TY - GEN
T1 - Xps analysis of oxide formed on the surface of co-28cr-6mo-1si alloy oxidized at 550 ºc
AU - Tunthawiroon, Phacharaphon
AU - Kitiwan, Mettaya
AU - Wongpromrat, Patthranit
AU - Chiba, Akihiko
N1 - Publisher Copyright:
© 2020 Trans Tech Publications Ltd, Switzerland.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020
Y1 - 2020
N2 - This work investigated the influence of oxidation durations on the formation of oxide on the surface of wrought Co-28Cr-6Mo-1Si alloy. The iso-thermal oxidation was individually performed in air at 550ºC for 4, 12 and 24 h. For comparison, the surface of the non-oxidized Co-28Cr-6Mo-1Si alloy was concurrently examined. The chemical compositions of the non-oxidized and oxidized alloys were principally analyzed via X-ray photoelectron spectroscopy (XPS). The XPS results revealed that the surface of the non-oxidized alloy enriched in Cr-oxide. After oxidation treatment, the Co-oxide, existing as Co2+ state was observed coexisting with two Cr-oxide states, Cr3+ and Cr4+. The low concentrations of Mo6+ were also observed on the oxidized alloy surface. With the increase in oxidation durations, the Co-oxide was suppressed by Cr-oxide. The XPS depth profile analysis indicated that the thickness of the oxide film increased with increasing the oxidation duration.
AB - This work investigated the influence of oxidation durations on the formation of oxide on the surface of wrought Co-28Cr-6Mo-1Si alloy. The iso-thermal oxidation was individually performed in air at 550ºC for 4, 12 and 24 h. For comparison, the surface of the non-oxidized Co-28Cr-6Mo-1Si alloy was concurrently examined. The chemical compositions of the non-oxidized and oxidized alloys were principally analyzed via X-ray photoelectron spectroscopy (XPS). The XPS results revealed that the surface of the non-oxidized alloy enriched in Cr-oxide. After oxidation treatment, the Co-oxide, existing as Co2+ state was observed coexisting with two Cr-oxide states, Cr3+ and Cr4+. The low concentrations of Mo6+ were also observed on the oxidized alloy surface. With the increase in oxidation durations, the Co-oxide was suppressed by Cr-oxide. The XPS depth profile analysis indicated that the thickness of the oxide film increased with increasing the oxidation duration.
KW - Co-Cr-Mo alloys
KW - Dental
KW - Dental restoration
KW - Oxidation
KW - Oxide film
KW - PFM
KW - XPS analysis
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U2 - 10.4028/www.scientific.net/KEM.845.95
DO - 10.4028/www.scientific.net/KEM.845.95
M3 - Conference contribution
AN - SCOPUS:85087021484
SN - 9783035716009
T3 - Key Engineering Materials
SP - 95
EP - 100
BT - Functional Materials
A2 - Yin, Shu
A2 - Pesin, Alexander
PB - Trans Tech Publications Ltd
T2 - International Conference on Functional Materials, ICFM 2019
Y2 - 4 September 2019 through 6 September 2019
ER -