摘要
利用高炉渣、尾矿和粉煤灰各自成分特点,在未添加任何晶核剂和其他化学试剂条件下,使用烧结法制得了不同Ca O/Si O2质量比的10%Al2O3(质量分数)矿渣微晶玻璃.通过差热分析、X射线衍射、扫描电子显微镜等分析手段,分析了Ca O/Si O2质量比和析晶温度对高炉渣-尾矿-粉煤灰微晶玻璃样品的晶相变化规律、析晶行为和主要力学性能的影响.随着Ca O/Si O2质量比增大,析晶活化能不断减小,Si-O四面体连接强度下降,质点移动加强,各组开始析晶温度和晶化温度逐渐减小.当玻璃样品中钙硅氧化物的质量比为0.4时,分别在886℃和982℃形核、析晶保温1 h后,可以得到抗折强度103.59 MPa、显微硬度5.3 GPa、耐酸性0.25%(质量损失率)、耐碱性小于0.1%,主晶相为透辉石的最佳力学性能的微晶玻璃样品.
Blast furnace slag, tailing and coal fly ash were used as starting materials for preparing glass-ceramics by the sintering method based on their characteristics and without adding any other nucleating and chemical agents. The effects of CaO/SiO2 mass ratio and crystallization temperature on the crystaltransition, crystallization behavior and main mechanical properties of slag glass-ceramics with 10% Al2O3were systematically investigated by differential thermal analysis, X-ray diffraction and scanning electron microscopy. When the CaO/SiO2 mass ratio increases, the crystallization activation energy decreases, the Si-O tetrahedral bonding strength de- creases, the particle movement strengthens, and the crystallization onset temperature and the crystallization temperature decrease. The glass samples with a CaO/SiO2 mass ratio of 0. 4, sintered at 886 ℃ for 1 h as a nucleation process and at 982 ℃ for 1 h as a crystalli- zation process, possess the best performance with the bending strength of 103.59 MPa, the microhardness of 5.3 GPa and the acid and alkali resistances of 0. 25 % and 〈 0. 1% （mass loss rate） respectively. Moreover, the major phase of the glass ceramics is diopside.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2015年第6期757-763,共7页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51004012
51274042)
关键词
微晶玻璃
高炉渣
尾矿
粉煤灰
力学性能
相成分
glass-ceramics
blast furnace slag
tailings
fly ash
mechanical properties
phase composition
