Y_(2)O_(3)/ZrO_(2)对MgO-CaO耐火材料性能的影响  

Effect of Y_(2)O_(3)/ZrO_(2)on Properties of MgO-CaO Refractory

作　　者：靳虎林 马妍[1] 王周福[1] 邓承继[1] 王玺堂[1] 刘浩[1] 董云洁 童光大 付卫东 JIN Hulin;MA Yan;WANG Zhoufu;DENG Chengji;WANG Xitang;LIU Hao;DONG Yunjie;TONG Guangda;FU Weidong(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Xiangyang Juli High Technology Material Co.,Ltd.,Xiangyang 441705,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]襄阳聚力新材料科技有限公司,襄阳441705

出　　处：《硅酸盐通报》2025年第1期343-352,387,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金区域联合基金项目(U20A20239,U21A2057);2023年度湖北省技术创新计划重点研发专项(2023BEB017);2023年隆中人才支持计划(23)。

摘　　要：镁钙质耐火材料具有良好的耐高温性能和净化钢液能力,作为洁净钢、特殊钢冶炼用炉衬材料应用前景广阔。然而,该类材料难烧结、易水化和力学性能有待提升等问题亟待解决。本文制备了Y_(2)O_(3)/ZrO_(2)共掺杂MgO-CaO耐火材料,并与Y_(2)O_(3)、ZrO_(2)单掺杂材料进行了对比分析,研究了Y_(2)O_(3)/ZrO_(2)的引入对材料显微结构和性能的影响。结果表明,Y_(2)O_(3)单掺杂MgO-CaO耐火材料后,一部分固溶进入氧化钙晶格,而另一部分赋存于晶间,阻碍了材料烧结。协同引入少量ZrO_(2)后,材料的致密度提高,且常温抗折强度和抗水化性能明显改善。原位生成的CaZrO_(3)填充在材料孔隙中,提高了材料的烧结性能。然而,当引入过量的ZrO_(2)时,CaZrO_(3)生成量较多,产生明显体积膨胀导致材料显气孔率上升,力学性能和抗水化性能下降。MgO-CaO refractories have a broad application prospect as furnace lining materials for clean steel and special steel smelting due to their good high temperature resistance and ability to purify steel.However,these materials still have problems such as difficult sintering,easy hydration and mechanical properties need to be improved.In this work,Y_(2)O_(3)/ZrO_(2)co-doped MgO-CaO refractories were prepared by comparing with Y_(2)O_(3)and ZrO_(2)single-doped MgO-CaO refractories.The effect of Y_(2)O_(3)/ZrO_(2)introduction on the microstructure and properties of materials was investigated.The results show that some Y_(2)O_(3)dissolves into the CaO lattice,while other Y_(2)O_(3)locates at the intergranular region in the Y_(2)O_(3)single-doped MgO-CaO materials.The intergranular Y_(2)O_(3)hinders the sintering of the material.When a small amount of ZrO_(2)is synergistically introduced,the density of the material increases,and the room temperature flexural strength and hydration resistance are improved.This is due to the in-situ generated CaZrO_(3)filling in the voids,which is favourable to the sintering properties of the materials.However,when excessive ZrO_(2)is introduced,more CaZrO_(3)generates in the materials,and the significant volume expansion leads to the increase of apparent porosity,leading to a decrease in the mechanical properties and hydration resistance of the materials.

关 键 词：镁钙质耐火材料 氧化钇 掺杂 显微结构 抗水化性能 

分 类 号：TQ175.1[化学工程—硅酸盐工业]