Cr_2O_3对含铁辉石微晶玻璃显微结构及强度的影响  

Effect of Cr_2O_3 on Microstructure and Strength of Iron-Rich Pyroxene Glass Ceramic

作　　者：陈华[1,2] 李保卫 赵鸣[3] 张雪峰[2] 杜永胜[2] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]内蒙古科技大学数理与生物工程学院,内蒙古包头014010 [3]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,内蒙古包头014010

出　　处：《硅酸盐学报》2015年第9期1240-1246,共7页Journal of The Chinese Ceramic Society

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

摘　　要：以富铁白云鄂博西尾矿和粉煤灰为主要原料,采用熔融法制备含铁辉石系矿渣微晶玻璃。利用差热分析、X射线衍射仪、扫描电子显微镜和能谱仪等研究Cr2O3对含铁辉石系微晶玻璃显微结构和强度的影响。结果表明:Mg Fe0.9Cr1.1O4尖晶石作为辉石相生长的异质成核核心,促使辉石晶体优先从尖晶石表面法线方向以枝晶方式生长。随着Cr2O3含量增加,尖晶石核心数量增多,辉石相生长方式由树枝状演化为颗粒状。添加0.25%的Cr2O3可使微晶玻璃辉石主晶相形成交错咬合的树枝晶,有效提高了微晶玻璃抗折强度,并达到218.84 MPa。The pyroxene-based slag glass ceramics were fabricated with the iron-rich tailing from Bayan Obo west mine and fly ash by a conventional melting method. The effect of Cr203 on the microstructure and strength of this pyroxene-based glass ceramics was investigated by differential thermal analysis, X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry, respectively. The results show that MgFeo.9Cr1.104 spinel is the heterogeneous nucleus of augite main crystal phase. Augite dendrite grows preferentially along the normal direction of the spinel surface. The MgFeo.gCrl.lO4 spinel nuclei increase with the increase of Cr203, leading to the formation of augite particles. The sample with interlocked angite dendrite formed at 0.25% Cr203 shows the optimum mechanic property, and the bending strength of the glass ceramic can reach 218.84 MPa.

关 键 词：微晶玻璃 三氧化二铬 尖晶石 辉石 显微结构 

分 类 号：TQ171[化学工程—玻璃工业]