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采用静态淬火法,并利用金相、x—射线粉末衍射、电子显微分析、x—射线能谱分析及化学分析等来测定淬火样品的物相及组成,对SiO_2—CaO(10%mol)-FeO-FeO_(1.5)体系在1300℃下的相平衡进行了实验研究,给出了此体系的相平衡截面图。氧化钙的加入使体系在整个浓度范围内都出现了熔体相,而且它全部溶解于熔体相中,因而是一种较好的溶剂;SiO_2-CaO(10%)-FeO-FeO_(1.5)体系的相图类似于SiO_3-FeO-FeO_(1.5)体系,但前者在富FeO_(1.5)区出现熔体相,此熔体相的组成接近于CaO20%,SiO_250%,FeO_(1.5)20%,FeO10%。在此组成附近,体系将出现一个均匀的熔体相。CaO(10%)不能阻止磁性氧化铁的析出。
The phase and composition of the quenched samples were characterized by means of static quenching and metallographic examination, x-ray powder diffraction, electron microscopy, X-ray energy dispersive spectroscopy and chemical analysis. The SiO 2 -CaO (10% mol) -FeO-FeO_ (1.5) system at 1300 ℃ was studied experimentally, and the phase equilibrium cross-section of this system was given. The addition of CaO makes the system appear in the whole concentration range of the melt phase, and it is all dissolved in the melt phase, which is a better solvent; SiO_2-CaO (10%) - FeO-FeO_ (1.5 ) System is similar to that of SiO_3-FeO-FeO_ (1.5) system. However, the former has a melt phase in the FeO_ (1.5) rich zone. The composition of the melt phase is close to that of CaO20%, SiO_250%, FeO_ (1.5) %, FeO10%. Around this composition, the system will have a homogeneous melt phase. CaO (10%) can not prevent the precipitation of magnetic iron oxide.