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A Niobium disilicide (NbSi2) layer was formed at the surface of Nb plates by heating those plates with Si powder and a piece of Na at 10001200K for 148 h. The thickness of the NbSi2 layer increased to 129µm with increasing temperature and in proportion to the square root of the heating time. The activation energy of the NbSi2 layer formation evaluated from the Arrhenius plot of parabolic growth constants was 160 kJmol1. NbSi2-coated Nb plates retained their shapes after heating at 11001700K for 10 h in air. Oxidation of the inner Nb of the plates was prevented. [doi:10.2320/matertrans.MAW201213

Preparation of Niobium Disilicide Coating by Heating Niobium in a Sodium&ndash;Silicon Melt

Preparation of Niobium Disilicide Coating by Heating Niobium in a Sodium–Silicon Melt