Lunar soil imitating fiber with electromagnetic shielding function

Abstract

The invention discloses a lunar soil imitating fiber with an electromagnetic shielding function, raw materials for preparing the lunar soil imitating fiber are components in simulated proportion according to lunar soil components, and a preparation method of the lunar soil imitating fiber comprises the following steps: S1, grinding and uniformly mixing the raw materials; s2, the raw materials are subjected to a melting water quenching method, and the lunar soil imitating glass is prepared; s4, carrying out fiber drawing on the lunar soil imitating glass to obtain lunar soil imitating fibers; and S5, the lunar soil imitating fibers are subjected to two-step heat treatment including nucleation and crystallization in a vacuum environment, the nucleation temperature is 660-700 DEG C, and the crystallization temperature is 850-900 DEG C. A magnetite microcrystalline phase is formed in the fiber subjected to heat treatment, and an original amorphous structure is subjected to partial crystalline transformation, so that micro-crystallization transformation is realized. And the material has good electromagnetic wave absorption performance at the frequency of 16.31 GHz.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnetic fibers, in particular to a lunar soil simulation fiber. BACKGROUND

[0002] In human space exploration, the moon becomes an ideal transfer station and supply station for deep space exploration due to its unique spatial location and resource advantages. The construction of a lunar base is a key to promoting the further development of deep space exploration and is of great significance to achieving the goal of interstellar exploration. Chang'e-6 successfully completed the first lunar back sampling, promoting human cognition and utilization of the moon back into a new stage. The moon back has little interference from Earth's electromagnetic signals and low noise, providing a natural advantage in scientific exploration experiments and deployment of detection equipment.

[0003] Based on the lunar back samples obtained by Chang'e-6, Li Chunlei et al. in Nature of the lunar far-side samples returned by the Chang'E-6 mission give the chemical composition of lunar soil at a certain point, which includes SiO2 45.6 wt%, TiO2 2.7 wt%, Al2O3 14.3 wt%, FeO 17.3 wt%, MnO 0.22 wt%, MgO 7.08 wt%, CaO 11.9 wt%, P2O5 0.07 wt%, Na2O 0.25 wt%, and K2O 0.07 wt%. The research on simulated lunar soil and simulated lunar soil fibers and other derivative materials has become an important link between lunar exploration results and subsequent lunar base construction applications. It is crucial for lunar resource development and ensuring the stable operation of base equipment, and it is necessary to optimize the performance and expand the function of such materials.

[0004] Currently, research on Chang'e-6 simulated lunar soil fibers mainly focuses on fiber reinforcement to improve the basic properties of the material, such as mechanical properties. Chang'e-6 simulated lunar soil has similar components to Earth's basalt, and current fiber research focusing on reinforcement modification can draw on basalt fiber technology. Zhang Xinglei's team patent (CN 120025657 A) significantly improves the fatigue resistance of composite materials through double surface modification and segmented curing process of basalt fiber. Liu Yulong's team patent (CN 120271304 A) designs composite basalt fiber and modified curing agent, significantly enhancing the crack resistance, wear resistance, and corrosion resistance of concrete. These technologies can provide a path for constructing a simulated lunar soil fiber reinforcement system suitable for the moon and facilitating in-situ utilization of lunar resources.

[0005] In the scenarios of deep space exploration and lunar base construction, the electromagnetic environment is complex, and the operation of spacecraft equipment, lunar communication and cosmic ray radiation will all produce electromagnetic interference, which has an urgent demand for the electromagnetic shielding performance of materials. The patent (CN 116120741 B) of Wang Xiaodong team builds a composite coating layer on the surface of basalt fiber and adheres carbon material, and blends with thermoplastic plastic resin, so that the material has mechanical enhancement and wide-band electromagnetic shielding function. The patent (CN 120424565A) of Wanwei team focuses on wear-resistant self-lubrication, but its idea of modifying basalt fiber with Fe3O4 nanoparticles can provide a reference for the design of magnetic components in the modification of simulated lunar soil fiber electromagnetic shielding. These technologies provide a path for the development of simulated lunar soil-based electromagnetic shielding materials suitable for this scenario.

[0006] Exploring new processes that can effectively improve the electromagnetic shielding performance of Chang'e-6 simulated lunar soil fiber has become a problem to be solved, filling the technical gap in this field and providing high-quality material support for lunar base construction and deep space exploration equipment.

[0007] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0008] The purpose of the present application is to provide a simulated lunar soil fiber that can improve the electromagnetic shielding performance of simulated lunar soil fiber and provide high-quality material support for lunar base construction and deep space exploration equipment.

[0009] In order to achieve the above purpose, the technical solutions of the present application are as follows: A simulated lunar soil fiber with electromagnetic shielding function, the preparation raw material is a component simulated according to the composition of Chang'e-6 lunar soil, and the preparation method comprises the following steps: S1. Grind and mix the raw materials evenly; S2. The raw materials are prepared into simulated lunar soil glass by the melt quenching method; S4. The simulated lunar soil glass is drawn into fibers to obtain simulated lunar soil fibers; S5. The simulated lunar soil fiber is subjected to two-step heat treatment of nucleation and crystallization in a vacuum environment, the nucleation temperature is 660-700℃, and the crystallization temperature is 850-900℃.

[0010] Preferably, the melting temperature in step S2 is 1500-1550℃.

[0011] Preferably, in step S2, the temperature is raised to 1500℃ at a rate of 10℃ / min, and the temperature is kept for 3h.

[0012] Preferably, in step S4, the lunar soil glass is drawn into fibers using a melt spinning device, and the spinning temperature is controlled to be 1310±10℃, and the winding rate is 400-1000m / min.

[0013] Preferably, in step S5, the vacuum degree is 0.1-10 Pa, the nucleation temperature is 680℃, the holding time is 2h, the crystallization temperature is 880℃, and the holding time is 2h.

[0014] The simulated ratio of components includes: SiO245-48 wt%, TiO22-5 wt%, Al2O312-15 wt%, FeO16-18 wt%, MnO 0.2-0.6 wt%, MgO 6-9 wt%, CaO 10-12 wt%, P2O50.05-0.1 wt%, Na2CO30.2-0.5 wt%, K2CO30.1-0.2 wt%.

[0015] With the above technical solutions, the present application has the following beneficial technical effects: 1. The magnetite microcrystalline phase is formed in the fiber after heat treatment, and the original amorphous structure is partially crystallized, realizing microcrystallization transformation.

[0016] 2. The reflection loss test results show that the modified fiber has a minimum reflection loss of -11.91 dB at a frequency of 16.31 GHz, indicating that it has good electromagnetic wave absorption performance at this frequency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the XRD pattern of the product before and after heat treatment.

[0018] Figure 2 is the SEM pattern of the product before and after heat treatment.

[0019] Figure 3 is the hysteresis loop diagram of the product after heat treatment.

[0020] Figure 4 is the reflection loss diagram of the product after heat treatment. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are merely intended to explain the present application, and are not limiting to the present application.

[0022] Example 1: A lunar soil fiber with electromagnetic shielding function, the preparation method comprising the following steps: S1. Grind and mix the raw materials evenly; Specifically, a planetary ball mill can be used, with a rotation speed of 300r / min, and grinding for 2h.

[0023] S2. The raw materials are prepared into lunar soil glass by a melt water quenching method; The melting temperature is preferably 1500-1550℃; Specifically, the raw materials can be transferred to a corundum crucible and placed in a muffle furnace, and then heated to 1500℃ at a heating rate of 10℃ / min, and kept for 3h to completely melt the raw materials and achieve composition homogenization, forming a homogeneous phase glass melt; then the glass melt is poured into water for water quenching and rapid cooling to obtain lunar soil glass; S4. The lunar soil glass is subjected to fiber drawing to obtain lunar soil fiber; Specifically, the lunar soil glass can be drawn into fibers by using a melt spinning device, and the spinning temperature is controlled to be 1310±10℃, and the winding rate is 400-1000m / min; S5. The lunar soil fiber is subjected to two-step heat treatment of nucleation and crystallization in a vacuum environment; Specifically, the vacuum degree is 0.1-10 Pa, and the vacuum environment provides a reducing atmosphere, which is helpful for the generation of magnetite. The nucleation temperature is 660-700℃, and the holding time is 2-4h; then crystallization is carried out at 850-900℃, and the holding time is 1.5-2.5h. The holding time for nucleation and crystallization is not completely according to the above range, and those skilled in the art can increase or decrease it according to the actual situation, as long as sufficient nucleation and crystallization can be achieved.

[0024] The preparation raw materials can use actual lunar soil, or use components simulated according to the composition of Chang'e-6 lunar soil instead. The components simulated according to the composition used in the present application include: SiO245-48 wt%, TiO22-5 wt%, Al2O312-15 wt%, FeO 16-18 wt%, MnO 0.2-0.6wt%, MgO 6-9 wt%, CaO 10-12 wt%, P2O50.05-0.1 wt%, Na2CO30.2-0.5 wt%, K2CO30.1-0.2wt%.

[0025] The lunar soil fiber with electromagnetic shielding function is prepared.

[0026] The present application also prepared the lunar soil fiber product with electromagnetic shielding function by the following proportion of components, and used for subsequent testing: SiO245.74 wt%, TiO22.71 wt%, Al2O314.34 wt%, FeO 17.35 wt%, MnO 0.22 wt%, MgO 7.10 wt%, CaO 11.94 wt%, P2O50.07 wt%, Na2CO30.43 wt%, K2CO30.10 wt%.

[0027] In the preparation, the spinning temperature is controlled to be 1310±10℃, the winding rate is 400 m / min; the nucleation temperature is 680℃, the holding time is 2h, the crystallization temperature is 880℃, and the holding time is 2h.

[0028] Figure 1 The XRD pattern of the product is shown in the figure. It can be seen from the figure that the original fiber without heat treatment shows a broadened diffuse peak, without obvious sharp diffraction peak. This indicates that the original fiber is mainly amorphous structure. After the nucleation and crystallization two-step heat treatment, the fiber magnetization appears several sharp diffraction peaks. The positions of these diffraction peaks correspond to the standard diffraction peak positions of Fe3O4 (PDF #89-0691). This shows that after the nucleation and crystallization two-step heat treatment, the microcrystalline phase of magnetite is formed in the fiber, and part of the original amorphous structure is converted into crystalline structure, and microcrystallization transformation occurs.

[0029] Figure 2 The SEM picture and particle size distribution diagram of the product are shown in the figure. It can be seen from the figure that the fiber product without heat treatment Figure 2 (a) and Figure 2 (b) has no obvious particles or crystal grains attached. After heat treatment Figure 2 (c) and Figure 2 (d), the fiber surface is smooth under low magnification, and uniform crystal grains are generated on the fiber surface under high magnification. Further analysis of Figure 2 (d) shows that the size of the generated crystal grains is mainly distributed in the range of 50-80 nm, and the average particle size is about 61 nm. This result shows that heat treatment can effectively promote the formation of uniform crystal grains with a certain size range on the fiber surface, which provides an important microstructure basis for the subsequent magnetization magnetic properties.

[0030] Figure 3 The M-H hysteresis loop diagram of the magnetization with the magnetic field strength is shown in the figure. It can be seen from the figure that the sample shows an S-shaped M-H curve, indicating that the sample has ferromagnetic properties. This magnetic property mainly comes from the ferromagnetic property of Fe3O4 microcrystals.

[0031] Figure 4For the curve of the reflection loss varying with the frequency, the greater the reflection loss value (absolute value) is, the stronger the absorption ability of the material to the electromagnetic wave is, and the less the reflected electromagnetic wave is. In the low frequency band (5-14 GHz range), the absolute value of the reflection loss is small and changes relatively gently, indicating that the absorption ability of the material to the electromagnetic wave in this frequency band is weak, and most of the electromagnetic wave is reflected. With the increase of the frequency, into the high frequency band (after about 14 GHz), the reflection loss rapidly decreases, and reaches the minimum value of-11.91 dB at 16.31 GHz, indicating that at this frequency, the material has good absorption effect on the electromagnetic wave, and can effectively absorb most of the incident electromagnetic wave. After that, the reflection loss rises again, but still maintains a certain absorption ability.

[0032] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification, or direct or indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A lunar soil simulating fiber having an electromagnetic shielding function, characterized by, The raw material is a component prepared according to a simulated lunar soil composition, and the preparation method comprises the following steps: S1. Grinding and mixing the raw material; S2. Preparing lunar soil glass by the melt water quenching method; S4. Fiber drawing of the lunar soil glass to obtain lunar soil fiber; S5. Nuclearization and crystallization of the lunar soil fiber in a vacuum environment, the nuclearization temperature being 660-700 DEG C, and the crystallization temperature being 850-900 DEG C.

2. The lunar soil simulant fiber having an electromagnetic shielding function according to claim 1, wherein, The melting temperature in step S2 is 1500-1550 DEG C.

3. The lunar soil simulant fiber having an electromagnetic shielding function according to claim 1 or 2, wherein the lunar soil simulant fiber having an electromagnetic shielding function is a fiber having a diameter of 0.1 to 10 μm. In step S2, the temperature is raised to 1500 DEG C at a rate of 10 DEG C / min, and maintained for 3h.

4. The lunar soil-like fiber with electromagnetic shielding function as described in claim 1, characterized in that, In step S4, the lunar soil glass is drawn into fiber by using a melt spinning device, and the spinning temperature is controlled to be 1310±10 DEG C, and the winding rate is 400-1000 m / min.

5. The lunar soil simulant fiber having an electromagnetic shielding function according to claim 1, wherein the lunar soil simulant fiber having an electromagnetic shielding function is a fiber having a diameter of 0.1 to 10 μm. In step S5, the vacuum degree is 0.1-10 Pa, the nuclearization temperature is 680 DEG C, the holding time is 2h, the crystallization temperature is 880 DEG C, and the holding time is 2h.

6. The lunar soil simulant fiber having an electromagnetic shielding function according to claim 1, wherein the lunar soil simulant fiber having an electromagnetic shielding function is a fiber having a diameter of 0.1 to 10 μm. The simulated component comprises: SiO2 45-48 wt%, TiO2 2-5 wt%, Al2O3 12-15 wt%, FeO 16-18 wt%, MnO 0.2-0.6 wt%, MgO 6-9 wt%, CaO 10-12 wt%, P2O5 0.05-0.1 wt%, Na2CO3 0.2-0.5 wt%, and K2CO3 0.1-0.2 wt%.

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