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Tribological and wear behavior of HfN/VN nanomultilayer coated cutting tools
Comportamiento tribológico y desgaste de nanocapas de HfN / VN utilizadas en herramientas de corte
Keywords:
hard coatings, multinanolayers, tool wear, cutting tools (en)recubrimientos duros, multinanocapas de HfN / VN, desgaste de herramientas, herramientas de corte (es)
Wear and tribological behavior of [HfN/VN]n multinanolayers deposited via magnetron sputtering has been exhaustively studied in this work. Enhancement of both hardness and elastic modulus up to 37 GPa and 351 GPa, respectively, was observed as bilayer periods in the coatings were decreased. The sample with a bilayer period (Λ) of 15 nm and bilayer number n = 80, showed the lowest friction coefficient (∼0.15) and the highest critical load (72 N), corresponding to 2.2 and 1.38 times better than those values for the coating deposited with n = 1, respectively. Taking into account the latest results of tungsten carbide (WC) inserts were used as substrates to improve the mechanical and tribological properties of [HfN/VN]n coatings as a function of increased interface number and to manage higher efficiency of these coatings in different industrial applications, like machining and extrusion. Their physical, mechanical, and tribological characteristics were investigated, including cutting tests with AISI 1020 steel (workpiece) to assess wear as a function of the bilayer number and bilayer period. A comparison of the tribological properties revealed a decrease of flank wear (approximately 24%) for WC inserts coated with [HfN/VN]80 (Λ =15 nm), when compared to uncoated tungsten carbide inserts. These results demonstrate the possibility of using [HfN/VN] multilayers as new coatings for tool machining with excellent industrial performance.
Se ha estudiado de forma exhaustiva en este trabajo el desgaste y el comportamiento tribológico de multinanocapas (HfN / VN) depositados mediante pulverización catódica magnetrón. El mejoramiento de la dureza y el módulo de elasticidad de hasta 37 GPa y 351 GPa, respectivamente, se observaron cómo períodos de dos capas en los que se disminuyó el revestimiento. La muestra con un período de bicapa (Λ) de 15 nm y el número de bicapa n = 80 mostró el coeficiente más bajo de fricción (~ 0,15) y la más alta carga crítica (72 N), correspondiente a 2,2 y 1,38 veces mejor que los valores para el revestimiento depositado con n = 1, respectivamente. Teniendo en cuenta los últimos resultados de los insertos de carburo de tungsteno (WC), estos fueron utilizados como sustratos para mejorar las propiedades mecánicas y tribológicas de [ HfN / VN] n recubrimientos en función del aumento del número de interfaz y para gestionar de esta manera una mayor eficiencia de estos recubrimientos en diferentes sectores industriales, como el mecanizado y la extrusión. Sus características físicas, mecánicas, y tribológicas fueron investigadas, incluyendo las pruebas de corte con AISI 1020 acero (pieza de trabajo); para evaluar el desgaste como una función del número de bicapa y el período de bicapa. Una comparación de las propiedades tribológicas reveló una disminución del desgaste de flanco (alrededor de 24 %) para las inserciones WC recubiertas con [HfN / VN] 80 (Λ = 15 nm), cuando es comparado con los sistemas de carburo de tungsteno insertados y sin recubrir. Estos resultados abren la posibilidad de utilizar [HfN / VN] multicapas como nuevos recubrimientos para el mecanizado de herramientas con un excelente rendimiento industrial.
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