Oxidation Resistance of Mo Coated with Mo(Si,Al)2 Layer Prepared by Dipping into Liquid of Al-25 mass%Si alloy

Shinsuke Kunitsugu; Norihide Nishida; Takao Tomiya; Masahiro Nagae; Makoto Nakanishi; Tatsuo Fujii; Jun Takada

doi:10.2320/matertrans.46.215

Oxidation Resistance of Mo Coated with Mo(Si,Al)₂ Layer Prepared by Dipping into Liquid of Al-25 mass%Si alloy

Shinsuke Kunitsugu, Norihide Nishida, Takao Tomiya, Masahiro Nagae, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

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Keywords: dip-coating, aluminum-silicon alloy, molybdenum aluminosilicide, oxidation resistance

JOURNAL FREE ACCESS

2005 Volume 46 Issue 2 Pages 215-218

DOI https://doi.org/10.2320/matertrans.46.215

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Abstract

A homogeneous layer of molybdenum alumininosilicide Mo(Si,Al)₂ with C(40) structure was made on the sample surface of molybdenum by dip-coating technique using Al-25 mass%Si liquid at 1123 K. Adherent Al-Si was removed by soaking the dipped samples in the NaOH saturated hydraulic solution. The Mo samples coated with the Mo(Si,Al)₂ layer were found to have excellent oxidation resistance in air even at 1473 K due to formation of a dense alumina film on the sample surface during oxidation. The formation of Mo₅(Si,Al)₃ layer was also observed at the interface between the Mo substrate and the Mo(Si,Al)₂ layer.

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