Abstract
In the previous paper, the authors ascertained that when the steel samples containing Al or Mn were analysed by the vacuum fusion method, the O values decreased quantitatively with the increase of such elements.
In this paper, the following are dealt with:(1) Relations between the above-mentioned phenomenon, the temperatures of the inner wall of the apparatus, of the Mo-hood covering the graphite crucible, and then the components (Fe, Al, or Mn) of the condensed film on the inner wall surface.(2) The analysis of the residues in the crucible revealed the increasing tendency of Mn and Al vaporization proportional to each content.
On these experimental results, it is concluded that when the samples containing Al or Mn are molten, the vapour pressures of these elements are remarkably high comparing with other metals and so the vapourized quantities become larger.
Consequently, a film containing Fe, Al or Mn is formed on the inner wall of the apparatus and adsorbs the extracted CO gas.Thus the 0 values determined are lowered.
