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- Title
Enhanced sulphidation/oxidation resistance of Ti-45 Al-8 Nb alloy by nanostructured Cr Al YN/ Cr N coatings at 750 °C.
- Authors
Dudziak, T.; Du, H. L.; Datta, P. K.; Ehiasarian, A. P.; Reinhard, C.; Hovsepian, P. Eh.
- Abstract
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 H2/H2S/H2O 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)2O3 with a tiny sulphur content, whilst others developed a porous non-protective TiO2 + Al2O3 scale as well with a tiny sulphur content.
- Subjects
METALLURGICAL analysis; METALLIC composites; ALLOYS; NATIVE element minerals; SULFIDATION; OXIDATION; PROPERTIES of matter
- Publication
Materials & Corrosion / Werkstoffe und Korrosion, 2014, Vol 65, Issue 1, p45
- ISSN
0947-5117
- Publication type
Article
- DOI
10.1002/maco.201106417