Effects of O addition on the thermal behaviour of hard W-N sputtered coatings

• Autor(a) principal: Louro, C.
• Data de Publicação: 2009
• Outros Autores: Oliveira, J. C., Cavaleiro, A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/12888; https://doi.org/10.1016/j.vacuum.2009.03.015
• topic: Tungsten oxynitride; Sputtering; Thermal behaviour; HT-XRD; Hardness

The structural thermal behaviour of three W-O-N sputtered coatings with similar metalloid to metal ratio (~2.1) was investigated up to 900 °C after annealing in a vacuum tube furnace as well as in-situ HT-XRD under a controlled atmosphere of Ar-5%H2. The as-deposited microstructure of the coatings consisting in a nanocomposite of low-order W-O and W-N phases evaluated differently as a function of the oxygen content. The W-O-N film containing more than 27 at.% O delaminated severely from the steel substrates for temperatures as low as 500 °C. In opposite, for the coatings with less O content, the low range order of the as-deposited structure was maintained up to 800 °C and with further annealing crystallized into a mixture of WO2 and W2N. The thermal behaviour of the oxynitride films overcame that observed for oxygen-free nitride ones. This is due to the greater N content retaining during annealing treatment, in opposite to the W-N films which give rise to the single metallic [alpha]-W phase. The structural and compositional evolution supported the hardness behaviour obtained by the thermal treatment in protective ambiance