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The application of a pack cementation coating of aluminum on Mo-rich Mo–Si–B alloys prior to oxygen exposure yields a significant improvement in the oxidation resistance over a wide temperature range (732–1372°C). Upon exposure to oxygen, the Mo 3 Al 8 -rich layer that forms during the aluminum pack cementation treatment develops a protective Al 2 O 3 layer on the surface...
During Si-pack cementation a MoSi 2 outer layer was synthesized on a Mo–Si–B alloy with a three-phase Mo+Mo 5 SiB 2 +Mo 3 Si microstructure. Following oxidation exposure, the MoSi 2 phase layer was replaced by B containing Mo 5 Si 3 (T 1 ) phase in contact with a Mo 5 SiB 2 layer. The synthesized T 1 phase provided...
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