Al/TiO2 bilayer coatings for space applications: Mechanical and thermoradiation properties

Lobanov, L.M.; Ustinov, А.I.; Волков, В. С.; Mokhniuk, A.A.; Telichko, V.A.; Demchenkov, S.А.

doi:10.1016/j.tsf.2018.10.017

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…In this study, the materials in powder form can be classified into 3 types: passive radiative cooling (PRC) powder, modifying powder, and geopolymer powder. PRC powder includes cordierite and BOFs which both have high emissivity in the "sky window" [24,26]; modifying powder includes titanium oxide and calcium carbonate, which both have a great white appearance [18,27]; and geopolymer powder includes metakaolin and calcium silicate. Calcium silicate was used for improving anti-crack characteristics.…”

Section: Materials and Preparationmentioning

confidence: 99%

Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Huang

et al. 2020

Sustainability

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Basic oxygen furnace slag (BOFs) is difficult to reutilize because it contains excessive free lime, and thus causes serious expansion. For this reason, how to reuse BOF slag has turned out to be an imperative issue in order to meet the concept of a circular economy. The key intention of this research work is to develop a new way to reutilize BOF slag, which due to its high emissivity in the 8–13 µm wavelength range, can be used as a sustainable, passive radiative cooling material. Passive radiative cooling, without the consumption of any energy, achieves the cooling of a surface by reflecting the sunlight and radiating the heat throughout the outer space (not absorbed by the atmosphere). BOF slag is used as a radiative cooling material in geopolymeric coating. This coating possesses an emissivity of 0.95 within the range of 8–13 µm and also has high conductivity, but its gray appearance absorbs too much heat. Therefore, by improving the situation through a double-layer structure, a temperature drop of 5.9 °C was reached compared to non-coated concrete under simulated sunlight, simultaneously with a low heating rate and high cooling rate. Besides, the binding strength between the geopolymeric coating and Portland cement concrete is comparable to two commercial organic paints. It is highly probable that the utilization of BOF slag in geopolymeric coating is energy saving and also feasible for passive radiative cooling applications. Hence, it can greatly decrease indoor temperature and improve the comfort of people living in buildings.

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Section: Materials and Preparationmentioning

confidence: 99%

Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Huang

et al. 2020

Sustainability

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“…Fig. 2 shows the change in the position of the beam crossover (3), equivalent surfaces of the accelerating field (4) and electron trajectories (6) in the space between the cathode (1), the focusing electrode (2) and the anode (5) of the emission system at the decrease of beam current from 250 mA (a) to 50 mA (b). During the development of the emission system to obtain a high-quality beam with the highest possible laminarity, a well-proven method of trajectory analysis was used (see Fig.…”

Section: Methodsmentioning

confidence: 99%

“…This method has a high energy saving, it provides the best quality of joints and in the future it can be considered as a necessary method for assembly and repair of space equipment in extraterrestrial conditions [1]. The applicability of EBW is not limited to producing of vacuum-tight joints of a wide range of metals and non-metallic materials [2], [3], [4] and can be expanded to the field of additive technologies [5] and the processes of protective coating for using in space vacuum conditions [6]. In addition, EBW equipment for work in space was successfully tested in real conditions [7], [8], [9] proved its effectiveness and safety [10] and now it is the object of further optimization at the stage of on-land tests [11].…”

Section: Introductionmentioning

confidence: 99%

Some Issues of Repairing Manned Space Vehicles in Outer Space Using Electron Beam Welding

Lobanov¹,

Asnis²,

Ternovy³

et al. 2021

SSP

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A new generation of electron beam tool for welding during assembly and repair-restoration works on board of manned space vehicles in open space was demonstrated. The tool includes a small-sized electron beam gun (EBG) with an electron beam power of up to 2.5 kW and a high-voltage power source with a voltage of 10 kV. The design of the electron-optical system of EBG allows using it in both manual as well as in automatic mode applying robotic devices. Applying the manufactured EBG and manipulator, in vacuum chamber the works on simulating the repair of a spacecraft’s section of aluminum 2219 alloy were carried out. The obtained results of studying the structure and mechanical characteristics and also sealing of welds confirmed the high quality of welded joints and a reliability of the technology for repairing a damaged fragment of a spacecraft's body using electron beam welding.

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“…The higher density of the should provide a greater obstacle to the penetration of ions into the structure than . E-beam evaporated /Al bi-layers for space applications have recently been studied to assess their mechanical and thermal radiation properties 23 . In the present work, a bi-layer /Al coating was irradiated with three different ion energies in order to characterize the effect in the metal itself, in the dielectric protective layer and at the interface between the two.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the damage in optical metal/dielectric coatings on the energy of ions in irradiation experiments for space qualification

Pelizzo

Corso

Santi

et al. 2021

Sci Rep

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Terrestrial accelerator facilities can generate ion beams which enable the testing of the resistance of materials and thin film coatings to be used in the space environment. In this work, a $$\hbox {TiO}_2$$ TiO 2 /Al bi-layer coating has been irradiated with a $$\hbox {He}^+$$ He + beam at three different energies. The same flux and dose have been used in order to investigate the damage dependence on the energy. The energies were selected to be in the range 4–100 keV, in order to consider those associated to the quiet solar wind and to the particles present in the near-Earth space environment. The optical, morphological and structural modifications have been investigated by using various techniques. Surprisingly, the most damaged sample is the one irradiated at the intermediate energy, which, on the other hand, corresponds to the case in which the interface between the two layers is more stressed. Results demonstrate that ion energies for irradiation tests must be carefully selected to properly qualify space components.

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Al/TiO2 bilayer coatings for space applications: Mechanical and thermoradiation properties

Cited by 8 publications

References 16 publications

Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Some Issues of Repairing Manned Space Vehicles in Outer Space Using Electron Beam Welding

Dependence of the damage in optical metal/dielectric coatings on the energy of ions in irradiation experiments for space qualification

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