OS3-4 ガス化溶融炉におけるNi基鋳造合金暴露試験(OS3 バイオマス・新燃料・環境技術,分散と集中の共存)

概要

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After examining practical structural materials for use in the high-temperature environments of waste incinerators, it was found that a Ni-Cr-W casting alloy is promising. However, the corrosion reaches its peak in the vicinity of 900℃. This peak is related to the behavior of chlorides that form in the interior of the alloy. As the chlorides continuously generate and decompose, the Cl recycles, accelerating corrosion. It is thought that when the temperature rises, the chlorides vaporize outside the alloy, suppressing Cl recycling and thus reducing the amount of corrosion. Adding Al to the alloy generates highly volatile AlCl_3, making it possible to prevent the accumulation of chlorides in the vicinity of 900℃ and lower the corrosion peak. As a result of conducting exposure testing for a year at an actual incinerator, it was demonstrated that adding Al is an effective way to improve corrosion resistance.
社団法人日本機械学会の論文
2006-06-28