This study investigated the influence of the viscoelastic property of slag when producing glass fiber, MFS631 with 60% of manganese slag, 30% of steel slag, and 10% of silica stone. To fabricate the MFS631 glass bulk, slag materials were placed in an alumina crucible, melted at 1,550℃ for 2 h, and then annealed at 600℃ for 2 h. It was found that glass is non-crystalline through X-ray diffraction analysis. MFS631 fiber was produced at speed in the range of 100~300 rpm at 1,150℃. The loss modulus (G″) and storage modulus (G′) of the produced glass fiber were evaluated at high temperatures. G′ and G″ of MFS631 were greater than 893℃, and the modulus value was 136,860 pa. This is similar to the results of a general E-glass fiber graph. Therefore, it was concluded that its spinnability is similar to that of E-glass fiber; therefore, it can be commercialized.

In this study, the effect of vanadium oxide (V₂O₅) content and pre-sintering atmosphere on sealing property of glass frit that consisted of V₂O₅-BaO-ZnO-P₂O₅-TeO₂-CuO-Fe₂O₃ SeO₂ was investigated by XPS (X-ray photoelectron spectroscopy). The content of V₂O₅ was changed to 15, 30, and 45 mol%, and the pre-sintering was carried out in air and N₂ condition, respectively. XPS analysis conducted before and after laser irradiation with identical sample. Before laser treatment, glass frits that were pre-sintered at air condition showed both V₄₊and V₅₊, but the valence state was changed to V₅₊ after laser irradiation when the glass frits contained 30 and 45 mol% V₂O₅; this change led to non-adhesive property. On the other hand, glass frits that were pre-sintered at N₂ condition exhibited only V₄₊ and it showed fine adhesion irrespective of the V₂O₅ content. As a result, the existence of V₄₊ seems to be a major factor for controlling the adhesive property of glass frit for laser sealing.