高温熔渣具有大量显热与渣体.采用熔融法制备微晶玻璃可以更好地利用其热和渣,达到高效利用的目的.通过高温条件下混熔的方式制备性能稳定的基础玻璃.利用差示扫描量热仪(DSC)确定基础玻璃的热处理工艺制度.结合高分辨透射电子显微镜(TEM)、X射线衍射分析(XRD)、场发射扫描式电子显微镜(FE-SEM)对微晶玻璃的结构进行了研究.研究表明:基础玻璃中氟含量的增加,有利于促进微晶玻璃成核和晶体长大,降低微晶玻璃的形核结晶温度.在低温热处理得到微晶玻璃的主晶相为萤石,高温热处理得到的微晶玻璃析出了霞石和萤石两个微晶相.高炉渣微晶玻璃中,微晶相的出现可有效提高微晶玻璃的力学性能,试样的显微硬度最高可达585.68 MPa,抗折强度最高可达126.21 MPa.
Molten slag has a large amount of heat and slag.The preparation of glass-ceramics by melting method using molten slag can utilize the furnace slag efficiently.The parent glass with stable performance was prepared by mixed-melting at high temperature.The heat treatment process of the parent glass was determined by differential scanning calorimetry (DSC).The microstructure and properties of the glass-ceramics were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), scanning electron microscopy (FE-SEM).The results indicate that the increase of F content in the parent glass promot the nucleation and crystal growth and decrease the nucleation and crystallization temperature of the glass ceramics.The main crystal phase of glass-ceramics is fluorite at the low heat treatment temperature, nepheline and fluorite are precipitated simultaneously at high heat treatment temperature.The content and type of crystalline phase significantly influence the flexural strength and hardness of the glass-ceramics, the microhardness is up to 585.68 MPa, the flexural strength is up to 126.21 MPa.
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