High-entropy alloy composite wave-absorbing material and preparation method thereof

Abstract

The invention provides a high-entropy alloy composite wave-absorbing material and a preparation method thereof, and relates to the technical field of high-entropy alloys. The high-entropy alloy composite wave-absorbing material is prepared by mixing and grinding an inorganic material nano magnesium oxide and a substrate material, and adding a certain proportion of epoxy resin between the materials to improve the composite effect. And then the epoxy resin is removed through annealing treatment, and the obtained high-entropy alloy composite material has excellent wave absorbing performance. The test method used in the invention is low in cost, simple to operate and easy to control, and can be used for repeated tests. And a good design thought is provided for composite preparation of the high-entropy alloy electromagnetic wave absorbing material. And the prepared high-entropy alloy composite material has excellent wave absorbing performance, plays an important role in coping with various electromagnetic pollution, and has a wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of high entropy alloys, and in particular to a high entropy alloy composite absorbing material and a preparation method thereof. Background Art

[0002] With the continuous development of the information age, electronic information technology has brought us great convenience in life. However, the popularity of various electronic devices has also brought many disadvantages, such as electromagnetic wave pollution, which poses a great threat to human health and national information security. Therefore, the research on electromagnetic wave absorbing materials has become a hot topic.

[0003] Absorbing materials achieve the purpose of absorbing waves by converting electromagnetic wave energy into heat or other energy dissipation through some processes. According to the different conversion mechanisms, absorbing materials can be roughly divided into dielectric loss type and magnetic loss type. In the development of absorbing materials, in addition to designing and preparing the composition of the material itself, other substances can also be added for modification to enhance the absorbing performance, such as ZnO, NiCo, C nanotubes, etc.

[0004] High entropy alloys are composed of five or more main elements. This special composition gives high entropy alloys many special properties. There are many studies on the microwave absorption properties of high entropy alloys. Through these studies, it can be found that high entropy alloys with certain components have better microwave absorption properties than some traditional alloys. However, in addition to the regulation of composition, there are few studies on the preparation of microwave absorbing materials by composite doping of high entropy alloys. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a high entropy alloy composite absorbing material and a preparation method thereof. The prepared high entropy alloy composite material has excellent absorbing performance, plays an important role in dealing with various electromagnetic pollution, and has broad application prospects.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented through the following technical solutions:

[0007] A high entropy alloy composite wave absorbing material is composed of the following raw materials in parts by mass: 10 parts of high entropy alloy powder and 0.025-0.05 parts of nano magnesium oxide.

[0008] Preferably, the high entropy alloy powder is (FeCoNi) 86 Al7Ti7, FeCoNiAlCr, FeCoNiMnCr, Fe 34 Co 34 Cr 20 Any one of Ni6Mn6.

[0009] The preparation method of the high entropy alloy composite absorbing material comprises the following steps:

[0010] S1, mixing high entropy alloy powder with nano magnesium oxide to obtain a mixed powder;

[0011] S2, dissolving the binder with alcohol, and then mixing with the mixed powder and grinding to obtain a mixed material for standby use;

[0012] S3, drying the above mixture and heat-treating it at 400-410°C for 40-80 minutes to remove the binder, and then cooling it to room temperature in the furnace to obtain a high entropy alloy composite absorbing material.

[0013] Preferably, the adhesive is epoxy resin.

[0014] Preferably, the mass ratio of the amount of the binder to the high entropy alloy powder is 10:0.15.

[0015] Preferably, the drying temperature in step S3 is 70-90° C., and the drying time is 40-60 min.

[0016] Preferably, the heat preservation treatment at a temperature of 400-410° C. in step S3 is performed under the protection of a nitrogen atmosphere.

[0017] The present invention provides a method for preparing a high entropy alloy composite absorbing material, which has the following advantages over the prior art:

[0018] The present invention mixes and grinds the inorganic material nano-magnesium oxide and the substrate material high entropy alloy together, adds a certain proportion of epoxy resin in the middle to improve the composite effect, and then removes the epoxy resin through annealing treatment, and the obtained high entropy alloy composite material has excellent wave absorption performance; the test method used in the present invention is low in cost, simple to operate, and easy to control, and the test can be repeated many times. It provides a good design idea for the composite preparation of high entropy alloy electromagnetic wave absorption materials. And the excellent wave absorption performance of the prepared high entropy alloy composite material plays an important role in dealing with various electromagnetic pollution and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a SEM image of the high entropy alloy composite absorbing material obtained in Example 1 of the present invention, and the sample powder is spherical;

[0020] Figure 2 A three-dimensional graph showing the minimum reflection loss of the high entropy alloy composite absorbing material obtained in Example 1 of the present invention at different thicknesses;

[0021] Figure 3This is a SEM image of the high entropy alloy composite absorbing material obtained in Example 2 of the present invention, and the sample powder is spherical;

[0022] Figure 4 A three-dimensional graph of the minimum reflection loss of the high entropy alloy composite absorbing material obtained in Example 2 of the present invention at different thicknesses;

[0023] Figure 5 This is a SEM image of the high entropy alloy composite absorbing material obtained in Example 3 of the present invention, and the sample powder is spherical;

[0024] Figure 6 This is a three-dimensional graph of the minimum reflection loss of the high entropy alloy composite absorbing material obtained in Example 3 of the present invention at different thicknesses. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] Preparation of high entropy alloy composite absorbing materials:

[0028] (1) Weigh 10g (FeCoNi) 86 Al7Ti7 high entropy alloy powder and 0.15g epoxy resin;

[0029] (2) Use alcohol as solvent to dissolve epoxy resin, and then mix with (FeCoNi) 86 The Al7Ti7 high entropy alloy powder is physically ground and mixed evenly;

[0030] (3) The mixed sample was placed in a drying oven and dried at 80°C for 50 minutes. After drying, the sample was annealed in a tubular furnace under nitrogen atmosphere protection at 405°C for 1 hour. Finally, the sample was cooled to room temperature in the furnace to obtain a high entropy alloy composite absorbing material.

[0031] The surface morphology of the entropy alloy powder absorbing material was observed by scanning electron microscopy. Figure 1 Then, the entropy alloy powder absorbing material was made into samples of different thicknesses, and the absorbing properties of the samples were measured using a vector network analyzer. The specific results are as follows: Figure 2 As shown in Table 1 below:

[0032] Table 1

[0033]

[0034] And by Figure 2 It can be seen that the minimum reflection loss is -14.807dB and the effective absorption bandwidth (EAB) is 1.95GHz.

[0035] Embodiment 2:

[0036] Preparation of high entropy alloy composite absorbing materials:

[0037] (1) Weigh 10g (FeCoNi) 86 Al7Ti7 high entropy alloy powder, 0.025 g magnesium oxide and 0.15 g epoxy resin;

[0038] (2) Use alcohol as solvent to dissolve epoxy resin, and then mix with (FeCoNi) 86 Al7Ti7 high entropy alloy powder and magnesium oxide are physically ground and mixed evenly;

[0039] (3) The mixed sample was placed in a drying oven and dried at 80°C for 50 minutes. After drying, the sample was annealed in a tubular furnace under nitrogen atmosphere protection at 405°C for 1 hour. Finally, the sample was cooled to room temperature in the furnace to obtain a high entropy alloy composite absorbing material.

[0040] The surface morphology of the entropy alloy powder absorbing material was observed by scanning electron microscopy. Figure 3 Then, the entropy alloy powder absorbing material was made into samples of different thicknesses, and the absorbing properties of the samples were measured using a vector network analyzer. The specific results are as follows: Figure 4 As shown in Table 2 below:

[0041] Table 2

[0042]

[0043] Depend on Figure 4 It can be seen that the minimum reflection loss is -41.202dB, and the effective absorption bandwidth (EAB) is 3GHz; and by comparison with Example 1, it can be seen that the reflection loss of the high entropy alloy composite material prepared in Example 2 corresponding to different thicknesses is greatly improved compared with Example 1.

[0044] Embodiment 3:

[0045] Preparation of high entropy alloy composite absorbing materials:

[0046] (1) Weigh 10g (FeCoNi) 86 Al7Ti7 high entropy alloy powder, 0.05 g magnesium oxide and 0.15 g epoxy resin;

[0047] (2) Use alcohol as solvent to dissolve epoxy resin, and then mix with (FeCoNi) 86 Al7Ti7 high entropy alloy powder and magnesium oxide are physically ground and mixed evenly;

[0048] (3) The mixed sample was placed in a drying oven and dried at 80°C for 50 minutes. After drying, the sample was annealed in a tubular furnace under nitrogen atmosphere protection at 405°C for 1 hour. Finally, the sample was cooled to room temperature in the furnace to obtain a high entropy alloy composite absorbing material.

[0049] The surface morphology of the entropy alloy powder absorbing material was observed by scanning electron microscopy. Figure 5 Then, the entropy alloy powder absorbing material was made into samples of different thicknesses, and the absorbing properties of the samples were measured using a vector network analyzer. The specific results are as follows: Figure 6 As shown in Table 3 below:

[0050] Table 3

[0051]

[0052] Depend on Figure 6 It can be seen that the minimum reflection loss is -26.075dB, and the effective absorption bandwidth (EAB) is 3.45GHz; and by comparison with Example 1, it can be seen that the reflection loss of the high entropy alloy composite material prepared in Example 3 corresponding to different thicknesses is greatly improved compared with Example 1.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high entropy alloy composite absorbing material, characterized in that: The high entropy alloy composite wave absorbing material is composed of the following raw materials in parts by weight: 10 parts of high entropy alloy powder and 0.025-0.05 parts of nano magnesium oxide.

2. The high entropy alloy composite absorbing material according to claim 1, characterized in that: The high entropy alloy powder is (FeCoNi) 86 Al7Ti7, FeCoNiAlCr, FeCoNiMnCr, Fe 34 Co 34 Cr 20 Any one of Ni6Mn6.

3. A method for preparing a high entropy alloy composite absorbing material as claimed in any one of claims 1 to 2, characterized in that: The preparation method comprises the following steps: S1, mixing high entropy alloy powder with nano magnesium oxide to obtain a mixed powder; S2, dissolving the binder with alcohol, and then mixing with the mixed powder and grinding to obtain a mixed material for standby use; S3, drying the above mixture and heat-treating it at 400-410°C for 40-80 minutes to remove the binder, and then cooling it to room temperature in the furnace to obtain a high entropy alloy composite absorbing material.

4. The preparation method according to claim 3, characterized in that: The adhesive is epoxy resin.

5. The preparation method according to claim 3, characterized in that: The mass ratio of the amount of the binder to the high entropy alloy powder is 10:0.

15.

6. The preparation method according to claim 4, characterized in that: The drying temperature in step S3 is 70-90° C. and the drying time is 40-60 min.

7. The preparation method according to claim 4, characterized in that: The heat preservation treatment at 400-410° C. in step S3 is carried out under the protection of a nitrogen atmosphere.

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