CeO_(2)掺杂对CMAS微晶玻璃结构和性能的影响

Effect of CeO_(2)Doping on the Structure and Properties of CMAS Glass-ceramics

固体废物资源化利用是促进社会可持续发展和环境保护的有效方式,以铁尾矿与粉煤灰为主要原料,采用常规与微波处理制备Ca O-MgO-Al_(2)O_(3)-SiO_(2)(CMAS)体系微晶玻璃,研究了不同CeO_(2)添加量对微晶玻璃的结晶动力学参数、结晶行为和性能的影响。结果表明:CeO_(2)含量的增加使玻璃的稳定性与聚合度增强,结晶温度逐渐提高,但CeO_(2)含量为4%时,常规处理样品出现了CeO_(2)析晶。通过拉曼光谱分析发现,微波处理使玻璃中[CeO_(4)]含量增加,促使[CeO_(4)]与金属阳离子耦合,抑制离子扩散。力学性能测试表明,当CeO_(2)的掺杂量为2%时,微晶玻璃强度与韧性均提高。然而,随CeO_(2)含量的增加微晶玻璃的力学性能降低。

Resource utilization of solid waste is an effective way to promote sustainable social development and environmental protection,the CaO-MgO-Al2O3-SiO_(2)(CMAS)system glass-ceramics was prepared by conventional and microwave treatment using iron tailing and fly ash as the main raw materials.The effects of different CeO_(2)contents on the crystallization kinetic parameters,crystallization behavior and properties of glass-ceramics were investigated.The results showed that the improvement of CeO_(2)content led to the enhancement of the stability and polymerization of the glass and the gradual improvement of the crystallization temperature.However,CeO_(2)-independent crystallization appeared in the conventionally treated samples with 4%CeO_(2)content.Raman spectroscopy analysis revealed that the microwave treatment increased the[CeO_(4)]content in the glass,which prompted the coupling of[CeO_(4)]with metal cations and inhibited ion diffusion.The mechanical property tests revealed that the strength and toughness of glass-ceramics were enhanced when the doping amount of CeO_(2)was 2%.However,the mechanical properties of the glass-ceramics decreased as the CeO_(2)content increased.