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+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 GPa。
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 GPa, respectively）.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第7期1002-1007,共6页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究发展计划项目(2012CB722802)
内蒙古自然基金面上项目(2014MS0106)
关键词
微晶玻璃
白云鄂博西尾矿
氧化铈
辉石
glass ceramics
Bayan Obo West Mine tailing
cerium oxide
augite
