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https://hdl.handle.net/10316/4205
Título: | Thermal stability of reactive sputtered tungsten oxide coatings | Autor: | Parreira, N. M. G. Polcar, T. Cavaleiro, A. |
Palavras-chave: | Tungsten oxide; Reactive sputtering; Structural characterization; Thermal stability | Data: | 2007 | Citação: | Surface and Coatings Technology. 201:16-17 (2007) 7076-7082 | Resumo: | 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: | https://hdl.handle.net/10316/4205 | DOI: | 10.1016/j.surfcoat.2007.01.019 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Eng.Mecânica - Artigos em Revistas Internacionais |
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file02d94b0d904f439e9bcc3a4657556c3e.pdf | 462.55 kB | Adobe PDF | Ver/Abrir |
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