作者：Mengyao Yang; Yifan Yang; Yunfei Xu; Jizeng Zhao; Wei Zhao; Zhenhua Sun; Ding'ao Yang; Lin Ren; Xiantang Zhao; Hao Yan; Lei Liu; Lei Gong; Zhaohui Huang

作者单位：Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Material Sciences and Technology, China University of Geosciences (Beijing), ;Beijing Lirr High-Temperature Materials Co., Ltd., ;Luoyang Lirr Functional Materials Co., Ltd., Luoyang

刊名：Ceramics International

ISSN：0272-8842

出版年：2024-10-10

卷：50

期：21

起页：40700-40712

止页：

分类号：

语种：英文

关键词：CaB6;Al3CON;MgAl2O4 dense layer;Slag corrosion resistance;VOD furnace;Oxidation resistance

内容简介

Excellent properties are required for refractories used for secondary refining because of the harsh service conditions. The current study investigated the effect of calcium boride (CaB6) on the properties of magnesium oxide (MgO)‒based refractories. The sample with 0.4 wt% CaB6 exhibited excellent properties. It possessed the highest bulk density indicating that a suitable content of CaB6 can increase the compactness of the refractories. The in-situ formation of aluminum oxycarbonitride (Al3CON) at high temperatures in the MgO-based refractories was from the reaction of Al, Al4C3, AlN, and Al2O3 due to the addition of Al powders, which endowed them with high strength. The refractory containing 0.4 wt% CaB6 also exhibited the highest hot modulus of rupture (HMOR) of 26.6 MPa, which was around 2.5 times the strength of commercial MgO‒CaO bricks and 1.5 times that of the samples without CaB6 addition. In addition, it exhibited the best oxidation resistance revealed by the minimum thickness of the decarbonization zone, because the addition of CaB6 promoted the formation of a dense magnesium aluminate spinel (MgAl2O4, MA) layer between the oxidized and non-decarburized zone in the refractories, thereby promoting the resistance of the samples to oxidation. It also exhibited excellent thermal shock resistance, and the residual strength ratio reached 76.6 %. The corrosion depth of the sample containing 0.4 wt% CaB6 was 9.8 % that of the MgO‒CaO bricks. This work indicates a potential alternative for producing high‒performance resin‒bonded MgO-based refractories with CaB6 in secondary refining furnaces.