Method for flash sintering mab phase material using an intermediate phase, mab phase material and applications

Abstract

This invention discloses a method for flash sintering MAB phase materials using the mesophase, specifically implemented according to the following steps: Step 1, Raw material mixing: Weigh transition metal M powder and AlB2 powder according to the stoichiometric ratio corresponding to the general structural formula of MAB phase materials, and obtain a uniformly mixed precursor powder through mechanical ball milling and freeze-drying; Step 2, Cold pressing: Place the obtained precursor powder in a metal mold and obtain a dense precursor block through uniaxial cold pressing; Step 3, Flash sintering: Coat the obtained precursor block with a carbon medium and perform flash sintering in an inert atmosphere; Step 4, Finished product powder preparation: Perform mechanical ball milling and freeze-drying on the obtained MAB block to finally obtain a high-purity MAB phase powder product. This method, through a novel reaction path design, greatly shortens the synthesis cycle and fundamentally eliminates the risk of aluminum powder explosion, providing a reliable solution for achieving high-quality, mass production of MAB phase materials.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic wave absorbing material preparation technology, specifically relating to a method for flash sintering MAB phase powder using an intermediate phase, and also relating to MAB phase materials flash sintered using an intermediate phase and the application of MAB phase materials in the field of electromagnetic wave absorption. Background Technology

[0002] MAB phase is a novel class of ternary layered borides, whose crystal structure consists of alternating layers of transition metal-boron (MB) and aluminum (Al) atoms. It combines the high strength and hardness of ceramics with the excellent electrical and thermal conductivity and processability of metals, playing a crucial role in high-tech fields such as energy, catalysis, aerospace, and defense. Its derived two-dimensional material, MBene, has become a frontier in current research on two-dimensional functional materials, demonstrating enormous potential in areas such as high-efficiency energy storage and electrocatalytic conversion, and representing a significant breakthrough for achieving related technological advancements.

[0003] However, traditional MAB phase preparation processes, such as pressureless sintering, hot pressing sintering, and plasma sintering, generally suffer from high energy consumption, long cycles, and low purity. Chinese invention patent "An Ultrafast Preparation Method for MAX Phase Materials" (Application No.: CN202510608337.9, Publication No.: CN120328560A, Publication Date: 2025.07.18) discloses a method for preparing MAX phase materials using ultrafast Joule heating sintering, which significantly shortens the preparation cycle due to its extremely high heating and cooling rates. Chinese invention patent "A MAB Phase Ceramic Powder and Its Preparation Method and Application" (Application No.: CN202510255617.6, Publication No.: CN119977593A, Publication Date: 2025.05.13) provides a new approach for the controllable preparation of MAB phases by first synthesizing MB intermediate powder and then reacting it with aluminum powder. Nevertheless, existing preparation methods still face common challenges: on the one hand, to suppress the volatilization loss of aluminum, excessive aluminum powder is often required, leading to safety hazards such as combustion and explosion; on the other hand, some sintering strategies, due to their complex processes and long reaction cycles, still fail to meet the requirements for purity and structural uniformity. Therefore, developing novel synthesis processes that combine high safety, high efficiency, and high purity remains a core issue that urgently needs to be addressed to advance MAB phase materials towards practical applications. Summary of the Invention

[0004] The first objective of this invention is to provide a method for flash sintering MAB phase powder using a mesophase. Through a novel reaction pathway design, the synthesis cycle is greatly shortened, and the risk of aluminum powder explosion is fundamentally eliminated, providing a reliable solution for achieving high-quality, mass production of MAB phase materials.

[0005] A second objective of this invention is to provide MAB phase materials that utilize mesophase flash sintering.

[0006] The third objective of this invention is the application of MAB phase materials in the field of electromagnetic wave absorption.

[0007] The first technical solution adopted in this invention is a method of flash sintering MAB phase materials using the mesophase, specifically implemented according to the following steps: Step 1, Raw material mixing: Weigh the transition metal M powder and AlB2 (aluminum boride) powder according to the stoichiometric ratio corresponding to the general structural formula of MAB phase materials, and obtain a uniformly mixed precursor powder by mechanical ball milling and freeze drying. Step 2, cold pressing: The obtained precursor powder is placed in a metal mold and cold pressed by a single axis to obtain a dense precursor blank; Step 3, flash sintering: The obtained precursor billet is coated with carbon medium and flash sintered in an inert atmosphere to obtain a high-purity MAB phase block. Step 4: Finished product powder preparation: The obtained MAB blocks are mechanically ball-milled, freeze-dried, and sieved to obtain high-purity MAB phase powder products.

[0008] The invention is further characterized in that: In step 1, the freeze-drying temperature is -80℃ to -50℃, and the time is 24 hours to 48 hours; In step 1, the general structural formula of the MAB phase is type 2-1-2; The transition metal M powder is any one or more of Ti, V, Cr, Mn, Fe, Mo, and W powders.

[0009] In step 1, the particle size of both the TM element powder and the AlB2 powder is 500 nm to 50 μm.

[0010] In step 1, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process of step 1, the ball-to-material ratio is 5:1 to 15:1, the ball milling speed is 300 rpm to 400 rpm, and the ball milling time is 8 hours to 12 hours.

[0011] In step 2, the cold pressing mold is made of high carbon high chromium mold steel, the cold pressing pressure is 300MPa-350MPa, the holding time is 30 minutes-60 minutes, and the resulting blank is in sheet shape with a diameter of 15mm, a thickness of 5mm, and a relative density of not less than 80%.

[0012] Step 3 involves covering the pressed precursor blank with carbon fiber felt and then flash sintering it under an argon atmosphere. The applied current during flash sintering is 15A-30A, the working voltage is 20V-30V, and the sintering process is maintained at 1100℃-1600℃ for 30-180 seconds, followed by furnace cooling to room temperature. The carbon fiber felt has specific dimensions of 90mm in length, 20mm in width, and 8-10mm in thickness.

[0013] In step 4, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process in step 4, the ball-to-material ratio is 2:1 to 8:1, the ball milling speed is 200 rpm to 300 rpm, and the ball milling time is controlled to be 1 hour to 5 hours; Step 4 finally yields MAB phase powder with a particle size distribution of 0.5μm~20μm.

[0014] The second technical solution adopted in this invention is to prepare the MAB phase material by means of the above method using the mesophase flash sintering.

[0015] The third technical solution adopted in this invention is the application of the MAB phase material prepared by the above method in the field of electromagnetic wave absorption.

[0016] The beneficial effects of this invention are: This invention utilizes mesophase flash sintering of MAB phase powder, overcoming the core challenges of traditional preparation methods and forming a safe and efficient overall solution. Its significant advantages are mainly reflected in the following aspects: First, it achieves a fundamental breakthrough in safety. By using the stable AlB2 compound to replace the flammable and explosive Al and B powders, the inherent dust explosion and high-risk hazards of traditional methods are completely eliminated at the source, providing a prerequisite for industrial-grade safe production. Second, it demonstrates extremely high efficiency in the reaction pathway. AlB2 and MAB phases have similar crystal structures, significantly reducing the atomic recombination energy barrier and activation energy from reactants to products. This allows solid-phase reactions that originally required long-term high-temperature sintering to be efficiently completed within seconds (30-180 seconds) of flash sintering, greatly shortening the synthesis cycle and reducing energy consumption. Third, it provides excellent assurance in product quality. This technology avoids the introduction of impurities through surface oxidation of elemental Al powder, ensuring precise control of chemical composition and high product purity. Simultaneously, the all-solid-state reaction pathway facilitates the formation of a uniform and dense microstructure. The integration of the above-mentioned technological advantages provides a practical solution to the industrialization bottleneck of MAB phase material synthesis. The MAB phase material prepared by the method of this invention exhibits electromagnetic wave absorption characteristics. Attached Figure Description

[0017] Figure 1 The XRD pattern of the MAB phase material Mn2AlB2 in Example 1; Figure 2 SEM image (4 μm) of MAB phase material Mn2AlB2 in Example 1. Figure 3 The RL value of the MAB phase material Mn2AlB2 in Example 1; Figure 4 The XRD pattern of the MAB phase material Fe2AlB2 in Example 2; Figure 5 SEM image (4 μm) of the MAB phase material Fe2AlB2 in Example 2. Figure 6 The RL value is the MAB phase material Fe2AlB2 in Example 2. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This invention provides a method for flash sintering MAB phase materials using a mesophase, specifically implemented according to the following steps: Step 1, Raw material mixing: Weigh the transition metal M powder and AlB2 (aluminum boride) powder according to the stoichiometric ratio corresponding to the general structural formula of MAB phase materials, and obtain a uniformly mixed precursor powder by mechanical ball milling and freeze drying. In step 1, the freeze-drying temperature is -80℃ to -50℃, and the time is 24 hours to 48 hours; In step 1, the general structural formula of the MAB phase is type 2-1-2; The transition metal M powder is any one or more of Ti, V, Cr, Mn, Fe, Mo, and W powders.

[0020] In step 1, the particle size of both the TM element powder and the AlB2 powder is 500 nm to 50 μm.

[0021] In step 1, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process of step 1, the ball-to-material ratio is 5:1 to 15:1, the ball milling speed is 300 rpm to 400 rpm, and the ball milling time is 8 hours to 12 hours.

[0022] Step 2, cold pressing: The obtained precursor powder is placed in a metal mold of a specific size and cold pressed by a single axis to obtain a dense precursor blank; In step 2, the cold pressing mold is made of high carbon high chromium mold steel, the cold pressing pressure is 300MPa-350MPa, the holding time is 30 minutes-60 minutes, and the resulting blank is in sheet shape with a diameter of 15mm, a thickness of 5mm, and a relative density of not less than 80%.

[0023] Step 3, flash sintering: The obtained precursor billet is coated with carbon medium and flash sintered in an inert atmosphere to obtain a high-purity MAB phase block. Step 3 involves covering the pressed precursor blank with carbon fiber felt and then flash sintering it under an argon atmosphere. The applied current during flash sintering is 15A-30A, the working voltage is 20V-30V, and the sintering process is maintained at 1100℃-1600℃ for 30-180 seconds, followed by furnace cooling to room temperature. The carbon fiber felt has specific dimensions of 90mm in length, 20mm in width, and 8mm-10mm in thickness.

[0024] Step 4: Finished product powder preparation: The obtained MAB blocks are mechanically ball-milled, freeze-dried, and sieved to obtain high-purity MAB phase powder products.

[0025] In step 4, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process in step 4, the ball-to-material ratio is 2:1 to 8:1, the ball milling speed is 200 rpm to 300 rpm, and the ball milling time is controlled to be 1 hour to 5 hours; Step 4 finally yields MAB phase powder with a particle size distribution of 0.5μm~20μm.

[0026] The present invention also provides the application of the MAB phase material prepared by the above method in the field of electromagnetic wave absorption.

[0027] Example 1 The mesophase flash sintering of Mn2AlB2 powder is carried out according to the following steps: Mn powder and AlB2 powder were precisely weighed at a molar ratio of 2:1, with both Mn and AlB2 powders having a particle size of 500 nm. The Mn and AlB2 powders were added to a ball mill jar along with zirconia grinding beads at a ball-to-particle ratio of 10:1. Anhydrous ethanol was added as the grinding medium, and the mixture was wet-milled at 300 rpm for 10 hours. The milled slurry was then freeze-dried at -80°C for 24 hours to obtain a homogeneous precursor powder.

[0028] The obtained precursor powder was loaded into a metal mold and uniaxially pressed under a pressure of 300 MPa for 30 minutes to obtain a precursor blank with a diameter of 15 mm and a thickness of 5 mm.

[0029] The obtained precursor billet was wrapped with carbon fiber felt measuring 90 mm in length, 20 mm in width, and 10 mm in thickness, and placed in a flash sintering apparatus. A DC voltage of 30 A and a working voltage range of 30 V was applied under an argon atmosphere. After heating to 1200 °C and holding for 120 seconds, flash sintering was completed. After cooling with the furnace, a high-purity Mn2AlB2 block was obtained.

[0030] The obtained Mn2AlB2 blocks were mechanically crushed and then loaded into a ball mill jar with zirconia grinding beads at a ball-to-material ratio of 5:1. Anhydrous ethanol was used as the grinding medium, and the mixture was ball-milled at 250 rpm for 5 hours. Finally, after sieving, Mn2AlB2 powder with a particle size range of 0.5 μm-20 μm was obtained and stored in vacuum-sealed aluminum foil bags filled with argon gas.

[0031] Figure 1 The X-ray diffraction pattern of the obtained Mn2AlB2 powder is shown. All diffraction peaks perfectly match the Mn2AlB2 standard card, and no obvious impurity phases are observed, confirming that high-purity MAB phase was successfully synthesized by this method. Figure 2 Scanning electron microscope images further revealed its typical layered stacking morphology at the microscale, with uniform grain size, demonstrating the dense microstructure induced by the flash sintering process.

[0032] Example 2 The process of flash sintering Fe2AlB2 powder using the mesophase is carried out according to the following steps: Fe powder and AlB2 powder were accurately weighed at a molar ratio of 2:1, with both powders having a particle size of 50 μm. The Fe and AlB2 powders were then added to a ball mill jar along with zirconia grinding beads at a ball-to-powder ratio of 15:1. Anhydrous ethanol was used as the milling medium, and the mixture was wet-milled at 400 rpm for 12 hours. The milled slurry was then freeze-dried at -50°C for 48 hours to obtain a homogeneous precursor powder.

[0033] The obtained precursor powder was loaded into a metal mold and uniaxially pressed under a pressure of 350 MPa for 30 minutes to obtain a precursor blank with a diameter of 15 mm and a thickness of 5 mm.

[0034] The obtained precursor billet was wrapped with carbon fiber felt measuring 90 mm in length, 20 mm in width, and 9 mm in thickness, and placed in a flash sintering apparatus. A DC voltage of 15 A and a working voltage range of 20 V was applied under an argon atmosphere. After heating to 1300 °C and holding for 180 seconds, flash sintering was completed. After cooling in the furnace, a high-purity Fe2AlB2 block was obtained.

[0035] The obtained Fe2AlB2 blocks were mechanically crushed and then loaded into a ball mill jar with zirconia grinding beads at a ball-to-material ratio of 8:1. Anhydrous ethanol was used as the grinding medium, and the mixture was ball-milled at 300 rpm for 3 hours. Finally, the powder was sieved to obtain Fe2AlB2 powder with a particle size range of 0.5 μm-20 μm. The powder was then stored in vacuum-sealed aluminum foil bags filled with argon gas.

[0036] Figure 4 The X-ray diffraction pattern of the obtained Fe2AlB2 powder is shown. All diffraction peaks perfectly match the Fe2AlB2 standard card, and no obvious impurity phases are observed, confirming that high-purity MAB phase was successfully synthesized by this method. Figure 5 Scanning electron microscope images further revealed its typical layered stacking morphology at the microscale, with uniform grain size, demonstrating the dense microstructure induced by the flash sintering process.

[0037] Example 3 The mesophase flash sintering of CrMnAlB2 powder is carried out according to the following steps: Cr powder, Mn powder, and AlB2 powder were accurately weighed in a 1:1:1 molar ratio, with each powder having a particle size of 20 μm. These powders were then added to a ball mill jar along with zirconia grinding beads at a 5:1 ball-to-particle ratio. Anhydrous ethanol was used as the milling medium, and the mixture was wet-milled at 350 rpm for 8 hours. The milled slurry was then freeze-dried at -60°C for 30 hours to obtain a homogeneous precursor powder.

[0038] The obtained precursor powder was loaded into a metal mold and uniaxially pressed under a pressure of 320 MPa for 30 minutes to obtain a precursor blank with a diameter of 15 mm and a thickness of 5 mm.

[0039] The obtained precursor billet was wrapped with carbon fiber felt measuring 90 mm in length, 20 mm in width, and 8 mm in thickness, and placed in a flash sintering apparatus. A DC voltage of 20 A and a working voltage range of 20 V was applied under an argon atmosphere. After heating to 1100 °C and holding for 60 seconds, flash sintering was completed. After cooling in the furnace, a high-purity CrMnAlB2 block was obtained.

[0040] The obtained CrMnAlB2 blocks were mechanically crushed and then loaded into a ball mill jar with zirconia grinding beads at a ball-to-material ratio of 2:1. Anhydrous ethanol was used as the grinding medium, and the mixture was ball-milled at 200 rpm for 1 hour. Finally, after sieving, CrMnAlB2 powder with a particle size range of 0.5 μm-20 μm was obtained and stored in vacuum-sealed aluminum foil bags filled with argon gas.

[0041] Example 4 Using mesophase flash sintering of Cr 2 / 3 Mn2 / 3 Fe 2 / 3 AlB2 powder, specifically implemented according to the following steps: Cr, Mn, Fe, and AlB2 powders were precisely weighed in a molar ratio of 2:2:2:3, with a particle size of 500 nm for all powders. The Cr, Mn, Fe, and AlB2 powders were then added to a ball mill jar with zirconia grinding beads at a ball-to-powder ratio of 12:1. Anhydrous ethanol was used as the milling medium, and the mixture was wet-milled at 400 rpm for 9 hours. The milled slurry was then freeze-dried at -70°C for 24 hours to obtain a homogeneous precursor powder.

[0042] The obtained precursor powder was loaded into a metal mold and uniaxially pressed under a pressure of 330 MPa for 30 minutes to obtain a precursor blank with a diameter of 15 mm and a thickness of 5 mm.

[0043] The obtained precursor billet was wrapped with carbon fiber felt measuring 90 mm in length, 20 mm in width, and 10 mm in thickness, and placed in a flash sintering apparatus. Under an argon atmosphere, a DC voltage of 30 A and a working voltage range of 25 V was applied. Flash sintering was completed by heating to 1300 °C and holding for 100 seconds. After furnace cooling, high-purity Cr was obtained. 1 / 3 Mn 1 / 3 Fe 1 / 3 AlB2 blocks.

[0044] The obtained Cr 2 / 3 Mn 2 / 3 Fe 2 / 3 After mechanical crushing, AlB2 blocks were loaded into a ball mill jar with zirconia grinding beads at a ball-to-material ratio of 6:1. Anhydrous ethanol was used as the milling medium, and the mixture was ball-milled at 280 rpm for 4 hours. Finally, the mixture was sieved to obtain Cr particles with a particle size range controlled between 0.5 μm and 20 μm. 2 / 3 Mn 2 / 3 Fe 2 / 3 AlB2 powder was stored in an aluminum foil bag that was vacuum-sealed and filled with argon gas.

[0045] Example 5 The MAB phase powder obtained by flash sintering is further used to prepare microwave absorbing materials, specifically according to the following steps: Accurately weigh the Mn2AlB2 powder obtained in Example 1 or the Fe2AlB2 powder obtained in Example 2, and mix it with the epoxy system material, wherein the MAB phase powder accounts for 5 wt% of the total mixture and the epoxy system material accounts for 95 wt% of the total mixture (the epoxy system material is composed of E-51 epoxy resin and polyamide curing agent, with a mass ratio of E-51 to polyamide curing agent of 3:1). The mixture is stirred at 800 rpm for 30 minutes using a combination of mechanical stirring and ultrasonic dispersion, and then ultrasonically treated at 300W power and 40kHz frequency for 1 hour to ensure that the powder is uniformly dispersed in the matrix without agglomeration.

[0046] The uniformly mixed slurry was sprayed evenly onto a surface-treated aluminum substrate (surface polished with 400-grit sandpaper and cleaned with isopropyl alcohol) using a high-pressure spray gun (nozzle diameter 0.3 mm, pressure 0.3 MPa), with the thickness of each spray coat controlled to approximately 0.2 mm. After spraying, the substrate was placed in a constant temperature oven for curing according to the following procedure: pre-curing at 80℃ for 1 hour, followed by curing at 120℃ for 2 hours, and then naturally cooled to room temperature to obtain a smooth and uniformly thick MAB / epoxy resin composite microwave absorbing coating. The coating thickness was controlled to two specifications: 1.9 ± 0.1 mm and 2.4 ± 0.1 mm, measured at multiple points using a micrometer.

[0047] The microwave absorption performance of the coating was characterized using a vector network analyzer (Agilent N5234A, frequency range 2-18 GHz) and in accordance with the bow test standard (ASTM D5568).

[0048] Figure 3 The image shows the reflection loss of the Mn2AlB2 / epoxy composite coating in Example 1. Test data shows that when the coating thickness is 1.9 mm, the minimum reflection loss at 11.84 GHz is -37.76 dB; when the thickness is 2.4 mm, the minimum reflection loss at 10.24 GHz is -46.57 dB.

[0049] Figure 6 The image shows the reflection loss of the Fe2AlB2 / epoxy composite coating in Example 2. Test data shows that when the coating thickness is 2.0 mm, the minimum reflection loss at 11.12 GHz is -23.39 dB; and when the thickness is 2.0 mm, the minimum reflection loss at 11.36 GHz is -25.60 dB.

[0050] Example 6 The mesophase flash sintering of Mn2AlB2 powder is carried out according to the following steps: Mn powder and AlB2 powder were precisely weighed at a molar ratio of 2:1, with both Mn and AlB2 powders having a particle size of 800 nm. The Mn and AlB2 powders were added to a ball mill jar along with zirconia grinding beads at a ball-to-powder ratio of 10:1. Anhydrous ethanol was added as the grinding medium, and the mixture was wet-milled at 300 rpm for 10 hours. The milled slurry was then freeze-dried at -60°C for 24 hours to obtain a homogeneous precursor powder.

[0051] The obtained precursor powder was loaded into a metal mold and uniaxially pressed under a pressure of 300 MPa for 30 minutes to obtain a precursor blank with a diameter of 15 mm and a thickness of 5 mm.

[0052] The obtained precursor billet was wrapped with carbon fiber felt measuring 90 mm in length, 20 mm in width, and 10 mm in thickness, and placed in a flash sintering apparatus. A DC voltage of 20 A and a working voltage range of 30 V was applied under an argon atmosphere. After heating to 1200 °C and holding for 120 seconds, flash sintering was completed. After cooling with the furnace, a high-purity Mn2AlB2 block was obtained.

[0053] The obtained Mn2AlB2 blocks were mechanically crushed and then loaded into a ball mill jar with zirconia grinding beads at a ball-to-material ratio of 5:1. Anhydrous ethanol was used as the grinding medium, and the mixture was ball-milled at 250 rpm for 4 hours. Finally, after sieving, Mn2AlB2 powder with a particle size range of 0.5 μm-20 μm was obtained and stored in vacuum-sealed aluminum foil bags filled with argon gas.

Claims

1. A method for flash sintering MAB phase materials using a mesophase, characterized in that, The specific steps are as follows: Step 1: Raw material mixing: Accurately weigh Cr powder, Mn powder, Fe powder and AlB2 powder according to a molar ratio of 2:2:2:3, and obtain a uniformly mixed precursor powder by mechanical ball milling and freeze drying. Step 2, cold pressing: The obtained precursor powder is placed in a metal mold and cold pressed by a single axis to obtain a dense precursor blank; Step 3, Flash Sintering: The obtained precursor billet is coated with a carbon medium and flash sintered in an inert atmosphere to obtain high-purity Cr. 2 / 3 Mn 2 / 3 Fe 2 / 3 AlB2 phase bulk; Step 4, Finished Product Powdering: The obtained Cr 2 / 3 Mn 2 / 3 Fe 2 / 3 AlB2 blocks were mechanically ball-milled, freeze-dried, and screened for fine selection to finally obtain high-purity Cr. 2 / 3 Mn 2 / 3 Fe 2 / 3 AlB2 phase powder products.

2. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: In step 1, the freeze-drying temperature is -80℃ to -50℃, and the time is 24 hours to 48 hours.

3. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: In step 1, the particle sizes of Cr powder, Mn powder, Fe powder and AlB2 powder are all 500 nm to 50 μm.

4. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: In step 1, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process of step 1, the ball-to-material ratio is 5:1 to 15:1, the ball milling speed is 300 rpm to 400 rpm, and the ball milling time is 8 hours to 12 hours.

5. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: In step 2, the cold pressing mold is made of high carbon high chromium mold steel, the cold pressing pressure is 300MPa-350MPa, and the holding time is 30 minutes-60 minutes.

6. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: The specific process of step 3 is as follows: the pressed precursor blank is covered with carbon fiber felt and then flash sintered under argon atmosphere protection; the current applied during flash sintering is 15A-30A, the working voltage is 20V-30V, the sintering process is maintained at 1100℃-1600℃ for 30 seconds-180 seconds, and then cooled to room temperature with the furnace.

7. The method for flash sintering MAB phase materials using the mesophase according to claim 1, characterized in that: In step 4, the mechanical ball milling adopts a wet ball milling process. Both the grinding balls and the grinding jar are made of zirconium oxide, and the grinding media is anhydrous ethanol or isopropanol. In the mechanical ball milling process in step 4, the ball-to-material ratio is 2:1 to 8:1, the ball milling speed is 200 rpm to 300 rpm, and the ball milling time is controlled to be 1 hour to 5 hours; Step 4 finally yields MAB phase powder with a particle size distribution of 0.5μm~20μm.

8. A MAB phase material sintered using mesophase flash sintering, characterized in that, It is prepared by the method described in any one of claims 1-7.

9. The application of the MAB phase material according to claim 8 in the field of electromagnetic wave absorption.

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