CN114890771B - Iron-rich glass spherical lunar soil simulation and preparation method thereof - Google Patents

Iron-rich glass spherical lunar soil simulation and preparation method thereof Download PDF

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CN114890771B
CN114890771B CN202210298144.4A CN202210298144A CN114890771B CN 114890771 B CN114890771 B CN 114890771B CN 202210298144 A CN202210298144 A CN 202210298144A CN 114890771 B CN114890771 B CN 114890771B
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张辉
董珂琪
刘祎炜
姚伟
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China Academy of Space Technology CAST
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Abstract

The invention relates to iron-rich glass spherical simulated lunar soil which is glass spherical particles for introducing simple substance iron in a laser sintering forming mode and a preparation method thereof. The method has the characteristics of simple process, high efficiency and large-scale production, and can prepare the simulated lunar soil with the morphology and the material composition which are highly similar to those of the real lunar soil.

Description

Iron-rich glass spherical lunar soil simulation and preparation method thereof
Technical Field
The invention relates to iron-rich glass spherical lunar soil simulation and a preparation method thereof, which are mainly used in the fields of lunar in-situ resource utilization, space detection and the like.
Background
Lunar base construction is an important task for human exploration of space, and lunar soil is a preferred object for future lunar in-situ resource utilization because of its rich resources available for human development and utilization. Therefore, fully utilizing lunar resources helps to reduce the consumption of the earth resources in the development process, for example, a base can be built through a 3D printing lunar soil technology, raw materials are provided for manned space tasks through extracting the water ice in the lunar soil, and the like. However, the lunar soil is limited by lunar soil acquisition technology, the true lunar soil on the earth is quite rare, scientific research and engineering application requirements are difficult to meet, and feasibility of in-situ resource utilization of the lunar soil cannot be accurately verified. Meanwhile, lunar soil is used as a lunar substance firstly contacted in the lunar exploration activity process, and a series of problems, such as a safe landing problem of a detector, a patrol detection problem of a lunar rover, a working problem of various loads on the lunar surface and the like, are generated due to unavoidable interaction with a device and a person. In view of the above problems, development of lunar soil simulation and development of related scientific researches have become urgent needs in the industry.
In true lunar soil, vitreous granules are the main material component, with a volume ratio of up to 20% -30%. Also, unlike the earth's soil, lunar loam glass beads have a unique ferromagnetic resonance strength due to the partial reduction of iron in the lunar loam to elemental metallic iron (Fe) accompanied by the implantation of solar wind when micro merle strikes the lunar surface 0 ). The stable existence of the simple substance iron not only can change the physical, chemical and optical properties of lunar soil to a certain extent, but also can cause the lunar soil to form adhesion on spacecrafts and spacesuits, thereby causing shielding and blockingDamage from abrasion, etc. In this regard, some technologies propose to introduce elemental iron on the surface of the cementitious glass phase or the simulated lunar soil by using technologies such as thermal reduction, microwave heating, magnetron sputtering and electron beam irradiation to perform ground simulation of the iron-rich lunar soil, but the technologies are limited by the technology, and the technologies generally have the problems of complex flow, low efficiency, harsh conditions, large potential safety hazards in the preparation process and the like, so that the technology is not beneficial to mass production. In addition, most of the lunar soil simulants prepared by the prior art do not have iron-rich glass spherically simulating lunar soil, so how to prepare Fe-containing materials with the morphology and the properties more similar to those of real lunar soil 0 The micro glass sphere-shaped lunar soil simulation becomes a problem to be solved in the field.
Disclosure of Invention
The invention aims to provide iron-rich glass spherical simulated lunar soil and a preparation method thereof.
In order to achieve the above object, the present invention provides an iron-rich glass sphere-like lunar soil and a method for preparing the same, wherein the iron-rich glass sphere-like lunar soil is obtained by forming elemental iron (Fe) by laser sintering 0 ) The glass spherical particles are introduced.
According to one aspect of the invention, the simulated lunar soil is prepared from source rock/existing simulated lunar soil, iron powder and a reducing carbon material;
the iron powder is one or a mixture of more of iron powder, ferrous oxide powder and ferroferric oxide powder;
the reducing carbon material is one or a mixture of more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano materials.
According to one aspect of the invention, the simulated lunar soil is opaque glass spherical particles with an average particle size of 0.02-50000 mu m, and the atomic percentage of iron element in the simulated lunar soil is 5-95%.
The preparation method of the iron-rich glass spherical simulated lunar soil comprises the following steps:
a. selecting raw materials and screening an initial sample from the raw materials;
b. selecting a part of samples from the initial samples and mixing the selected samples with iron powder;
c. and preparing the simulated lunar soil by using the mixed materials.
According to one aspect of the invention, in said step (a), the physicochemical characteristics of the source rock or of the existing simulated lunar soil are analyzed, and a material having physicochemical properties similar to those of the real lunar soil is selected as a raw material therefrom;
the raw materials are dried and crushed, and initial samples with different particle sizes are obtained through screening.
According to one aspect of the invention, the drying treatment is that the raw materials are placed in a vacuum oven for drying for 1-3 hours at 90-110 ℃;
crushing treatment is cutting, rolling or grinding;
the particle size of the initial sample obtained by screening is 0.001-100000 μm.
According to one aspect of the invention, the initial sample obtained by screening has a particle size of 500-300. Mu.m, 300-150. Mu.m, 150-75. Mu.m, 75-45. Mu.m, 45-32. Mu.m, 32-20. Mu.m, or 0.1-20. Mu.m.
According to one aspect of the present invention, in the step (b), a sample having a specific particle diameter is selected from the initial samples, mixed with the iron powder, and a reducing carbon material is added to the mixture and uniformly mixed;
the mixing mode is ultrasonic, ball milling or grinding.
According to one aspect of the invention, the iron powder is one or a mixture of more than one of iron powder, ferrous oxide powder and ferroferric oxide powder, and the mass ratio of the sample to the iron powder is 99-1:1-99;
the reducing carbon material is one or a mixture of more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano materials.
According to one aspect of the invention, the mass ratio of sample to ferrous powder is 80-50:20-50.
According to one aspect of the invention, in the step (c), the mixed material is tiled on the surface of the substrate, and the mixed material is melted and molded through a laser sintering molding technology and naturally cooled to room temperature, so that the preparation of the iron-rich glass spherical lunar soil simulator is realized.
According to one aspect of the invention, the substrate is a graphite carbon plate, and the layer thickness of the mixture spread on the substrate is 0.001-100000 mu m;
when the laser sintering molding is carried out, the working mode of the laser is continuous or pulse, the laser power is 5-150w, the laser spot size is 0.5-3mm, and the laser scanning speed is 1-10mm/s.
According to the conception of the invention, the iron-rich glass spherical simulated lunar soil and the preparation method thereof are provided, firstly, source rock or the existing simulated lunar soil is selected as a raw material, physical and chemical component analysis is carried out, then, dry raw materials are screened to obtain initial samples with different particle sizes, the initial samples are uniformly mixed with iron powder and/or iron oxide powder according to a certain proportion, and finally, the prepared mixture is sintered into miniature glass spherical particles through a laser sintering forming technology. Meanwhile, a reducing carbon material is added into the mixed material, so that iron oxide can be reduced into elemental iron, the elemental iron can be formed into a protective environment, oxidation of the elemental iron is avoided, the content of the elemental iron in the glass spherical particles is improved, and finally the iron-rich glass spherical simulated lunar soil is obtained. Therefore, the preparation process is simple and efficient, the large-scale production can be realized, the prepared simulated lunar soil has the characteristic of independent and controllable particle size, the morphology and the material composition are similar to those of real lunar soil, and the simulated lunar soil has important application value for various ground tests related to lunar in-situ resource utilization and space detection engineering, so that the simulated lunar soil has great significance for the development of lunar scientific research and space detection fields.
According to one scheme of the invention, the micro iron-rich glass spherical simulated lunar soil is sintered by the laser sintering technology from the mixture of the existing simulated lunar soil and iron and/or iron oxide, so that the multi-component simulated lunar soil can be directly sintered and formed, the method has the characteristics of quick fusion and solidification and good forming effect, and can be used for continuously and efficiently preparing uniform and highly compact simulated lunar soil in various forms, so that the requirements of manufacturing on demand can be better met, the method is simpler, environment-friendly and easy to operate, no impurity is doped, the production efficiency and the process safety are improved, the method is beneficial to large-scale production, and the reliability is improved for lunar exploration engineering experiments.
According to one embodiment of the invention, the method can be used for creatively preparing a Fe-enriched material 0 The method realizes autonomous and controllable components and particle sizes of the micro glass ball-shaped simulated lunar soil by changing technological parameters such as laser power, iron content and the like in the laser sintering process, so that the diversity of the micro glass ball-shaped simulated lunar soil can be flexibly improved to match the particle sizes of different lunar soil glass beads in CE-5 and Apollo samples, the prepared iron-rich glass ball-shaped simulated lunar soil is more similar to the real lunar soil glass beads in the aspects of components, morphology and the like, and the method has important significance for further deeply researching the lunar soil properties, and provides support for various tests related to lunar engineering detection, in-situ resource utilization and lunar base construction.
Drawings
FIG. 1 schematically shows a flow chart of a method for preparing iron-rich glass spherically simulated lunar soil according to one embodiment of the invention;
FIG. 2 is a scanning electron microscope image of the iron-rich glass spherically simulated lunar soil prepared in example 1 of the present invention;
FIG. 3 is a scanning electron microscope image of the iron-rich glass spherically simulated lunar soil prepared in example 2 of the present invention;
FIG. 4 is an X-ray energy spectrum of the iron-rich glass spherically simulated lunar soil prepared in example 2 of the present invention;
FIG. 5 is a scanning electron microscope image of the iron-rich glass spherically simulated lunar soil prepared in example 3 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
The iron-rich glass spherical simulated lunar soil is glass spherical particles which are formed by introducing elemental iron in a laser sintering mode. The simulated lunar soil is prepared from source rock/existing simulated lunar soil, iron powder and a reducing carbon material. Wherein the iron powder is one or a mixture of more of iron powder, ferrous oxide powder and ferroferric oxide powder; the reducing carbon material is one or a mixture of more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano materials. The simulated lunar soil is opaque glass spherical particles with the average particle diameter of 0.02-50000 mu m, and the atomic percentage content of iron element in the simulated lunar soil is 5-95% (namely, the atomic percentage of iron element in all elements is 5-95%).
Referring to fig. 1, the preparation method of the iron-rich glass sphere-shaped lunar soil comprises the steps of firstly selecting raw materials and screening initial samples from the raw materials, wherein the raw materials are source rock or existing lunar soil. Specifically, physical and chemical characteristics of source rock or existing simulated lunar soil are analyzed and represented, and materials similar to physical and chemical properties (such as chemical elements, physical forms, particle sizes and the like, and can be specifically selected according to the type of the real lunar soil, such as Apollo, lunar, CE and the like) of the real lunar soil are selected as raw materials. And drying and crushing the raw materials, and screening by utilizing sieves with different apertures to obtain initial samples with different particle diameters. The drying treatment is that the raw materials are placed in a vacuum oven at 90-110 ℃ for drying for 1-3 hours, and the crushing treatment is cutting, rolling or grinding. The particle size of the initial sample obtained by screening is in the range of 0.001-100000. Mu.m, preferably, the particle size of the initial sample isolated by screening may be 500-300. Mu.m, 300-150. Mu.m, 150-75. Mu.m, 75-45. Mu.m, 45-32. Mu.m, 32-20. Mu.m, or 0.1-20. Mu.m (i.e. < 20. Mu.m).
Then, a part of the (initial) sample in a specific particle size range (for example, 1-2 particle size ranges among 7 particle size ranges separated from the above screening) is selected from the initial sample, and is thoroughly mixed with the iron powder in a certain ratio, and the reducing carbon material is added to the mixture and uniformly mixed by ultrasonic, ball milling or grinding. Wherein the iron powder is one or more of iron powder, ferrous oxide powder and ferroferric oxide powder (such as mixture of iron powder and ferrous oxide). The mass ratio of the (initial) sample to the iron powder was 99-1:1-99, preferably, the mass ratio of sample to iron powder is 80-50:20-50. The reducing carbon material is one or more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano material (such as mixture of graphite carbon powder and carbon black).
Finally, preparing the iron-rich glass spherical simulated lunar soil by using the mixed materials (powder mixture). Specifically, the mixed material is tiled on the surface of a substrate, a laser is adjusted to focus the laser to the mixture, the laser provides a heat source, the prepared mixed material is fused and sintered and molded through a laser sintering and molding technology according to the set technological parameters, and the fused and sintered miniature iron-rich glass spherical simulated lunar soil is naturally cooled to room temperature to avoid the form change caused by external factors at high temperature, so that the preparation of the iron-rich glass spherical simulated lunar soil (namely, glass beads with particle size and form more similar to those of real lunar soil) is realized. Wherein the substrate is a graphite carbon plate, and the layer thickness of the powder mixture spread on the surface of the substrate is 0.001-100000 mu m. The specific technological parameters during laser sintering molding are that the working mode of the laser is continuous or pulse, the laser power is 5-150w, the laser spot size is 0.5-3mm, and the laser scanning speed is 1-10mm/s. The particle size of the final iron-rich glass spherical simulated lunar soil can be controlled according to the composition of the mixture and the technological parameters of laser sintering, and the average particle size range is 0.02-50000 mu m.
The method of the invention is described in detail in the following three examples:
example 1
The preparation method of the iron-rich glass spherical simulated lunar soil comprises the following steps:
the existing simulated lunar soil (CUG-1A) with physical and chemical properties similar to those of the real lunar soil is selected as a raw material. CUG-1A is a simulation sample of low-titanium lunar soil with particle size of 30-770 μm and relative density of 2.88 g-cm 3
The existing simulated lunar soil (CUG-1A) was placed in a vacuum oven at 100deg.C for 3 hours and crushed and ground with a crusher to obtain an initial sample. CUG-1A was then screened using 424 mesh and 625 mesh screens to isolate initial sample-1 having a particle size of 32-20. Mu.m.
Initial sample-1 was mixed with ferrous oxide powder according to 75:25 mass ratio, followed by addition of graphite carbon powder. Wherein, the mass ratio of the ferrous oxide powder to the graphite carbon powder is 6:1. then carrying out ultrasonic treatment for 30min to obtain a uniformly dispersed mixture.
The mixture powder was then tiled onto the surface of a graphitic carbon plate and the mixture layer thickness was controlled to 0.05mm, and the laser was adjusted so that the laser focused on the sample. Subsequently, relevant process parameters were set, i.e. the operation mode of the laser was set to continuous, the laser power was set to 50w and the laser spot size was set to 1.5mm. Starting a laser, controlling the heating temperature of the graphite carbon plate surface mixture according to preset parameters by laser power, and performing laser sintering and fusion forming at a scanning speed of 5mm/s to prepare the miniature iron-rich glass spherical simulated lunar soil-1.
After naturally cooling to room temperature, the micro iron-rich glass ball-shaped simulated lunar soil-1 in the example 1 is obtained by adopting a scanning electron microscope test, and the form and the particle size of the micro iron-rich glass ball-shaped simulated lunar soil-1 are shown in figure 2.
Example 2
The preparation method of the iron-rich glass spherical simulated lunar soil comprises the following steps:
the existing simulated lunar soil (CUG-1A) with physical and chemical properties similar to those of the real lunar soil is selected as a raw material. CUG-1A is a simulation sample of low titanium lunar soil with a particle size ranging from 30 to 770 μm and a relative density of 2.88g/cm3.
The existing simulated lunar soil (CUG-1A) was placed in a vacuum oven at 100deg.C for 3 hours and crushed and ground with a crusher to obtain an initial sample. CUG-1A was then screened using 424 mesh and 625 mesh screens to isolate initial sample-2 having a particle size of 32-20. Mu.m.
Initial sample-2 was mixed with ferrous oxide powder according to 75:25 mass ratio, followed by addition of graphite carbon powder. Wherein, the mass ratio of the ferrous oxide powder to the graphite carbon powder is 6:1. then carrying out ultrasonic treatment for 30min to obtain a uniformly dispersed mixture.
The mixture powder was then tiled onto the surface of a graphitic carbon plate and the mixture layer thickness was controlled to 0.05mm, and the laser was adjusted so that the laser focused on the sample. Subsequently, relevant process parameters were set, i.e. the operation mode of the laser was set to continuous, the laser power was set to 30w and the laser spot size was set to 1.5mm. Starting a laser, controlling the heating temperature of the graphite carbon plate surface mixture according to preset parameters by laser power, and performing laser sintering and fusion forming at a scanning speed of 5mm/s to prepare the miniature iron-rich glass spherical simulated lunar soil-2.
After naturally cooling to room temperature, the form and the particle size of the miniature iron-rich glass spherical lunar soil-2 in the example 2 are shown in figure 3, and the element distribution condition of the miniature iron-rich glass spherical lunar soil-2 in the example 2 is shown in figure 4.
The iron-rich glass prepared in example 2 has a spherically simulated lunar soil element distribution as shown in table 1 below:
Figure BDA0003562454450000091
Figure BDA0003562454450000101
TABLE 1
Example 3
The preparation method of the iron-rich glass spherical simulated lunar soil comprises the following steps:
the existing simulated lunar soil (CUG-1A) with physical and chemical properties similar to those of the real lunar soil is selected as a raw material. CUG-1A is a simulation sample of low titanium lunar soil with a particle size ranging from 30 to 770 μm and a relative density of 2.88g/cm3.
The existing simulated lunar soil (CUG-1A) was placed in a vacuum oven at 100deg.C for 3 hours and crushed and ground with a crusher to obtain an initial sample. Then, CUG-1A was screened using 200 mesh and 325 mesh screens to isolate the initial sample-3 having a particle size of 75-45. Mu.m.
Initial sample-3 was mixed with elemental iron powder according to 80:20, and then carrying out ultrasonic treatment for 30min to obtain a uniformly dispersed mixture.
The mixture powder was then tiled onto the surface of a graphitic carbon plate and the mixture layer thickness was controlled to 0.05mm, and the laser was adjusted so that the laser focused on the sample. Subsequently, relevant process parameters were set, i.e. the operation mode of the laser was set to continuous, the laser power was set to 50w and the laser spot size was set to 1.5mm. Starting a laser, controlling the heating temperature of the graphite carbon plate surface mixture according to preset parameters by laser power, and performing laser sintering and fusion forming at a scanning speed of 5mm/s to prepare the miniature iron-rich glass spherical simulated lunar soil-3.
After naturally cooling to room temperature, the micro iron-rich glass ball-shaped simulated lunar soil-3 in the example 3 is obtained by adopting a scanning electron microscope test, and the form and the particle size of the micro iron-rich glass ball-shaped simulated lunar soil-3 are shown in figure 5.
In conclusion, the preparation method of the iron-rich glass spherical lunar soil simulation has the characteristics of low cost, simplicity, convenience and easiness in large-scale production, and the Fe-rich glass bead with the morphology and the components similar to those of the real lunar soil glass bead is obtained through a high-efficiency preparation process 0 The glass ball-shaped simulated lunar soil can be further mixed with the existing simulated lunar soil to further improve the similarity between the simulated lunar soil and the real lunar soil, so that foundation and support are provided for lunar scientific research, deep space exploration tasks and ground tests of resource utilization.
The above is only one embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection of the present invention.

Claims (7)

1. The iron-rich glass spherical simulated lunar soil is characterized in that the iron-rich glass spherical simulated lunar soil is glass spherical particles which are formed by introducing elemental iron into source rock or the existing simulated lunar soil, iron powder and a reducing carbon material through a laser sintering molding mode;
the iron powder is one or a mixture of more of iron powder, ferrous oxide powder and ferroferric oxide powder;
the reducing carbon material is one or a mixture of more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano materials;
the iron-rich glass spherical simulated lunar soil is opaque glass spherical particles with the average particle diameter of 0.02-50000 mu m, and the atomic percentage of iron element in the iron-rich glass spherical simulated lunar soil is 5-95%.
2. The preparation method of the iron-rich glass spherical simulated lunar soil comprises the following steps:
a. selecting raw materials and screening an initial sample from the raw materials;
b. selecting a sample with specific particle size from the initial sample, mixing the sample with iron powder, adding a reducing carbon material into the mixed material, and uniformly mixing, wherein the reducing carbon material is one or a mixture of more of graphite carbon powder, carbon black, soft carbon, hard carbon and carbon nano materials;
c. preparing simulated lunar soil by using the mixed materials;
in the step a, analyzing physical and chemical characteristics of source rock or existing simulated lunar soil, and selecting materials with physical and chemical properties similar to those of real lunar soil as raw materials; drying and crushing raw materials, and screening to obtain initial samples with different particle diameters; the particle size of the initial sample obtained by screening is 0.001-100000 μm;
in the step c, the mixed material is paved on the surface of a substrate, the mixed material is formed by melting through a laser sintering forming technology, and the mixed material is naturally cooled to room temperature, so that the preparation of the iron-rich glass spherical lunar soil is realized.
3. The method according to claim 2, wherein in the step a, the drying treatment is that the raw material is placed in a vacuum oven to be dried for 1-3 hours at 90-110 ℃;
the crushing treatment is cutting, rolling or grinding.
4. The method according to claim 2, wherein in step b, the mixing is by ultrasonic, ball milling or grinding.
5. The method of claim 4, wherein the mass ratio of sample to ferrous powder is 99 "1: 1-99.
6. The method of claim 4, wherein the mass ratio of sample to ferrous powder is 80-50:20-50.
7. The method according to claim 2, wherein in step c, the substrate is a graphitic carbon plate, and the layer thickness of the mixture spread on the substrate is 0.001-100000 μm;
when the laser sintering molding is carried out, the working mode of the laser is continuous or pulse, the laser power is 5-150w, the laser spot size is 0.5-3mm, and the laser scanning speed is 1-10mm/s.
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