An uvioresistant ostrich feather dusting brush and a method for making the same

Abstract

The application provides an anti-ultraviolet radiation ostrich feather moon dust brush and a preparation method thereof. After the ostrich feather is cleaned and dried by using plasma under the action of a protective gas, a target material aluminum is sputtered to the surface of the cleaned ostrich feather by a vacuum magnetron sputtering method to form an aluminum film, so that the service life and the anti-ultraviolet radiation capability of the ostrich feather moon dust brush are improved. The ostrich feather is electrified by an electrostatic generator, dust particles can be more effectively adsorbed, and the cleaning efficiency is improved. The physical contact between the bristles and the dust is reduced, the abrasion speed of the moon dust brush is also reduced, and the service life of the ostrich feather moon dust brush is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, in particular to an ultraviolet radiation resistant lunar dust brush and a preparation method thereof. BACKGROUND

[0002] Lunar dust is a kind of small particles widely distributed on the surface of the moon, with a size of about 30 nanometers to 20 microns, and more than 95% of the particles are smaller than 2 microns. Its morphology is complex and varied, mainly composed of glass beads, bubble structure and angular fragments, containing a large amount of nano-particle metallic iron and glass, and the content of glass is more than 50%. In particular parts, especially particles smaller than 2 microns, the content of glass is as high as 80% to 90%. Due to its small size and complex composition, lunar dust is easy to adhere to the surface of the spacecraft, causing damage and pollution to the surface of the spacecraft, and also causing spacecraft failure, including mechanical structure jamming, sealing mechanism failure, optical system sensitivity decline, component wear and tear, and thermal control system failure, thereby affecting the normal operation of the spacecraft and the accurate collection of data.

[0003] Nylon brushes and metal fiber brushes have many limitations in removing lunar dust. Nylon brushes have poor wear resistance, and the bristles are easy to wear after long-term use, resulting in a decline in cleaning effect. At the same time, the temperature resistance of nylon material is limited, and in the extreme temperature environment of the moon, the bristles may become hard or soft, affecting the performance. Most of the natural fabrics and biological hairs suitable for making dust brushes in nature have static electricity, and ostrich feathers are the only biological feathers without static electricity. They have super strong dust absorption capacity and can adsorb fine charged dust particles, and can be easily shaken off. The feather texture is soft and will not cause damage to the surface of the appliance. Ostrich feathers have been used to make lunar dust brushes to clean lunar dust on spacesuits, precision spacecraft and the like. However, ostrich feathers are worn due to friction during use, and the lunar dust brush cannot maintain its stable dust removal performance when exposed to strong ultraviolet radiation on the surface of the moon for a long time. SUMMARY

[0004] Therefore, the present application provides an ultraviolet radiation resistant ostrich feather lunar dust brush and a preparation method thereof, which solves the technical problem that the lunar dust brush in the prior art cannot guarantee its stable dust removal performance when removing lunar dust on spacesuits and precision spacecraft.

[0005] According to a first aspect of the present application, the present application provides a method for preparing an anti-ultraviolet radiation ostrich feather moon dust brush, comprising: cleaning ostrich feathers under the action of a protective gas, drying, and then using a vacuum magnetron sputtering method to sputter target aluminum onto the surface of the cleaned ostrich feathers to form an aluminum film, wherein the thickness of the aluminum film is 500-800 nm, the transmittance of the aluminum film under ultraviolet radiation is ≤40%, the time for the color of the aluminum film to change under ultraviolet radiation is ≥200 min, and the time for the aluminum film to fall off under ultraviolet radiation is ≥300 min.

[0006] In a possible implementation, the protective gas is argon, the jet flow rate of the argon is 0.7-0.8 m / s, and the gas flow rate of the argon is 40-100 sccm; the cleaning power is 200-500 W, the cleaning time is 2-5 minutes, and the cleaning vacuum degree is <50 mTorr; the drying time is 2-4 min, and the drying temperature is 50-70°C.

[0007] In a possible implementation, the length of the ostrich feather is 20-30 mm, the density of the ostrich feather is 0.8-1.0 g / cm³, the elastic modulus of the ostrich feather is 2.0-4.5 Gpa, the hollow rate of the ostrich feather is 70%-80%, and the central hole diameter of the ostrich feather is 0.1 mm-0.5 mm.

[0008] In a possible implementation, the sputtering gas is argon, the sputtering power of the target aluminum is 2-5 kW, the sputtering pressure of the target aluminum is 4-6 Pa, the sputtering flow rate of the target aluminum is 70-90 CC / min, the sputtering pressure of the target aluminum is 4-6 Pa, and the deposition rate of the target aluminum is 5-20 nm / min.

[0009] According to a second aspect of the present application, the present application provides an anti-ultraviolet radiation ostrich feather moon dust brush, which is prepared by the above-mentioned preparation method.

[0010] In a possible implementation, the moon dust brush comprises: ostrich feathers; a base; a first connecting rod, one end of the first connecting rod being detachably connected to the base; an electrostatic switch, the electrostatic switch being arranged on the first connecting rod; a brush head copper wire, one end of the brush head copper wire penetrating through the base and being connected in the shaft of the ostrich feather; an electrostatic generator, the electrostatic generator being arranged in the first connecting rod, one end of the electrostatic generator being electrically connected to the brush head copper wire, and the other end of the electrostatic generator being electrically connected to the electrostatic switch.

[0011] In a possible implementation manner, the lunar dust brush further includes: a second connecting rod; a vacuum motor, which is installed at one end of the second connecting rod; a coupling, a driven shaft of the coupling being fixedly connected with the first connecting rod, and a driving shaft of the coupling being fixedly connected with the vacuum motor.

[0012] In a possible implementation manner, the lunar dust brush further includes: a power supply; a handle, the power supply being arranged in the handle, the other end of the second connecting rod being connected with the handle; the power supply being electrically connected with the vacuum motor; a charging plate; a wire, one end of the wire being electrically connected with the charging plate; a plug, the other end of the wire being electrically connected with the plug; a switch, the switch being arranged on the handle, and the switch being electrically connected with the power supply.

[0013] In a possible implementation manner, the base is made of copper.

[0014] In a possible implementation manner, the brush head copper wire is arranged in a rice-shaped manner.

[0015] The application provides an anti-ultraviolet radiation lunar dust brush, a preparation method and application thereof. The brush hair of the lunar dust brush is selected from ostrich feather with a length of 20-30 mm, a density of 0.8-1.0 g / cm3 and an elastic modulus of 2.0-4.5 Gpa. The ostrich feather is cleaned and dried by using plasma, and a target material aluminum is sputtered on the surface of the cleaned ostrich feather by using a vacuum magnetron sputtering method to form an aluminum film. The thickness of the aluminum film is 500-800 nm, and the transmittance of the aluminum film under ultraviolet radiation is less than or equal to 40%. The lunar dust brush not only improves the service life and ultraviolet radiation resistance of the ostrich feather lunar dust brush, but also makes the ostrich feather charged by using an electrostatic generator, so that dust particles can be more effectively adsorbed, and the cleaning efficiency is improved. The physical contact between the brush hair and the dust is reduced, and the wear rate of the lunar dust brush is also reduced, thereby prolonging the service life of the ostrich feather lunar dust brush. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 shows a structure schematic diagram of a lunar dust removing device according to an embodiment of the application;

[0017] Figure 2 Fig. 3 shows a structure schematic diagram of a brush head copper wire and an electrostatic switch according to an embodiment of the application;

[0018] Figure 3 Fig. 5 shows a structure schematic diagram of an electrostatic generator according to an embodiment of the application;

[0019] Figure 4 Fig. 7 shows a connection structure schematic diagram of ostrich feather and a brush head copper wire according to an embodiment of the application;

[0020] Figure 5 Fig. 1 shows a schematic diagram of the connection structure between the brush head copper wire and the base according to an embodiment of the present application;

[0021] Figure 6 Fig. 2 shows a schematic diagram of the connection structure between the base and the connecting rod according to an embodiment of the present application.

[0022] Legend of reference signs:

[0023] 1, brush head copper wire; 2, base; 3, electrostatic switch; 4, coupling; 5, vacuum motor; 61, first connecting rod; 62, second connecting rod; 7, power supply; 71, plug; 8, switch; 9, charging plate; 10, handle; 11, wire; 12, ostrich feather; 13, feather shaft; 14, electrostatic generator. DETAILED DESCRIPTION

[0024] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0025] In addition, the reference to "embodiments" in this document means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] Figure 1 Fig. 3 shows a schematic diagram of the structure of the lunar dust removal device according to an embodiment of the present application; Figure 2Fig. 1 is a structural schematic diagram of a brush head copper wire and an electrostatic switch according to an embodiment of the present application; Figure 3 Fig. 2 is a structural schematic diagram of an electrostatic generator according to an embodiment of the present application; Figure 4 Fig. 3 is a structural schematic diagram of a connection between ostrich feather and brush head copper wire according to an embodiment of the present application; Figure 5 Fig. 4 is a structural schematic diagram of a connection between brush head copper wire and base according to an embodiment of the present application; Figure 6 Fig. 5 is a structural schematic diagram of a connection between base and connecting rod according to an embodiment of the present application.

[0028] As shown in Fig. 1, Figures 1-6 The lunar dust brush includes ostrich feather 12, base 2, first connecting rod 61, electrostatic generator 14 and brush head copper wire 1. The base 2 is made of copper. One end of the connecting rod 6 is threadedly connected with the base 2. The electrostatic switch 3 is arranged on the first connecting rod 61. One end of the brush head copper wire 1 penetrates the base and is connected in the feather shaft 13 of the ostrich feather 12. The electrostatic generator 14 is arranged in the first connecting rod 61. One end of the electrostatic generator 14 is electrically connected with the brush head copper wire 1. The other end of the electrostatic generator 14 is electrically connected with the electrostatic switch 3.

[0029] Specifically, the ostrich feather 12 is electrically connected with the brush head copper wire 1, and the brush head copper wire 1 is electrically connected with the electrostatic switch 3. When it is necessary to perform dust removal operation on the spacesuit in space, the electrostatic switch 3 is turned on, so that the ostrich feather 12 has static electricity. The dust removal is performed by using the electrostatic effect, the dust adsorption amount is increased, and the dust removal is more thorough.

[0030] In a possible implementation, the lunar dust brush further includes second connecting rod 62, shaft coupling 4 and vacuum motor 5. The vacuum motor 5 is installed at one end of the second connecting rod 62. The shaft coupling 4 connects the first connecting rod 61 and the second connecting rod 62 and is used to drive the first connecting rod 61 to rotate. The driven shaft of the shaft coupling 4 is fixedly connected with the bottom of the base 2. The driving shaft of the shaft coupling 4 is fixedly connected with the vacuum motor 5.

[0031] In a vacuum environment, the lunar dust brush is driven to rotate by the vacuum motor 5 to remove dust. The astronaut does not need to manually intervene, and the device can efficiently remove the lunar dust. The astronaut can hold the device to conveniently remove dust, or two astronauts can interactively remove dust. The situation that the astronaut cannot conveniently remove dust while wearing gloves is effectively solved.

[0032] It should be understood that in the present application, the coupling 4 can be selected as a rigid GY type flange coupling, the national standard type is GB / T5843-2003, the vacuum motor 5 is a KVM4248D-HT-V5 vacuum high-low temperature stepping system, the vacuum stepping motor meets the AS9100D aerospace certification standard, the vacuum stepping motor can be used in the lunar surface environment, and the vacuum stepping motor is driven through the rigid GY type flange coupling 4, so that the moon dust brush can be driven to rotate at high speed, so as to peel off the moon dust from the surface.

[0033] In a possible implementation, the moon dust brush further comprises a power supply 7, a handle 10, a charging plate 9, a wire 11, a plug 71, a switch 8, the handle 10 is arranged at the other end of the second connecting rod 62, the power supply 7 is arranged in the handle 10, the power supply 7 is electrically connected with the vacuum motor 5, one end of the wire 11 is electrically connected with the charging plate 9, the other end of the wire 11 is electrically connected with the plug 71, the plug 71 is arranged on the power supply 7, and the switch 8 is arranged on the handle 10 and electrically connected with the power supply 7.

[0034] Specifically, the charging plate 9 can be a solar cell panel, the solar cell panel is connected with the power supply 7 at the bottom of the device, and can be hung outside the cabin to be charged by the sun when the astronaut does not carry out the out-of-cabin activity, so that the moon dust brush can be autonomously charged during the lunar day time, the continuous time is prolonged, and the moon dust brush is particularly useful for a long-term lunar mission.

[0035] In a possible implementation, the base is made of copper, copper is a good conductive material, can effectively and uniformly distribute static electricity on the feather, and ensure the use effect of the moon dust brush, the copper material has good ductility and can be processed into various shapes, the corrosion resistance of the copper is good, and the service life of the moon dust brush can be prolonged.

[0036] In a possible implementation, the copper wire 1 of the brush head is arranged in a rice character shape. The rice character-shaped brush head can play a role in multiple directions, whether it is straight brushing or circling, and can maintain good cleaning or smearing effect. Due to the cross arrangement of the bristles, stains and impurities can be more effectively removed during cleaning, and the cleaning efficiency is improved.

[0037] Example 1

[0038] The ostrich feather with a length of 25 mm, a density of 1.01.0 g / cm³, an elastic modulus of 3 Gpa, and a hollow rate of 80% is cleaned by using plasma under the action of a protective gas to remove surface grease, dust and other pollutants, the protective gas is argon, the jet rate of argon is 0.8 m / s, the gas flow of argon is 40 sccm; the cleaning power is 200 W; the cleaning time is 2 minutes; the cleaning vacuum degree is <50 mTorr, the cleaned ostrich feather is placed in an oven at 60°C for 3 minutes, then the dried ostrich feather is fixed on the base and placed in the sputtering cavity of the magnetron sputtering instrument, and the cavity is closed; turn on the vacuum pump to exhaust the air in the cavity to achieve a low vacuum environment (usually between 10^ -5 and 10^ -6 Torr). The aluminum target material with a purity of 99.999% is selected, the sputtering pressure is 5 Pa, argon (Ar) is used as the sputtering gas, the substrate (ostrich feather) temperature is greater than 50°C; the sputtering power is 5 kW, the deposition rate of the aluminum target material is 20 nm / min, and the ostrich feather fixed on the base is sputtered with an aluminum film. The thickness of the aluminum film is 500 nm-800 nm.

[0039] The plated ostrich feather is evaluated for plating success rate, which is recorded by visual inspection whether the plating is uniform and whether there are defects. The plating success rate of Example 1 is 90% after observation.

[0040] The plated ostrich feather is evaluated for plating efficiency, i.e. the time required to achieve the desired plating effect is recorded. The plating efficiency of Example 1 is 3 minutes per sample after evaluation.

[0041] The plated ostrich feather is tested for adhesion, a cross-hatch knife is used to draw a certain number of grid lines (usually 6x6, a total of 36 small squares) on the coating surface, the transparent tape is pressed tightly on the drawn area, then quickly torn off, and the degree of coating peeling is observed and recorded. The evaluation standard is: 5 levels: no coating peeling. 4 levels: coating peeling less than 5%. 3 levels: coating peeling 5%-15%. 2 levels: coating peeling 15%-35%. 1 level: coating peeling 35%-65%. 0 level: coating peeling more than 65%. The coating peeling of Example 1 is 5 levels, i.e. no coating peeling after evaluation.

[0042] The coated ostrich feather is placed under the ultraviolet lamp for ultraviolet radiation resistance test. The coated ostrich feather is irradiated by an ultraviolet lamp with a wavelength of 254 nm. After irradiation for more than 200 minutes, the color of the aluminum film on the surface layer of the ostrich feather changes from silver white or bright gray to dark gray, black or mottled color, and small pores appear on the surface of the aluminum film. After irradiation for more than 300 minutes, the aluminum film on the surface layer of the ostrich feather falls off or deforms. The transmittance before and after ultraviolet irradiation is tested using an ultraviolet intensity detector. The test results show that the transmittance of the coated ostrich feather before ultraviolet irradiation is 60%, and the transmittance of the coated ostrich feather after ultraviolet irradiation is 40%.

[0043] The dust removal efficiency of the coated ostrich feather moon dust brush is evaluated. The dust removal test is performed on the cerium-doped glass using the ostrich feather moon dust brush. Before and after each dust removal test, the mass of the simulated lunar dust is weighed using an electronic balance to calculate the dust removal efficiency. Dust removal efficiency = (dust mass before test - dust mass after test) / dust mass before test x 100%. At least 5 dust removal tests are performed to obtain the average value. The calculation results show that the dust removal efficiency is 99.5%.

[0044] Comparative Example 1

[0045] Ostrich feathers with a length of 25 mm, a density of 1.01.0 g / cm³, an elastic modulus of 3 Gpa, and a hollow rate of 80% are selected. The ostrich feathers are fixed on the base, then placed in the sputtering cavity of the magnetron sputtering instrument, and the cavity is closed. The vacuum pump is turned on to exhaust the air in the cavity to achieve a low vacuum environment (usually between 10^ -5 and 10^ -6 Pa). An aluminum target with a purity of 99.999% is selected. Argon (Ar) is used as the sputtering gas, and the substrate (ostrich feather) temperature is greater than 50°C. The sputtering power is 5 kW, and the deposition rate of the aluminum target is 20 nm / min. A layer of aluminum film with a thickness of 500-800 nm is sputtered on the ostrich feathers fixed on the base.

[0046] The success rate of coating the coated ostrich feather is evaluated by visual inspection to record whether the coating is uniform and whether there are defects. The observation results show that the coating success rate of Comparative Example 1 is 30%.

[0047] The coating efficiency of the coated ostrich feather is evaluated by recording the time required to achieve the desired coating effect. The evaluation results show that the coating efficiency of Comparative Example 1 is 5 minutes per sample.

[0048] The adhesion of the coated ostrich feather was tested by using a crosshatch knife to draw a certain number of grid lines (usually 6x6, a total of 36 small squares) on the surface of the coating, pressing the transparent tape tightly on the drawn area, and then quickly tearing it off. The degree of coating peeling was observed and recorded. The evaluation criteria were as follows: 5 levels: no coating peeling. 4 levels: coating peeling less than 5%. 3 levels: coating peeling 5%-15%. 2 levels: coating peeling 15%-35%. 1 level: coating peeling 35%-65%. 0 level: coating peeling more than 65%. After evaluation, the coating of Comparative Example 1 peeled off at level 2.

[0049] The coated ostrich feather was placed under a UV lamp for UV radiation resistance test. The coated ostrich feather was irradiated by a UV lamp with a wavelength of 254 nm. After 162 minutes of irradiation, the color of the aluminum film on the surface of the ostrich feather changed from silver white or bright gray to dark gray, black or mottled color, and small pores appeared on the surface of the aluminum film. After 258 minutes of irradiation, the aluminum film on the surface of the ostrich feather peeled off or deformed. The transmittance before and after UV irradiation was tested using an ultraviolet intensity detector. The transmittance of the coated ostrich feather before UV irradiation was 65%, and the transmittance of the coated ostrich feather after UV irradiation was 53%.

[0050] The dust removal efficiency of the coated ostrich feather was evaluated after coating. The ostrich feather dust brush was used to test the dust removal on cerium-doped glass. Before and after each dust removal test, the mass of the simulated lunar dust was weighed using an electronic balance to calculate the dust removal efficiency. Dust removal efficiency = (dust mass before test - dust mass after test) / dust mass before test x 100%. At least 5 dust removal tests were conducted to obtain the average value. The calculated dust removal efficiency was 98.6%.

[0051] Comparative Example 2

[0052] Ostrich feathers with a length of 25 mm, a density of 1.01.0 g / cm³, an elastic modulus of 3 Gpa, and a hollow rate of 80% were selected. The surface of the ostrich feather was lightly sanded with 600 grit sandpaper for about 1 minute. Then the sandpaper-sanded ostrich feather was fixed on the base and placed in the sputtering cavity of the magnetron sputtering instrument, and the cavity was closed. The vacuum pump was turned on to extract the air in the cavity to achieve a low vacuum environment (usually between 10^ -5 and 10^ -6 The purity of the aluminum target material was 99.999%, the sputtering pressure was 5 Pa, argon (Ar) was used as the sputtering gas, and the substrate (ostrich feather) temperature was greater than 50°C. The sputtering power was 5 kW, the deposition rate of the aluminum target material was 20 nm / min, and the thickness of the aluminum film was between 500 nm and 800 nm.

[0053] The plating success rate of the plated ostrich feather was evaluated by visual inspection to record whether the plating was uniform and whether there were defects. The plating success rate of the plated ostrich feather of Comparative Example 2 was 50% by observation.

[0054] The plating efficiency of the plated ostrich feather was evaluated by recording the time required to achieve the desired plating effect. The plating efficiency of the plated ostrich feather of Comparative Example 2 was 4.5 minutes per sample by evaluation.

[0055] The adhesion of the plated ostrich feather was tested by drawing a certain number of grid lines (usually 6x6, a total of 36 small squares) on the surface of the coating with a cross-cut knife, pressing the transparent tape tightly against the drawn lines, and then quickly tearing it off. The degree of coating peeling was observed and recorded, and the evaluation criteria were as follows: 5: no coating peeling. 4: coating peeling less than 5%. 3: coating peeling 5%-15%. 2: coating peeling 15%-35%. 1: coating peeling 35%-65%. 0: coating peeling more than 65%. The coating peeling of the plated ostrich feather of Comparative Example 2 was rated as 3 by evaluation.

[0056] The plated ostrich feather was placed under a UV lamp for anti-UV radiation testing. The plated ostrich feather was irradiated with a UV lamp with a wavelength of 254 nm. After 138 minutes of irradiation, the color of the aluminum film on the surface of the ostrich feather changed from silver white or bright gray to dark gray, black, or mottled color, and small pores appeared on the surface of the aluminum film. After 220 minutes of irradiation, the aluminum film on the surface of the ostrich feather peeled off or deformed. The transmittance of the plated ostrich feather before and after UV irradiation was tested using a UV intensity detector. The transmittance of the plated ostrich feather before UV irradiation was 60%, and the transmittance of the plated ostrich feather after UV irradiation was 45%.

[0057] The dust removal efficiency of the plated ostrich feather was evaluated after plating. Dust removal tests were performed on cerium-doped glass using an ostrich feather lunar dust brush. Before and after each dust removal test, the mass of the simulated lunar dust was measured using an electronic balance to calculate the dust removal efficiency. Dust removal efficiency = (dust mass before test - dust mass after test) / dust mass before test x 100%. At least 5 dust removal tests were performed to obtain the average value. The dust removal efficiency was calculated to be 99.1%.

[0058] Comparative Example 3

[0059] Select ostrich feathers with a length of 25 mm, a density of 1.0-1.0 g / cm³, an elastic modulus of 3 GPa, and a hollowness of 80%. Rinse the ostrich feathers with deionized water at a flow rate of 2 liters / minute for 2 minutes. Then, place the rinsed ostrich feathers at 60°C to dry for 3 minutes. Fix the dried ostrich feathers onto the base and place them into the sputtering chamber of the magnetron sputtering instrument, then close the chamber. Turn on the vacuum pump to evacuate the air from the chamber, achieving a low vacuum environment (typically around 10^-10^-10). -5 Up to 10^ -6 (Between the base and the substrate). A 99.999% pure aluminum target was selected, the sputtering pressure was 5 Pa, argon (Ar) was used as the sputtering gas, the substrate (ostrich feather) temperature was greater than 50℃, the sputtering power was 5 kW, the aluminum deposition rate was 20 nm / min, and an aluminum film with a thickness of 500 nm-800 nm was sputtered onto the ostrich feather fixed on the base.

[0060] The success rate of the coating on the ostrich feathers was evaluated by visual inspection to record whether the coating was uniform and whether there were any defects. The success rate of the coating in Comparative Example 3 was 40%.

[0061] The coating efficiency of the ostrich feathers after coating was evaluated, that is, the time required to achieve the ideal coating effect was recorded. The evaluation showed that the coating efficiency of Comparative Example 3 was 5 minutes / sample.

[0062] An adhesion test was conducted on the coated ostrich feathers. A cross-cut adhesion tester was used to draw a certain number of grid lines (usually 6×6, 36 small squares) on the coated surface. Transparent tape was pressed firmly against the marked areas and then quickly peeled off. The degree of coating peeling was observed and recorded. The evaluation criteria were: Level 5: No coating peeling; Level 4: Coating peeling less than 5%; Level 3: Coating peeling 5%-15%; Level 2: Coating peeling 15%-35%; Level 1: Coating peeling 35%-65%; Level 0: Coating peeling greater than 65%. The coating peeling of Comparative Example 3 was assessed as Level 2.

[0063] The coated ostrich feathers were placed under a UV lamp for UV radiation resistance testing. Using a 254nm UV lamp, the aluminum film on the surface of the ostrich feathers changed color from silvery-white or light gray to dark gray, black, or mottled after more than 150 minutes of irradiation, and tiny pores appeared on the surface of the aluminum film. After more than 243 minutes of irradiation, the aluminum film on the surface of the ostrich feathers peeled off or deformed. The transmittance before and after UV irradiation was tested using a UV intensity detector. The test results showed that the transmittance of the coated ostrich feathers before UV irradiation was 60%, and the transmittance of the coated ostrich feathers after UV irradiation was 47%.

[0064] Dust removal efficiency evaluation of the coated ostrich feather lunar dust brush: The coated ostrich feather lunar dust brush was used to conduct dust removal test on cerium-doped glass. Before and after each dust removal test, the mass of simulated lunar dust was weighed using an electronic balance to calculate the dust removal efficiency. Dust removal efficiency = (dust mass before test - dust mass after test) / dust mass before test x 100%. At least 5 dust removal tests were conducted to obtain the average value, and the calculated dust removal efficiency was 98.9%.

[0065] Comparative Example 4

[0066] Ostrich feathers with a length of 25 mm, a density of 1.01.0 g / cm³, an elastic modulus of 3 Gpa, and a hollow rate of 80% were selected, and no coating treatment was performed.

[0067] The ostrich feathers were placed under a UV lamp for UV radiation resistance test. The coated ostrich feathers were irradiated with a UV lamp with a wavelength of 254 nm for more than 108 minutes. The color of the aluminum film on the surface of the ostrich feathers changed from silver white or bright gray to dark gray, black or mottled color, and small pores appeared on the surface of the aluminum film. The aluminum film on the surface of the ostrich feathers was irradiated for more than 201 minutes, and the aluminum film was peeled off or deformed. The transmittance before and after UV irradiation was tested using an ultraviolet intensity detector. The transmittance of the coated ostrich feathers before UV irradiation was 85%, and the transmittance of the coated ostrich feathers after UV irradiation was 75%.

[0068] Dust removal efficiency evaluation of the uncoated ostrich feather lunar dust brush: Before and after each dust removal test, the mass of simulated lunar dust was weighed using an electronic balance to calculate the dust removal efficiency. Dust removal efficiency = (dust mass before test - dust mass after test) / dust mass before test x 100%. At least 5 dust removal tests were conducted to obtain the average value, and the calculated dust removal efficiency was 98.4.

[0069] Table 1 Results of different pretreatments of Example 1 and Comparative Examples 1-3

[0070] Item Treatment method Coating success rate (%) Coating efficiency (min / sample) Adhesion (grade) Example 1 Plasma cleaning 90 3 5 Comparative Example 1 No treatment 30 5 2 Comparative Example 2 Sandpaper polishing 50 4.5 3 Comparative Example 3 Water flow washing 40 4.5 2

[0071] From Table 1, it can be seen that the success rate of plating film is 90%, the plating film efficiency is 3 minutes / sample, and the adhesion is 5 levels when the ostrich feather is pretreated by plasma cleaning and then plated. The success rate, plating film efficiency, and adhesion are all better than those of the untreated ostrich feather. The success rate of plating film is 40%, the plating film efficiency is 4.5 minutes / sample, and the adhesion is 2 levels when the ostrich feather is pretreated by water flow washing. The success rate of plating film is higher than that of the untreated ostrich feather, but the plating film efficiency and adhesion are not obviously different from those of the untreated ostrich feather. The water flow washing mainly relies on the impact force and dissolution of water flow to remove organic pollutants such as dust, grease, and protein on the surface. The loose substances and part of the soluble pollutants on the surface are carried away by the water flow, so that a more uniform and stable substrate surface is exposed, which is beneficial to the deposition of sputtering particles. The success rate of plating film is 50%, the plating film efficiency is 4.5 minutes / sample, and the adhesion is 3 levels when the ostrich feather is pretreated by sandpaper grinding. The success rate, plating film efficiency, and adhesion of the ostrich feather pretreated by sandpaper grinding are all higher than those of the ostrich feather pretreated by water flow washing. This is because the sandpaper grinding can remove the pollutants, oxide layer, old coating, or other surface impurities on the substrate surface, and can remove more stubborn pollutants, including some impurities embedded in the substrate surface. In addition, the sandpaper grinding increases the roughness of the substrate surface, which can provide more anchor points, so that the sputtering particles are more easily deposited and fixed on the substrate.

[0072] Table 2 Ultraviolet irradiation results of Example 1 and Comparative Examples 1-4

[0073] Item Transmittance before UV irradiation (%) Transmittance after UV irradiation (%) Time for color change of aluminum film upon UV irradiation (min) Time for peeling of aluminum film upon UV irradiation (min) Example 1 60 40 200 300 Comparative Example 1 65 53 162 258 Comparative Example 2 60 45 138 220 Comparative Example 3 60 47 150 243 Comparative Example 4 85 75 108 201

[0074] As can be seen from Table 2, the ostrich feather brush subjected to plasma cleaning before coating has a significantly improved ability to resist ultraviolet radiation, with a 20% reduction in ultraviolet transmittance. After 200 minutes of ultraviolet irradiation, the color of the aluminum film changes from silver white or bright gray to dark gray, black or mottled color. After 300 minutes of ultraviolet irradiation, the aluminum film begins to fall off or deform, which is much better than the comparative example 1 (without treatment and direct coating), the comparative example 2 (sanding before coating) and the comparative example 3 (water flow cleaning before coating). The ultraviolet transmittance of the direct coating without any pretreatment is reduced by 12%, the ultraviolet transmittance of the sanding before coating is reduced by 15%, and the ultraviolet transmittance of the water flow cleaning before coating is reduced by 13%. This shows that plasma cleaning as an effective surface treatment technology can effectively remove contaminants and organic matter on the surface of the ostrich feather by high-energy particle impact, achieve surface activation and roughness improvement, and enhance the adhesion between the coating material and the substrate, thereby improving the uniformity and density of the coating layer, reducing the pores in the coating layer, effectively blocking the penetration of ultraviolet light, significantly improving the blocking effect of the aluminum film on ultraviolet light, and enhancing the stability of the ostrich feather brush in a vacuum environment.

[0075] Table 3 Dust removal efficiency and durability of example 1 and comparative examples 1-4

[0076] Item Number of experiments Durable time (min) Dust removal efficiency Example 1 5 117 99.5% Comparative Example 1 5 83 98.6% Comparative Example 2 5 108 99.1% Comparative Example 3 5 91 98.9% Comparative Example 4 5 75 98.4%

[0077] As can be seen from Table 3, the ostrich feather subjected to plasma cleaning before coating has the best dust removal efficiency and the longest durability. The plasma cleaning technology can effectively remove surface contaminants and organic residues by deeply penetrating the microstructure of the ostrich feather, resulting in a high dust removal rate of 99.5% for the coated ostrich feather brush. The ostrich feather subjected to sanding before coating has the second best dust removal efficiency, which is because sanding with 600 mesh sandpaper can remove contaminants, oxide layers, old coatings or other surface impurities on the ostrich feather. Although sanding can significantly improve the surface cleanliness and roughness, thereby enhancing the adhesion of the coating, it is slightly inferior to plasma cleaning in terms of deep cleaning and surface modification. The dust removal rate of the coated ostrich feather brush is 99.1%. Water flow cleaning relies mainly on the impact force and dissolving effect of water flow to clean the surface, which cannot achieve the same level of deep cleaning and surface modification as plasma and sanding, resulting in a dust removal rate of 98.9% for the coated ostrich feather brush. Direct coating without any pretreatment results in a weak adhesion between the coating and the substrate, with a dust removal rate of 98.6%. The uncoated ostrich feather brush has the lowest dust removal rate of 98.4% due to the lack of any surface treatment or coating to enhance the cleaning efficiency. Therefore, the surface pretreatment method has a significant impact on improving the dust removal efficiency of the ostrich feather brush.

[0078] Therefore, in a vacuum environment, the strong ultraviolet radiation can damage the structure of ostrich feathers, making them brittle or losing elasticity, and reducing the dust removal efficiency. By selecting ostrich feathers as the bristles of the lunar dust brush, the ostrich feathers are first subjected to plasma cleaning, and then a layer of aluminum film is uniformly deposited on the surface of the ostrich feathers using magnetron sputtering technology. This layer of aluminum film can effectively reflect ultraviolet light, reducing the damage of radiation to the lunar dust brush; improve wear resistance, the aluminum film can help the ostrich feather lunar dust brush maintain longer structural integrity and functionality during use, reduce replacement frequency, and reduce maintenance costs; it can also enhance the mechanical strength and stiffness of the ostrich feather brush, making it more durable during cleaning. The application of this innovative technology provides a more efficient and reliable solution for lunar dust removal for future manned lunar missions.

[0079] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An ultraviolet radiation resistant ostrich feather lunar dust brush characterized by, The method comprises the following steps: cleaning ostrich feather under the action of protective gas, drying ostrich feather, and forming an aluminum film on the surface of ostrich feather by vacuum magnetron sputtering method; The ostrich feather has a length of 20-30 mm, a density of 0.8-1.0 g / cm 3 , a modulus of elasticity of 2.0-4.5 Gpa, a hollow rate of 70%-80%, and a central hole diameter of 0.1 mm-0.5 mm. The protective gas is argon, the jet velocity of argon is 0.7-0.8 m / s, and the gas flow of argon is 40-100 sccm. The sputtering gas is argon, the temperature of the substrate ostrich feather is greater than 50℃, the sputtering power of the target aluminum is 2-5 kW, the sputtering pressure of the target aluminum is 4-6 Pa, the sputtering flow of the target aluminum is 70-90 CC / min, and the deposition rate of the target aluminum is 5-20 nm / min. The thickness of the aluminum film is 500-800 nm, and the transmittance of the aluminum film under ultraviolet irradiation is less than or equal to 40%. The moon dust brush comprises: ostrich feather, a base, a first connecting rod, one end of the first connecting rod being detachably connected with the base, an electrostatic switch, the electrostatic switch being arranged on the first connecting rod, a brush head copper wire, one end of the brush head copper wire penetrating through the base and being connected in the shaft of the ostrich feather, an electrostatic generator, one end of the electrostatic generator being electrically connected with the brush head copper wire, and the other end of the electrostatic generator being electrically connected with the electrostatic switch. After the aluminum film is irradiated by ultraviolet rays for 200 min, the color of the aluminum film on the surface layer of the ostrich feather changes from silver white or bright gray to dark gray, black or mottled color, and small pores are generated on the surface of the aluminum film; after the aluminum film is irradiated by ultraviolet rays for 300 min, the aluminum film begins to fall off or deform.

2. The anti-UV radiation ostrich feather dusting brush according to claim 1, characterized in that, 3. The anti-ultraviolet radiation ostrich feather moon dust brush according to claim 1, wherein the cleaning power is 200-500 W, the cleaning time is 2-5 min, and the cleaning vacuum degree is less than 50 mTorr. The drying time is 2-4 min, and the drying temperature is 50-70℃. The moon dust brush further comprises: a second connecting rod; 4. The anti-UV radiation ostrich feather dusting brush according to any one of claims 1 to 3, characterized in that, a vacuum motor installed at one end of the second connecting rod; a coupling, a driven shaft of the coupling being fixedly connected with the first connecting rod, and a driving shaft of the coupling being fixedly connected with the vacuum motor. The moon dust brush further comprises: a power supply; 5. The anti-UV radiation ostrich feather dusting brush according to claim 4, characterized in that, a handle, the power supply being arranged in the handle, the other end of the second connecting rod being connected with the handle, and the power supply being electrically connected with the vacuum motor; a charging plate; a wire, one end of the wire being electrically connected with the charging plate; a plug, the other end of the wire being electrically connected with the plug; a switch, the switch being arranged on the handle, and the switch being electrically connected with the power supply. The base is made of copper. The brush head copper wire is arranged in a rice-shaped pattern.

6. The anti-UV radiation ostrich feather dusting brush according to claim 5, characterized in that, ​ 7. The anti-UV radiation ostrich feather dusting brush according to claim 6, characterized in that, ​

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