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CeO2含量对白云鄂博西尾矿为原料制备的微晶玻璃力学性能的影响
作者:陈华1 3 李保卫1 2 赵鸣2 张雪峰3 杜永胜3 
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 内蒙古 包头 014010  3. 内蒙古科技大学数理与生物工程学院 内蒙古 包头 014010 
关键词:微晶玻璃 白云鄂博西尾矿 氧化铈 辉石 
分类号:TQ 171
出版年,卷(期):页码:2015,43(7):1002-1007
DOI:10.14062/j.issn.0454-5648.2015.07.25
摘要:

 以白云鄂博西尾矿和粉煤灰为主要原料采用熔铸法制备了高性能的CaO−MgO−Al2O3−SiO2 (CAMS)系微晶玻璃。研究了不同晶化温度下CeO2含量对CAMS系微晶玻璃析晶行为、显微结构和力学性能的影响。结果表明:Ce4+离子可以置换辉石相主晶相中Ca2+离子形成置换固溶体;质量分数为0.6%的CeO2可以降低微晶玻璃的晶化温度、提高辉石相结晶度、促进其形成交错咬合的枝晶结构,从而提高微晶玻璃样品的抗折强度和显微硬度;过量的CeO2富集于辉石相晶间并进而形成Ca2Ce8(SiO4)6O2第二相晶间相,阻碍辉石相的形成和长大,从而使样品的力学性能有所降低。添加0.6% CeO2的微晶玻璃样品经870 ℃晶化2 h后,抗折强度和显微硬度分别达到234 MPa和6 982 MPa。

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 The CaO−MgO−Al2O3−SiO2 (CAMS) glass ceramics were fabricated with a fly ash and a tailing from Bayan Obo West Mine, China, by a conventional melting method. The effects of CeO2 content and crystallization temperature on the optimization of crystallization, microstructure, bending strength and the Vickers hardness of the CAMS glass ceramics were investigated. The results show that Ce4+ ions can partially substitute Ca2+ ions in augite, and the primary crystalline phase can be formed in the samples. The addition of 0.6% (in mass fraction) CeO2 content to the glass ceramic decreases the crystallization temperature of augite and increases its crystallinity. The dendrite structure of augite crystals becomes more interlocked. This morphology change is mainly due to the increases of the bending strength and the Vickers hardness of the sample. When CeO2 content further increases, the segregation Ce4+ ions and the later formation of Ca2Ce8(SiO4)6O2 second phase in the residual glass between augite dendrites can hinder the growth of augite. The glass ceramic sample with 0.6% CeO2 content that is crystallized at 870 ℃ for 2 h has the optimum mechanical properties(i.e., the bending strength and the Vickers hardness are 234 MPa and 6 982 MPa, respectively).

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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)。
作者简介:
陈 华(1979—),女,博士研究生。
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