Si_3N_4を添加したSiCの高温コロージョン挙動

概要

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In this work, the hot-corrosion behavior of silicon nitride-bonded silicon carbide composite (SCN) in aluminum melt are studied especially on the similar environment to the actual working condition. The thermal shock resistance and cyclic thermal shock behavior of this composite are also studied. Pre-oxidized specimens corroded more extensively than as-cut specimens in Al melt at the same temperature. The specimens, which were pre-oxidized and immersed in Al melt, showed a severe reduction in their mean compressive strength. The mass changes of SCN oxidized at 850℃-1200℃ followed parabolic kinetics but pore neck blocking happened at 1200℃. The activation energy was found to be 223 kJ/mol. In water quenching test of SCN composite, the critical thermal shock temperature difference was about 425℃. The repeated thermal stress by the cyclic heating and cooling caused the decrease in strength.
社団法人日本セラミックス協会の論文
2001-01-01