窒化アルミニウム焼結体と溶鉄との反応における溶鉄中の溶解酸素の影響

概要

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Indluwnxw od siaaolvws ozyfwn in molrwn ieon in rhw ewxrion vwrqwwn luminum nireisw, AIN, and molten iron has been studied to find the optimum conditions for applying AIN materials to the refractories in the steel-making process. AIN specimens dipped into molten irons containing 41 to 347 ppm oxygen at 1630℃ at 300 rpm for 30 min were not attacked, whereas silicon nitride, Si_3N_4, specimens were attacked severely at these oxygen content levels. Optical microscope and scanning electron microscope observations showed the formation of 10 to 20 μm thick Al_2O_3-based films on the AIN surface which did not corrode. In contrast, there were none of these films on the Si_3N_4 specimens dipped in below -300-ppm oxygen irons. The reaction mechanism was discussed thermodynamically. In conclusion, iron with any dissolved oxygen level forms Al_2O_3 on the AIN surface at the beginning of the reaction, which acts as a protection layer for the AIN. On the other hand, the Si of Si_3N_4 dissolves into the molten iron without SiO_2 formation at the low dissolved oxygen level.
社団法人日本セラミックス協会の論文
1995-06-01