塗型の液体成分と耐火物質の砂型内への浸透性について

抄録

  Generally, core wash is composed of various coating refractories and carriers. It is common practice to select adequate coating refractories according to the kind of molten metal. As for carriers, usually, water or methanol are used. The selection of carriers, however, has been being made on the nature of dressing and the theoretical basis was not clearly understood.
  The authors studied the function of carriers and coating refractories noting a phenomenon of “penetration of coating refractories and carriers into the moulds.” The study of penetration into the moulds will save unnecessary penetration of carriers, minimize decrease in mould strength and defects in casting caused by carriers which remain inside of moulds. This study also will help to protect mould surface from the penetration of molten metals by adjusting the amount of penetration of coating refraotories into the moulds in accordance with the size of castings and materials concerned.
  The penetration of carriers and coating refractories into the moulds refers to characteristics by which carriers or coating refractories penetrate between moulding sands. When only carriers are used the factor which takes part in the phenomenon is considered to be the capillary effect which is a function of viscosity and surface tension of carriers.
  Furthermore, as for the penetration of coating refractories, it is considered that particle size, heat of wetting which is caused by the wetting of the surfaces and especially the degree of polarity of coating refractories and dipole moment of carriers influences the penetration of coating refractories.