Microstructure and properties of MgO-C refractory with different carbon contents
Microstructure and properties of MgO-C refractory with different carbon contents
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不同碳含量MgO-C耐火材料的显微组织与性能
DOI：
10.1016/j.ceramint.2020.09.099
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发表时间：
2021
影响因子：
5.2
通讯作者：
Sang Shaobai
中科院分区：
文献类型：
--
作者：
Cheng Yong;Zhu Tianbin;Li Yawei;Sang Shaobai
镁碳质耐火材料是炼钢炉最重要的炉衬材料。为了给生产不同碳含量的高性能镁碳质耐火材料提供参考，系统研究了鳞片石墨含量为1- 18wt%的镁碳质耐火材料的显微结构、力学强度、抗热震性和热性能。结果表明，碳含量对高温处理后MgO-C耐火材料的显微组织演变影响不大，所有试样的基体中主要形成MgAl 2 O 4颗粒、Al 4C 3晶须和板状/晶须状AlN。随着碳含量的逐渐增加，试样的断裂强度有降低的趋势，而相应的断裂位移却越来越大，这主要是由于鳞片石墨良好的滑动能力。此外，碳含量的增加降低了试样的热膨胀率，相应地增加了热导率，从而有助于增强MgO-C耐火材料的抗热震性。
Magnesia-carbon (MgO–C) refractory is considered as the most crucial lining material in steelmaking furnaces. To provide reference for producing high performance MgO–C refractory containing different carbon contents, the microstructure, mechanical strength, thermal shock resistance and thermal properties of this material with 1–18 wt% flake graphite were studied systematically in this work. The results showed that carbon content had small effect on microstructural evolution of MgO–C refractory after high temperature treatment, mainly MgAl2O4particles, Al4C3whiskers and plate-/whisker-shaped AlN formed in the matrix of all specimens. As carbon content added increased gradually, fracture strength of specimens exhibited a reduced tendency whereas the corresponding fracture displacements became higher and higher owing mainly to good sliding ability of flake graphite. Furthermore, the increase in carbon content reduced thermal expansion rate of specimens and correspondingly increased thermal conductivity, consequently contributing to enhanced resistance to thermal shock of MgO–C refractory.