High-toughness wave-absorbing composite material, preparation method and application thereof

Abstract

The present invention relates to the technical field of novel bulletproof armor manufacturing, and discloses a high-strength and tough wave-absorbing composite material, a preparation method and an application thereof. The high-strength and tough wave-absorbing composite material is B4C-(Ti x Cr 1‑x )B2‑graphite,(Ti x Cr 1‑x ) The B2 content is 20 vol.%, and 0.48≤x≤0.89. The raw materials are weighed according to the following mass percentages: 69.54-72.35 wt.% of B4C, 13.11-24.11 wt.% of TiC, and 3.54-17.35 wt.% of CrB2; the raw materials are uniformly mixed to obtain a mixed powder; the mixed powder is placed in a mold and hot-pressed and sintered; and after sintering, the mixture is cooled to obtain a high-strength and toughness absorbing composite material. The high-strength and toughness absorbing composite material of the present invention has the advantages of high fracture toughness, high flexural strength, and strong absorbing performance. It is also highly reproducible, simple in steps, and easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of novel bulletproof armor manufacturing, and in particular to a high-strength and tough wave-absorbing composite material and a preparation method and application thereof. Background Art

[0002] In recent years, the rapid development of military radar technology has placed higher demands on traditional bulletproof armor. Traditional stealth technology typically involves applying an absorbing coating to the outside of the armor. However, this approach presents numerous challenges, such as increased equipment weight, poor broadband stealth performance, and high maintenance costs, making it inadequate for the demands of the modern battlefield. Therefore, structural design aims to improve armor materials while ensuring they meet mechanical performance requirements while also imparting superior absorbing properties, achieving integrated protection and stealth. This approach holds promise for addressing these challenges.

[0003] Boron carbide (B4C) has high hardness (>35GPa), low density (2.52g·cm -3 ), high elastic modulus, etc., it is a very promising armor material. At the same time, as a semiconductor material, B4C has certain electromagnetic wave absorption properties. Therefore, B4C is expected to become a new bulletproof material that integrates stealth protection. However, the low diffusion coefficient and strong covalent bond of B4C make it difficult to densify, and the material has poor fracture toughness (K IC <2.20MPa·m 1 / 2 ), and the electromagnetic wave loss mechanism of B4C is single and the impedance matching is poor, which limits its wide application.

[0004] Currently, the introduction of secondary phases such as carbides, borides, and graphene is the primary method for improving the mechanical properties of B4C ceramics. For example, in B4C-HfB2 and B4C-W2B5 composites, residual stresses generated by the thermal expansion coefficient mismatch between B4C and the secondary phase during high-temperature cooling can effectively increase crack deflection and crack bridging during fracture, thereby improving fracture toughness. However, relatively little research has been conducted on the electromagnetic wave absorption properties of B4C.

[0005] Therefore, how to improve the mechanical properties of B4C while improving its electromagnetic wave absorption performance and realize the integrated stealth protection of B4C composite materials is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a high-strength and toughness wave-absorbing composite material and its preparation method and application to meet the new requirements of modern warfare for armor materials.

[0007] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0008] A high-strength and tough wave-absorbing composite material, the high-strength and tough wave-absorbing composite material is B4C-(Ti x Cr 1-x )B2-graphite;B4C-(Ti x Cr 1-x )B2-graphite, (Ti x Cr 1-x )The content of B2 is 20 vol.% (volume percentage), and 0.48≤x≤0.89.

[0009] The present invention also provides a method for preparing a high-strength and tough wave-absorbing composite material, comprising the following steps:

[0010] S1. Weigh the following raw materials according to the following mass percentages: 69.54-72.35 wt.% (mass percentage) of B4C, 13.11-24.11 wt.% of TiC, and 3.54-17.35 wt.% of CrB2; and mix the raw materials uniformly to obtain a mixed powder.

[0011] S2, placing the mixed powder in a mold for hot pressing and sintering, the sintering temperature of hot pressing and sintering is 1800-2000℃, the sintering pressure of hot pressing and sintering is 20-60MPa, and the mixture is kept at the sintering temperature for 1-3h; after sintering, the mixture is cooled to obtain a high-strength and tough absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite (also known as B4C-(Ti x Cr 1-x )B2-graphite composite material).

[0012] Preferably, in step S1, the purity of B4C is 99.9% and the particle size is 0.5 μm; the purity of TiC is 99.5% and the particle size is 1-2 μm; the purity of CrB2 is 99.5% and the particle size is 1-2 μm.

[0013] Preferably, in step S1, the mixing process of the raw materials is: adding the raw materials to anhydrous ethanol and then ball milling to obtain a suspension; and rotary evaporating the suspension and grinding and sieving to obtain a mixed powder.

[0014] Preferably, in step S1, the mass ratio of anhydrous ethanol to raw material is (1-2):1, the mass ratio of balls to materials in the ball milling process is (1-3):1, the ball milling speed is 60-120 r / min, and the ball milling time is 12-24 h.

[0015] Further preferably, in step S1, the mass ratio of anhydrous ethanol to raw material is 1.4:1, the ball-to-material mass ratio in the ball milling process is 2:1, the ball milling speed is 90 r / min, and the ball milling time is 12 h.

[0016] Preferably, in step S1, a polytetrafluoroethylene ball milling jar is used in the ball milling process, and zirconium oxide ball milling balls are used as ball milling media.

[0017] Specifically, a drum ball mill is used for ball milling.

[0018] Preferably, in step S1, the suspension is dried by rotary evaporation at 40-55° C. for 0.5-2 h; and a 200-mesh sieve is used during sieving.

[0019] Further preferably, in step S1, the suspension is dried by rotary evaporation at 50° C. for 0.5 h.

[0020] Preferably, in step S2, the heating rate of hot pressing sintering is: when the temperature is raised from room temperature to 1000°C, the heating rate is 10°C / min; when the temperature is raised from 1000°C to 1600°C, the heating rate is 8°C / min; when the temperature is raised from 1600°C to the sintering temperature, the heating rate is 5°C / min.

[0021] Further preferably, in step S2, the sintering temperature of the hot pressing sintering is 1900° C., the sintering pressure is 60 MPa, and the holding time is 1 hour.

[0022] Preferably, in step S2, the mold is a graphite mold; and the sintering environment is a vacuum environment or an inert atmosphere.

[0023] The present invention also includes the use of the high-strength and toughness wave-absorbing composite material or the high-strength and toughness wave-absorbing composite material prepared by the above preparation method in bullet-proof materials.

[0024] Working principle:

[0025] (1) The present invention uses B4C powder, TiC powder, and CrB2 powder as raw materials, and utilizes reaction hot pressing sintering to prepare (Ti x Cr 1-x )B4C-(Ti x Cr 1-x )B2-graphite composite material can effectively improve B4C-(Ti x Cr 1-x )B2-graphite composite material mechanical properties and electromagnetic wave absorption properties. These effects are mainly due to the addition ratio of TiC and CrB2 in the raw materials and the process of reaction hot pressing sintering. When TiC and CrB2 are added to B4C, a reaction occurs during the sintering process to generate (Ti x Cr 1-x )B2 and graphite, (Ti x Cr 1-x)B2 and graphite form a nested structure.

[0026] First, TiC was introduced to form (Ti x Cr 1-x )B2 solid solution, by adjusting the ratio of TiC and CrB2 to form (Ti x Cr 1-x )B2 solid solution, on the one hand (Ti x Cr 1-x )B2 lattice distortion can increase the internal stress of the material, hinder the dislocation movement and achieve solid solution strengthening, thereby regulating the B4C-(Ti x Cr 1-x )B2-graphite composite mechanical properties, on the other hand (Ti x Cr 1-x The large number of defects formed by )B2 enhance the dipole polarization, which can absorb electromagnetic waves more effectively, thereby broadening the effective absorption bandwidth.

[0027] Secondly, graphite and (Ti x Cr 1-x )B2 forms a nested structure and is compounded with B4C. Graphite has good energy absorption capacity. When the crack expands to the nested structure, it can absorb and dissipate part of the crack expansion energy, thereby improving the B4C-(Ti x Cr 1-x )B2-graphite composite material has a toughness, and more interfaces are formed, the interface polarization is increased, the effective absorption bandwidth of the material is increased, and the electromagnetic wave absorption performance with broadband strong absorption is achieved. The final prepared B4C-(Ti x Cr 1-x The flexural strength of B2-graphite composite materials is 415.54-575.94 MPa and the fracture toughness is 4.98-6.17 MPa·m 1 / 2 When the fitting thickness is 1.2 mm, the reflection loss value reaches -43.59 dB, and the effective absorption bandwidth is as high as 3.60 GHz. Therefore, the high-strength and tough absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite, which has both excellent mechanical properties and electromagnetic wave absorption properties.

[0028] (2) The B4C-(Ti x Cr 1-x )B2-graphite composite material has the advantages of high fracture toughness, high bending strength and strong wave absorption performance, and has good repeatability, simple steps and is easy to implement.

[0029] Beneficial effects:

[0030] The present invention adopts B4C powder, TiC powder and CrB2 powder as raw materials, and utilizes reaction hot pressing sintering to prepare (Ti x Cr 1-x )B4C-(Ti x Cr 1-x )B2-graphite composite material can effectively improve B4C-(Ti x Cr 1-x )B2-graphite composite material mechanical properties and electromagnetic wave absorption properties. The present invention is prepared by hot pressing sintering B4C-(Ti x Cr 1-x )B2-graphite composite material has the advantages of high fracture toughness, high bending strength and strong wave absorption performance, and has good repeatability, simple steps and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x ) XRD pattern of B2-graphite;

[0032] Figure 2 The high-strength and tough wave-absorbing composite material B4C-(Ti 0.58 Cr 0.42 ) SEM image of the B2-graphite fracture surface;

[0033] Figure 3 The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite fracture toughness and flexural strength data;

[0034] Figure 4 The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x )Reflection loss curve of the best matching thickness of B2-graphite. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] There is no particular limitation on the purity of all raw materials in the present invention. The present invention preferably uses industrial purity or conventional purity used in the art.

[0037] The devices used in the present invention are not particularly limited and can be devices commonly used in the art.

[0038] In the following examples, B4C powder, TiC powder, and CrB2 powder are all commercially available. Volume percentages are calculated based on the theoretical volume obtained by converting mass to theoretical density.

[0039] The B4C powder used in the following examples was purchased from Zhengzhou Songshan Boron Industry Technology Co., Ltd., with an average particle size of 0.5 μm and a purity of 99.9%; the TiC powder used was purchased from Beijing Huawei Ruike Chemical Co., Ltd., with a particle size of 1-2 μm and a purity of 99.5%; the CrB2 powder used was purchased from Shanghai Titan Technology Co., Ltd., with a particle size of 1-2 μm and a purity of 99.5%.

[0040] Example 1

[0041] A method for preparing a high-strength and tough wave-absorbing composite material comprises the following steps:

[0042] (1) 72.35 wt.% B4C powder, 24.11 wt.% TiC powder, and 3.54 wt.% CrB2 powder were weighed as raw materials and placed in a polytetrafluoroethylene ball mill. Anhydrous ethanol was added and roller milling was performed using zirconia balls as the milling medium until the slurry was milled into a uniform suspension. The mass ratio of anhydrous ethanol to raw materials was 1:1, and the mass ratio of balls to materials was 1:1. The milling speed was 90 r / min and the milling time was 12 h. After the milling, the suspension was separated from the zirconia balls and dried using a rotary evaporator for 0.5 h at 40°C. The dried mixed powder was sieved through a 200-mesh sieve and set aside.

[0043] (2) Place the mixed powder in a graphite mold and sinter it in a hot pressing furnace. Heat the mixture from room temperature to 1000°C at 10°C / min, then heat it to 1600°C at 8°C / min, and then heat it to 1900°C at 5°C / min and keep it for 1 hour at a pressure of 60 MPa. After sintering, cool it in the furnace, remove the mold, and separate the sintered body from the mold to obtain a high-strength and toughness absorbing composite material B4C-(Ti 0.89 Cr 0.11 )B2-graphite, denoted as T 0.89 C 0.11 .

[0044] After testing, the high-strength and tough wave-absorbing composite material T prepared in this embodiment 0.89 C 0.11The bending strength is 524MPa and the fracture toughness is 4.98MPa·m 1 / 2 The minimum reflection loss in the frequency range of 2-18GHz is -32.02dB (8.08GHz, 3.2mm), and the effective absorption bandwidth is 2.88GHz (3.2mm).

[0045] Example 2

[0046] A method for preparing a high-strength and tough wave-absorbing composite material comprises the following steps:

[0047] (1) 71.64 wt.% B4C powder, 21.31 wt.% TiC powder, and 7.05 wt.% CrB2 powder were weighed as raw materials and placed in a polytetrafluoroethylene ball mill. Anhydrous ethanol was added and roller milling was performed using zirconia balls as the milling medium until the slurry was milled into a uniform suspension. The mass ratio of anhydrous ethanol to raw materials was 2:1, and the mass ratio of balls to materials was 3:1. The milling speed was 120 r / min and the milling time was 24 h. After the milling, the suspension was separated from the zirconia balls and dried using a rotary evaporator for 1.5 h at 55°C. The dried mixed powder was sieved through a 200-mesh sieve and set aside.

[0048] (2) Place the mixed powder in a graphite mold and sinter it in a hot pressing furnace. Heat the mixture from room temperature to 1000°C at 10°C / min, then heat it to 1600°C at 8°C / min, and then heat it to 1900°C at 5°C / min and keep it for 1 hour at a pressure of 60 MPa. After sintering, cool it in the furnace, remove the mold, and separate the sintered body from the mold to obtain a high-strength and toughness absorbing composite material B4C-(Ti 0.79 Cr 0.21 )B2-graphite, denoted as T 0.79 C 0.21 .

[0049] After testing, the high-strength and tough wave-absorbing composite material T prepared in this embodiment 0.79 C 0.21 The bending strength is 575MPa and the fracture toughness is 6.17MPa·m 1 / 2 The minimum reflection loss in the frequency range of 2-18GHz is -33.26dB (8.64GHz, 3.0mm), and the effective absorption bandwidth is 4.80GHz (3.0mm).

[0050] Example 3

[0051] A method for preparing a high-strength and tough wave-absorbing composite material comprises the following steps:

[0052] (1) 70.93 wt.% B4C powder, 18.55 wt.% TiC powder, and 10.52 wt.% CrB2 powder were weighed as raw materials and placed in a polytetrafluoroethylene ball mill. Anhydrous ethanol was added and roller milling was performed using zirconia balls as the milling medium until the slurry was milled into a uniform suspension. The mass ratio of anhydrous ethanol to raw materials was 1.3:1, and the mass ratio of balls to materials was 1.5:1. The milling speed was 95 r / min and the milling time was 15 h. After the milling, the suspension was separated from the zirconia balls and dried using a rotary evaporator for 1 h at 45°C. The dried mixed powder was sieved through a 200-mesh sieve and set aside.

[0053] (2) Place the mixed powder in a graphite mold and sinter it in a hot pressing furnace. Heat the mixture from room temperature to 1000°C at 10°C / min, then heat it to 1600°C at 8°C / min, and then heat it to 1850°C at 5°C / min and keep it for 1 hour at a pressure of 60 MPa. After sintering, cool it in the furnace, remove the mold, and separate the sintered body from the mold to obtain a high-strength and toughness absorbing composite material B4C-(Ti 0.68 Cr 0.32 )B2-graphite, denoted as T 0.68 C 0.32 .

[0054] After testing, the high-strength and tough wave-absorbing composite material T prepared in this embodiment 0.68 C 0.32 The bending strength is 518MPa and the fracture toughness is 5.38MPa·m 1 / 2 The minimum reflection loss in the frequency range of 2-18GHz is -29.56dB (9.04GHz, 2.8mm), and the effective absorption bandwidth is 5.84GHz (2.8mm).

[0055] Example 4

[0056] A method for preparing a high-strength and tough wave-absorbing composite material comprises the following steps:

[0057] (1) Weigh 70.23wt.% B4C powder, 15.82wt.% TiC powder, and 13.95wt.% CrB2 powder as raw materials, place the powders in a polytetrafluoroethylene ball mill in sequence, add anhydrous ethanol, and use zirconium oxide ball milling balls as the ball milling medium for roller milling until the slurry is ball milled into a uniform suspension. The mass ratio of anhydrous ethanol to raw materials is 1.8:1, and the mass ratio of balls to materials is 2.5:1; the ball milling speed is 105r / min, and the ball milling time is 21h. After the ball milling is completed, the suspension is separated from the zirconium oxide ball milling balls, and then the suspension is dried using a rotary evaporator for 0.5h at a drying temperature of 50°C; the dried mixed powder is sieved through a 200-mesh sieve for later use;

[0058] (2) Place the mixed powder in a graphite mold and sinter it in a hot pressing furnace. Heat the mixture from room temperature to 1000°C at 10°C / min, then heat it to 1600°C at 8°C / min, then heat it to 1900°C at 5°C / min and keep it warm for 2 hours at a pressure of 60 MPa. After sintering, cool it in the furnace, remove the mold, and separate the sintered body from the mold to obtain a high-strength and toughness absorbing composite material B4C-(Ti 0.58 Cr 0.42 )B2-graphite, denoted as T 0.58 C 0.42 .

[0059] After testing, the high-strength and tough wave-absorbing composite material T prepared in this embodiment 0.58 C 0.42 The bending strength is 458.14MPa and the fracture toughness is 5.19MPa·m 1 / 2 The minimum reflection loss in the frequency range of 2-18GHz is -42.59dB (9.20GHz, 2.5mm), and the effective absorption bandwidth is 6.56GHz (2.6mm).

[0060] Example 5

[0061] A method for preparing a high-strength and tough wave-absorbing composite material comprises the following steps:

[0062] (1) Weigh 69.54wt.% B4C powder, 13.11wt.% TiC powder, and 17.35wt.% CrB2 powder as raw materials, place the powders in a polytetrafluoroethylene ball mill in sequence, add anhydrous ethanol, and use zirconium oxide ball milling balls as the ball milling medium for roller milling until the slurry is ball milled into a uniform suspension. The mass ratio of anhydrous ethanol to raw materials is 1.5:1, and the mass ratio of balls to materials is 2:1; the ball milling speed is 100r / min, and the ball milling time is 18h. After the ball milling is completed, the suspension is separated from the zirconium oxide ball milling balls, and then the suspension is dried using a rotary evaporator for 1h at a drying temperature of 55°C; the dried mixed powder is sieved through a 200-mesh sieve for later use;

[0063] (2) Place the mixed powder in a graphite mold and sinter it in a hot pressing furnace. Heat the mixture from room temperature to 1000°C at 10°C / min, then heat it to 1600°C at 8°C / min, then heat it to 1900°C at 5°C / min and keep it warm for 1 hour at a pressure of 60 MPa. After sintering, cool it in the furnace, remove the mold, and separate the sintered body from the mold to obtain a high-strength and toughness absorbing composite material B4C-(Ti 0.48 Cr 0.52 )B2-graphite, denoted as T 0.48 C 0.52 .

[0064] After testing, the high-strength and tough wave-absorbing composite material T prepared in this embodiment 0.48 C 0.52 The bending strength is 415MPa and the fracture toughness is 5.02MPa·m 1 / 2 The minimum reflection loss in the frequency range of 2-18GHz is -28.84dB (9.44GHz, 2.6mm), and the effective absorption bandwidth is 7.36GHz (2.7mm).

[0065] The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite was subjected to XRD test, and the results were as follows Figure 1 As shown in the figure, the components of the high strength and toughness absorbing composite material prepared by this method are B4C, (Ti x Cr 1-x )B2, graphite.

[0066] The high-strength and tough wave-absorbing composite material T prepared in Example 4 0.58 C 0.42 The fracture surface was tested by SEM, and the test results were as follows: Figure 2 As shown, the results show that the generated (Ti 0.58 Cr 0.42)B2 and graphite form a nested structure. x Cr 1-x )B2 can improve the B4C-(Ti x Cr 1-x )B2-graphite composite material's flexural strength, graphite can absorb and dissipate part of the crack propagation energy, thereby improving the B4C-(Ti x Cr 1-x )Toughness of B2-graphite composites.

[0067] The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite fracture toughness and bending strength were tested, and the test results are as follows Figure 3 As shown in the figure, it is known that by adjusting the addition ratio of TiC and CrB2, it can be seen that the introduction of a certain amount of Cr can improve the high strength and toughness of the absorbing composite material B4C-(Ti x Cr 1-x )Fracture toughness and flexural strength of B2-graphite.

[0068] The high-strength and tough wave-absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite was tested for electromagnetic wave absorption performance and plotted Figure 4 The reflection loss curves of the best matching thickness of Examples 1-5 are shown. It can be seen that the high strength and toughness absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite has certain electromagnetic wave absorption performance. By adjusting the addition ratio of TiC and CrB2, it can be seen that with the increase of Cr content, the effective absorption bandwidth with reflection loss below -10dB gradually increases. (Ti x Cr 1-x )B2 forms a large number of defects that enhance the dipole polarization, and (Ti x Cr 1-x )B2-graphite nested structure forms more interfaces ( Figure 2 ), enhance the interface polarization, can more effectively absorb electromagnetic waves, proved that the adjustment of TiC and CrB2 addition ratio can increase the B4C-(Ti x Cr 1-x )B2-graphite composite material has an effective absorption bandwidth, which greatly improves the B4C-(Ti x Cr 1-x )Electromagnetic wave absorption properties of B2-graphite composite materials.

[0069] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A high-strength and tough wave-absorbing composite material, characterized by: Using B4C powder, TiC powder, CrB2 powder as raw materials, the reaction hot pressing sintering was used to prepare (Ti x Cr 1-x )B4C-(Ti x Cr 1-x )B2-graphite composite material; B4C-(Ti x Cr 1-x )B2-graphite, (Ti x Cr 1-x ) The content of B2 is 20 vol.%, and 0.48≤x≤0.

89.

2. A method for preparing the high-strength and tough wave-absorbing composite material according to claim 1, characterized in that: The following steps are involved: S1. Weigh the following raw materials according to the following mass percentages: 69.54-72.35 wt.% of B4C, 13.11-24.11 wt.% of TiC, and 3.54-17.35 wt.% of CrB2; and mix the raw materials uniformly to obtain a mixed powder. S2, placing the mixed powder in a mold for hot pressing sintering, the sintering temperature of hot pressing sintering is 1800-2000 ℃, the sintering pressure of hot pressing sintering is 20-60 MPa, and the mixture is kept at the sintering temperature for 1-3 hours; after sintering, the mixture is cooled to obtain a high-strength and tough absorbing composite material B4C-(Ti x Cr 1-x )B2-graphite.

3. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 2, wherein: In step S1, the purity of B4C is 99.9% and the particle size is 0.5 μm; The purity of TiC is 99.5%, and the particle size is 1-2 μm; the purity of CrB2 is 99.5%, and the particle size is 1-2 μm.

4. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 2, wherein: In step S1, the raw materials are mixed as follows: the raw materials are added to anhydrous ethanol and then ball-milled to obtain a suspension; the suspension is rotary evaporated, ground and sieved to obtain a mixed powder.

5. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 4, wherein: In step S1, the mass ratio of anhydrous ethanol to raw material is (1-2):1, the mass ratio of balls to materials in the ball milling process is (1-3):1, the ball milling speed is 60-120 r / min, and the ball milling time is 12-24 h.

6. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 4, characterized in that: In the step S1, a polytetrafluoroethylene ball milling jar is used in the ball milling process, and zirconium oxide ball milling balls are used as ball milling media.

7. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 4, wherein: In step S1, the suspension is dried by rotary evaporation at 40-55° C. for 0.5-2 h; and a 200-mesh sieve is used during sieving.

8. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 2, wherein: In step S2, the heating rate of hot pressing sintering is: when the temperature is raised from room temperature to 1000°C, the heating rate is 10°C / min; when the temperature is raised from 1000°C to 1600°C, the heating rate is 8°C / min; when the temperature is raised from 1600°C to the sintering temperature, the heating rate is 5°C / min.

9. The method for preparing a high-strength and tough wave-absorbing composite material according to claim 2, wherein: In step S2, the mold is a graphite mold; and the sintering environment is a vacuum environment or an inert atmosphere.

10. Use of the high-strength and toughness absorbing composite material according to claim 1 or the high-strength and toughness absorbing composite material prepared by the preparation method according to any one of claims 2 to 9 in bulletproof materials.

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