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- Title
Mo-Si-B Coating for Improved Oxidation Resistance of Niobium.
- Authors
Lu‐Steffes, Otto J.; Su, Linfen; Jackson, Dana M.; Perepezko, John H.
- Abstract
A Mo-Si-B based coating was applied to niobium that produced a coating structure composed of molybdenum and niobium silicides. Oxidation tests at 1000 °C and 1200 °C showed that the Mo-Si-B coating provided enhanced oxidation protection of niobium due to the formation of a protective aluminosilica layer. The coating performance was identified to be limited by the formation of NbB2 during the pack cementation process. A revised coating treatment was implemented using TiB2 as the boron source to reduce the NbB2 formation. The Mo-Si-B coating utilizing plasma spray deposition of Mo and a revised pack cementation exhibited a mass change of 0.44 mg cm−2 after TGA testing at 1300 °C for 24 h.
- Subjects
NIOBIUM; MOLYBDENUM; SILICIDES; OXIDATION; ALUMINUM silicates
- Publication
Advanced Engineering Materials, 2015, Vol 17, Issue 7, p1068
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201400438