稀土氧化物种类和热处理温度对合成镁锆砂性能的影响  

Effect of rare earth oxides and heat treatment temperature on properties of synthetic magnesia-zirconia materials

作　　者：冯雨 高永军 吴锋 李心慰 王林 罗旭东 徐若梦 Feng Yu;Gao Yongjun;Wu Feng;Li Xinwei;Wang Lin;Luo Xudong;Xu Ruomeng(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;不详)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]阳煤纳谷(山西)节能服务有限责任公司,山西阳泉045000 [3]奥镁(大连)有限公司,辽宁大连116600 [4]沈阳开放大学,辽宁沈阳110003

出　　处：《耐火材料》2023年第4期324-328,共5页Refractories

基　　金：国家自然科学基金资助项目(U1908227)。

摘　　要：为充分利用辽南地区的低品位菱镁矿,制备优质镁质合成耐火原料,以岫岩二级菱镁矿和脱硅锆为主要原料,分别加入2%(w)的CeO_(2)、Y_(2)O_(3)、La_(2)O_(3)稀土氧化物,于1500、1600、1700℃热处理3 h后得到镁锆砂试样,研究了稀土氧化物种类与热处理温度对镁锆砂性能及显微结构的影响。结果表明:1)与未添加稀土氧化物的试样相比,添加了稀土氧化物试样的抗热震性提高,体积密度增大,显气孔率减小;2)加入2%(w)CeO_(2)的镁锆砂试样经1700℃热处理3 h后,其体积密度最大,显气孔率最小,抗热震性最好。To make full use of the low-grade magnesite in southern Liaoning Province and prepare high-quality synthetic magnesia,magnesia-zirconia samples were prepared using Xiuyan secondary magnesite and desilicated zirconia as the main raw materials,adding 2 mass%rare earth oxides(CeO_(2),Y_(2)O_(3)and La_(2)O_(3),respectively)as the additive,heating at 1500,1600 and 1700℃for 3 h.Effects of rare earth oxide types and heat treatment temperatures on the properties and the microstructure of the samples were studied.The results show that:(1)compared with the samples without rare earth oxides,the samples with rare earth oxides have better thermal shock resistance,higher bulk density and lower apparent porosity;(2)after heat treatment at 1700℃for 3 h,the magnesia-zirconia sample with 2%CeO_(2)has the highest bulk density,the lowest apparent porosity and the best thermal shock resistance.

关 键 词：菱镁矿 镁锆砂 稀土氧化物 抗热震性 

分 类 号：TQ175[化学工程—硅酸盐工业]