铁尾矿制备碳化硅多孔陶瓷材料及其性能研究  

Preparation and properties of porous silicon carbide ceramic materials from iron tailings

作　　者：关昀鹤 郑丽君 罗旭东 牛舒楠 Guan Yunhe;Zheng Lijun;Luo Xudong;Niu Shunan(不详;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《耐火材料》2024年第3期246-250,共5页Refractories

摘　　要：为了探究铁尾矿的再利用,以铁尾矿和无烟煤为原料,经碳热还原反应制备了碳化硅多孔陶瓷试样,研究了C与SiO_(2)物质的量比(C和SiO_(2)物质的量比分别为3∶1、4∶1、5∶1和6∶1)及热处理温度(1200、1300、1400和1500℃)对碳化硅多孔陶瓷试样显微结构、力学性能和热导率的影响。结果表明:碳化硅多孔陶瓷主晶相为β-SiC,次晶相为Fe_(5)Si_(3)和Fe_(3)Si。随着热处理温度升高,C与SiO_(2)物质的量比增加,碳热还原反应越充分,β-SiC相含量逐渐增加,试样的体积密度和常温耐压强度降低,显气孔率增加,热导率降低。当热处理温度为1500℃,C与SiO_(2)物质的量比为6∶1时,试样的体积密度为1.25 g·cm^(-3),显气孔率为62.3%,常温耐压强度为35.0 MPa,800℃时热导率为0.150 W·m^(-1)·K^(-1),综合性能最佳。To explore the reuse of iron tailings,the porous silicon carbide ceramic materials were prepared by carbothermal reduction with iron tailings and anthracite as raw materials.The effects of the molar ratio of C to SiO_(2)(3∶1,4∶1,5∶1 and 6∶1)and the heat treatment temperature(1200,1300,1400 and 1500℃)on the microstructure,mechanical properties,and thermal conductivity of the porous silicon carbide ceramic materials were studied.The results show that the main crystalline phase of the porous silicon carbide ceramic materials isβ-SiC,and the secondary crystalline phases are Fe_(5)Si_(3)and Fe_(3)Si;with the increasing heat treatment temperature and the molar ratio of C to SiO_(2),the carbothermal reduction reaction tends to be complete,theβ-SiC content increases gradually,the bulk density and cold compressive strength decrease,the apparent porosity increases and the thermal conductivity decreases.When the heat treatment temperature is 1500℃and the molar ratio of C to SiO_(2)is 6∶1,the optimal properties can be achieved:the bulk density of 1.25 g·cm^(-3),the apparent porosity of 62.3%,the cold compressive strength of 35.0 MPa,and the thermal conductivity of 0.150 W·m^(-1)·K^(-1)at 800℃.

关 键 词：铁尾矿 无烟煤 碳化硅陶瓷 碳热还原 热导率 

分 类 号：TQ175[化学工程—硅酸盐工业]