Mo–Si–B Coating for Improved Oxidation Resistance of Niobium | Zendy

LuSteffes Otto J. | Zendy; Su Linfen | Zendy; Jackson Dana M. | Zendy; Perepezko John H. | Zendy

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Mo–Si–B Coating for Improved Oxidation Resistance of Niobium

Author(s) -

LuSteffes Otto J.,

Su Linfen,

Jackson Dana M.,

Perepezko John H.

Publication year - 2015

Publication title -

advanced engineering materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.938

H-Index - 114

eISSN - 1527-2648

pISSN - 1438-1656

DOI - 10.1002/adem.201400438

Subject(s) - coating , materials science , niobium , cementation (geology) , molybdenum , metallurgy , layer (electronics) , deposition (geology) , boron , composite material , chemistry , paleontology , organic chemistry , cement , sediment , biology

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 NbB 2 during the pack cementation process. A revised coating treatment was implemented using TiB 2 as the boron source to reduce the NbB 2 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.

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