摘要
本文以锂尾矿为主要原材料,SiC作为高温发泡剂制备微晶发泡陶瓷,研究了Fe_(2)O_(3)作为氧化助剂对发泡陶瓷烧成性能、孔结构及物理性能的影响,并利用高温显微镜、XRD、SEM等微观表征手段,揭示了Fe_(2)O_(3)对微晶发泡陶瓷性能的影响机理。结果表明,Fe_(2)O_(3)的掺入不仅显著改变了微晶发泡陶瓷的颜色,还影响了试样的高温发泡能力、孔结构及物理性能。在高温发泡阶段Fe_(2)O_(3)提供了SiC氧化分解所需的O^(2-),有效提升了坯体的高温发泡能力。当Fe_(2)O_(3)添加量为4%(质量分数)时,在1 180℃下可制备出平均孔径仅为0.95 mm、体积密度为0.29 g/cm^(3)、抗压强度为3.19 MPa的锂尾矿基微晶发泡陶瓷试样。同时,Fe_(2)O_(3)促使主晶相由堇青石转变为尺寸微小的尖晶石,促使孔径尺寸逐渐减小。然而,当Fe_(2)O_(3)掺量超过4%导致坯体的烧结温度升高,发泡能力降低。
In this study,formed glass-ceramics using lithium tailings as primary raw material and silicon carbide(SiC)as the high-temperature foaming agent were prepared.The influence of iron oxide(Fe_(2)O_(3))as an oxidation aid on the sintering behavior,pore structure,and physical properties of the foamed glass-ceramics was systematically examined.High-temperature microscopy,XRD,SEM and other microscopic characterization methods were employed to elucidate the underlying mechanisms by which Fe_(2)O_(3) modifies the properties of the formed glass-ceramics.The results demonstrate that the incorporation of Fe_(2)O_(3) significantly alters the color of the foamed glass-ceramics and influences their high-temperature foaming capability,pore structure,and physical properties.Fe_(2)O_(3) facilitates the oxidation decomposition of SiC during the high-temperature foaming stage by supplying active oxygen(O^(2-)),thereby improving the high-temperature foaming ability of green body.At an optimal Fe_(2)O_(3) content of 4%(mass fraction),a well-structured lithium tailings formed glass-ceramics is synthesized at 1180℃,which exhibits an average pore size of 0.95 mm,a bulk density of 0.29 g/cm^(3),and a compressive strength of 3.19 MPa.Furthermore,increasing the Fe_(2)O_(3) content promotes the transformation of the primary crystalline phase from azurite to fine-grained spinel,accompanied by a reduction in pore size.However,excessive Fe_(2)O_(3) content(>4%)leads to an elevated sintering temperature and diminishes foaming ability.
作者
喻劲军
葛雪祥
唐广龙
吉永发
金玉
钟展发
葛涛
戴永刚
YU Jinjun;GE Xuexiang;TANG Guanglong;JI Yongfa;JIN Yu;ZHONG Zhanfa;GE Tao;DAI Yonggang(Guangdong KITO Ceramics Group Co.,Ltd.,Foshan 528000,China;School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)
出处
《硅酸盐通报》
北大核心
2025年第12期4536-4545,共10页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(青年)项目(52102014)。
