溶融 Ni および Ni-Fe 合金の珪素による脱酸平衡

概要

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The deoxidation of liquid nickle with silicon was studied at the temperature ranging from 1500℃ to 1650℃ using silica crucible in order to investigate the deoxidation of nickel based alloys. The effect of temperature on the equilibrium constant of the deoxidation reaction was found to be : log K_<Si(Ni)>=-15680/T+1.83 1500∿1650℃ while the deoxidation product of nickle, log K'_<Si(Ni)>(=[%Si][%O]^2), was expressed as follows : log K'_<Si(Ni)>=log K_<Si(Ni)>-0.06[%Si]Si<2%, 1500∿1650℃ The deoxidation of nickle-iron binary with silicon was measured over the all range of the binary system including pure iron at temperatures of 1600℃ and 1650℃. On the nickle basis, the deoxidation product of nickle-iron alloy, log K'_<Si(Ni-Fe)>, which increased by the addition of iron, was empirically represented to be : log K'_<Si(Ni-Fe)>=log K_<Si(Ni)>-(288/T-0.197)[%Fe] Fe<20%, 0.5%Si, 1600∿1650℃ The temperature dependence of the equilibrium constant for the deoxidation of iron, log K_<Si(Fe)>, was given by the expression : log K_<Si(Fe)>=-30960/T+11.86 1550∿1650℃ On the iron basis, the value of log K'_<Si(Fe-Ni)>, which decreased with increasing nickle content, was calculated as : log K'_<Si(Fe-Ni)>=log K_<Si(Fe)>-0.01[%Ni] Ni<60%, 0.5%Si, 1600∿1650℃
社団法人日本鉄鋼協会の論文
1989-12-01