Premium
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.