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Abstract
Synthesis and sintering of ReSi 1.75 were simultaneously performed by a spark plasma sintering method, using the mixed powders of elemental Re and Si. The interface structure between Re and Si changed with temperature as follows: Re/ReSi 1.75/Si, Re/Re 5Si 3/ReSi 1.75, and Re/Re 5Si 3/ReSi/ReSi 1.75. On the basis of the results on the interfacial reaction, a compact body consisting of the single phase ReSi 1.75 could be easily fabricated. In addition, oxidation tests of ReSi 1.75 were carried out in air at temperatures ranging from 773 to 1473 K. Although a silica scale was formed on ReSi 1.75 at all temperatures by the evaporation of Re 2O 7, the formation of a protective silica scale was observed at 1273 K and above. The effect of vapor pressures of metal oxides on the formation of a silica scale was also discussed.
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