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

Abstract

The invention discloses a sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating, and belongs to the technical field of sintered lunar soil component manufacturing, and the sintered lunar soil component manufacturing method comprises the following steps: step 1, mixing and compacting a conductive fiber woven body and lunar soil to form a composite middle layer; 2, placing the composite middle layer between the sintered lunar soil blocks to form a sandwich structure, and applying pressure to enable the sintered lunar soil blocks to be in close contact with the composite middle layer; and 3, connecting an electrode with the conductive fiber woven bodies on the two sides of the composite middle layer, adjusting input direct current parameters in a low-voltage environment, and realizing connection of the sintered lunar soil blocks after power failure. According to the manufacturing method for the sintered lunar soil component based on the two-dimensional grid controllable local heating, a new thought is provided for the manufacturing problem of the complex sintered lunar soil component existing in lunar in-situ resource utilization, and the defects that an existing self-propagating connection technology is low in repeatability and continuous in harmful phase are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sintered lunar soil component manufacturing, in particular to a sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating. BACKGROUND

[0002] For the problem of in-situ utilization of lunar surface resources, research mainly focuses on the process manufacturing of sintered lunar soil blocks for the construction of lunar scientific research stations. However, the sintered lunar soil method can only achieve simple block manufacturing and cannot manufacture large-scale components with complex shapes, so the connection of sintered lunar soil blocks can only be achieved through connection technology.

[0003] The main chemical components of lunar soil are silicon, aluminum, calcium, magnesium, iron and titanium oxides, and the chemical bonds in sintered lunar soil blocks are mainly covalent bonds, which belong to inorganic non-metallic materials. In a low-pressure environment, the physicochemical properties of sintered lunar soil blocks are very sensitive to temperature. When the heating temperature is close to the melting temperature (about 1200℃), due to the complex chemical composition, low-melting-point phases will rapidly form and decompose, leaving a large number of pores in the lunar soil, resulting in a significant deterioration of the mechanical properties of the lunar soil block. At present, the sintered lunar soil block complex component forming technology is self-propagating connection. This method realizes the local melting at the connection interface through the heat release of the chemical reaction of Ni and Al mixture in the lunar soil brick to achieve energy-saving and rapid connection. However, as a technology that relies on the chemical reaction of the intermediate layer, its connection effect is seriously affected by the intermediate layer ratio, thickness, and parent material thickness. The combination of these factors results in poor connection repeatability and high failure rate. At the same time, the Ni and Al mixture is usually applied by filling the gap, so the self-propagating synthesis product NiAl intermetallic compound is concentrated and has a large difference in chemical properties with the sintered lunar soil block, which is a harmful phase at the connection, resulting in low strength at the connection of the sintered lunar soil brick. SUMMARY

[0004] The purpose of the present application is to provide a sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating, which provides a new idea for the manufacturing problem of complex sintered lunar soil components in lunar in-situ resource utilization and avoids the disadvantages of low repeatability and continuous harmful phase of the existing self-propagating connection technology.

[0005] To achieve the above purpose, the present application provides a sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating, comprising the following steps: Step one, mix and compact the conductive fiber braid with lunar soil to form a composite intermediate layer; Step two, place the composite intermediate layer between the sintered lunar soil blocks to form a sandwich structure, and give pressure to make the sintered lunar soil blocks and the composite intermediate layer tightly contact; Step three, connect the electrode with the conductive fiber braid on both sides of the composite intermediate layer, and adjust the input direct current parameters in a low pressure environment, and realize the connection of the sintered lunar soil block after power off.

[0006] Preferably, in step one, the conductive fiber braid is made of a conductive material resistant to temperatures above 1200℃, and the conductive fiber braid is one of carbon fiber and high-temperature alloy fiber.

[0007] Preferably, in step one, the chemical components of the lunar soil are SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3.

[0008] Preferably, in step one, the specific operation steps of mixing and compacting are as follows: (a) cutting the conductive fiber braid to match the size of the joint; (b) evenly laying the lunar soil in the U-shaped mold; (c) placing the conductive fiber braid into the mold, exposing the two ends of the conductive fiber braid, and filling and covering the gap between the conductive fiber braids in the mold with lunar soil; (d) applying a pressure of 1MPa-50MPa through a pressure head, and maintaining the pressure for 10s-1000s, and the thickness of the finished product of the composite intermediate layer is 0.1mm-10mm.

[0009] Preferably, in step one, the conductive fiber braid in the composite intermediate layer is a two-dimensional grid structure, the wire diameter is 0.15mm-15mm, and the pore diameter is 0.2mm-20mm.

[0010] Preferably, in step two, the sintered lunar soil block is sintered from the lunar soil in step one.

[0011] Preferably, in step two, the pressure is 0.1MPa-10MPa.

[0012] Preferably, in step three, the vacuum degree of the low pressure environment is 10 -1 Pa-10 -12 Pa.

[0013] Preferably, in step three, the direct current parameters are as follows: the current rise rate is 0.1A / s-500A / s, the current size is 0.1A-500A, and the current duration is 1s-1000s.

[0014] Therefore, the sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating has the following beneficial effects: (1) The two-dimensional grid conductive fiber braid is used as a controllable local Joule heat source, the lunar soil is used as a conductive fiber braid filling material, a discontinuous mesh structure composite intermediate layer is formed, the sintered lunar soil block is locally fused and connected, and the disadvantages of low repeatability and easy formation of continuous harmful phases in the self-propagating connection process are avoided. (2) The two-dimensional grid conductive fiber woven body is used as a two-dimensional grid controllable local Joule heat source, and Joule heat converted from electric energy is rapidly conducted to the connecting part to be connected through contact heating, so that the energy utilization rate is high, and the method is suitable for the case that the energy is limited in space.

[0015] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a preparation flowchart of the composite interlayer of the present application; Figure 2 is an assembly connection schematic diagram of the present application; Figure 3 is a scanning electron microscope image of the Apollo 16 simulated lunar soil sintered lunar soil block joint prepared in Example 1 of the present application; Figure 4 is a macroscopic appearance photograph of the CE 5 sintered lunar soil block joint prepared in Example 2 of the present application.

[0017] REFERENCE NUMERALS 1, lunar soil; 2, conductive fiber woven body; 3, U-shaped mold; 4, pressure head; 5, sintered lunar soil block; 6, composite interlayer; 7, direct current power supply; 8, Apollo 16 simulated lunar soil sintered block; 9, Apollo 16 simulated lunar soil after melting and cooling; 10, CE 5 simulated lunar soil sintered block. DETAILED DESCRIPTION

[0018] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples.

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present application shall be understood as the usual meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second", and similar words used in the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example One The present application provides a sintered lunar soil component manufacturing method based on two-dimensional grid controllable local heating, comprising the following steps: Step one, the carbon fiber two-dimensional grid conductive fiber braid body 2 with a wire diameter of 0.2 mm and a pore diameter of 0.5 mm and resistant to 1200℃ or above is cut to match the size of the joint by: (a) cutting the conductive fiber braid body 2 to match the size of the joint; (b) uniformly laying the lunar soil 1 with chemical components of SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3 in the U-shaped mold 3; (c) placing the conductive fiber braid body 2 into the U-shaped mold 3, exposing the two ends of the conductive fiber braid body 2, and filling and covering the gap between the conductive fiber braid body 2 in the U-shaped mold 3 with the lunar soil 1; (d) applying a pressure of 10 MPa through the pressure head 4 for a pressure holding time of 300 s to form a composite intermediate layer 6 with a thickness of 1 mm, as shown in Figure 1 .

[0021] The lunar soil 1 in step one is Apollo 16 simulated lunar soil.

[0022] Step two, the composite intermediate layer 6 is placed between the sintered lunar soil blocks 5 to form a sandwich structure, and a pressure of 0.5 MPa is applied to the sandwich structure to make the three in close contact. The sintered lunar soil blocks 5 are sintered from the lunar soil 1 according to the conventional sintering process.

[0023] In step two, the sintered lunar soil blocks 5 are Apollo 16 simulated lunar soil sintered blocks 8.

[0024] Step three, the electrodes are connected to the conductive fiber braid bodies 2 on both sides of the composite intermediate layer 6, and in a low-pressure environment with a vacuum degree of 10 -2 Pa, the input DC current parameter current rise rate of the DC power supply 7 is adjusted to 100 A / s, the current size is 50 A, and the current duration is 20 s, and after power-off, the connection of the Apollo 16 simulated lunar soil sintered blocks 8 is realized, as shown in Figure 2 .

[0025] Figure 3 The joint scanning electron microscope image of the Apollo 16 simulated lunar soil sintered blocks 8 prepared in Example 1 shows that the Apollo 16 simulated lunar soil 9 after melting and cooling at the joint of the Apollo 16 simulated lunar soil sintered blocks 8 has a clear interface with the Apollo 16 simulated lunar soil sintered blocks 8, good interface bonding, and no additional phase is generated.

[0026] Example 2 The only difference between this example and Example 1 is that the lunar soil 1 in step one is CE 5 simulated lunar soil, and the sintered lunar soil blocks 5 in step two are CE 5 simulated lunar soil sintered blocks 10, and the rest of the conditions are the same.

[0027] Figure 4This 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.

[0028] 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.

[0029] 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; 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 one, the chemical composition of lunar soil is SiO2, Al2O3, MgO, CaO, FeO, TiO2, MnO, K2O, Na2O, P2O5, and Cr2O3.

4. 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 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 conductive fiber braid at both ends, 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.

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 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.

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 two, the sintered lunar soil blocks are formed by sintering the lunar soil from step one.

7. 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 two, the pressure is 0.1MPa-10MPa.

8. 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 three, the vacuum level of the low-pressure environment is 10. -1 Pa-10 -12 Pa.

9. 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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