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Enhanced sulphidation/oxidation resistance of Ti–45 A l–8 N b alloy by nanostructured Cr A l YN / C r N coatings at 750 °C
Author(s) -
Dudziak T.,
Du H. L.,
Datta P. K.,
Ehiasarian A. P.,
Reinhard C.,
Hovsepian P. Eh.
Publication year - 2014
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201106417
Subject(s) - high power impulse magnetron sputtering , materials science , alloy , metallurgy , sputter deposition , cavity magnetron , oxide , sulfur , chemical engineering , sputtering , thin film , nanotechnology , engineering
This paper discusses the sulphidation/oxidation protection offered by multilayer CrAlYN/CrN coatings etched by Cr, CrAl and Y ions, deposited by a combined high power impulse magnetron sputtering (HIPIMS)/unbalanced magnetron sputtering (UBM) technique on a Ti–45Al–8Nb alloy (at%). The test was performed at 750 °C in an environment of H 2 /H 2 S/H 2 O yielding low oxygen (10 −18 Pa) and high sulphur (10 −1 Pa) partial pressures for up to 1000 h. The results show that all the exposed materials underwent uneven degradation; some places developed a thin protective oxide scale (Al,Cr) 2 O 3 with a tiny sulphur content, whilst others developed a porous non‐protective TiO 2 + Al 2 O 3 scale as well with a tiny sulphur content.