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      Manufacturing Dense Thick Films of Lunar Regolith Simulant EAC-1 at Room Temperature

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          Abstract

          The Aerosol Deposition (AD, also known as gas kinetic spraying or vacuum deposition) method is a rather novel coating process to produce dense thick films directly from dry ceramic (or metal) powders on a variety of substrates without any heat treatment. Because of the similarity of the up to now used powders and lunar regolith, it is imaginable to use AD systems for future in situ resource utilization missions on the Moon planned by several space agencies. To test the feasibility of such an endeavor, the processability of lunar mare simulant EAC-1 by the AD method has been examined in this study. Three regolith films with an area of 25 × 10 mm 2, and thicknesses between 2.50 µm and 5.36 µm have been deposited on steel substrates using a standard AD setup. Deposited films have been investigated by Laser Scanning Microscopy (LSM) and Scanning Electron Microscopy (SEM). Moreover, the roughness and Vickers hardness of the deposited films and the underlying substrates have been measured. It has been shown that dense consolidated films of regolith simulant can be produced within minutes by AD. The deposited films show a higher roughness and, on average, a higher hardness than the steel substrates. Since on the Moon, naturally available regolith powders are abundant and very dry, and since the required process vacuum is available, AD appears to be a very promising method for producing dense coatings in future Moon exploration and utilization missions.

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          Most cited references34

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          Roughness parameters

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            Room Temperature Impact Consolidation (RTIC) of Fine Ceramic Powder by Aerosol Deposition Method and Applications to Microdevices

            Jun Akedo (2008)
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              Lunar resources: A review

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                05 February 2019
                February 2019
                : 12
                : 3
                : 487
                Affiliations
                [1 ]Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany; functional.materials@ 123456uni-bayreuth.de
                [2 ]Airbus Defence and Space, Microgravity Payloads, 88090 Immenstaad, Germany; marc.haeming@ 123456airbus.com
                Author notes
                [* ]Correspondence: functional.materials@ 123456uni-bayreuth.de ; Tel.: +49-921-557-401
                Author information
                https://orcid.org/0000-0001-7622-0120
                Article
                materials-12-00487
                10.3390/ma12030487
                6384728
                30764479
                60f6474e-4d07-4c46-b0d6-3d3aca3a67b3
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 22 December 2018
                : 01 February 2019
                Categories
                Communication

                moon,in situ resource utilization (isru),regolith simulant,dense thick films,room temperature impact consolidation (rtic),aerosol deposition method (adm),gas kinetic spraying,vacuum deposition

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