A sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating

Abstract

This invention discloses a method for manufacturing sintered lunar regolith components based on two-dimensional grid-controlled local heating, belonging to the field of sintered lunar regolith component manufacturing technology. The method includes the following steps: Step 1, mixing and compacting conductive fiber braids with lunar regolith to form a composite intermediate layer; Step 2, placing the composite intermediate layer between sintered lunar regolith blocks to form a sandwich structure, and applying pressure to ensure close contact between the sintered lunar regolith blocks and the composite intermediate layer; Step 3, connecting electrodes to the conductive fiber braids on both sides of the composite intermediate layer, and adjusting the input DC current parameters under low pressure, achieving connection of the sintered lunar regolith blocks after power is cut off. This invention, employing the above-mentioned method for manufacturing sintered lunar regolith components based on two-dimensional grid-controlled local heating, provides a new approach to the manufacturing problem of complex sintered lunar regolith components in in-situ lunar resource utilization, avoiding the shortcomings of existing self-propagating connection technologies such as low repeatability and harmful phase continuity.

Description

Technical Field

[0001] This invention relates to the field of sintered lunar soil component manufacturing technology, and in particular to a method for manufacturing sintered lunar soil components based on two-dimensional grid-controlled local heating. Background Technology

[0002] Research on the in-situ utilization of lunar surface resources has primarily focused on the manufacturing process of sintered lunar regolith blocks needed for the construction of lunar research stations. However, current methods for sintering lunar regolith can only produce simple blocks and cannot manufacture large components with complex shapes. Therefore, joining techniques are necessary to connect the sintered lunar regolith blocks.

[0003] Lunar regolith is primarily composed of oxides of silicon, aluminum, calcium, magnesium, iron, and titanium. The chemical bonds within sintered lunar regolith blocks are mainly covalent, classifying it as an inorganic non-metallic material. Under low pressure, the physicochemical properties of sintered lunar regolith blocks are highly temperature-sensitive. When heated to near its melting point (around 1200℃), due to its complex chemical composition, low-melting-point phases rapidly form and decompose, leaving numerous pores within the lunar regolith, leading to a significant deterioration in its mechanical properties. Currently, the forming technology for complex components from sintered lunar regolith blocks is self-propagating bonding. This method utilizes the exothermic chemical reaction of a Ni-Al mixture within the lunar regolith brick to achieve localized melting at the bonding interface, enabling energy-efficient and rapid bonding. However, as a technology reliant on the chemical reaction of the intermediate layer, its bonding effectiveness is heavily influenced by the intermediate layer's composition, thickness, and the thickness of the base material. The combined effect of these factors results in poor bonding repeatability and a high failure rate. Meanwhile, Ni and Al mixtures are usually applied by filling the gaps. As a result, the self-propagating synthesis product NiAl intermetallic compounds are concentrated and have huge chemical properties that are different from those of sintered lunar soil blocks. They are harmful phases at the joints, resulting in low strength at the joints of sintered lunar soil bricks. Summary of the Invention

[0004] The purpose of this invention is to provide a method for manufacturing sintered lunar regolith components based on two-dimensional grid-controlled local heating, which provides a new approach to the manufacturing problem of complex sintered lunar regolith components in the in-situ utilization of lunar resources, and avoids the shortcomings of existing self-propagating bonding technology, such as low repeatability and harmful phase continuity.

[0005] To achieve the above objectives, the present invention provides a method for manufacturing sintered lunar soil components based on two-dimensional grid-controlled local heating, comprising the following steps:

[0006] Step 1: Mix and compact the conductive fiber braid with lunar soil to form a composite intermediate layer;

[0007] Step 2: Place the composite intermediate layer between the sintered lunar soil blocks to form a sandwich structure, and apply pressure to ensure close contact between the sintered lunar soil blocks and the composite intermediate layer.

[0008] Step 3: Connect the electrodes to the conductive fiber braids on both sides of the composite intermediate layer, and adjust the input DC power parameters under low pressure. After power is cut off, the connection of the sintered lunar soil blocks is achieved.

[0009] Preferably, in step one, the conductive fiber braid is a conductive material that can withstand temperatures above 1200°C, and the conductive fiber braid is one of carbon fiber and high-temperature alloy fiber.

[0010] Preferably, in step one, the chemical composition of the lunar soil is SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3.

[0011] Preferably, in step one, the specific operation steps of mixing and compaction are as follows: (a) cutting the conductive fiber braid to match the size of the joint; (b) spreading the lunar soil evenly in the U-shaped mold; (c) placing the conductive fiber braid into the mold, exposing the conductive fiber braid at both ends, and filling and covering the gaps between the conductive fiber braids in the mold with lunar soil; (d) applying pressure of 1MPa-50MPa through the pressure head, holding the pressure for 10s-1000s, and the finished thickness of the composite intermediate layer is 0.1mm-10mm.

[0012] Preferably, in step one, the conductive fiber braid in the composite intermediate layer has a two-dimensional mesh structure with a filament diameter of 0.15mm-15mm and a pore size of 0.2mm-20mm.

[0013] Preferably, in step two, the sintered lunar soil block is formed by sintering the lunar soil in step one.

[0014] Preferably, in step two, the pressure applied is 0.1MPa-10MPa.

[0015] Preferably, in step three, the vacuum level of the low-pressure environment is 10. -1 Pa-10 -12 Pa.

[0016] Preferably, in step three, the DC parameters are: current rise rate of 0.1A / s-500A / s, current magnitude of 0.1A-500A, and current duration of 1s-1000s.

[0017] Therefore, the present invention employs the above-mentioned method for manufacturing sintered lunar soil components based on two-dimensional grid-controlled local heating, which has the following beneficial effects:

[0018] (1) Using two-dimensional mesh conductive fiber braid as a controllable local Joule heat source and lunar soil as a conductive fiber braid filling material to form a discontinuous mesh structure composite intermediate layer, so that the sintered lunar soil block can achieve local melting connection, avoiding the disadvantages of low repeatability and easy formation of continuous harmful phases in the self-propagating connection process.

[0019] (2) Using two-dimensional mesh conductive fiber braid as a two-dimensional mesh controllable local Joule heat source, the Joule heat converted from electrical energy is quickly conducted to the part to be connected by contact heating. It has high energy utilization and is suitable for situations where energy is limited in space.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preparation process of the composite intermediate layer of the present invention;

[0022] Figure 2 This is a schematic diagram of the assembly and connection of the present invention;

[0023] Figure 3 This is a scanning electron microscope image of the joint of the sintered lunar soil block of Apollo 16 simulated lunar soil prepared in Example 1 of this invention;

[0024] Figure 4 This is a macroscopic morphology photograph of the CE 5 sintered lunar soil block joint prepared in Example 2 of the present invention.

[0025] Figure Labels

[0026] 1. Lunar soil; 2. Conductive fiber braid; 3. U-shaped mold; 4. Press head; 5. Sintered lunar soil block; 6. Composite intermediate layer; 7. DC power supply; 8. Apollo 16 simulated lunar soil sintered block; 9. Apollo 16 simulated lunar soil after melting and cooling; 10. CE5 simulated lunar soil sintered block. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Example 1

[0030] This invention provides a method for manufacturing sintered lunar soil components based on controllable local heating using a two-dimensional grid, comprising the following steps:

[0031] Step 1: A two-dimensional carbon fiber mesh conductive fiber braid 2, with a filament diameter of 0.2 mm and a pore size of 0.5 mm, capable of withstanding temperatures above 1200℃, is prepared by: (a) cutting the conductive fiber braid 2 to match the joint dimensions; (b) evenly spreading lunar soil 1, composed of SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3, inside a U-shaped mold 3; (c) placing the conductive fiber braid 2 into the U-shaped mold 3, exposing both ends of the conductive fiber braid 2, and filling and covering the gaps between the conductive fiber braid 2 inside the U-shaped mold 3 with lunar soil 1; (d) applying pressure of 10 MPa through a pressure head 4 for 300 seconds to form a composite intermediate 6 with a thickness of 1 mm. Figure 1 As shown.

[0032] The lunar soil 1 in step one is the simulated lunar soil from Apollo 16.

[0033] Step 2: Place the composite intermediate layer 6 between the sintered lunar soil blocks 5 to form a sandwich structure, and apply a pressure of 0.5 MPa to the sandwich structure to ensure close contact between the three components. The sintered lunar soil blocks 5 are formed by sintering lunar soil 1 using a conventional sintering process.

[0034] In step two, sintered lunar soil block 5 is Apollo 16 simulated lunar soil sintered block 8.

[0035] Step 3: Connect the electrodes to the conductive fiber braids 2 on both sides of the composite intermediate layer 6, under a vacuum of 10... -2Under a low-pressure environment of Pa, the input DC parameters of DC power supply 7 were adjusted: current rise rate was 100A / s, current magnitude was 50A, and current duration was 20s. After power-off, the connection of Apollo 16 simulated lunar soil sintered block 8 was achieved, as follows: Figure 2 As shown.

[0036] Figure 3 The image shows a scanning electron microscope (SEM) image of the joint of the Apollo 16 simulated lunar soil sintered block 8 prepared in Example 1 of this invention. As can be seen from the image, the interface between the Apollo 16 simulated lunar soil 9 and the Apollo 16 simulated lunar soil sintered block 8 after melting and cooling at the joint is clear, the interface is well bonded, and no additional phase is generated.

[0037] Example 2

[0038] The only difference between this embodiment and Embodiment 1 is that in Step 1, lunar soil 1 is CE 5 simulated lunar soil, and in Step 2, sintered lunar soil block 5 is CE 5 simulated lunar soil sintered block 10. All other conditions are the same.

[0039] Figure 4 This is a macroscopic morphology photograph of the joint of the CE 5 simulated lunar soil sintered block 10 prepared in Example 2 of the present invention. The parent material shows no melting deformation, indicating that an effective connection is achieved between the two CE 5 simulated lunar soil sintered blocks 10.

[0040] Therefore, the present invention adopts the above-mentioned method for manufacturing sintered lunar soil components based on two-dimensional grid controllable local heating, which provides a new approach to the manufacturing problem of complex sintered lunar soil components in the in-situ utilization of lunar resources, and avoids the shortcomings of existing self-propagating connection technology such as low repeatability and harmful phase continuity.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for manufacturing sintered lunar soil components based on controllable local heating using a two-dimensional grid, characterized in that: Includes the following steps: Step 1: Mix and compact the conductive fiber braid with lunar soil to form a composite intermediate layer; In step one, the chemical composition of lunar soil is SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3. In step one, the specific steps for mixing and compacting are as follows: (a) cut the conductive fiber braid to match the size of the joint; (b) spread the lunar soil evenly in the U-shaped mold; (c) put the conductive fiber braid into the mold, exposing the two ends of the conductive fiber braid, and fill and cover the gaps between the conductive fiber braids in the mold with lunar soil; (d) apply pressure of 1MPa-50MPa through the pressure head, hold the pressure for 10s-1000s, and the finished product thickness is 0.1mm-10mm. In step one, the conductive fiber braid in the composite intermediate layer has a two-dimensional mesh structure with a filament diameter of 0.15mm-15mm and a pore size of 0.2mm-20mm. Step 2: Place the composite intermediate layer between the sintered lunar soil blocks to form a sandwich structure, and apply pressure to ensure close contact between the sintered lunar soil blocks and the composite intermediate layer. Step 3: Connect the electrodes to the conductive fiber braids on both sides of the composite intermediate layer, and adjust the input DC power parameters under low pressure. After power is cut off, the connection of the sintered lunar soil blocks is achieved.

2. The method for manufacturing sintered lunar soil components based on controllable local heating of a two-dimensional grid according to claim 1, characterized in that: In step one, the conductive fiber braid is a conductive material that can withstand temperatures above 1200℃, and the conductive fiber braid is one of carbon fiber and high-temperature alloy fiber.

3. The method for manufacturing sintered lunar soil components based on two-dimensional grid-controlled local heating according to claim 1, characterized in that: In step two, the sintered lunar soil blocks are formed by sintering the lunar soil from step one.

4. The method for manufacturing sintered lunar soil components based on two-dimensional grid-controlled local heating according to claim 1, characterized in that: In step two, the pressure is 0.1MPa-10MPa.

5. The method for manufacturing sintered lunar soil components based on controllable local heating of a two-dimensional grid according to claim 1, characterized in that: In step three, the vacuum level of the low-pressure environment is 10. -1 Pa-10 -12 Pa.

6. The method for manufacturing sintered lunar soil components based on controllable local heating of a two-dimensional grid according to claim 1, characterized in that: In step three, the DC parameters are: current rise rate of 0.1A / s-500A / s, current magnitude of 0.1A-500A, and current duration of 1s-1000s.

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