1500℃でのジルコンの焼結におよぼす酸化物の影響

概要

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Twenty-eight kinds of oxides, in amounts up to five weight per cent, were added into zircon in order to investigate their effects on decrement of apparent porosity and dissociation of zircon refractories during sintering at 1500℃ Na_2O, K_2O, MgO, CaO, ZnO, B_2O_3, MnO_2, Fe_2O_3, Co_2O_3, and NiO promoted markedly sintering of zircon. Cu_2O, CuO, BeO, CeO_2, TiO_2, P_2O_5, SrO, and BaO did slightly, but ThO_2, Al_2O_3, SnO, Pb_2O, PbO, V_2O_5, SeO_2, Cr_2O_3, MoO_3 and WO_3 did not. Among the oxides that promoted sintering of zircon, Cu_2O, CuO, BeO, CeO_2, TiO_2, P_2O_5 Fe_2O_3, NiO, ZnO MnO_2 and Co_2O_3 had almost no effect on the dissociation of zircon at 1500℃. When specimens contained these oxides were kept for two hours at 1600℃. The dissociation of zircon was not affected by addition of BeO, ZnO, Fe_2O_3 nor NiO, whereas it was affected a little by addition of Cu_2O or Co_2O_3, and markedly by addition of TiO_2. The result of slagging test for specimens containing Fe_2O_3, ZnO, or Co_2O_3 was satisfied but that for Cu_2O, or NiO was unsatisfied. Conclusively, zircon refractories containing a little amount of Fe_2O_3, ZnO, or Co_2O_3 had lower apparent porosity without little dissociation of zircon at 1500℃ and had better result for slagging test.
社団法人日本鉄鋼協会の論文
1970-11-01