石墨粉对矿渣微晶玻璃结构和性能的影响  

Effect of Graphite Powder Addition on Structure and Properties of Slag Glass-Ceramic

作　　者：李保卫 范秀娟[1,2] 杜永胜[1,3] 赵鸣[1] 

机构地区：[1]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,包头014010 [2]内蒙古科技大学材料与冶金学院,包头014010 [3]内蒙古科技大学数理与生物工程学院,包头014010

出　　处：《材料研究学报》2015年第10期767-772,共6页Chinese Journal of Materials Research

基　　金：国家重点基础研究发展计划2012CB722802;内蒙古自然基金面上项目2014MS0106资助项目~~

摘　　要：用熔铸法、以白云鄂博东尾矿及粉煤灰为主要原料制备了添加质量分数为0-13%石墨粉的CaO-Al2O3-MgO-SiO2(CAMS)系矿渣微晶玻璃,用DTA、XRD、FE-SEM、TEM和热膨胀仪等手段对其表征,研究了石墨粉添加量对CAMS基矿渣微晶玻璃结构和性能的影响。结果表明,5%石墨粉被氧化提高Fe2+含量促进了辉石相的晶化,样品在100-600℃的热膨胀系数可提高15%以上;随着Fe被更多的石墨粉还原出来,辉石相形核基础-磁铁矿相晶核减少抑制了辉石相的生成。辉石球形晶粒由尺寸更小的柱状晶和少量残留玻璃相组成。Slag glass-ceramics of CaO-Al2O3-MgO-SiO2 （CAMS） with addition of 0-13% （mass frac- tion） graphite powder was prepared with tailings of East Bayun-Obo and fly ash as raw materials by the traditional melting-casting method and characterized by DTA, XRD, FE-SEM, TEM and thermal dilatome- ter. The effect of graphite addition on the structure and properties of the glass-ceramics was systematical- ly investigated. The results show that the crystallization of augite phase was promoted by the increase of Fe2~ cations due to the reduction induced by the addition of only 5% graphite powder. As a result, the ther- mal expansion coefficient of the： glass ceramic is increased at least by 15%. However, with the further ad- dition of graphite powder the higher amount of iron was reduced, thereby the amount of magnetite phase decreased, which was the crystal nuclei for augite and in turn, the crystallization of augite might be sup- pressed. In addition, TEM observation results shows that the spherical augite crystals on the etched glass ceramics of CAMS observed by SEM is a mixer of many much smaller columnar augite crystals and a little fraction of residual glass.

关 键 词：无机非金属材料 微晶玻璃 石墨粉 白云鄂博东尾矿 热膨胀系数 

分 类 号：TB321[一般工业技术—材料科学与工程] TQ171[化学工程—玻璃工业]