镁砂细粉对尖晶石轻质耐火材料结构与性能的影响

耐火与石灰 ›› 2023, Vol. 48 ›› Issue (2): 1-5.

• 综述 • 下一篇

镁砂细粉对尖晶石轻质耐火材料结构与性能的影响

（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）

出版日期:2023-04-10 发布日期:2023-04-06

Influences of magnesia powder on the structure and properties of light-weight spinel refractories

（The State Key Laboratory of Refractories and Metallurgy，Wuhan University of Science and Technology，Wuhan 430081，China）

Online:2023-04-10 Published:2023-04-06

摘要/Abstract

摘要： 以电熔尖晶石细粉、烧结镁砂细粉和镁铝尖晶石空心球为主要原料，采用固相烧结法制备了尖晶石轻质耐火材料。借助 XRD、SEM 等测试手段研究了镁砂细粉和空心球对材料物相组成、显微结构、耐压强度、导热系数等方面的影响。结果表明：少量镁砂细粉（小于 5%）的引入，部分固溶于尖晶石中，部分在空心球与尖晶石粉末颗粒之间产生二次尖晶石，促进了空心球与周围粉末颗粒间的结合，减小了材料的孔隙尺寸，降低了导热系数；增加镁砂细粉引入量，有利于促进烧结、提高材料的致密性与耐压强度；控制镁砂细粉引入量小于 5%，可制备得到体积密度为 1.85 ～ 1.98 g/cm3 、耐压强度为 22.8 ～ 27.3 MPa、导热系数为 0.256 ～ 0.524 W/(m•K)（200 ～ 1 000℃）的尖晶石轻质耐火材料。

关键词: 轻质耐火材料, 空心球, 镁砂细粉, 镁铝尖晶石

Abstract: Light-weight spinel refractories were prepared by solid phase sintering method with fused spinel fine powder，sintered magnesia powder and hollow magnesia alumina spinel balls as main raw materials. The effects of magnesia powder and hollow magnesia spinel balls on phase composition，microstructure，compressive strength and thermal conductivity of refractories were studied. The results showed that the introduction of magnesia powder（less than 5%）promoted the cambination of hollow balls and surrounding particals due to the solid dissolve in spinel and the formation of secondary spinel between hollow ball and spinel powder particles. Increasing the content of magnesia powder promoted the sintering，compactness and compressive strength of refractories. Addition of magnesia powder below 5% was conductive to obtain light-weight spinel refractories with the enhanced compressive strength (22.8 ～ 27.3 MPa)，the decreased size of pores and thermal conductivity [200 ～ 1 000 ℃，0.256 ～ 0.524 W/(m•K)].

Key words: Light-weight refractories, Hollow sphere, Magnesia powder, Magnesia alumina spinel

中图分类号:

TQ175.713.3

刘　浩　许向阳　王周福　王玺堂　马　妍. 镁砂细粉对尖晶石轻质耐火材料结构与性能的影响[J]. 耐火与石灰, 2023, 48(2): 1-5.

Liu Hao　Xu Xiangyang　Wang Zhoufu　Wang Xitang　Ma Yan. Influences of magnesia powder on the structure and properties of light-weight spinel refractories[J]. REFRACTORIES & LIME, 2023, 48(2): 1-5.

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镁砂细粉对尖晶石轻质耐火材料结构与性能的影响

Influences of magnesia powder on the structure and properties of light-weight spinel refractories

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