MgO添加量对氧化锆质定径水口材料性能的影响  

Effect of MgO addition on properties of zirconia sizing nozzle material

作　　者：林思琦 刘兴刚 刘涛 李玉庆 于景坤 Lin Siqi;Liu Xinggang;Liu Tao;Li Yuqing;Yu Jingkun(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;不详)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819 [3]滨州市高级技工学校,山东滨州256600

出　　处：《耐火材料》2023年第3期250-252,258,共4页Refractories

基　　金：国家自然科学基金资助项目(51974072)。

摘　　要：为提高定径水口的性能,以ZrO_(2)细粉(d_(50)分别为3、5、8μm)为原料,以聚乙烯醇水溶液为结合剂,外加不同质量分数(分别为2.0%、2.5%、2.8%、3.0%、3.5%)的MgO,于1700℃保温2 h热处理后制备了氧化镁稳定氧化锆质定径水口材料,探究MgO添加量对其物相组成、显微结构及性能的影响。研究表明:随着MgO添加量的增加,试样的体积密度、常温耐压强度和热震三次后强度保持率均先增加后减小;MgO添加量为2.5%(w)时,试样综合性能最优,显气孔率为0.75%,体积密度为5.51 g·cm^(-3),常温耐压强度为980 MPa,热震3次后的常温耐压强度为1025 MPa。In order to improve the performance of sizing nozzles,MgO stabilized zirconia sizing nozzle material was prepared using ZrO_(2)fine powder(d_(50)=3,5 and 8μm)as the raw material,polyvinyl alcohol aqueous solution as the binder,extra adding different mass fractions(2.0%,2.5%,2.8%,3.0%and 3.5%)of MgO,and heat treating at 1700℃for 2 h.The effects of the MgO addition on the phase composition,microstructure and properties were studied.The bulk density,the cold compressive strength and the strength retention ratio after 3 cycles of thermal shock of the samples increase first and then decrease with the increase of the MgO addition.When the MgO addition is 2.5%,the comprehensive performance of the sample is the best with 0.75%apparent porosity,5.51 g·cm^(-3)bulk density,980 MPa cold compressive strength,and 1025 MPa cold compressive strength after three thermal shocks.

关 键 词：氧化锆 氧化镁 致密度 抗热震性 

分 类 号：TQ175[化学工程—硅酸盐工业]