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Oxidation behavior of a pressureless sintered ZrB2–MoSi2 ceramic composite

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Abstract

Ultra-refractory ceramic composites of composition ZrB2 + (5 to 20) vol% MoSi2 were produced by pressureless sintering at 1830 °C under argon atmosphere. Sintering cycles and microstructural analysis point out that at least 20 vol% molybdenum disilicide is necessary for obtaining a dense material. Thereafter, the composite 80 vol% ZrB2 + 20 vol% MoSi2 was used to test the thermal stability under oxidizing environment. Oxidation tests were carried out in flowing synthetic air in a thermogravimetric analyzer from 700 to 1400 °C with exposure time of 30 h. In the low-temperature range (700–1000 °C), the oxidation of the composite resembles that of monolithic ZrB2 ceramics, for temperatures >1200 °C the silica resulting from oxidation of molybdenum disilicide seals the sample surface, preventing zirconium diboride from fast degradation.

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Authors and Affiliations

  1. CNR-ISTEC, Institute of Science and Technology for Ceramics, I-48018, Faenza, Italy

    Diletta Sciti, Mylène Brach & Alida Bellosi

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  1. Diletta Sciti
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  2. Mylène Brach
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  3. Alida Bellosi
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Correspondence to Diletta Sciti.

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Sciti, D., Brach, M. & Bellosi, A. Oxidation behavior of a pressureless sintered ZrB2–MoSi2 ceramic composite. Journal of Materials Research 20, 922–930 (2005). https://doi.org/10.1557/JMR.2005.0111

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