Cyclic oxidation of sputter-deposited nanocrystalline Fe-Cr-Ni-Al alloy coatings
- Univ. of Auckland (New Zealand). Dept. of Chemical and Materials Engineering
Nanocrystalline coatings of AISI 310S stainless steel with a small amount of Al were produced using unbalanced magnetron-sputter deposition with a composite target. Cyclic oxidation tests were performed at 800 and 900 C in air for 100 hr. The results showed that Al{sub 2}O{sub 3} scales formed on the coatings containing {approximately}3 wt.% Al. The oxidation rate of the coated specimens was much lower than that of the uncoated specimens and the scale spallation resistance was also improved significantly. Studies with atomic force microscopy (AFM) of the transient-oxidation surfaces suggested that grain-boundary and subgrain-boundary diffusion in the coatings may have played an important role in promoting the formation of the Al{sub 2}O{sub 3} scale. Fast creep of the fine-grain coating and alumina scale was considered to be the mechanism for the improvement in spallation resistance.
- OSTI ID:
- 351486
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 5-6 Vol. 51; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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