耐アルカリ性BaO-SiO_2-TiO_2系ガラスの成形性の改善

概要

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In order to improve workability of alkali-resistant BaO-SiO_2- TiO_2, glasses, glass-forming ability was evaluated for various glass compositions obtained by partial replacement of 30 BaO, 30 SiO_2, 40 TiO_2, in mol% with Li_2O, Na_2O, CaO, SrO, Al_2O_3, and/or ZrO_2, (Tables 1 -4). Here, a parameter K_<gl>, was employed for estimating glass-forming ability. This was expressed as (T_c- T_g)/(T_l- T_c) by Hruby, where glass transition temperature T_g, crystallization temperature T_c, and liquidus temperature T_l are determined on the differential thermal analysis curves (Fig. 2) . It was found that the composition of 7.0 Na_2O, 5.75 CaO, 5. 75 SrO 11.5 BaO 30.0 SiO_2, 33.0 TiO_2, 7.O ZrO_2 in mol% gives the largest K_<gl> value among, , the examined compositions. Melt of this composition could be drawn into a continuous long fiber 8-15 pm in diameter and 50,000 m long with a specially designed double-crucible method (Fig. 3) . Glass fibers of this composition were confirmed to be alkali-resistant and showed no diameter reduction even after exposure to either Portland cement aqueous phase solution or a 2 N NaOH solution at 95℃ for 18 h.
社団法人日本セラミックス協会の論文
1988-07-01