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研究了1300—1600℃温度间 Ti-Si-Ca-O 系的相关系。1300℃时 Ti-Si-O 亚系中 Ti_2O_3与 Ti_5Si_3和 SiO_2共存。硅化物Ti_5Si_4、TiSi、TiSi_2除了与金属硅之外,也和 SiO_2共存。1600℃时 Ti_5Si_3与 TiO+Ti_2O_3,Ti_2O_3+SiO_2,以及 SiO_2+Ti_5Si_4共存。具有40%(原子)Ti 的液态 Si-Ti 合金与 SiO_2共存。在 CaO-Ti_2O_3-SiO_2 亚系中有一种石榴石结构a=12.165±0.001的三元相 Ca_3Ti_2Si_3O_(12),还有二元化合物 Ca_2Ti_2O_5与 Ca_8Ti_6O_(17),发现后面这两种化合物是CaTiO_(1+x)和 Ca_4Ti_3O_(4+3x)固溶系组成部分,其中前者具有钙钛矿结构。发现在 CaO-Ti_2O_3—SiO_2系中能与所有三相组合物平衡的金属相是 Si 含量仅小量变化的化合物 Ti_5Si_3(熔点=2125℃).为了在1600℃时由硅热还原钛的氧化物得到液态金属和渣,必须用过量的 Si 来获得40%原子(52重量%)Ti(或低于此)的硅钛合金。
The phase relationship of Ti-Si-Ca-O system at 1300-1600 ℃ was studied. The coexistence of Ti_2O_3 and Ti_5Si_3 and SiO_2 in Ti-Si-O sub-series at 1300 ℃. Silicide Ti_5Si_4, TiSi and TiSi_2 coexist with SiO_2 besides metal silicon. Ti_5Si_3 coexisted with TiO_ (Ti_2O_3), Ti_2O_3 + SiO_2, and SiO_2 + Ti_5Si_4 at 1600 ℃. Liquid Si-Ti alloy with 40% (atomic) Ti coexists with SiO 2. Among the CaO-Ti 2 O 3 -SiO 2 subunits, there is a ternary Ca_3Ti_2Si_3O_ (12) with garnet structure a = 12.165 ± 0.001 and binary compounds Ca_2Ti_2O_5 and Ca_8Ti_6O_ (17). The latter two compounds are found to be CaTiO_ + x) and Ca_4Ti_3O_ (4 + 3x) solid-solution systems, of which the former has a perovskite structure. It was found that the metal phase that can be balanced with all three-phase compositions in the CaO-Ti 2 O 3 -SiO 2 system is the compound Ti_5Si_3 (melting point = 2125 ° C) with only a small change in Si content In order to thermally reduce the titanium oxide To obtain liquid metal and slag, an excess of Si must be used to obtain a 40% atomic (52% wt) Ti (or below) silicon-titanium alloy.