Abstract
In the process of glass-ceramics prepared with Baotou steel blast furnace slag, quartz sand, and other raw materials by melting method, the mutual influence of the special components such as CaF2, REXOY, TiO2, K2O, and Na2O in the blast furnace slag on the crystallization behavior of parent glass was investigated using differential thermal analysis (DTA) and X-ray diffraction (XRD). The results show that the special components in slag can reduce the crystallization temperature and promote crystallization of glass phase, which belongs to surface crystallization of glass, and they cannot play the role of the nucleating agent; the major crystal phase composed of diopside, diopside containing aluminum and anorthite, is slightly different from the expected main crystal phase of diopside. Therefore, the nucleating agents of proper species and quantity must be added into the raw materials in order to obtain glass-ceramics. The results have important theoretical guidance meaning for realizing industrial production of Baotou steel blast furnace slag glass-ceramics preparation.
Highlights
Glass-ceramics are uniform polycrystalline materials with glasses and crystals, which are processed and formed as glasses and converted into a crystalline ceramic by a subsequent heat treatment [1, 2]
In the process of glass-ceramics prepared with Baotou steel blast furnace slag, quartz sand, and other raw materials by melting method, the mutual influence of the special components such as CaF2, REX OY, TiO2, K2O, and Na2O in the blast furnace slag on the crystallization behavior of parent glass was investigated using differential thermal analysis (DTA) and X-ray diffraction (XRD)
The results show that the special components in slag can reduce the crystallization temperature and promote crystallization of glass phase, which belongs to surface crystallization of glass, and they cannot play the role of the nucleating agent; the major crystal phase composed of diopside, diopside containing aluminum and anorthite, is slightly different from the expected main crystal phase of diopside
Summary
Glass-ceramics are uniform polycrystalline materials with glasses and crystals, which are processed and formed as glasses and converted into a crystalline ceramic by a subsequent heat treatment [1, 2]. CaF2 and TiO2 can act as nucleating agent to promote crystallization of glass [12,13,14], and K2O and Na2O can decrease the melting point of glass, but there are few reports so far regarding the effect of REX OY , Nb2O5, and ThO2 on the crystallization behavior of glass in the process of glassceramics prepared These special components make the crystallization behavior of glass-ceramics prepared from blast furnace slag become more complex, and the related theory of glass-ceramics prepared from ordinary blast furnace slag is not completely applicable to Baotou steel blast furnace slag. The results are a supplement to the theory of slag glass-ceramics preparation, and had theoretical guidance meaning and practical reference value for realizing industrial production of Baotou steel blast furnace slag glass-ceramics preparation
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