Study On Composition Design And Properties Of Simulant Lunar Mare Basalt Fiber

The construction of a lunar base is a key step in future deep space exploration and a research priority for major spacefaring nations.As a long-term goal for scientific research,many factors need to be considered,starting with how to use lunar soil to prepare structural materials in situ,which will not only reduce transportation costs but also make full use of the unexplored resources on the Moon.Second,a suitable site needs to be selected;some areas of the lunar surface may be more suitable for a base than others,and the variability of soil composition in different areas of the Moon needs to be determined.Finally,it is also necessary to consider whether the properties of these structural materials prepared from lunar soil will be altered by the lunar environment and to analyze the mechanisms by which the altered properties occur.In this paper,we collected lunar soil data and established a genomic sub-library of imitation lunar sea basalt fibers,prepared seven components of imitation lunar sea basalt fibers,and simulated the lunar environment to investigate the change pattern of imitation lunar sea basalt fiber properties in the aging environment.The specific study consists of four parts:Firstly,Access database is used as the database system to provide data support,and four information tables including lunar exploration information table,lunar soil exploration information table,simulated lunar soil sample information table and imitation lunar soil-based fiber parameter information table data table are constructed using Visual Basic macro language,and the links between tables are established to realize the functions of data entry,query,addition and modification,etc.The data sources are related literature,international units and experimental research data of our group members in this field.Then,we prepared seven lunar sea basalt glasses with lunar soil fraction,Apollo 15,Apollo17,Luna 16,Luna 24,Chang’E 3,Chang’E 4 and Chang’E 5.Soil fractions,and the basic properties of these seven lunar-like sea basalt glasses were investigated.The results show that the density,hardness,and modulus of each sample differ,and the main reason for the difference is the content of Si O₂,Al₂O₃,and Fe_xO_y in the silicate glass system,and the density of the samples increases as the proportion of Al₂O₃ and Fe_xO_y increases,and the mechanical properties of the glass are enhanced by the increase of Al₂O₃ content.The thermomechanical properties of the samples were summarized,and the results showed that the thermomechanical parameters of the seven components met the fibrillation conditions and were fibrillable components.Then,the effects of the preparation conditions in the anaerobic environment on the stability of fiber formation and fiber mechanical properties of imitation moon sea basalt as well as the study of chemical stability of the fiber were investigated.The results show that:with the increase of reduction degree,the fiber forming of each component becomes more and more stable;with the increase of iron reduction index,the tensile strength of the samples is significantly increased,and the increase range is 15%-20%,among which the average strength of SL16-Ar samples is the largest,reaching 1.08 GPa;after the fiber is corroded by acid and alkali,the mass retention rate and tensile strength are decreasing,and the alkali corrosion is larger than the acid corrosion.The mass retention rate of SL16-Ar fibers decreased to 81.1%and the average tensile strength decreased to 1.03 GPa when the concentration of HCl solution was 3 mol/L;the mass retention rate of SL16-Ar fibers decreased to 53.2%and the average fiber strength decreased to 0.77 GPa when the concentration of Na OH solution was 2.5 mol/L,with a decrease of 28.4%.Finally,the effects of lunar polar temperature difference cycle and UV radiation on the mechanical properties of the fibers and their mechanisms were investigated.The results showed that the tensile strength of each sample decreased to different degrees after the extreme temperature difference cycle,and the decrease ranged from 7%to 10%,and the measured tensile strength of the fiber tended to a steady-state value as the number of temperature difference cycles increased;with the increase of radiation time,the strength of the fiber showed a decreasing trend,and similarly,the tensile strength of the fiber decreased with the increase of radiation intensity.However,in general,the performance of fibers under the action of UV radiation does not change significantly,and the decline is between 5%and 10%.In conclusion,the genomic sub-library of imitation moon sea basalt fibers was established by Access database with 3000 data items,and the fiber-forming properties of seven components of imitation moon sea basalt and the effects of anaerobic environment,extreme temperature difference cycle and UV radiation on the properties of imitation moon sea basalt fibers were studied.