轻质氧化镁含量对方镁石-镁铝尖晶石砖性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (3): 1122-1129.

所属专题：耐火材料

轻质氧化镁含量对方镁石-镁铝尖晶石砖性能的影响

刘德嵩^1,2, 杨忠德^1,2, 林鑫^1,2, 谢虎^1,2, 张菡欣³, 王开³, 黄守武³, 刘振英³

1.安徽海螺暹罗耐火材料有限公司,芜湖 241070;
2.安徽海螺集团有限责任公司,芜湖 241000;
3.安徽理工大学材料科学与工程学院,淮南 232001

收稿日期:2022-10-30 修订日期:2022-12-29 出版日期:2023-03-15 发布日期:2023-03-31
通信作者: 刘振英,副教授。E-mail:zyliu@aust.edu.cn
作者简介:刘德嵩(1979—),男,工程师。主要从事水泥窑用耐火材料、水泥工艺及窑炉砌筑的研究。E-mail:liudesongcj@163.com
基金资助:
国家自然科学基金(11872001);校企科技攻关项目(HX2021062279)

Effect of Lightweight Magnesia Content on Properties of Periclase-Magnesium-Aluminate Spinel Bricks

LIU Desong^1,2, YANG Zhongde^1,2, LIN Xin^1,2, XIE Hu^1,2, ZHANG Hanxin³, WANG Kai³, HUANG Shouwu³, LIU Zhenying³

1. Anhui Conch-SCG Refractory Co., Ltd., Wuhu 241070, China;
2. Anhui Conch Group Co., Ltd., Wuhu 241000, China;
3. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China

Received:2022-10-30 Revised:2022-12-29 Online:2023-03-15 Published:2023-03-31

摘要/Abstract

摘要： 以不同粒径的烧结镁砂、电熔镁铝尖晶石、镁铝尖晶石空心球为起始原料,采用固相烧结法制备了方镁石-镁铝尖晶石砖。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征试样的物相组成和微观结构,利用阿基米德排水法测试试样的体积密度和显气孔率,研究轻质氧化镁含量和烧结温度对方镁石-镁铝尖晶石砖性能的影响。结果表明,随轻质氧化镁含量的增加,方镁石-镁铝尖晶石砖显气孔率呈增加趋势,而体积密度变化不明显,试样表现出优异的力学性能。当轻质氧化镁含量为25%(质量分数)时,方镁石-镁铝尖晶石砖的抗折强度最大为9.56 MPa,热导率最低为1.92 W·m^-1·K^-1。显微结构表明骨料和基质结合良好,并能形成微孔状通道。利用其特殊的微孔结构,提高了试样的力学性能和耐腐蚀性,进一步保护方镁石-镁铝尖晶石砖免受碱侵蚀。

关键词: 轻质氧化镁, 物理性能, 力学性能, 热导率, 显微结构, 耐碱性

Abstract: Periclase-magnesium-aluminate spinel bricks were fabricated by solid-state sintering method using sintered magnesia, fused magnesia-aluminate spinel and magnesium-aluminate spinel hollow spheres with different particle sizes as raw materials. The phase composition of samples was examined by X-ray diffractometer (XRD), the microstructure of samples was characterized by scanning electron microscopy (SEM), and the bulk density and apparent porosity of samples were measured according to the Archimedes principle method. The effects of lightweight magnesia content and sintering temperature on the properties of periclase-magnesium-aluminate spinel bricks were investigated. The results show that with the increase of lightweight magnesia content, the apparent porosity of periclase-magnesium-aluminate spinel bricks increases, and the bulk density has little change, so it has good mechanical properties. When the lightweight magnesia mass fraction is 25%, the maximum flexural strength of periclase-magnesium-aluminate spinel bricks is 9.56 MPa, and the lowest thermal conductivity is 1.92 W·m^-1·K^-1. The microstructure shows that the aggregate and matrix are well combined and formed microporous channels. Periclase-magnesium-aluminate spinel bricks have good mechanical properties and alkali corrosion resistance because of their unique microporous structure, which further protect samples from alkali corrosion.

Key words: lightweight magnesia, physical property, mechanical property, thermal conductivity, microstructure, alkali resistance

中图分类号:

TQ175.7

刘德嵩, 杨忠德, 林鑫, 谢虎, 张菡欣, 王开, 黄守武, 刘振英. 轻质氧化镁含量对方镁石-镁铝尖晶石砖性能的影响[J]. 硅酸盐通报, 2023, 42(3): 1122-1129.

LIU Desong, YANG Zhongde, LIN Xin, XIE Hu, ZHANG Hanxin, WANG Kai, HUANG Shouwu, LIU Zhenying. Effect of Lightweight Magnesia Content on Properties of Periclase-Magnesium-Aluminate Spinel Bricks[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 1122-1129.

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轻质氧化镁含量对方镁石-镁铝尖晶石砖性能的影响

Effect of Lightweight Magnesia Content on Properties of Periclase-Magnesium-Aluminate Spinel Bricks

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