Rupture Phenomena of Molten Alkali Silicate Thin Films

抄録

The rupture length of the iron bearing alkali silicate thin films (the K₂O· 2SiO₂, K₂O·2SiO₂ and Na₂O·2SiO₂ –Fe₂O₃ systems) are measured as a function of the silica content, the Fe₂O₃ content, temperature, and the drawn out rate. In these melts, it is found that the rupture length, L, depends on the drawn-out rate, ν, at the high drawn-out rate conditions, but is independent from the drawn-out rate at the low drawn-out conditions. For all the systems of K₂O–SiO₂ and Na₂O–SiO₂ –Fe₂O₃, the rupture length (L) at the high drawn out rate conditions is found to be proportional to the -2/3 of the power of the drawn-out rate (ν),

L ∝ (ν)^-2/3

The rupture length at the low drawn-out rate strongly depends on the SiO₂ and Fe₂O₃ contents, but not temperature and drawn-out rate. From these results, it is confirmed that the rupture length at the low drawn-out rate is determined by the Si–O bond strength of the silicate tetrahedral units.