Abstract
This study reports the oxidation behavior of hot-pressed ZrB2 ceramics, with 10, 20 and 40 vol.% MoSi2 additives, exposed to dry air at 1500 °C for up to 10 h. The effect of the amount added MoSi2 on oxidation resistance was assessed. Quantitative electron microprobe characterizations of the oxidized ZrB2 with MoSi2 additives were carried out with electron probe micro analysis. Parabolic oxidation behavior was observed for the three compositions. The oxidation resistance was significantly improved with MoSi2 additives. Reaction-product phase compositions and phase distribution were thoroughly characterized from the oxidized surface through to the unreactive bulk material. It was found that the oxidation products consisted of nonstoichiometric amorphous SiO2, stoichiometric crystalline ZrO2, and MoB. The amounts of these phases in the oxidized reactive region were qualitatively determined.
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