FRCU - GIS: Grupo de Ingeniería de Superficies - Artículos

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/812

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Author: search.filters.author.Brühl, Sonia PatriciaSubject: search.filters.subject.Adhesion

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    Fretting wear resistance of DLC hard coatings deposited on nitrided martensitic stainless steel
    (2019-03) Dalibón Bähler, Eugenia Laura; Pecina, Jorge Nahuel; Cabo, Amado; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia Patricia
    In this work, the fretting wear behavior and adhesion of DLC coatings deposited by PACVD on nitrided and non-nitrided martensitic stainless steels were studied. Fretting wear tests were carried out with different duration and loads and pin-on-disk was also performed. The adhesion was evaluated by Rockwell C indentation and scratch test with constant and variable loads. The coating thickness was 2.5 m and the nitrided layer, 11 m. The coating hardness and Young’s Modulus were about 16 and 110 GPa, respectively. The duplex samples resulted with better adhesion than the only coated samples in all test conditions. In the scratch test, the critical load in the duplex sample was 58 N and in the coated sample, 12 N, showing a brittle failure mode. In the Rockwell C indentation test, the adhesion was better in the duplex sample because the nitriding treatment changed the failure mode of the system. The wear resistance was also related to adhesion, since in the experiments with high loads and long durations adhesive failures could be detected when stresses reached the interfac and the substrate. In the duplex sample, the nitrided case, with higher load bearing capacit than the substrate, resulted in a better wear behavior of the system.
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    Influence of the pre-treatments and process temperature on the adhesion of TiN films deposited by PBII&D over nitrided austenitic stainless steel
    (2019-10-28) Vaca, Laura Silvia; Quintana, Juan Pablo; Guitar, María Agustina; Vega, Daniel; Brühl, Sonia Patricia; Márquez, Adriana Beatriz
    In this work the influence of pre-treatment cleaning processes in the adhesion of TiN films deposited by the plasma based ion implantation and deposition (PBII&D) process over plasma nitrided AISI 316L stainless steel was investigated, varying the gas composition, the duration of the sputtering process and the temperature in the same deposition chamber. The TiN film morphology was scrutinized with scanning electron microscopy on the surface complemented with focus ion beam for the cross section. The film microstructure was characterized with X ray diffraction. The adhesion of the coatings was studied using the Scratch Test with constant load at different values and the Rockwell C indentation method as well. It was found that only with the sputtering carried out in a H - Ar gas mixing at 300 ºC temperature used as pre-treatment was successful to prepare the nitrided surface for the subsequent TiN deposition by the PBII&D process.