Microstructure evolution and thermal shock resistance of MgO-C refractories with Si powder-modified magnesia aggregates

被引：1
|
作者：
Ding, Kequan [1 ,2 ]
Xu, Yibiao [1 ,2 ]
Xu, Xiaofeng [1 ,2 ]
Li, Yawei [1 ,2 ]
Yan, Wen [1 ,2 ]
Wang, Qinghu [1 ,2 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
[2] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Linin, Wuhan 430081, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2025年 / 51卷 / 06期
关键词：
MgO-C refractories; Modified magnesia aggregates; Si powder; Mg 2 SiO 4-SiC ceramic coating; Thermal shock resistance; MECHANICAL-PROPERTIES; PHYSICAL-PROPERTIES; NANO; TEMPERATURE; GRAPHITE; BEHAVIOR; PERFORMANCE; IMPROVEMENT; MORPHOLOGY; CERAMICS;
D O I：
10.1016/j.ceramint.2024.12.196
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Modified magnesia aggregates coated with Si powder were prepared and their effects on the phase composition, microstructure and thermal shock resistance of the MgO-C refractories were investigated. The Si powder coating can bond tightly with the prepared modified magnesia aggregates, fulfilling the requirements for mixing and molding of the MgO-C refractories. At high temperatures, the Si powder coating around the magnesia aggregates transformed into Mg2SiO4-SiC ceramic coating layer, causing microcracks formation between the ceramic coating and aggregates due to their thermal mismatch. Within the microcracks, SiC and Mg2SiO4 whiskers were generated by chemical vapor deposition and vapor-liquid-solid mechanism, respectively. The Mg2SiO4-SiC ceramic coating and microcracks could accommodate thermal expansion and relieve the thermal stress on the aggregates, and the Mg2SiO4 and SiC whiskers within microcracks can create a toughening effect, effectively improving the thermal shock resistance of MgO-C refractories.
引用
收藏
页码：7584 / 7592
页数：9
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