Highlights Sulfur-constituents alter the morphology of PS400 and PCD by the formation of adsorbed layers. The mechanical properties of DLC degrade the most, whereas PCD maintains structural integrity. DLC, PCD, PS400, and TiMoS2 could be candidate coatings for key parts in Venus exploration.

    Abstract The extremely hot and dense environment on Venusian surface will degrade almost any material via atmosphere-surface interactions, therefore the exploitation of its soil and atmosphere is very challenging. Exploring rovers are designed with mostly mechanical parts, and the knowledge of the effect of Venusian exposure on mechanical and tribological systems is very important for the longevity of the missions. Herein, we studied the effect of 3-day Venusian exposure on selected interfaces. It was found that diamond-like carbon (DLC) and Ti-doped molybdenum disulfide (TiMoS2) experienced negligible morphological changes, whereas polycrystalline diamond (PCD) and PS400 (plasma sprayed Ni-alloy) formed few-microns thick sulfur-containing reacted surface layers after exposure. Also, PCD retained its structural integrity, while the mechanical properties of DLC deteriorated the most, manifested as 49% decrease in hardness. The hardness of PS400 and TiMoS2 degraded to a lesser degree, with 8 and 26% decrease, respectively. The above coatings could be candidate materials to coat structural and bearing systems in the rovers, probes, and drills for future missions to Venus.


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    Titel :

    Chemical and mechanical analysis of hard coatings exposed under the supercritical CO2 Venus atmospheric surface conditions


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 73 , 8 ; 4378-4390


    Erscheinungsdatum :

    2024-01-11


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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