Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/12888
Title: Effects of O addition on the thermal behaviour of hard W-N sputtered coatings
Authors: Louro, C. 
Oliveira, J. C. 
Cavaleiro, A. 
Keywords: Tungsten oxynitride; Sputtering; Thermal behaviour; HT-XRD; Hardness
Issue Date: 16-Jun-2009
Publisher: Elsevier Ltd.
Citation: Vacuum. 83:10 (2009) 1224-1227
Abstract: 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
URI: http://hdl.handle.net/10316/12888
ISSN: 0042-207X
Rights: openAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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