a b s t r a c tA Mo-Si-B based coating was prepared on an Nb SS /Nb 5 Si 3 composite by a two-step process consisting of the initial deposition of Mo followed by pack cementation co-deposition of Si and B. After a conditioning treatment, an aluminoborosilica layer fully covered the sample. Following oxidation at 1300 • C for 24 h, the coated sample demonstrated a weight loss of about 0.55 mg/cm 2 and the uncoated sample exhibited catastrophic oxidation with a weight gain of 87.6 mg/cm 2 . These results demonstrate that the Mo-Si-B based coating can enable the use of the Nb SS /Nb 5 Si 3 composites at temperature up to 1300 • C in an oxidizing environment.
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 À2 after TGA testing at 1300°C for 24 h.
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