Published

2013-05-01

Characterising μ-AlTiN coating and assessing its performance during Ti-6Al-4V milling

Caracterización y desempeño del recubrimiento μ-AlTiN durante el fresado del Ti-6Al-4V

Keywords:

AlTiN coating, cathodic arc deposition, milling, Ti6Al4V alloy (en)
AlTiN, depósito por arco, fresado, aleación Ti6Al4V (es)

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Authors

  • Carlos Mauricio Moreno Téllez Universidad Pedagógica y Tecnológica de Colombia - UPTC
  • José Manuel Sánchez Centro de Estudios e Investigaciones Técnicas de Guipúzcoa and Universidad de Navarra
  • Oscar Fabián Higuera Cobos Universidad Pedagógica y Tecnológica de Colombia - UPTC

This study investigated the mechanical properties and performance of μ-AlTiN coating deposited by PVD cathodic arc technique for a specific Al0, 67Ti0, 33N composition deposited on a WC-Co and AISI D2 steel substrate. The structure of the coating was analysed using SEM, EDAX, XRD, AFM and TEM. Nano indentation measurements were used for analysing mechanical properties; the coating’s performance was evaluated during the milling of a titanium alloy (Ti6Al4V). The TiN film was initially deposited to improve adhesion between coating and substrate, where columnar grains ranging in size from 200 to 500 nm were observed having NaCl-type structure. μ-AlTiN grain growth was also columnar but had ~50 nm grain size. The μ-AlTiN coated tool life was compared to an uncoated tool to determine the coating’s influence during Ti6Al4V milling. The μ-AlTiN coating improved tool life by 100% compared to that of an uncoated tool due to aluminium oxide and TiC formation on the surface and a decrease in friction coefficient between the chip and the tool.

Las propiedades mecánicas y el desempeño del recubrimiento μ-AlTiN depositado por la técnica PVD por arco catódico ha sido investigada para una composición específica de Al0,67Ti0,33N depositada en sustrato de WC-Co y acero AISI D2; su estructura fue analizada usando SEM, EDAX, DRX, AFM y TEM, y las propiedades mecánicas se analizaron a partir de medidas de nanoindentación. El desempeño del recubrimiento fue evaluado durante el fresado de una aleación de titanio (Ti6Al4V). Una película de TiN fue depositada inicialmente para aumentar la adhesión del recubrimiento con el sustrato, donde se observan granos columnares entre 200 y 500 nm de estructura tipo NaCl y crecimiento de granos del μ-AlTiN también columnares con tamaño de grano ~50 nm. La vida de la herramienta recubierta fue comparada con otra sin recubrir para determinar la influencia del recubrimiento durante el fresado del Ti6Al4V. El recubrimiento μ-AlTiN mejora la vida de la herramienta en un 100% respecto a la herramienta sin recubrir, debido a la formación de un óxido de aluminio y TiC en la superficie y en la disminución del coeficiente de fricción entre el chip y la herramienta.

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