A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material and its preparation method

Abstract

This invention belongs to the field of microwave absorbing composite materials technology, and relates to a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material and its preparation method, the composite material is FeSiCr@Ni 0.5 Zn 0.5 A mixture of Fe2O4@PUA and PEEK; FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA is FeSiCr@Ni 0.5 Zn 0.5 Fe2O4 composite nanoparticles are grafted with a layer of PUA polymer on their surface; FeSiCr@Ni 0.5 Zn 0.5 Fe₂O₄ has a core-shell structure: the core is FeSiCr, and the shell is composed of Ni. 0.5 Zn 0.5 The composite material of this invention is composed of Fe2O4 particles; it has a low peak reflection loss, a wide effective absorption bandwidth, stable wave absorption performance in a wide temperature range, strong resistance to water vapor erosion, and a simple and controllable preparation process that is easy to scale up.

Description

Technical Field

[0001] This invention belongs to the field of microwave absorbing composite materials technology, specifically relating to a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material and its preparation method. Background Technology

[0002] The rapid development of electromagnetic radiation pollution and electromagnetic stealth technology has placed stringent demands on the comprehensive performance of microwave absorbing materials. These materials must simultaneously possess core characteristics such as strong absorption capacity, wide absorption bandwidth, and lightweight design. Furthermore, they must withstand complex service environments, such as extreme temperature fluctuations and high humidity corrosion, to meet the application needs of aerospace, military equipment, 5G communications, and high-temperature electronic equipment.

[0003] Magnetic absorbing materials are among the most widely used microwave absorbing systems, mainly including two categories: metallic magnetic alloys and ferrites. FeSiCr alloys, due to their high saturation magnetization, excellent magnetic loss capability, and good mechanical properties, have become ideal magnetic loss-type absorbing fillers; Ni... 0.5 Zn 0.5 Fe2O4 ferrite possesses both dielectric and magnetic loss properties, and its oxidation resistance is superior to that of pure metals. The combination of the two can improve the microwave absorption performance through the magnetic-dielectric synergistic loss effect.

[0004] To further optimize the microwave absorption performance and environmental stability of magnetic fillers, core-shell structure design is a commonly used modification strategy. Using FeSiCr as the core and Ni... 0.5 Zn 0.5 The core-shell structured filler with Fe2O4 as the shell can utilize the high magnetic loss of the FeSiCr core and also benefit from the Ni core. 0.5 Zn 0.5 The Fe2O4 shell can regulate the dielectric constant, improve the oxidation resistance of the filler, and enhance the microwave absorption capability through interfacial polarization. However, the existing preparation processes of FeSiCr@ferrite core-shell fillers generally suffer from problems such as uneven shell coating and weak interfacial bonding, which makes the composite material prone to interfacial cracking during temperature cycling and significantly reduces the stability of microwave absorption performance.

[0005] The choice of polymer matrix directly determines the molding processability and service stability of microwave absorbing composite materials. Polyetheretherketone (PEEK) is a high-performance engineering plastic with excellent heat resistance (glass transition temperature of approximately 143 °C, melting point of approximately 343 °C), corrosion resistance, mechanical properties, and dimensional stability, making it an ideal matrix for preparing wide-temperature-range microwave absorbing composite materials. However, pure PEEK is an insulating material with extremely poor microwave absorption performance. Furthermore, combining magnetic fillers with PEEK presents two key challenges: first, poor interfacial compatibility between the magnetic filler and the PEEK matrix, leading to filler agglomeration, decreased mechanical properties of the composite material, and difficulty in achieving uniform impedance matching; second, insufficient hydrophobic design in existing PEEK-based magnetic microwave absorbing composite materials, allowing moisture to easily penetrate the interior when the material is in operation in a humid environment, damaging the filler-matrix interface and triggering corrosion and oxidation of the metal filler, resulting in a sharp decline in microwave absorption performance and structural stability.

[0006] Current research on FeSiCr / ferrite-polymer microwave absorbing composites, both domestically and internationally, mainly focuses on improving microwave absorption performance, with insufficient attention paid to the synergistic optimization of wide-temperature stability and hydrophobicity. Most composites only maintain good microwave absorption performance at room temperature. When the temperature fluctuates within a wide range of -50℃ to 200℃, the mismatch in thermal expansion coefficients between the filler and the matrix leads to interfacial stress concentration, microcrack initiation, and irreversible changes in magnetic permeability and dielectric constant. Simultaneously, the hydrophilic nature of the material surface significantly shortens its service life in high-humidity environments. Furthermore, existing preparation processes struggle to achieve uniform dispersion of the core-shell filler and synergistic control of interfacial modification and matrix forming, limiting the practical application of composites in complex and extreme environments.

[0007] In summary, a FeSiCr@Ni alloy with wide-temperature-range microwave absorption stability, excellent hydrophobicity, and high microwave absorption efficiency has been developed. 0.5 Zn 0.5 Fe2O4-PEEK composite materials address the performance degradation problem of existing materials under extreme temperature and high humidity environments, which is of great significance for promoting the application of microwave absorbing materials in aerospace, high-end equipment and other fields. Summary of the Invention

[0008] This invention provides the following technical solution: a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material, the composite material is FeSiCr@Ni 0.5 Zn 0.5 A mixture of Fe2O4@PUA and PEEK.

[0009] FeSiCr@Ni 0.5 Zn 0.5Fe2O4@PUA is FeSiCr@Ni 0.5 Zn 0.5 A layer of PUA polymer is grafted onto the surface of the Fe2O4 composite nanoparticles.

[0010] FeSiCr@Ni 0.5 Zn 0.5 Fe₂O₄ has a core-shell structure: the core is FeSiCr, and the shell is composed of Ni. 0.5 Zn 0.5 The composition is Fe2O4 particles; among which, FeSiCr@Ni 0.5 Zn 0.5 The mixing ratio of Fe2O4@PUA and PEEK is 25~27:75~80 by weight.

[0011] Preferably, the FeSiCr@Ni 0.5 Zn 0.5 The mixing ratio of Fe2O4@PUA and PEEK is 1:3 by weight.

[0012] This invention also discloses a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 A method for preparing Fe2O4@PUA-PEEK composite material, the method comprising the following steps: Step 1: Ball milling of FeSiCr to prepare flattened flake-shaped FeSiCr powder.

[0013] Step 2: Coat the surface of the FeSiCr flake powder obtained in Step 1 with Ni by combustion method. 0.5 Zn 0.5 Fe2O4.

[0014] Step 3: The Ni obtained in Step 2 0.5 Zn 0.5 Fe2O4-coated FeSiCr followed by annealing yields FeSiCr@Ni with higher crystallinity. 0.5 Zn 0.5 Fe2O4.

[0015] Step 4: Using hydroxyl acrylic resin as a prepolymer and hexamethylene diisocyanate trimer as a curing agent, FeSiCr@Ni 0.5 Zn 0.5 A layer of PUA is grafted onto the surface of Fe2O4 to obtain FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA.

[0016] Step 5: Apply FeSiCr@Ni 0.5Zn 0.5 Fe2O4@PUA and PEEK powders were mixed in a certain proportion and then ground to prepare FeSiCr@Ni 0.5 Zn 0.5 Fe2O4-PEEK composite material.

[0017] Preferably, in step 1, the ratio of zirconium balls, FeSiCr raw powder, and deionized water is 100~110:10~12:10~12 by weight.

[0018] Preferably, step 2 specifically includes: taking Fe(NO3)3 9H2O, Zn(NO3)2 6H2O, Ni(NO3)2 6H2O and glycine were mixed and dissolved in deionized water until completely dissolved. Then, the FeSiCr flake powder prepared in step 1 was added and magnetically stirred. After washing thoroughly with deionized water three times, the mixture was filtered by vacuum pump and the composite precipitate was dried.

[0019] More preferably, the Fe(NO3)3 9H2O, Zn(NO3)2 6H2O, Ni(NO3)2 The weight ratio of 6H2O to glycine is 1.7~1.8:0.3~0.4:0.3~0.4:0.5~0.6.

[0020] More preferably, the dissolution temperature of the mixture is maintained at 60~80 ℃.

[0021] Preferably, in step 3, the calcination conditions for annealing are 800~820 ℃ for 1~1.2 h and the heating rate is 5 ℃ / min.

[0022] Preferably, in step 4, the hydroxyl acrylic resin, hexamethylene diisocyanate trimer, and FeSiCr@Ni 0.5 Zn 0.5 The weight ratio of Fe2O4 is 2.5~2.7:1~1.2:10~12.

[0023] Preferably, in step 4, the mixture prepared by magnetic separation using ethanol is dried overnight at 45-50°C, and FeSiCr@Ni is collected by washing and magnetic separation. 0.5 Zn 0.5 Fe2O4@PUA.

[0024] The beneficial effects of this invention are: The FeSiCr@Ni of the present invention 0.5 Zn 0.5Fe2O4@PUA-PEEK composite materials combine excellent microwave absorption properties, wide temperature range stability, and strong hydrophobicity, resulting in significant overall benefits. Core-shell structured FeSiCr@Ni... 0.5 Zn 0.5 Fe2O4@PUA filler can synergistically regulate dielectric and magnetic losses, achieving wideband and high-efficiency microwave absorption with low peak reflection loss and a broad effective absorption bandwidth. The PEEK matrix endows the material with excellent mechanical properties and resistance to high and low temperatures, enabling it to maintain stable microwave absorption performance over a wide temperature range, making it suitable for complex and extreme operating conditions. The hydrophobic interface constructed on the material surface can effectively resist water vapor erosion, significantly extending its service life. In addition, the preparation method of this invention is simple and controllable, with moderate raw material costs, and is easy to scale up for production, making it widely applicable to electromagnetic protection in aerospace, electronic equipment, and other fields. Attached Figure Description

[0025] Figure 1 This invention relates to a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Flowchart of Fe2O4@PUA-PEEK composite material and its preparation method; Figure 2 The image shows the XRD pattern of the composite material of this invention. Figure 3 The images shown are SEM images of the composite material and magnified SEM images of the composite material surface of the present invention; wherein (a) is the composite material and (b) is a magnified image of the composite material surface. Figure 4 The figures show a comparison of the hydrophilicity and hydrophobicity of the composite materials of the present invention; where (a) is FeSiCr and (b) is FeSiCr@Ni. 0.5 Zn 0.5 Fe2O4@PUA; Figure 5 The electromagnetic parameters of the composite material of the present invention are shown in the figure. Figure 6 The diagram shows the microwave absorption performance of the composite material of this invention. Figure 7 The figures show a comparison of RCS simulations of the composite material of this invention; where (a) is a blank simulation and (b) is the FeSiCr@Ni simulation. 0.5 Zn 0.5 Simulation of Fe2O4@PUA-PEEK composite materials; Figure 8 The graph shows the electromagnetic parameters of the composite material of the present invention at different temperatures; where (a) represents 150 degrees Celsius, (b) represents 200 degrees Celsius, and (c) represents 250 degrees Celsius. Figure 9 The graphs show the microwave absorption performance of the composite material of the present invention at different temperatures; where (a) represents 150 degrees Celsius, (b) represents 200 degrees Celsius, and (c) represents 250 degrees Celsius. Detailed Implementation

[0026] The relevant technologies of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] like Figures 1-9 As shown, this embodiment presents a wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 The preparation steps of the Fe2O4@PUA-PEEK composite material and its preparation method are as follows: Step 1: The FeSiCr flake powder is ball-milled using a high-efficiency planetary ball mill.

[0028] Step 2: Coat the prepared FeSiCr flake powder with Ni using a nanoscale combustion method. 0.5 Zn 0.5 Fe2O4.

[0029] Step 3: The Ni prepared in step 2... 0.5 Zn 0.5 Fe2O4-coated FeSiCr followed by annealing yields FeSiCr@Ni with higher crystallinity. 0.5 Zn 0.5 Fe2O4.

[0030] Step 4: Using hydroxyl acrylic resin as a prepolymer and hexamethylene diisocyanate trimer as a curing agent, FeSiCr@Ni 0.5 Zn 0.5 A layer of PUA is grafted onto the surface of Fe2O4 to obtain FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA.

[0031] Step 5: Weigh a certain amount of FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA and PEEK powders were mixed in a predetermined ratio and then thoroughly ground to successfully prepare FeSiCr@Ni. 0.5 Zn 0.5 FeSiCr@Ni composite material with a Fe2O4@PUA content of 25% and high electromagnetic wave absorption performance. 0.5 Zn 0.5 Fe2O4-PEEK.

[0032] Furthermore, the ratio of zirconium balls, FeSiCr raw powder, and deionized water is (100~110) g : (10~12) g : (10~12) g. The ball milling speed is (330~350) r / min, and the ball milling is continued for (10~12) h.

[0033] Furthermore, the combustion method yields (1.7~1.8) g of Fe(NO3)3. 9H2O, (0.3~0.4) g of Zn(NO3)2 6H2O, (0.3~0.4) g Ni(NO3)2 6H2O and (0.5~0.6) g of glycine were dissolved in (200~250) mL of deionized water.

[0034] Furthermore, the dissolution temperature was maintained at (60-80) ℃. After complete dissolution into a solution, (10~12) g of FeSiCr flake powder was added. The magnetic stirrer was used at a speed of (300~320) r / min and a temperature of (95~100) ℃ for (60~70) min. The mixture was thoroughly washed three times with deionized water, then filtered using a vacuum pump. The composite precipitate was then placed in an electric thermostatic drying oven and dried overnight at (60~65) ℃.

[0035] Furthermore, the annealing and calcination conditions were (800~820) ℃ for (1~1.2) h, with a heating rate of 5 ℃ / min. (10~12) g of FeSiCr@Ni 0.5 Zn 0.5 Fe2O4 and (1~1.2) g of hexamethylene diisocyanate trimer were added to a solution of (50~52) g of butyl acetate and (2.5~2.7) g of hydroxyl acrylic resin, and the mixture was treated in a water bath at (60~65) °C for (0.5~1) h under high-speed dispersant conditions.

[0036] Furthermore, FeSiCr@Ni was collected by magnetic separation using ethanol, dried overnight at (45~50) °C, and then collected by washing and magnetic separation six times. 0.5 Zn 0.5 Fe2O4@PUA.

[0037] FeSiCr@Ni was collected by magnetic separation using ethanol, dried overnight at (45~50) ℃, and then collected by washing and magnetic separation six times. 0.5 Zn 0.5 Fe2O4@PUA.

[0038] Further, weigh (25~27) g of FeSiCr@Ni 0.5 Zn0.5 Fe2O4@PUA and (75~80) g of PEEK powder were mixed in a predetermined ratio and then ground thoroughly.

[0039] Example The ferric nitrate nonahydrate (Fe(NO3)3) used in this embodiment (9H2O) was purchased from Aladdin; nickel nitrate hexahydrate (Ni(NO3)2) 6H2O), zinc nitrate hexahydrate (Zn(NO3)2) 6H2O was purchased from Sinopharm Group; glycine (NH2CH2COOH) was purchased from Xinhengyan; hydroxyl acrylic resin (HA) was purchased from Aohui Paint; hexamethylene diisocyanate trimer (N3390) was purchased from Acmec; butyl acetate (BA) was purchased from Macklin; FeSiCr was purchased from Changsha Tianjiu Metal Materials Co., Ltd.; PEEK material was supplied by Vickrex Ltd., UK.

[0040] The wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni described in this invention 0.5 Zn 0.5 The preparation method of Fe2O4@PUA-PEEK composite material includes the following steps: Preparation of FeSiCr flake powder: In this invention, zirconium balls, FeSiCr raw powder, and deionized water are poured into a vertical ball mill jar and ball-milled using a high-efficiency planetary ball mill. After the set time, the ball-milled powder is poured into a crystallizing dish and placed in an oven for drying. After the powder is completely dry, it is further ground using an agate mortar. Finally, the powder is passed through a 200-mesh sieve to remove large particulate impurities, resulting in flattened FeSiCr.

[0041] In this step, the ratio of zirconium balls, FeSiCr raw powder and deionized water is (100~110) g: (10~12) g: (10~12) g.

[0042] In this step, the ball milling speed is (330~350) r / min, and the ball milling is continued for (10~12) h.

[0043] Ni combustion method 0.5 Zn 0.5 Preparation of Fe2O4-coated FeSiCr flake powder: Fe(NO3)3 with different mass ratios was calculated. 9H2O, Zn(NO3)2 6H2O, Ni(NO3)2 6H2O(Zn 2+ Ni 2+A mixture of 0.5:0.5 glycine (glycine, nickel nitrate, and ferric nitrate in a 1:2 ratio) and deionized water was dissolved until completely dissolved. Then, FeSiCr flake powder was added and stirred with a magnetic stirrer. The mixture was washed three times thoroughly with deionized water, filtered using a vacuum pump, and the composite precipitate was dried in a thermostatic drying oven. Finally, annealing was performed to obtain Ni prepared by the combustion method. 0.5 Zn 0.5 Fe2O4 coated FeSiCr flake powder samples In this step, Fe(NO3)3 has a mass of (1.7~1.8) g. 9H2O, (0.3~0.4) g of Zn(NO3)2 6H2O, (0.3~0.4) g Ni(NO3)2 6H2O and (0.5~0.6) g of glycine were dissolved in (200~250) mL of deionized water.

[0044] In this step, the dissolution temperature is maintained at (60-80) ℃.

[0045] In this step, after completely dissolving into a solution, add (10~12) g of FeSiCr flake powder.

[0046] In this step, the magnetic stirrer is used at a speed of (300~320) r / min and a temperature of (95~100) ℃, and is maintained for (60~70) min.

[0047] In this step, the sample is thoroughly washed three times with deionized water, then filtered using a vacuum pump. The composite precipitate is then placed in an electric thermostatic drying oven and dried overnight at a temperature of (60~65) ℃.

[0048] In this step, the annealing and calcination conditions are (800~820) ℃ for (1~1.2) h, and the heating rate is 5 ℃ / min, to obtain FeSiCr@Ni. 0.5 Zn 0.5 Fe2O4.

[0049] FeSiCr@Ni 0.5 Zn 0.5 Preparation of Fe2O4@PUA: FeSiCr@Ni 0.5 Zn 0.5 Fe₂O₄ and N₃390 were added to a solution of BA and HA, and the mixture was treated in a water bath with a high-speed dispersant. Then, FeSiCr@Ni was collected by magnetic separation using ethanol, dried overnight, and subjected to six magnetic separations followed by washing. 0.5 Zn 0.5 Fe2O4@PUA In this step, (10~12) g of FeSiCr@Ni 0.5 Zn 0.5 Fe2O4 and (1~1.2) g of hexamethylene diisocyanate (HDI) trimer were added to a solution of (50~52) g of butyl acetate and (2.5~2.7) g of hydroxyl acrylic resin, and the mixture was treated in a water bath at (60~65) °C for (0.5~1) h under high-speed dispersant conditions.

[0050] In this step, dry overnight at (45~50) ℃.

[0051] 25% FeSiCr@Ni 0.5 Zn 0.5 Preparation of Fe2O4@PUA-PEEK composite material: A certain amount of SG@PUA-5 and PEEK powder were weighed, mixed in a predetermined ratio, and then ground thoroughly. A composite material with SG@PUA-5 mass fraction of 25% and high electromagnetic wave absorption performance was successfully prepared.

[0052] In this step, weigh (25~27) g of FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA and (75~80) g of PEEK powder.

[0053] In summary, this invention provides an innovative, wide-temperature-range hydrophobic, high-efficiency microwave-absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material and its preparation method. This invention features meticulous planning from material design to preparation process, achieving optimized material properties through unique steps and precise parameter control.

[0054] In terms of materials design, the core-shell structure of FeSiCr@Ni 0.5 Zn 0.5 The combination of Fe2O4@PUA filler and PEEK matrix is ​​a major highlight. This combination not only makes the material exhibit excellent microwave absorption performance, synergistically controlling dielectric and magnetic losses to achieve broadband and efficient microwave absorption, but also endows the material with superior mechanical properties, resistance to high and low temperatures, and strong hydrophobicity. This means that the material can operate stably under complex and extreme conditions and effectively resist water vapor erosion, greatly extending its service life.

[0055] In terms of preparation method, this invention has advantages such as simplicity, controllability, and moderate raw material cost. From ball milling of FeSiCr flake powder to Ni... 0.5 Zn 0.5From Fe2O4 coating and annealing to PUA grafting and the final preparation of composite materials, each step has a clear parameter range, making it easy to operate and control, thus enabling large-scale production.

[0056] The material of this invention can be widely used for electromagnetic protection in aerospace, electronic equipment, and other fields. In the aerospace field, the complex electromagnetic environment and extreme temperature conditions place extremely high demands on the performance of materials. The composite material of this invention, with its wide temperature range stability and high-efficiency wave absorption performance, can effectively reduce electromagnetic interference and ensure the normal operation of equipment. In the field of electronic equipment, with the continuous development of electronic technology, electromagnetic compatibility issues are becoming increasingly prominent. The strong hydrophobicity and high-efficiency wave absorption performance of this composite material can improve the reliability and stability of electronic equipment.

[0057] This invention has significant application value and broad market prospects in the fields of materials science and electromagnetic protection, and is expected to bring new breakthroughs and changes to the development of related fields.

[0058] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material, characterized in that, The composite material is FeSiCr@Ni 0.5 Zn 0.5 A mixture of Fe2O4@PUA and PEEK; The FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA is FeSiCr@Ni 0.5 Zn 0.5 A layer of PUA polymer is grafted onto the surface of Fe2O4 composite nanoparticles; The FeSiCr@Ni 0.5 Zn 0.5 Fe₂O₄ has a core-shell structure: the core is FeSiCr, and the shell is composed of Ni. 0.5 Zn 0.5 Composition of Fe2O4 particles; Among them, FeSiCr@Ni 0.5 Zn 0.5 The mixing ratio of Fe2O4@PUA and PEEK is 25~27:75~80 by weight.

2. The wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 1 0.5 Zn 0.5 Fe2O4@PUA-PEEK composite material, characterized in that, The FeSiCr@Ni 0.5 Zn 0.5 The mixing ratio of Fe2O4@PUA and PEEK is 1:3 by weight.

3. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, The preparation method is used to prepare the composite material according to claim 1 or 2, and the preparation method includes the following steps: Step 1: Ball milling of FeSiCr to prepare flattened flake-shaped FeSiCr powder; Step 2: Coat the surface of the FeSiCr flake powder obtained in Step 1 with Ni by combustion method. 0.5 Zn 0.5 Fe2O4; Step 3: The Ni obtained in Step 2 0.5 Zn 0.5 Fe2O4-coated FeSiCr followed by annealing yields FeSiCr@Ni with higher crystallinity. 0.5 Zn 0.5 Fe2O4; Step 4: Using hydroxyl acrylic resin as a prepolymer and hexamethylene diisocyanate trimer as a curing agent, FeSiCr@Ni 0.5 Zn 0.5 A layer of PUA is grafted onto the surface of Fe2O4 to obtain FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA; Step 5: Apply FeSiCr@Ni 0.5 Zn 0.5 Fe2O4@PUA and PEEK powders were mixed in a certain proportion and then ground to prepare FeSiCr@Ni 0.5 Zn 0.5 Fe2O4-PEEK composite material.

4. The wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 3 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, In step 1, the ratio of zirconium balls, FeSiCr raw powder and deionized water is 100~110:10~12:10~12 by weight.

5. The wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 3 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, Step 2 specifically includes: [The following is a description of Fe(NO3)3] 9H2O, Zn(NO3)2 6H2O, Ni(NO3)2 6H2O and glycine were mixed and dissolved in deionized water until completely dissolved. Then, the FeSiCr flake powder prepared in step 1 was added and magnetically stirred. After washing thoroughly with deionized water three times, the mixture was filtered by vacuum pump and the composite precipitate was dried.

6. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 5 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, The Fe(NO3)3 9H2O, Zn(NO3)2 6H2O, Ni(NO3)2 The weight ratio of 6H2O to glycine is 1.7~1.8:0.3~0.4:0.3~0.4:0.5~0.

6.

7. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 5 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, The dissolution temperature of the mixture is maintained at 60~80℃.

8. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 3 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, In step 3, the calcination conditions for the annealing treatment are 800~820 ℃ for 1~1.2h, and the heating rate is 5 ℃ / min.

9. A wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 3 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, In step 4, hydroxyl acrylic resin, hexamethylene diisocyanate trimer, and FeSiCr@Ni 0.5 Zn 0.5 The weight ratio of Fe2O4 is 2.5~2.7:1~1.2:10~12.

10. The wide-temperature-range hydrophobic high-efficiency microwave absorbing FeSiCr@Ni according to claim 3 0.5 Zn 0.5 The method for preparing Fe2O4@PUA-PEEK composite material is characterized by, In step 4, the mixture prepared by magnetic separation using ethanol is dried overnight at 45-50°C, and FeSiCr@Ni is collected by washing and magnetic separation. 0.5 Zn 0.5 Fe2O4@PUA.

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