中钛型含钛高炉渣制微晶玻璃及其性能研究

以中钛型含钛高炉渣为主原料制备微晶玻璃,利用渣中的TiO2作晶核剂.采用差示扫描量热法(DSC)、X射线衍射(XRD)和扫描电子显微镜(SEM)等分析技术研究了含钛高炉渣用量的变化对基础玻璃晶化、微晶玻璃性能的影响.结果表明,渣中适量的TiO2对玻璃晶化有较好的促进作用.渣用量较低时制得的微晶玻璃的主晶相为硅灰石,但当渣用量超过70％时,主晶相发生变化,变为钙铝黄长石等长石类矿相.中钛型含钛高炉渣用量为63％左右时,制得的微晶玻璃晶相含量合适,性能最好.此时采用的热处理制度为:核化温度720℃,保温1h,晶化温度945℃,保温2h,制得的微晶玻璃抗弯强度为121.68MPa,显微硬度为7.81 GPa.

Preparation and Characterization of Glass-ceramics Based on Medium Titanium-bearing Blast Furnace Slag

Medium titanium-bearing blast furnace slag was used as the main material to manufacture glass-ceramic.TiO2 in this type of blast furnace slag serves as an effective constitute in terms of promoting the nucleation process.The effects of the mass fraction of blast furnace slag in the parent glass on the crystallization and properties of final products were studied by scanning calorimetry (DSC),X-ray diffraction (XRD),scanning electron microscopy (SEM) and etc.It is found that a medium-level of TiO2 in blast furnace slag could effectively initiate the crystallization within the parent glass.Low mass fraction of blast furnace slag would result in wollastonite as the major crystalline phases.In contrast,when the mass fraction of blast furnace slag exceeded 70％,the major phase would turn into gehlenite.Furthermore,when the mass fraction of blast furnace slag was 63％,the final glass-ceramic product with a desired crystallinity was characterized by excellent performance.The corresponding heat treatment systerm included a nucleating stage at 720 ℃ for 1 h and a crystal growth stage at 945 ℃ {or 2 h.The resulting product possessed a bending strength of 121.68 MPa and a microhardness of 7.81 GPa.