ESTUDIO DE LAS PROPIEDADES MECÁNICAS, TRIBOLOGÍCAS Y SUPERFICIALES DE RECUBRIMIENTOS DUROS BASADOS EN TITANIO ( STUDY OF MECHANICAL, TRIBOLOGICAL AND SUPERFICIAL PROPERTIES OF HARD COATINGS BASED ON TITANIUM )

Se depositaron peliculas a base de titanio (Ti/S, TiN/S, Ti/TiN/S, S: sustrato) por DC Magnetron Sputtering, sobre acero 316L, evaluando las propiedades superficiales, mecanicas, adhesion interfacial y el comportamiento tribologico de los recubrimientos. La estructura cristalina del material fue analizada por medio de XRD, determinando estructura cristalina FCC. La dureza se incrementa con la aplicacion de la capa de TiN ( ~17 GPa), pero altos esfuerzos intrinsecos y mayor fragilidad, hacen que posea menor adhesion (~12 N). Las capas metalicas, poseen comportamiento predominantemente plastico, con menores durezas (~7 GPa), pero mayor adhesion (~19N). Las pruebas de desgaste se realizaron por medio de Bola en Disco (BOD), usando como contrapartes bolas de Acero inoxidable 440 (SS440) y Alumina (Al 2 O 3 ) (6mm de diametro), a condiciones de 1N de carga y 10cm/s velocidad. Se realizaron analisis morfologicos y quimicos sobre la pista de desgaste y superficie de las contrapartes utilizando perfilometria y SEM/EDS. Mayores coeficientes de desgaste fueron observados en las capas de Ti, debido a baja resistencia a la deformacion plastica y al incremento de la abrasion. Al incluir la capa de TiN, se incrementa la capacidad de carga, reduciendo la transferencia de material, y mejorando la resistencia al desgaste. Titanium based thin films (Ti/S, TiN/S, Ti/TiN/S, S: Substrate) were deposited using DC Magnetron sputtering on 316L stainless steel substrates. Superficial, mechanical properties, interface adhesion and tribological behavior of the obtained compounds were evaluated. Crystalline structure of the obtained TiN was observed by XRD, determining a FCC crystalline structure. Hardness increases with application of a TiN layer (~17 GPa), but intrinsic stress and higher fragility causes low adhesion (~12 N). Metallic coating possesses predominately plastic behavior with low hardness (~7 GPa), but higher adhesion (~19N). Wear test were performed by Ball on Disk (BOD), using 440 stainless steel (440SS) and alumina (Al 2 O 3 ) counterpairs (6 mm diameter), 1N applied load and 10 cm/s speed. Morphological and chemical analyses were performed on the wear tracks and counterpair surface using profilometry and SEM/EDS. Highest wear coefficients were observed in the Ti coatings, due to low plastic deformation resistance and abrasion increasing. Including a TiN layer increases coating load capability, reducing material transferring and improving tribological behavior.