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Oxidation Behavior at 1600 °C of Si-SiC-ZrB2 Composites Produced by Si Reactive Infiltration


  • The authors are deeply grateful to Erbicol SA for having performed reactive infiltrations on the preforms and for the sample cutting and milling.



Si–SiC–ZrB2 are produced by the reactive infiltration with molten silicon in porous SiC–C–ZrB2 preforms. It is observed that oxidized Si–SiC–ZrB2 ceramics present a layered structure composed of an outer layer of silica and a borosilicate glass intermediate layer with ZrO2 particles and the unoxidized bulk material. The graphs show that the passivation is very effective already after 5 min of oxidation. The thermograms do not vary significantly when the oxidation times are increased.