Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/4205
Title: Thermal stability of reactive sputtered tungsten oxide coatings
Authors: Parreira, N. M. G. 
Polcar, T. 
Cavaleiro, A. 
Keywords: Tungsten oxide; Reactive sputtering; Structural characterization; Thermal stability
Issue Date: 2007
Citation: Surface and Coatings Technology. 201:16-17 (2007) 7076-7082
Abstract: The thermal stability of different W-O coatings, W100, W90O10, W54O46, W30O70 and W25O75, were studied by in-situ X-ray diffraction at elevated temperatures up to 900 °C. The coatings were deposited by DC reactive magnetron sputtering from a pure tungsten target in an Ar + O2 atmosphere onto Fecralloy alloy. The evolution of the structure of the coatings was studied in both protective and oxidant atmospheres. Three groups of films were identified: (1) W25O75 which showed structural evolution following the W-O phase diagram; (2) amorphous O-deficient WO3 whose structure followed the W-O phase diagram either as WO3 or as its chemical composition depending on annealing in oxidant or protective atmospheres, respectively; and (3) low O-content crystalline films that oxidized from 500 °C.
URI: http://hdl.handle.net/10316/4205
DOI: 10.1016/j.surfcoat.2007.01.019
Rights: openAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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