A method for preparing Ti2AlC material and its application

Abstract

This invention belongs to the field of ceramic matrix composite technology, and specifically relates to a method for preparing Ti2AlC material and its application. Pre-carbonization: TiC... 0.5 O 0.43 The powder is mixed with dextrin, compressed into tablets, and pre-carbonized at high temperature under an Ar atmosphere. TiC intermediate powder preparation: After high-temperature pre-carbonization, it is isolated and reduced with metallic Ca under Ar protection to obtain a reduction product. The reduction product is then acid-washed, washed, and dried to obtain TiC powder. Ti2AlC precursor mixing: TiC powder is mixed uniformly with Ti powder and Al powder to obtain a Ti2AlC reaction mixture. Molding and reaction sintering: After molding the Ti2AlC reaction mixture, it is hot-pressed or spark plasma sintered under vacuum or a high-purity Ar atmosphere to obtain Ti2AlC material. The core of this invention lies in the use of a "two-step" process: firstly, TiC is deoxidized with Ca and carbonized with dextrin under an Ar atmosphere. 0.5 O 0.43 The TiC intermediate powder was converted into TiC. Subsequently, Ti2AlC material was prepared by reaction sintering of TiC, Ti and Al, and the formation of secondary phases was suppressed by synergistic regulation of Al activity and carbon activity.

Description

Technical Field

[0001] This invention belongs to the field of ceramic matrix composite technology, and specifically relates to a method for preparing Ti2AlC material and its application. Background Technology

[0002] Ti2AlC is a typical 211-type MAX phase material, a layered compound that combines the properties of metals and ceramics. It has excellent electrical and thermal conductivity, thermal shock resistance, machinability, and high-temperature stability, and has broad application prospects in high-temperature structural components, conductive and wear-resistant components, and functional ceramics.

[0003] Currently, the main methods for preparing Ti2AlC materials include direct reaction sintering using Ti, Al, and C elemental powders, or hot pressing sintering or spark plasma sintering using TiC, Ti, and Al as raw materials. Among these, the TiC–Ti–Al route can improve the compositional uniformity and shorten the formation path of Ti2AlC to some extent compared to elemental powder systems. However, this system is quite sensitive to carbon and Al activities. If the proportions or heat treatment regime are not properly controlled, TiC residues and secondary phases such as TiAl and Ti3Al can easily be generated, thus affecting the phase purity and properties of the material.

[0004] On the other hand, TiC is often generated as a byproduct in the preparation or metallurgical process of some titanium-based materials. x O y Type II titanium carbon oxides (such as TiC) 0.5 O 0.43 Because these materials contain both oxygen and non-stoichiometric carbon, their structures are unstable and their properties are unclear. They are usually difficult to use directly as structural materials and are often regarded as low-value-added by-products or even waste, resulting in low resource utilization.

[0005] However, in terms of composition, TiC x O y The precursor already contains both Ti and C elements. If the oxygen can be removed and the carbon content adjusted through appropriate processes, it is possible to convert it into high-purity TiC powder, which can then be used as a reaction intermediate in the preparation of Ti2AlC. This would create a novel resource utilization route: "oxygen-containing titanium-carbon waste → TiC intermediate powder → Ti2AlC material". This approach not only has the potential to reduce the raw material costs in the Ti2AlC preparation process but also enables the high-value-added conversion of titanium-carbon-oxygen waste, resulting in significant economic and environmental benefits.

[0006] However, it should be noted that TiC 0.5 O 0.43If the precursor contains a high oxygen content and participates directly in the Ti2AlC reaction without effective treatment, it is prone to forming oxide impurities such as TiO2 during sintering, and will also lead to insufficient carbon activity in the system, thus affecting the formation of the Ti2AlC main phase. In addition, Al is easily volatilized under high temperature conditions, and the formation of Ti2AlC depends on a suitable Al activity. Therefore, in this system, it is also necessary to solve the problems of deoxidation, carbon replenishment, and Al volatilization compensation at the same time.

[0007] Therefore, how to use TiC 0.5 O 0.43 Using oxygen-containing titanium carbon waste as starting material, a new route for preparing Ti2AlC that balances deoxidation and carbon replenishment and can effectively regulate Al activity is needed to realize the resource utilization of waste and obtain high-phase-purity Ti2AlC materials. This has become a key technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] To address the problems and shortcomings of the existing technology, this invention provides a method for preparing Ti2AlC material and its application. The core of this invention lies in employing a two-step process: firstly, Ti2AlC is prepared by Ca deoxidation and dextrin carbon supplementation under an Ar atmosphere. 0.5 O 0.43 The TiC intermediate powder was converted into TiC. Subsequently, Ti2AlC material was prepared by reaction sintering of TiC, Ti and Al, and the formation of secondary phases was suppressed by synergistic regulation of Al activity and carbon activity.

[0009] The present invention is achieved through the following technical solution.

[0010] A method for preparing Ti2AlC material, comprising the following steps: (1) Pre-carbonization: TiC 0.5 O 0.43 The powder was mixed with dextrin, compressed into tablets, and pre-carbonized at high temperature under an Ar atmosphere. (2) Preparation of TiC intermediate powder: After high-temperature pre-carbonization, it is isolated and sampled with metallic Ca under Ar protection and then reduced at high temperature to obtain the reduction product. The reduction product is then acid-washed, washed and dried to obtain TiC powder. (3) Ti2AlC precursor mixture: TiC powder is mixed evenly with Ti powder and Al powder to obtain Ti2AlC reaction mixture; (4) Molding and reaction sintering: After the Ti2AlC reaction mixture is shaped, it is hot-pressed or spark plasma sintered in a vacuum or high-purity Ar atmosphere to obtain Ti2AlC material.

[0011] In step (1), dextrin is pre-carbonized to provide a carbon source, and dextrin is added based on a dextrin carbon yield of 20-35 wt%.

[0012] The specific processing method for step (1) is as follows: 1.1, Add TiC 0.5 O 0.43 After drying the powder and dextrin separately, dry grind them for 10-20 minutes, then add anhydrous ethanol and wet grind for 5-15 minutes, finally dry and break them up, and compress them into tablets. 1.2 Under Ar atmosphere, the temperature is increased from room temperature to 200℃ at a heating rate of 2℃ / min and held for 30min; then the temperature is increased from 200℃ to 450℃ at a heating rate of 2℃ / min and held for 1h for high-temperature pre-carbonization.

[0013] In step (2), metal Ca is placed at the bottom of the isolated sample container, and a pre-carbonized compact is placed on top, separated by a nickel mesh or a porous bracket; the amount of metal Ca added is 1.05 to 1.30 times the theoretical deoxidation amount.

[0014] In step (2), the high-temperature reduction is carried out by first purging Ar gas at 200 mL / min for 30 min under an Ar atmosphere, then heating at 300°C from room temperature to 300°C at a heating rate of 3°C / min and holding for 30 min, then heating at 5°C / min to 300°C to 800°C and holding for 1 h, and finally heating at 5°C / min to 800°C to 1050 to 1100°C and holding for 4 to 6 h for reduction. After the reaction, the temperature is naturally cooled to below 100°C under an Ar atmosphere.

[0015] The acid washing in step (2) is as follows: the reduction product is crushed, then soaked in 10wt% acetic acid for 2h, filtered, then soaked in 5wt% hydrochloric acid for 15-30min, then washed with deionized water until near neutral, finally rinsed with anhydrous ethanol, and then vacuum dried at 80℃ for 8-12h. After grinding, TiC powder is obtained.

[0016] In step (3), the purity of Ti powder and Al powder is not less than 99.5% and the particle size is less than 45μm; the molar ratio of TiC, Ti and Al is 1:1:1.01 to 1:1:1.10, and 1 to 2 wt% of activated carbon can be added to the total mass of the mixture.

[0017] The mixing in step (3) is carried out by ball milling, with ZrO2 balls or WC balls as the milling medium, a ball-to-material ratio of 5:1 to 10:1, a rotation speed of 150 to 250 rpm, a time of 4 to 8 hours, and anhydrous ethanol as the milling solvent. After the ball milling in step (3) is completed, the mixture is dried and sieved. In step (4), the molding is carried out by cold pressing at 100 to 200 MPa.

[0018] In step (4), the hot pressing sintering conditions are vacuum or high-purity Ar atmosphere, heating rate of 10℃ / min, pressure of 25~30MPa, holding temperature of 1350~1400℃, and holding time of 1~2h; or in step (4), spark plasma sintering is used, and the sintering conditions are vacuum or Ar atmosphere, pressure of 30MPa, sintering temperature of 1200~1400℃, and holding time of 10~20min.

[0019] A Ti2AlC material that can be used as a high-temperature structural component, a heat-resistant and conductive component, or a thermal shock resistant ceramic component.

[0020] The beneficial effects of this invention are: (1) This invention uses TiC 0.5 O 0.43 Using oxygen-containing titanium carbon precursors as raw materials, low-value-added by-products or wastes that are traditionally difficult to utilize directly are transformed into high-purity TiC intermediate powders, and then high-performance Ti2AlC materials are prepared. This realizes the resource utilization path of "oxygen-containing titanium carbon waste → TiC → Ti2AlC", which not only reduces raw material costs, but also has significant comprehensive resource utilization value and environmental benefits. (2) The present invention is first derived from TiC 0.5 O 0.43 Preparing relatively pure TiC intermediate powder from the precursor and then synthesizing Ti2AlC can effectively reduce the risk of oxide impurities caused by the direct participation of residual oxygen from the precursor in the reaction. (3) Carbon activity of the system can be improved by supplementing carbon with dextrin and, if necessary, a small amount of activated carbon, thereby reducing the possibility of carbon deficiency or secondary phase formation in TiC. (4) By setting a slightly Al-rich ratio, the loss of Al at high temperature can be compensated, which is beneficial to the establishment of the Ti2AlC main phase; (5) By using isolated sample loading, programmed heating and acid washing purification, the quality of TiC intermediate powder can be improved, providing stable raw materials for subsequent Ti2AlC synthesis; (6) The process parameters of this invention are clear and the operation steps are complete, which is suitable for process exploration under laboratory conditions and for subsequent scale-up verification. Attached Figure Description

[0021] Figure 1 This is the XRD pattern of the high-temperature reduction product after sintering prepared in Example 1 of the present invention; Figure 2 This is the XRD pattern of the Ti2AlC material prepared in Example 1 of this invention; Figure 3 This is a SEM image of the fracture surface or surface of the Ti2AlC material prepared in Example 1 of this invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] In the following embodiments, unless otherwise specified, the TiC used is... 0.5 O 0.43 The precursor powder to be processed is in the form of granules or diced Ca, and the purity of Ti powder and Al powder is not less than 99.5% and the particle size is less than 45 μm. Example 1

[0024] The preparation method of this Ti2AlC material includes the following steps: (1) Pre-carbonization: TiC 0.5 O 0.43 The powder was mixed with dextrin, compressed into tablets, and pre-carbonized at high temperature under an Ar atmosphere. The specific processing method for step (1) is as follows: 1.1. Place 2.00g TiC 0.5 O 0.43 After drying the powder and 0.85g of dextrin at 80℃ for 4h, they were first dry-ground for 15min, then wet-ground for 10min with 2-4mL of anhydrous ethanol added dropwise, dried at 60℃ to remove the ethanol, and finally dried and dispersed, and compressed into tablets at 10-15MPa. 1.2 Under Ar atmosphere, the temperature is increased from room temperature to 200℃ at a heating rate of 2℃ / min and held for 30min; then the temperature is increased from 200℃ to 450℃ at a heating rate of 2℃ / min and held for 1h for high-temperature pre-carbonization.

[0025] (2) Preparation of TiC intermediate powder: After high-temperature pre-carbonization, TiC powder was obtained by isolated loading of TiC powder with metallic Ca under Ar protection and high-temperature reduction. The TiC powder was obtained by acid washing, washing and drying of TiC powder. Metallic Ca was placed at the bottom of the isolated loading, and pre-carbonized compact was placed on the top layer. The two layers were separated by a nickel mesh or a porous support. The amount of metallic Ca added was 1.25 times the theoretical deoxidation amount. The high-temperature reduction was carried out by first replacing the TiC powder with Ar gas at 200 mL / min for 30 min under Ar atmosphere, and then reducing the temperature from room temperature to 300℃ at a rate of 3℃ / min. n. Hold at this temperature for 30 min, then continue heating at a rate of 5 °C / min to 300 °C to 800 °C and hold for 1 h. Finally, heat to 800 °C to 1050 °C at a rate of 5 °C / min and hold for 4 h for reduction. After the reaction, allow to cool naturally to below 100 °C under an Ar atmosphere. Acid washing is performed by crushing the reduction product, then immersing it in 10 wt% acetic acid for 2 h, filtering, and then immersing it in 5 wt% hydrochloric acid for 15 min. Subsequently, wash with deionized water until nearly neutral, and finally rinse with anhydrous ethanol. Then, vacuum dry at 80 °C for 8 h and grind it to obtain TiC powder. (3) Ti2AlC precursor mixture: TiC powder is mixed evenly with Ti powder and Al powder to obtain Ti2AlC reaction mixture; the molar ratio of TiC, Ti and Al is 1:1:1.05, ZrO2 balls are used as the ball milling medium, and the mixture is ball milled for 6 hours in anhydrous ethanol medium at a ball-to-material ratio of 8:1 and a rotation speed of 200 rpm; after ball milling, the mixture is dried and sieved. (4) Molding and reaction sintering: After the Ti2AlC reaction mixture is shaped at 150MPa, it is hot-pressed and sintered in a vacuum or high-purity Ar atmosphere at a heating rate of 10℃ / min, a pressure of 30MPa, a sintering temperature of 1400℃, and a holding time of 1h to obtain Ti2AlC material.

[0026] The XRD pattern of the high-temperature reduction product after sintering is shown in the figure. Figure 1 As shown, from Figure 1 The data shows that the main diffraction peaks in the reduction product correspond to the TiC phase, with no obvious TiO2 or other oxide impurity phase peaks observed. This indicates that after Ca reduction and dextrin carbon supplementation, the TiC phase... 0.5 O 0.43 The oxygen in the precursor was effectively removed and successfully converted into TiC intermediate powder, indicating that the deoxidation-carbon replenishment synergistic mechanism has a good effect. The XRD pattern of the Ti2AlC material is shown below. Figure 2 As shown, from Figure 2 The results show that the main diffraction peaks of the sintered sample match the standard Ti2AlC card, indicating the successful synthesis of the target Ti2AlC phase. Simultaneously, only a small amount of residual TiC peaks were observed, and no obvious TiAl or Ti3Al secondary phases were detected, indicating that the synergistic regulation of carbon and Al activity effectively suppressed side reactions and improved the phase purity of Ti2AlC. Figure 3 The fracture surface of the sample exhibits a typical layered structure with relatively dense grain arrangement and good interfacial bonding. No obvious pores or cracks were observed, indicating that the prepared Ti2AlC material has high density. This layered structure is beneficial to improving the thermal shock resistance and machinability of the material. Example 2

[0027] The preparation method of this Ti2AlC material includes the following steps: (1) Pre-carbonization: TiC 0.5 O 0.43 The powder was mixed with dextrin, compressed into tablets, and pre-carbonized at high temperature under an Ar atmosphere. The specific processing method for step (1) is as follows: 1.1. Place 2.00g TiC 0.5 O 0.43The powder and 0.77g of dextrin (a 10% decrease compared to Example 1) were dried at 80°C for 4 hours. They were then dry-milled for 15 minutes, followed by wet milling with 2-4mL of anhydrous ethanol added dropwise for 10 minutes. After drying at 60°C to remove the ethanol, the powder was dried and dispersed, and then compressed into tablets at 10-15MPa. 1.2 Under Ar atmosphere, the temperature is increased from room temperature to 200℃ at a heating rate of 2℃ / min and held for 30min; then the temperature is increased from 200℃ to 450℃ at a heating rate of 2℃ / min and held for 1h for high-temperature pre-carbonization.

[0028] (2) Preparation of TiC intermediate powder: After high-temperature pre-carbonization, TiC powder was obtained by isolated loading of TiC powder with metallic Ca under Ar protection and high-temperature reduction. The TiC powder was obtained by acid washing, washing and drying of TiC powder. Metallic Ca was placed at the bottom of the isolated loading, and pre-carbonized compact was placed on the top layer. The two layers were separated by a nickel mesh or a porous support. The amount of metallic Ca added was 1.25 times the theoretical deoxidation amount. The high-temperature reduction was carried out by first replacing the TiC powder with Ar gas at 200 mL / min for 30 min under Ar atmosphere, and then reducing the temperature from room temperature to 300℃ at a rate of 3℃ / min. n. Hold at this temperature for 30 min, then continue heating at a rate of 5 °C / min to 300 °C to 800 °C and hold for 1 h. Finally, heat to 800 °C to 1050 °C at a rate of 5 °C / min and hold for 4 h for reduction. After the reaction, allow to cool naturally to below 100 °C under an Ar atmosphere. Acid washing is performed by crushing the reduction product, then immersing it in 10 wt% acetic acid for 2 h, filtering, and then immersing it in 5 wt% hydrochloric acid for 15 min. Subsequently, wash with deionized water until nearly neutral, and finally rinse with anhydrous ethanol. Then, vacuum dry at 80 °C for 8 h and grind it to obtain TiC powder. (3) Ti2AlC precursor mixture: TiC powder is mixed evenly with Ti powder and Al powder to obtain Ti2AlC reaction mixture; the molar ratio of TiC, Ti and Al is 1:1:1.1, ZrO2 balls are used as the ball milling medium, and the mixture is ball milled for 6 hours in anhydrous ethanol medium at a ball-to-material ratio of 8:1 and a speed of 200 rpm; after ball milling, the mixture is dried and sieved. (4) Molding and reaction sintering: After the Ti2AlC reaction mixture is shaped at 150MPa, it is hot-pressed and sintered in a vacuum or high-purity Ar atmosphere at a heating rate of 10℃ / min, a pressure of 30MPa, a sintering temperature of 1350℃, and a holding time of 1h to obtain Ti2AlC material. Example 3

[0029] The preparation method of this Ti2AlC material includes the following steps: (1) Pre-carbonization: TiC 0.5 O 0.43 The powder was mixed with dextrin, compressed into tablets, and pre-carbonized at high temperature under an Ar atmosphere. The specific processing method for step (1) is as follows: 1.1. Place 2.00g TiC 0.5 O 0.43 The powder and 0.94g of dextrin (10% more than in Example 1) were dried at 80°C for 4 hours. They were then dry-milled for 15 minutes, and then wet-milled for 10 minutes with 2-4mL of anhydrous ethanol added dropwise. After drying at 60°C to remove the ethanol, they were dried and dispersed, and then compressed into tablets at 10-15MPa. 1.2 Under Ar atmosphere, the temperature is increased from room temperature to 200℃ at a heating rate of 2℃ / min and held for 30min; then the temperature is increased from 200℃ to 450℃ at a heating rate of 2℃ / min and held for 1h for high-temperature pre-carbonization.

[0030] (2) Preparation of TiC intermediate powder: After high-temperature pre-carbonization, TiC powder was obtained by isolated loading of TiC powder with metallic Ca under Ar protection and high-temperature reduction. The TiC powder was obtained by acid washing, washing and drying of TiC powder. Metallic Ca was placed at the bottom of the isolated loading, and pre-carbonized compact was placed on the top layer. The two layers were separated by a nickel mesh or a porous support. The amount of metallic Ca added was 1.25 times the theoretical deoxidation amount. The high-temperature reduction was carried out by first replacing the TiC powder with Ar gas at 200 mL / min for 30 min under Ar atmosphere, and then reducing the temperature from room temperature to 300℃ at a rate of 3℃ / min. n. Hold at this temperature for 30 min, then continue heating at a rate of 5 °C / min to 300 °C to 800 °C and hold for 1 h. Finally, heat to 800 °C to 1100 °C at a rate of 5 °C / min and hold for 6 h for reduction. After the reaction, allow to cool naturally to below 100 °C under an Ar atmosphere. Acid washing is performed by crushing the reduction product, then immersing it in 10 wt% acetic acid for 2 h, filtering, and then immersing it in 5 wt% hydrochloric acid for 15 min. Subsequently, wash with deionized water until nearly neutral, and finally rinse with anhydrous ethanol. Then, vacuum dry at 80 °C for 8 h and grind it to obtain TiC powder. (3) Ti2AlC precursor mixture: TiC powder is mixed evenly with Ti powder and Al powder to obtain Ti2AlC reaction mixture; the molar ratio of TiC, Ti and Al is 1:1:1.05, and activated carbon accounting for 1 wt% of the total mass of the mixture is added as a supplementary carbon source. ZrO2 balls are used as the ball milling medium, and the mixture is ball milled for 6 hours in anhydrous ethanol medium at a ball-to-material ratio of 8:1 and a rotation speed of 200 rpm; after ball milling, the mixture is dried and sieved. (4) Molding and reaction sintering: The Ti2AlC reaction mixture is directly loaded into a graphite mold for discharge plasma sintering. The sintering conditions are vacuum or Ar atmosphere, pressure 30MPa, sintering temperature 1300℃, and holding for 20min to obtain Ti2AlC material.

[0031] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for producing a Ti2AlC material, characterized in that Includes the following steps: (1) Pre-carbonization: TiC powder was mixed with dextrin, tableted and pre-carbonized at high temperature under Ar atmosphere; 0.5 O 0.43 powder was mixed with dextrin, tableted and pre-carbonized at high temperature under Ar atmosphere; (2) Preparation of TiC intermediate powder: After high-temperature pre-carbonization, it is isolated and sampled with metallic Ca under Ar protection and then reduced at high temperature to obtain the reduction product. The reduction product is then acid-washed, washed and dried to obtain TiC powder. (3) Ti2AlC precursor mixture: TiC powder is mixed evenly with Ti powder and Al powder to obtain Ti2AlC reaction mixture; (4) Molding and reaction sintering: After the Ti2AlC reaction mixture is shaped, it is hot-pressed or spark plasma sintered in a vacuum or high-purity Ar atmosphere to obtain Ti2AlC material.

2. The method of producing Ti2AlC material according to claim 1, characterized in that: In step (1), dextrin is pre-carbonized to provide a carbon source, and dextrin is added based on a dextrin carbon yield of 20-35 wt%.

3. The method of claim 1, wherein: The specific processing method for step (1) is as follows: 1.1, TiC 0.5 O 0.43 After drying the powder and dextrin respectively, dry grinding for 10-20 min, then wet grinding with anhydrous ethanol for 5-15 min, and finally drying and breaking up, tabletting; 1.2 Under Ar atmosphere, the temperature is increased from room temperature to 200℃ at a heating rate of 2℃ / min and held for 30min; then the temperature is increased from 200℃ to 450℃ at a heating rate of 2℃ / min and held for 1h for high-temperature pre-carbonization.

4. The method of claim 1, wherein: In step (2), metal Ca is placed at the bottom of the isolated sample container, and a pre-carbonized compact is placed on top, separated by a nickel mesh or a porous bracket; the amount of metal Ca added is 1.05 to 1.30 times the theoretical deoxidation amount.

5. The method for preparing Ti2AlC material according to claim 4, characterized in that: In step (2), the high-temperature reduction is carried out by first purging Ar gas at 200 mL / min for 30 min under an Ar atmosphere, then heating at 300°C from room temperature to 300°C at a heating rate of 3°C / min and holding for 30 min, then heating at 5°C / min to 300°C to 800°C and holding for 1 h, and finally heating at 5°C / min to 800°C to 1050 to 1100°C and holding for 4 to 6 h for reduction. After the reaction, the temperature is naturally cooled to below 100°C under an Ar atmosphere.

6. The method for preparing Ti2AlC material according to claim 1, characterized in that: The acid washing in step (2) is as follows: the reduction product is crushed, then soaked in 10wt% acetic acid for 2h, filtered, then soaked in 5wt% hydrochloric acid for 15-30min, then washed with deionized water until near neutral, finally rinsed with anhydrous ethanol, and then vacuum dried at 80℃ for 8-12h. After grinding, TiC powder is obtained.

7. The method for preparing Ti2AlC material according to claim 1, characterized in that: In step (3), the purity of Ti powder and Al powder is not less than 99.5% and the particle size is less than 45μm; the molar ratio of TiC, Ti and Al is 1:1:1.01 to 1:1:1.10, and 1 to 2 wt% of activated carbon can be added to the total mass of the mixture.

8. The method for preparing Ti2AlC material according to claim 7, characterized in that: The mixing in step (3) is carried out by ball milling, with ZrO2 balls or WC balls as the milling medium, a ball-to-material ratio of 5:1 to 10:1, a rotation speed of 150 to 250 rpm, a time of 4 to 8 hours, and anhydrous ethanol as the milling solvent. After the ball milling in step (3) is completed, the mixture is dried and sieved. In step (4), the molding is carried out by cold pressing at 100 to 200 MPa.

9. The method for preparing Ti2AlC material according to claim 1, characterized in that: In step (4), the hot pressing sintering conditions are vacuum or high-purity Ar atmosphere, heating rate of 10℃ / min, pressure of 25~30MPa, holding temperature of 1350~1400℃, and holding time of 1~2h; or in step (4), spark plasma sintering is used, and the sintering conditions are vacuum or Ar atmosphere, pressure of 30MPa, sintering temperature of 1200~1400℃, and holding time of 10~20min.

10. A Ti2AlC material prepared by any one of the preparation methods according to claims 1 to 9 can be used as a high-temperature structural component, a heat-resistant conductive component, or a thermal shock resistant ceramic component.

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