Facultad Regional Concep. del Uruguay

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    Prototipo de ensayo en materiales sometidos al desgaste por el grano de arroz con cáscara
    (2020-06-11) Maskavizan, Ana Justina; Cimetta, Julio César; Puente, Gustavo; De Carli, Anibal Carlos
    Los granos de arroz con cáscara poseen una alta abrasividad, que daña y desgasta la maquinaria empleada para la cosecha y manipulación. Esta propiedad difiere según la variedad de arroz considerada. En la actualidad, no existe un método, protocolo de ensayo o normativa con sensibilidad suficiente para diferenciar el desgaste producto del contacto y fricción con el arroz con cáscara. En este proyecto se construyó y puso en funcionamiento un equipo prototipo diseñado para determinar los niveles de abrasividad de distintas variedades de este cultivo. Se realizaron pruebas empleando diversos materiales, formas geométricas, cantidades de granos, velocidades y tiempos de contacto. En función de los resultados obtenidos, se definieron los parámetros óptimos de ensayo para medir esta característica y se determinó el nivel de desgaste producido por las variedades Memby Porá INTA CL y Don Juan INTA. El desgaste debido al contacto con granos de arroz Memby Porá INTA CL fue mayor que el producido por los granos de arroz Don Juan INTA. Además, se propusieron modificaciones y mejoras en el diseño del equipo considerando las condiciones experimentales definidas y los inconvenientes encontrados durante la puesta en funcionamiento.
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    Wear and adhesion properties of a PVD duplex coated medium alloy steel for plungers in the oil and gas industry
    (2017-07-05) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Cabo, Amado; Crimello, Pablo; Aguirre, Luis Alberto; Carfi, Guillermo Rodolfo
    A duplex coating consisting in plasma nitriding of V820 steel (Boehler®) and a CrAlN coating (Balinit©, Oerlikon Balzers) was designed to enhance wear properties of hydraulic fracture pumps plungers used in the O&G Industry. On subsequent reciprocating motions, pumped slurry (containing solid particles) would eventually penetrate the interstice between the plunger´s operating surface and the seal, thus causing permanent damage. The duplex system was analyzed comparing to a standard treatment for these pistons (thermal sprayed coating over carbon steel): optical and electronic microscope, depth hardness profiles, EDS and DRX. Two groups of coated samples were selected with different surface finishing, and the nitrided sample was used for comparison, so as the untreated steel. Scratch Test at different constant loads and Rockwell C indentation were used to test adhesion. Abrasion wear tests were carried out following ASTM G65. Finally, laboratory results were compared to field tests. The PVD coating were 2500 HV hard, 3-4 microns thick, and the nitrided layer provided a soft hardness depth profile of about 320 microns width. The standard thermal spray coating was 800 microns thick, with an average hardness of 750 HV but with an abrupt change in hardness with the substrate. The adhesion was extremely good, critical load was 125 N. In the abrasive tests, the mass loss in the PVD coated samples was reduced 30 times respect to the standard coated samples. In the field technological test the PVD coated pistons improved the quantity of pumping cycles in almost 300%.
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    Wear and adhesion properties of a PVD duplex coated medium alloy steel for plungers inthe oil and gas industry
    (2017-07-05) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Cabo, Amado; Cirimello, Pablo; Aguirre, Luis Alberto; Carfi, Guillermo Rodolfo
    A duplex coating consisting in plasma nitriding of V820 steel (Boehler®) and a CrAlN coating (Balinit©, Oerlikon Balzers) was designed to enhance wear properties of hydraulic fracture pumps plungers used in the O&G Industry. On subsequent reciprocating motions, pumped slurry (containing solid particles) would eventually penetrate the interstice between the plunger´s operating surface and the seal, thus causing permanent damage. The duplex system was analyzed comparing to a standard treatment for these pistons (thermal sprayed coating over carbon steel): optical and electronic microscope, depth hardness profiles, EDS and DRX. Two groups of coated samples were selected with different surface finishing, and the nitrided sample was used for comparison, so as the untreated steel. Scratch Test at different constant loads and Rockwell C indentation were used to test adhesion. Abrasion wear tests were carried out following ASTM G65. Finally, laboratory results were compared to field tests. The PVD coating were 2500 HV hard, 3-4 microns thick, and the nitrided layer provided a soft hardness depth profile of about 320 microns width. The standard thermal spray coating was 800 microns thick, with an average hardness of 750 HV but with an abrupt change in hardness with the substrate. The adhesion was extremely good, critical load was 125 N. In the abrasive tests, the mass loss in the PVD coated samples was reduced 30 times respect to the standard coated samples. In the field technological test the PVD coated pistons improved the quantity of pumping cycles in almost 300%.