硅酸盐学报

Cr2O3对含铁辉石微晶玻璃显微结构及强度的影响

单位：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 内蒙古 3. 内蒙古科技大学数理与生物工程学院包头 014010 内蒙古

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

出版年,卷(期):页码：2015,43(9):0-0

DOI：

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：MgFe_.9Cr_1.1O₄尖晶石作为辉石相生长的异质形核核心，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218.84MPa。

The pyroxene-based slag glass ceramics were fabricated with the iron-rich tailing from Bayan Obo western mine and fly ash by a conventional melting method. The effect of Cr₂O₃ 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 MgFe_.9Cr_1.1O₄ spinel is the heterogeneous nucleus of augite main crystal phase. Augite dendrite grows preferentially along the normal direction of the spinel surface., The MgFe_.9Cr_1.1O₄ spinel nuclei increase with the increase of Cr₂O₃, leading to the formation of Augite particles. The sample with interlocked augite dendrite formed at 0.25% Cr₂O₃shows the optimum mechanic property, and the bending strength of the glass ceramic can reach 218.84MPa.

基金项目：

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。

作者简介：

第一作者：陈华(1979—)，女，博士研究生。通信作者：李保卫(1960—)，男，博士，教授。

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