抄録
The mechanism of the deoxidation of liquid iron with Si and the formation of Si02 inclusions during solidification were studied on the basis of the various facts.
The conclusions obtained were as follows.
1) The deoxidation reaction is not completed immediately after addition of Si and the supersaturation in liquid iron continues for several minutes.
2) The SiO2 particle does not grow by the collision and coalescence with other particles, but grows principally by the diffusion of the solute atoms in the melt.
3) The growth of SiO2 particle is controlled by the interfacial reaction.
4) The progress of the interfacial reaction is represented by the following equation.
SiO2+O (abs) =Si+2O+O (ads)
5) The process of the deoxidation with Si should be discussed taking account of the isolation of the SiO2 inclusion from the melt and the decrease of the concentration of the dissolved oxygen.
6) The process of the deoxidation and the formation of SiO2 inclusions during solidification are definitely influenced by nucleation and growth.
