the treatment, the composite powder slurry was first filtered and dried at 60° C. for 3 h to obtain a functionalized borophene-graphene composite powder.

[0124] Preparation of titanium-based composite powder:

[0125] According to the reinforcement ratio of the titanium-based composite powder of 1.5wt%, 0.3g of functionalized borophene-graphene composite powder and the corresponding titanium powder were weighed, and the two powders were independently placed in an ethanol solution, and at the same time, they were independently subjected to a second ultrasonic vibration for 45min combined with a second mechanical stirring for 45min to make them independently dispersed evenly, to obtain a functionalized borophene-graphene composite powder slurry and a titanium powder slurry.

[0126] The functionalized borane-graphene composite powder slurry was mixed with the titanium powder slurry, treated with an ultrasonic vibrator for 40 minutes, and mechanically stirred for 30 minutes to make the graphene uniformly adsorbed on the surface of the titanium powder. The mixed slurry was then filtered for a second time and dried at 60° C. for 3 hours to obtain a titanium-based composite powder with an enhancement ratio of 1.5wt%.

[0127] The morphology of the titanium-based composite powder with a reinforcement ratio of 1.5 wt% prepared in Example 2 is as follows: Figure 7 As shown, its microstructure includes titanium powder and functionalized borane-graphene composite powder adsorbed on its surface. When the content of functionalized borane-graphene composite powder increases to 1.5wt%, it can be seen that the graphene sheets have a good adhesion effect on the titanium powder surface and have a high powder loading situation. In addition, the amount of graphene on the surface of spherical titanium powder increases significantly, and the overall shape is still single-layer / few-layer flaky graphene, and there is more than one graphene sheet powder distributed on the surface of titanium powder particles. With the increase of the enhancement ratio, the content of large-sized graphene sheets increases relatively, and the degree of bonding with titanium powder is better, and it is tightly attached to the surface of titanium powder with very few gaps.

[0128] Example 3

[0129] Preparation of functionalized borophene-graphene composite powder:

[0130] Under argon atmosphere, weigh Figure 3 As shown in 4.6g sodium borohydride and Figure 2 1.6 g of graphene as shown is put into a mixing bottle and mixed evenly so that the mixed powder as a whole presents an appearance of grayish white powder particles to avoid the aggregation of too much black graphene or white sodium borohydride in the powder. After mixing evenly, it is put into a flask.

[0131] Adjust the heating program of the tubular furnace, and perform segmented heating and calcination in an argon environment. The first segment is set to a heating rate of 10°C / min, heated to 490°C and kept warm for 2 hours; the second segment is set to a heating rate of 5°C / min, heated to 550°C and kept warm for 0.5 hours; the third segment is set to a heating rate of 5°C / min, heated to 600°C and kept warm for 0.5 hours. After the heating and calcination is completed, the furnace is cooled, and the entire process is in an argon protection environment to avoid oxidation.

[0132] The calcined product after calcination is taken out and placed in an ethanol solution, and subjected to a first ultrasonic vibration for 0.5 h combined with a first mechanical stirring for 0.5 h to remove the sodium metal element in the product material, and to plate oxygen-containing functional groups on the surface of borophene. After the treatment is completed, the composite powder slurry is first filtered and dried at 60° C. for 3 h to obtain a functionalized borophene-graphene composite powder.

[0133] Preparation of titanium-based composite powder:

[0134] According to the reinforcement ratio of the titanium-based composite powder of 3.0wt%, 2.7g of functionalized borophene-graphene composite powder and corresponding titanium powder were weighed, and the two powders were independently placed in an ethanol solution, and at the same time, they were independently subjected to a second ultrasonic vibration for 45min combined with a second mechanical stirring for 45min to make them independently dispersed evenly, to obtain functionalized borophene-graphene composite powder slurry and titanium powder slurry.

[0135] The functionalized borane-graphene composite powder slurry was mixed with the titanium powder slurry, treated with an ultrasonic vibrator for 40 minutes, and mechanically stirred for 30 minutes to make the graphene evenly attached to the surface of the titanium powder. The mixed slurry was then filtered for a second time and dried at 60° C. for 3 hours to obtain a titanium-based composite powder with an enhancement ratio of 3wt%.

[0136] The morphology of the titanium-based composite powder with a reinforcement ratio of 3 wt% prepared in Example 3 is as follows: Figure 8As shown, its microstructure includes titanium powder and functionalized borophene-graphene composite powder adsorbed on its surface. When the content of the functionalized borophene-graphene composite powder increases to 3 wt%, it can be clearly seen that the number of graphene increases, and more graphene sheets are adsorbed on the surface of the titanium powder particles. Compared with the cases where the content of the functionalized borophene-graphene composite powder is 0.5 wt% and 1.5 wt%, at 3 wt%, there is a situation where some large-size graphene sheets aggregate on the surface of the titanium powder, forming a relatively thick sheet aggregation layer.

[0137] Comparative Example 1

[0138] Preparation of titanium-based composite powder:

[0139] For the titanium-based composite powder in Comparative Example 1, that is, the graphene-titanium powder composite powder, calculated according to the weight percentage of the graphene powder being 0.5 wt%, 0.05 g was weighed. Figure 2 As shown in the original graphene powder, 9.95 g of titanium powder. The two powders were independently placed in an ethanol solution with the same concentration as in Example 1, and at the same time, they were independently dispersed evenly by ultrasonic vibration for 30 min combined with mechanical stirring for 30 min to obtain a graphene powder slurry and a titanium powder slurry.

[0140] The graphene powder slurry and the titanium powder slurry were mixed and treated with an ultrasonic vibrator for 40 min and mechanically stirred for 30 min. Subsequently, the mixed slurry was filtered and dried at 60 °C for 3 h to obtain a titanium-based composite powder with the same enhancement ratio of 0.5 wt% as in Example 1, so as to compare the improvement of the boronated graphene in powdering.

[0141] The morphology of the titanium-based composite powder with an enhancement ratio of 0.5 wt% prepared in Comparative Example 1 is as Figure 9 shown. It can also be seen from this the specific powdering situation of the graphene powder with a weight percentage of 0.5 wt%. The graphene sheets agglomerate into larger graphite sheets, and the aggregation effect is more obvious. And the powdering and adhesion effects of graphene on the surface of the titanium powder are extremely poor. Compared with the borophene-graphene composite powder at a ratio of 0.5 wt%, the dispersion effect of graphene and the adhesion effect on the surface of the titanium powder are greatly reduced.

[0142] Comparative Example 2

[0143] Preparation of titanium-based composite powder:

[0144] For the titanium-based composite powder in Comparative Example 2, that is, the graphene-titanium powder composite powder, calculated according to the weight percentage of the graphene powder being 1.5 wt%, 0.15 g was weighed. Figure 2The original graphene powder shown, 9.85 g of titanium powder, were each independently placed in an ethanol solution at the same concentration as in Example 2, and each was independently subjected to ultrasonic vibration for 30 min combined with mechanical stirring for 30 min to be independently dispersed evenly, obtaining a graphene powder slurry and a titanium powder slurry.

[0145] The graphene powder slurry and the titanium powder slurry were mixed and treated with an ultrasonic vibrator for 40 min and mechanically stirred for 30 min. Subsequently, the mixed slurry was filtered and dried at 60 °C for 3 h to obtain a titanium-based composite powder with the same enhancement ratio of 1.5 wt% as in Example 2, for comparing the improvement in powder application of boron-coated graphene.

[0146] The morphology of the titanium-based composite powder with an enhancement ratio of 1.5 wt% prepared in Comparative Example 2 is as Figure 10 shown. It can also be seen from this the specific powder application situation of the graphene powder with a weight percentage of 1.5 wt%. When the graphene content was increased to 1.5 wt%, through scanning electron microscopy characterization and analysis, it was found that the graphene nanosheets still showed significant in-plane aggregation, and its two-dimensional nanostructure was not effectively dissociated. At the same time, a good adhesion effect could not be formed between the graphene and the titanium powder, and the graphene powder showed significant agglomeration.

[0147] Comparative Example 3

[0148] Preparation of titanium-based composite powder:

[0149] For the titanium-based composite powder in Comparative Example 3, that is, the graphene-titanium powder composite powder, calculated by the weight percentage of the graphene powder being 3.0 wt%, 0.3 g of the original graphene powder and 9.7 g of titanium powder were weighed. The two powders were each independently placed in an ethanol solution at the same concentration as in Example 3, and each was independently subjected to ultrasonic vibration for 30 min combined with mechanical stirring for 30 min to be independently dispersed evenly, obtaining a graphene powder slurry and a titanium powder slurry.

[0150] The graphene powder slurry and the titanium powder slurry were mixed and treated with an ultrasonic vibrator for 40 min and mechanically stirred for 30 min. Subsequently, the mixed slurry was filtered and dried at 60 °C for 3 h to obtain a titanium-based composite powder with the same enhancement ratio of 3.0 wt% as in Example 3, for comparing the improvement in powder application of boron-coated graphene.

[0151] The morphology of the titanium-based composite powder with an enhancement ratio of 3.0 wt% prepared in Comparative Example 3 is as Figure 11As shown, it can also be seen the specific powdering situation of graphene powder with a weight percentage of 3.0 wt%. When the graphene content is increased to 3.0 wt%, through scanning electron microscope characterization and analysis, it is found that the graphene nanosheets show a more significant aggregation phenomenon, and its two-dimensional nanostructure has not been effectively dissociated. And with the increase of the powder content, the agglomeration situation between graphene becomes more serious, the adsorption effect with titanium powder decreases, and the separation effect between graphene and titanium powder becomes more obvious.

[0152] Combined with Figure 8 and Figure 11 it can be seen that in Example 3, although the aggregation effect increases with the increase of the graphene content, its overall dispersion effect has been significantly improved compared with the original graphene under the same enhancement ratio. The agglomeration phenomenon and the lamellar thickness are significantly reduced, and the powdering effect and the adhesion situation have been greatly improved. For the crystal structure of graphene, through the comparative analysis of the sizes of the modified graphene and the original graphene, it is found that the size of the modified graphene has not changed significantly, and its lateral size still remains in the range of 10 μm to 50 μm, which is equivalent to that of the original graphene. In addition, the morphology analysis shows that the modified graphene has changed from a multi-layer structure to a single-layer structure, which further confirms the effectiveness of the present invention in improving the dispersion of graphene and maintaining the integrity of its lattice structure.

[0153] Comparative Example 4

[0154] In the prior art, the rotating electrode method and the hydrothermal reduction method are used to coat soluble nanoborides on the surface of graphene oxide, and the graphene oxide is modified by the hydrothermal reduction of the soluble boride on the surface of graphene oxide to obtain boride-modified graphene oxide, which weakens the large van der Waals force existing between the graphene sheets. Subsequently, the ball milling dispersion process is used to promote the dispersion effect of the modified graphene on the surface of titanium powder.

[0155] In Comparative Example 4, although the destruction of the graphene structure is reduced by the operation of reducing the boride, the selected graphene oxide and the subsequent ball milling dispersion process will still cause great damage to the graphene structure and scale, and it is impossible to ensure the lattice structure of graphene after powdering.

[0156] In the present invention, the mixed powder after mixing graphene and sodium borohydride is placed in a protective gas environment and subjected to segmented heating and calcination to promote the in-situ self-decomposition of sodium borohydride in the mixed powder. Using the sp of boron element 2The electron-deficient property of the orbit forms an electron-deficient p-Π conjugated bond with the large Π bond in graphene, constructing a functionalized borophene-graphene composite heterogeneous powder. Subsequently, the functionalized borophene-graphene composite powder is dispersed in an ethanol solution. The ethanol solution attaches oxygen-containing functional groups such as hydroxyl groups to the surface of borophene, promoting its functionalization and enhancing its hydrophilicity. Titanium powder is dispersed in the ethanol solution, and the ethanol solution of the functionalized borophene-graphene composite powder is mixed with the ethanol solution of titanium powder. Since absolute ethanol can wet both the surface of borophene and titanium particles, an absolute ethanol thin layer is formed between graphene-borophene-titanium. The surface tension of the liquid thin layer causes the composite powder to adsorb on the surface of titanium particles, achieving the coating effect of borophene-graphene on the surface of titanium powder.

[0157] In the present invention, by constructing the functionalized borophene-graphene composite powder, the dispersion ability of graphene in water is improved, while the destruction of the graphene's own structure is avoided, and the complete graphene lattice structure is retained.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a functionalized borophene-graphene composite powder, characterized in that, The preparation method includes: Under a first protective atmosphere, graphene and sodium borohydride are uniformly mixed to obtain a mixed powder; The mixed powder is subjected to segmented heating and calcination under a second protective atmosphere or in a vacuum condition, and the obtained calcined product is placed in a first alcohol solvent to remove elemental sodium metal. After that, through first filtration and first drying, the functionalized borophene-graphene composite powder is prepared.

2. The preparation method of the functionalized borophene-graphene composite powder according to claim 1, characterized in that, The mass ratio of the graphene to the sodium borohydride is 1:(1 - 4); preferably 1:(2 - 4).

3. The preparation method of the functionalized borophene-graphene composite powder according to claim 1, characterized in that, Three-stage heating and calcination are adopted, wherein the first-stage calcination temperature is 460°C - 490°C, the second-stage calcination temperature is 530°C - 550°C, and the third-stage calcination temperature is 600°C - 650°C.

4. The preparation method of the functionalized borophene-graphene composite powder according to claim 3, characterized in that, The first-stage calcination time is 2h - 2.5h, the second-stage calcination time is 0.5h - 1h, and the third-stage calcination time is 0.5h - 1h; Preferably, the heating rate of the first-stage calcination is 10°C / min - 15°C / min; and / or, the heating rate of the second-stage calcination is 5°C / min - 10°C / min; and / or, the heating rate of the third-stage calcination is 5°C / min - 10°C / min.

5. The preparation method of the functionalized borophene-graphene composite powder according to claim 1, characterized in that, The first alcohol solvent is selected from absolute ethanol; Preferably, the first protective atmosphere is selected from one of an argon atmosphere and a nitrogen atmosphere; Preferably, the second protective atmosphere is selected from one of an argon atmosphere and a nitrogen atmosphere; Preferably, the degree of vacuum of the vacuum condition is 2e -3 ~5e -4 Pa.

6. The preparation method of the functionalized borophene-graphene composite powder according to claim 1, characterized in that, The calcined product is placed in a first alcohol solvent and subjected to first ultrasonic vibration and / or first mechanical stirring to remove elemental sodium metal.

7. The preparation method of the functionalized borophene-graphene composite powder according to claim 1, wherein, The first drying temperature is 60°C - 80°C, and the first drying time is 3h - 5h.

8. A functionalized borophene-graphene composite powder, characterized in that, It is prepared by using the preparation method described in any one of claims 1 - 7; The microstructure of the functionalized borophene-graphene composite powder includes two-dimensional nanosheet-structured graphene and borophene coated on its surface, and the surface of the borophene is rich in hydroxyl functional groups.

9. A method for preparing a titanium-based composite powder, characterized in that, The preparation method includes: The functionalized borophene-graphene composite powder prepared by using the preparation method described in any one of claims 1 - 7 or the functionalized borophene-graphene composite powder described in claim 8, and titanium powder are used as raw material powders; The functionalized borophene-graphene composite powder and the titanium powder are independently dissolved in a second alcohol solvent, and independently subjected to second ultrasonic vibration and / or second mechanical stirring to obtain a functionalized borophene-graphene composite powder slurry and a titanium powder slurry; The functionalized borophene-graphene composite powder slurry and the titanium powder slurry are mixed, subjected to third ultrasonic vibration and / or third mechanical stirring, and then through second filtration and second drying, a titanium-based composite powder is prepared. Preferably, the second alcohol solvent is selected from ethanol.

10. A titanium-based composite powder, characterized in that, It is prepared by using the preparation method described in claim 9; The microstructure of the titanium-based composite powder includes titanium powder and the functionalized borophene-graphene composite powder adsorbed on its surface; Preferably, based on the mass of the titanium-based composite powder, the mass percentage of the functionalized borophene-graphene composite powder is 0.5wt% - 3wt%.

Images