固体鉄と共存する Al_2O_3, TiO_2 および SiO_2 の酸化性雰囲気加熱における挙動

概要

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In our previous investigation of the behavior of oxide inclusions in steels during hot-rolling, the specimens containing uniformly a certain amount of specific oxide inclusions were made using the powder metallurgical technique. These specimens were somewhat more porous than those manufactured by melting. When the specimens with high porosity were heated in the air, complex oxide inclusions were frequently formed in those specimens, because the oxide inclusions inserted were combined with the iron oxides which were formed during heating. This investigation was carried out to know how change would occur on Al_2O_3, TiO_2 and SiO_2 inclusions in the above specimens. Consequently, Al_2O_3, TiO_2 and SiO_2 changed easily into FeO・Al_2O_3 (Hercynite), 2FeO・TiO_2 (Pseudo-brookite) and 2FeO・SiO_2 (Fayalite) respectively. Particularly, the complex oxide 2FeO・TiO_2 was identified by various experiments, since, in our previous experiment, it could not be identified by A.S.T.M. cards. Furthermore, the rates of formation of the complex oxides were measured, by means of the X-ray diffraction technique, on the basis of the diffusion reaction between particles of the powder mixtures : Fe, Fe_2O_3 and simple oxides. The activation energy in the formation of those complex oxides was also calculated and discussed.
社団法人日本鉄鋼協会の論文
1968-07-01