石墨粉对矿渣微晶玻璃结构和性能的影响

doi:10.11901/1005.3093.2014.590

材料研究学报

2015, Vol. 29

Issue (10): 767-772 DOI: 10.11901/1005.3093.2014.590

本期目录 | 过刊浏览

石墨粉对矿渣微晶玻璃结构和性能的影响

李保卫¹,范秀娟^1,²(

),杜永胜^1,³,赵鸣¹

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

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

Baowei LI¹,Xiujuan FAN^1,^2,^**(

),Yongsheng DU^1,³,Ming ZHAO¹

1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
2. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
3. School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

引用本文:

李保卫,范秀娟,杜永胜,赵鸣. 石墨粉对矿渣微晶玻璃结构和性能的影响[J]. 材料研究学报, 2015, 29(10): 767-772.
Baowei LI, Xiujuan FAN, Yongsheng DU, Ming ZHAO. Effect of Graphite Powder Addition on Structure and Properties of Slag Glass-Ceramic[J]. Chinese Journal of Materials Research, 2015, 29(10): 767-772.

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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。

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

Abstract：

Slag glass-ceramics of CaO-Al₂O₃-MgO-SiO₂(CAMS) with addition of 0-13% (mass fraction) 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 dilatometer. The effect of graphite addition on the structure and properties of the glass-ceramics was systematically 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 thermal expansion coefficient of the glass ceramic is increased at least by 15%. However, with the further addition 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 suppressed. 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.

Key words： inorganic non-metallic materials glass-ceramic graphite powder Bayun-Obo east mine tailing thermal expansion coefficient

收稿日期: 2014-10-16

基金资助:* 国家重点基础研究发展计划2012CB722802和内蒙古自然基金面上项目2014MS0106资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.590 或 https://www.cjmr.org/CN/Y2015/V29/I10/767

图1 添加不同含量石墨粉的微晶玻璃样品的DTA图

图2 添加不同含量石墨粉的微晶玻璃样品XRD谱

图3 添加不同含量石墨粉的微晶玻璃SEM像及1#、2#样品的TEM像

表1 升温速率不同的1#和2#的放热峰温度和析晶活化能

表2 添加不同含量石墨粉的微晶玻璃的性能

图4 添加不同含量石墨粉的微晶玻璃的CTE图

表3 添加不同含量石墨粉的微晶玻璃的热膨胀系数α和失配度β

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