High-temperature oxidation behavior of ZrO₂-ZrSiO₄/NiCr composites and its applicability for functionally graded materials

Titelangaben

Wu, Kangjian ; Rosin, Andreas ; Park, Ho-Seon ; Willert-Porada, Monika:
High-temperature oxidation behavior of ZrO₂-ZrSiO₄/NiCr composites and its applicability for functionally graded materials.
In: Journal of Physics: Conference Series. Bd. 419 (2013) . - 012013.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/419/1/012013

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Abstract

In the present study, high-temperature oxidation behavior of pressurelessly sintered ZrO2-ZrSiO4/NiCr8020 samples with different volume fractions of ceramic is investigated with the aim to develop oxidation resistant ZrO2-ZrSiO4/NiCr functionally graded materials out of them. Sintered samples with 0, 25, 50 and 75 vol% ceramic were oxidized at 1000 °C for 36 h in synthetic air. The oxidation kinetics depends strongly upon the phase connectivity of NiCr in the ceramic matrix, which also governs the crack pattern formed due to the volume expansion of NiCr particles. While nearly full oxidation of the NiCr particles occurs in the 75 vol% ceramic composite with a relatively low phase connectivity of NiCr, the 25 vol% ceramic composite with a highly percolative NiCr phase exhibits a metal-like oxidation behavior and its overall oxidation was limited to the surface near area.