Chemical Composition of Inclusions Observed in High-purity Iron Ingots Melted in an Alumina Crucible

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  • アルミナるつぼで溶解した高純度鉄中に観察される介在物の組成
  • アルミナ ルツボ デ ヨウカイシタ コウ ジュンド テツ チュウ ニ カンサツ

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The purpose of the present work is to investigate the contamination of molten iron with crucible materials during the melting process.<BR>High purity iron was melted at 1873 K for 900 s in an alumina crucible by use of a tungstenmesh heater furnace, and the ingot was subjected to the chemical analysis. The cross section of the ingot was deeply etched electrolytically and was observed with a scanning electron microscope. From the deeply etched cross section, inclusions were extracted onto a carbon film ancl the chemical composition was analyzed with an analytical electron microscope.<BR>The results are as follows:<BR>(1) Iron was contaminated with silicon during the melting process. The extent of the contamination depended on the silica content of the crucible.<BR>(2) By use of an alumina crucible which contains silica by only 0.005 mass%, the contamination of melt was suppressed.<BR>(3) The silicon content of inclusions depended on both the silicon and oxygen contents of ingots. It can be estimated by the equilibrium relationship and the change in melt composition during solidification.

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