CaZrO3引入种类和氧化镁含量对合成MgO-CaZrO3质耐火材料性能的影响
Influence of CaZrO3 introduction types and magnesium oxide content on properties of synthesized MgO-CaZrO3 refractory materials
孔一博 1隋昕源 1王志鹏 1王立广 1于景坤 1袁磊 1温天朋1
作者信息
- 1. 东北大学冶金学院,辽宁沈阳 110819
- 折叠
摘要
为制备高性能的MgO-CaZrO3耐火材料,利用预合成CaZrO3作为原料,在制备过程中分别加入不同含量的MgO,通过X射线衍射、物理性能分析和扫描电镜等技术,研究CaZrO3引入种类和MgO含量对其物相组成、显微组织和物理性能的影响.结果表明,MgO在一定程度上促进了CaZrO3向钙锆中间产物Ca0.15Zr0.85O1.85的转化,在高温烧结过程中,会新生成一定量的CaZrO3,界面反应增多,促进了烧结致密化.引入CaZrO3预处理原料时,当MgO加入量为30％(质量分数),材料性能较好,主要物相为MgO、CaZrO3和Ca0.15Zr0.85O1.85,CaZrO3平均晶粒尺寸为1.5～2.5μm,MgO平均晶粒尺寸为2.5～3.5μm;显气孔率为2.56％,体积密度为3.85g/cm3,线收缩率为15.43％,常温耐压强度为376 MPa.引入CaZrO3原料时,当MgO加入量为30％(质量分数),材料性能较好,主要物相为MgO、CaZrO3和Ca0.15Zr0.85O1.85,CaZrO3平均晶粒尺寸为2～4μm,MgO平均晶粒尺寸为9～11μm;显气孔率为0.90％,体积密度为4.87 g/cm3,线收缩率为17.47％,常温耐压强度为250 MPa.
Abstract
To prepare high-performance MgO-CaZrO3 refractory materials,pre-synthesized calcium zirconate was used as the raw material,and different contents of magnesium oxide were added during the process.The effects of CaZrO3 introduction types and magnesium oxide content on the phase composition,microstructure and physical properties were studied through techniques such as X-ray diffraction,physical property analysis,and scanning electron microscopy.The results show that the presence of MgO promotes the transformation of calcium zirconate to the intermediate product Ca0.15Zr0.85O1.85 to a certain extent.During the high-temperature sintering process,newly generated CaZrO3 could lead to the increase in interfacial reactions and the sintering densification would be greatly improved.When the pre-synthesized CaZrO3 was introduced as well as 30 mass％ of MgO was added,the obtained MgO-CaZrO3 refractories possessed excellent properties.For the obtained MgO-CaZrO3 refractories,the main phases were MgO,CaZrO3,and Ca0.15Zr0.85O1.85,where the average grain size of CaZrO3 was 1.5-2.5μm and that of MgO was 2.5-3.5 μm.According to the analysis of densification parameters,the apparent porosity was 2.56％,the bulk density was 3.85 g/cm3,the linear shrinkage rate was 15.43％,and the compressive strength at room temperature was 376 MPa.Correspondingly,the MgO-CaZrO3 refractories were obtained with excellent properties when the synthesized CaZrO3 was introduced as well as 30 mass％ of MgO was added.The main phases for the prepared MgO-CaZrO3 refractories were also MgO,CaZrO3,and Ca0.15Zr0.85O1.85.The average grain size of CaZrO3 and MgO increased to 2-4μm and 9-11 μm,respectively.Meanwhile,the densification also increased,where the apparent porosity was 0.90％,the bulk density was 4.87 g/cm3 and the linear shrinkage rate was 17.47％.The room-temperature compressive strength exhibited a decrease tendency with a value of 250 MPa at this time.
关键词
CaZrO3/氧化镁/MgO-CaZrO3耐火材料/物理性能/显微结构Key words
calcium zirconate/magnesium oxide/MgO-CaZrO3 refractory material/physical performance/micro-structure引用本文复制引用
基金项目
2023年联合基金项目面上资助计划资助项目(2023-MSBA-048)
中央高校基本科研业务费资助项目(N2425027)
出版年
2024
NETL
NSTL
万方数据