Air oxidation behaviour of standard PVD and novel HIPIMS coatings at 750°C for 1000 h

Abstract

High temperature oxidation resistance of Al 2 Au and TiAlCr standard PVD coatings and novel nano-structured CrAlYN/CrN coatings developed by HIPIMS technology was studied at 750uC for 1000 h. The results showed better high temperature oxidation resistance offered by HIPIMS coatings where protective oxide scales formed rich in Al and Cr, with lack of spallation and low mass gain during whole test duration was observed. In contrast Al 2 Au and TiAlCr coated materials showed thicker oxide scales, the samples coated by Al 2 Au and TiAlCr TiAl-8Nb alloy showed poorer corrosion resistance in air than that offered by the uncoated alloy. Post exposure analyses were performed by means of scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS).

Deposição e caracterização de filmes finos de CrN depositados por diferentes processos de <i>magnetron sputtering</i>

“…A vantagem de se utilizar a tecnologia HiPIMS é que pelo fato de trabalhar com menores taxas de deposição promove qualidade na produção dos revestimentos, permitindo, dessa forma, alta densidade, resistência à oxidação e durezas superiores, bem como excelente adesão ao substrato, quando comparados aos processos convencionais de vaporização a arco e pulverização catódica de alvos magnetrons com corrente contínua (Dudziak et al, 2015).…”