CN112010307B - Cr (chromium) 2 Application method of AlC material - Google Patents

Cr (chromium) 2 Application method of AlC material Download PDF

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CN112010307B
CN112010307B CN202010844732.4A CN202010844732A CN112010307B CN 112010307 B CN112010307 B CN 112010307B CN 202010844732 A CN202010844732 A CN 202010844732A CN 112010307 B CN112010307 B CN 112010307B
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张丽
文静
郭阳
张敏
马晓东
殷举航
代灵鹭
张胤
邓龙江
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University of Electronic Science and Technology of China
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Abstract

The invention belongs to the technical field of radar stealth, and particularly relates to Cr 2 A method for using the AlC material. The invention relates to Cr in surface protection systems such as aerospace structures, high-temperature protection, oxidation-resistant coatings and the like 2 The AlC material is used as a high-temperature-resistant radar wave-absorbing material and is applied to high-temperature-resistant wave-absorbing parts such as weaponry, aircraft tail nozzles and the like. The high-temperature radar wave-absorbing material solves the problems of narrow effective bandwidth, poor oxidation resistance, poor wave-absorbing performance and the like of the existing high-temperature radar wave-absorbing material at high temperature. The invention has low cost, excellent wave-absorbing performance and Cr 2 The AlC has high oxidation temperature of 800 ℃, the effective bandwidth (lower than-10 dB) of an X wave band (8-12.4GHz) reaches 2.2GHz, the minimum reflection loss energy at 11.08GHz under the thickness of 2mm reaches-25.09 dB, and the AlC has good oxidation resistance and wave-absorbing performance and meets the requirements of high-temperature radar stealth materials.

Description

Cr (chromium) 2 Application method of AlC material
Technical Field
The invention belongs to the technical field of radar stealth, relates to a high-temperature-resistant radar wave-absorbing material, and particularly relates to a Cr (chromium) material 2 An application method of the AlC material.
Background
Microwave absorbing materials are an important solution to the problem of electromagnetic shielding. The microwave absorbing material suitable for high temperature environment (over 300 ℃) has large demand gap, and can replace civil, commercial and military space shuttles in extreme environment. Therefore, high-temperature microwave absorbing materials with wide absorption bandwidth and strong absorption capacity have attracted extensive attention of researchers. Most magnetic metals, such as Fe, Co, Ni and their alloys or microwave absorbing materials based thereon, are active and oxidizable even at normal temperatures. In addition, due to the curie temperature limitation, they lose magnetism at high temperature, thereby losing wave-absorbing properties. Therefore, dielectric loss absorbers are often used in the high temperature field.
Currently, materials having good wave absorbing properties, such as carbon-based materials (e.g., Carbon Black (CB), Carbon Nanotubes (CNT), etc.), dielectric materials of SiC and MAX compounds, etc., have been widely used. Carbon-based materials are excellent microwave absorbing materials, but they can be oxidized above 300 ℃ and do not have high temperature resistance.
Furthermore, MAX compounds are a unique combination of metals and ceramics, with good electrical and thermal conductivity of metals and high heat resistance of ceramics. Ti (titanium) 3 SiC 2 Are typical representatives of the MAX compounds. Northwest university of industry vs. Ti 3 SiC 2 Has been subjected to a series of studies to find Ti 3 SiC 2 Has excellent absorption performance at room temperature, and the effective bandwidth (less than-10 dB) of the material almost covers the whole X wave band. However, when the temperature is raised to 500 ℃, the absorption performance is remarkably reduced, and when the temperature is higher than 600 ℃, the effective bandwidth is 0. The research result shows that: ti 3 SiC 2 Slowly oxidized from 400 ℃, and the absorption performance of the catalyst is obviously reduced along with the increase of the temperature. Therefore, when the high temperature resistant requirement of the target organism is higher, the existing high temperature resistant microwave absorbing material can not meet the requirement, and the better high temperature resistant microwave absorbing material is urgently needed in the industryExcellent high temperature oxidation resistance and good wave absorption performance.
Disclosure of Invention
Aiming at the problems or the defects, the invention provides a Cr stealth material for solving the problems of oxidation resistance, narrow wave-absorbing effective bandwidth and unstable work of the existing high-temperature radar stealth material 2 The application method of AlC material is characterized by using Cr of MAX phase in three-dimensional layered structure 2 AlC is applied to the field of high-temperature wave absorption. The preparation method of the material is simple and convenient, complex equipment is not needed, and the prepared powder has few impurities and high crystallinity.
Cr (chromium) 2 The application method of the AlC material comprises the following steps: mixing Cr 2 The AlC material is used as a high-temperature-resistant radar wave-absorbing material and applied to high-temperature-resistant wave-absorbing parts of weaponry and aircraft tail nozzles.
Further, the Cr 2 The AlC material is prepared by a salt bath method or a hot pressing method.
Further, the Cr is 2 The AlC material is prepared and applied by adopting a salt bath method, and specifically comprises the following steps:
step 1, Cr powder, Al powder and Cr which are required raw materials 3 C 2 Mixing the powders at a ratio of 0.5:1.2: 0.5;
step 2, adding BaCl 2 Mixing KCl and NaCl in a ratio of 5:3:2, adding 1 wt% of reductive C powder, and heating to a molten state;
step 3, adding the mixed raw materials obtained in the step 1 into the molten salt bath prepared in the step 2, and keeping the temperature for at least 2 hours;
step 4, cleaning, filtering and drying the powder obtained by heat preservation and firing in the step 3 to obtain the required Cr 2 An AlC material;
step 5, Cr prepared in the step 4 2 The AlC material is coated on the corresponding part of the target object in a plasma spraying mode.
Currently with respect to Cr 2 The research on AlC focuses on material processing, mechanical properties and oxidation kinetics, and the preparation method is mainly a hot pressing method. However, Cr 2 The absorption properties of AlC, a well-known candidate for high temperature applications, are less well known. The inventionCr in surface protection systems of aerospace structures, high-temperature protection, oxidation-resistant coatings and the like 2 The AlC material is used as a high-temperature-resistant radar wave-absorbing material and is applied to high-temperature-resistant wave-absorbing parts such as weaponry, aircraft tail nozzles and the like. The problems of narrow effective bandwidth, poor oxidation resistance, poor wave-absorbing performance and the like of the existing high-temperature radar wave-absorbing material at high temperature are solved. The invention has the advantages of low cost, excellent wave-absorbing performance and Cr 2 The oxidation temperature of AlC is higher than Ti at 800 DEG C 3 SiC 2 The oxidation temperature of 400 ℃ is higher, the effective bandwidth (lower than-10 dB) of an X wave band (8-12.4GHz) reaches 2.2GHz, and the minimum reflection loss energy reaches-25.09 dB at 11.08GHz under the thickness of 2 mm.
In conclusion, the invention has the advantages of simple implementation, low cost and Cr 2 The AlC is applied to the high-temperature radar stealth material, has good oxidation resistance and wave-absorbing performance, and meets the requirements of the high-temperature radar stealth material.
Drawings
FIG. 1 is a scanning electron microscope image of the example material;
FIG. 2 is an XRD diffraction pattern of the example material;
FIG. 3 is a Raman spectrum of the example material;
FIG. 4 TG measurement curves of the materials of the examples at a temperature rise rate of 10 ℃/min;
FIG. 5 shows the example material in Cr 2 Cr when AlC content is 70% 2 Reflection loss of AlC/paraffin mixture.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example (b): high-temperature-resistant three-dimensional layered structure Cr 2 And preparing an AlC material.
Step 1, 0.1mol Cr powder, 0.24mol Al powder and 0.1mol Cr powder 3 C 2 Mixing the powder for later use;
step 2, mixing 500g BaCl 2 300g of KCl and 200g of NaCl were ground and mixed uniformly, and 10g of reducing C powder was added thereto. Pouring the mixed powder into a graphite crucible, paving, putting into a well type furnace, heating to 970 ℃, and keeping the molten state;
step 3, adding the mixed raw material powder into a salt bath which is sintered to be molten, and keeping for 2 hours;
step 4, the sintered powder is in a layered block shape, the upper layer is C, the middle layer is mixed salt, and the lower layer is required Cr 2 AlC powder. Taking out the required powder, placing in a beaker, sequentially performing ultrasonic cleaning for 20min, rinsing with deionized water for 5 times, performing suction filtration for 5 times, and centrifuging for 5 times until the upper-layer liquid becomes clear;
step 5, drying the cleaned powder at 120 ℃ for 12h to obtain the required Cr 2 AlC powder;
the phase and morphology analysis of the material of the embodiment is shown in figures 1-3, and the material has high purity and crystallinity, simple preparation process, simple operation and low cost.
TG testing of the example material as shown in fig. 4, the material has a higher oxidation resistance temperature and remains stable below 800 ℃.
To verify Cr 2 Attenuation of AlC on electromagnetic wave, Cr to be prepared 2 AlC is uniformly dispersed in paraffin wax, and has excellent transmittance.
Cr 2 The preparation and test of the AlC/paraffin coaxial ring are as follows:
step 1, weighing 1.8g, 2.1g and 2.4gCr 2 AlC and 1.2g, 0.9g, 0.6g paraffin;
step 2, heating 1.2g, 0.9g and 0.6g of paraffin to be molten, and respectively adding 1.8g, 2.1g and 2.4g of Cr 2 Mixing AlC powder with spoon to fine granule, and making into Cr powder 2 Cr with AlC content of 60%, 70% and 80% 2 AlC/paraffin mixtures;
step 3, the prepared Cr 2 Pressing the AlC/paraffin mixture into a coaxial ring for 30s under the pressure of 10 MPa;
step 4, determining electromagnetic parameters of coaxial rings with different proportions in the frequency range of 8-12.4GHz by using a vector network analyzer (Agilent N5230A);
by using
Figure BDA0002642652360000031
The reflection loss is calculated by the formula, wherein
Figure BDA0002642652360000032
Evaluation of microwave absorption characteristics in the frequency range of 8-12.4GHz (X-band), the material prepared was Cr 2 Cr at an AlC content of 70% 2 The reflection loss of the AlC/paraffin mixture is shown in fig. 5, with an effective bandwidth of up to 2.2GHz at a thickness of 2.0mm and a minimum reflection loss of-25.09 dB at 11.08 GHz.
In conclusion, the material provided by the invention has good oxidation resistance and excellent wave-absorbing performance, can be better applied to the field of high-temperature radar wave-absorbing, is practical and effective, and has good application prospect in the field of high-temperature wave-absorbing.

Claims (3)

1. Cr (chromium) 2 The application method of the AlC material is characterized in that: mixing Cr 2 The AlC material is used as a high-temperature-resistant radar wave-absorbing material and is applied to high-temperature-resistant wave-absorbing parts of weaponry and aircraft tail nozzles.
2. The Cr of claim 1 2 The application method of the AlC material is characterized in that: the Cr is 2 The AlC material is prepared by a salt bath method or a hot pressing method.
3. The Cr of claim 2 2 The application method of the AlC material is characterized in that the Cr material 2 The AlC material is prepared by a salt bath method, and specifically comprises the following steps:
step 1, Cr powder, Al powder and Cr which are required raw materials 3 C 2 Mixing the powders at a ratio of 0.5:1.2: 0.5;
step 2, adding BaCl 2 Mixing KCl and NaCl in a ratio of 5:3:2, adding 1 wt% of reductive C powder, and heating to a molten state;
step 3, adding the mixed raw materials obtained in the step 1 into the molten salt bath prepared in the step 2, and keeping the temperature for at least 2 hours;
step 4, cleaning, filtering and drying the powder obtained by heat preservation and firing in the step 3 to obtain the required Cr 2 An AlC material;
step 5, Cr prepared in the step 4 2 And the AlC material is coated on the corresponding part of the target object in a plasma spraying mode.
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