Article
Chemistry, Physical
Zhe Chen, Wen Yan, Stefan Schaffoner, Yawei Li, Nan Li
Summary: The study found that lightweight Al2O3-C refractories using microcrystalline graphite had more SiC whiskers in the microporous corundum aggregates, leading to improved crack resistance and increased cold modulus of rupture. Compared to the pricier flake graphite, they had similar apparent porosity and bulk density, but higher fracture energy and toughness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Yang Chen, Chengji Deng, Xing Wang, Chao Yu, Jun Ding, Hongxi Zhu
Summary: Nanoscale c-ZrN powders were synthesized by molten-salt nitridation at 1100 degrees C and introduced into low-carbon MgO-C refractories to address the high cost of ZrN. The addition of ZrN significantly promoted the reaction and enhanced the mechanical properties of the refractories by promoting the formation of more ceramic phases, especially flake-like Mg2SiO4. The mechanism of ZrN in the MgO-C refractories was clarified through this study.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Engineering, Chemical
Wei Li, Xing Wang, Chengji Deng, Chao Yu, Jun Ding, Hongxi Zhu
Summary: Synthesizing Cr3C2-coated flake graphite by molten salt method and adding it to low-carbon MgO-C refractories can significantly improve the refractories' performance, especially in terms of physical properties and oxidation resistance.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Seungwook Lee, Yongsug Chung
Summary: This study observed the dissolution behavior of MgO-C in CaO-SiO2-Al2O3 ternary slag, and found that MgO had a shorter dissolution time than MgO-C, and particle fragmentation led to a decrease in dissolution time. The addition of C resulted in the formation of bubbles, with the main bubble reaction being C(s) + SiO2(l) = CO(g) + SiO(g).
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Xiaochuan Chong, Kaidi Li, Guoqing Xiao, Donghai Ding, Xing Hou
Summary: To produce high-performance low carbon MgO-C refractories, combustion synthesized MgO nanofibers containing C/MgO composite powders (SCM) were introduced. The inclusion of 6 wt% SCM in the refractories resulted in the best comprehensive properties, with significant enhancements in thermal shock resistance, oxidation resistance, and slag resistance. The unique microstructure of MgO nanofibers and carbon encapsulated MgO played a crucial role in improving the thermal shock resistance of the refractories.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
C. Atzenhofer, H. Harmuth
Summary: The application of Al or Si as antioxidants in MgO-C refractories leads to the in situ formation of new phases. The addition of SiC did not lead to the formation of new phases, but when Al and Si were added, carbides, nitrides, oxycarbonitrides, and oxynitrides were formed. The reaction series, its reason and its relation to equilibrium phase composition have been revealed in this study.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Yilong Wang, Wenli Zhang, Xiongfeng Zeng, Jiankun Huang, Yuejun Chen, Hengyong Wei, Junbo Tu
Summary: In this study, MgO-C refractories were prepared using various types of graphite and antioxidants, which resulted in the formation of carbon nanotubes and SiC fibers at high temperatures. The formation of these structures significantly improved the mechanical strength of the materials.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Construction & Building Technology
Yang Chen, Xing Wang, Chengji Deng, Chao Yu, Jun Ding, Hongxi Zhu
Summary: By introducing catalysts and ferric nitrate, a novel MgO-C refractory with excellent thermal shock resistance and corrosion resistance was successfully prepared, which was achieved by accelerating the formation of ceramic bonding phases and optimizing the microstructure.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Xing Wang, Yang Chen, Jun Ding, Chao Yu, Chengji Deng, Hongxi Zhu
Summary: Increasing nitriding temperature and adding catalyst can promote the formation of ceramic phases in MgO-C refractories, while excessive ceramic phases lead to sample expansion and increased porosity, reducing the physical properties of the materials.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Mingqiang Liu, Juntong Huang, Hongtao Meng, Cheng Liu, Zhi Chen, Huiyong Yang, Zhijun Feng, Xibao Li, Ruiying Luo, Zhaohui Huang, Shaowei Zhang
Summary: In order to reduce the total carbon content in low carbon steel smelting, it is urgently required to develop nano carbon containing magnesia graphite refractories. In this study, a novel low carbon magnesia-carbon refractory was developed by exfoliating flake graphite in phenolic resin to prepare graphite nanoplatelets, which were then used in MgO-C bricks. The addition of 2 wt. % graphite nanoplatelets and/or graphite nanoplatelets/phenolic resin mixture improved the overall performance of the refractories, including higher strength, better oxidation resistance, and slag corrosion resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xin Qi, Xudong Luo, Ling Zhang
Summary: In this study, low carbon content and high thermal shock resistance MgO-Mg2SiO4-SiC-C refractories were prepared. By analyzing the Hasselman thermal shock stability factor, it was found that reducing the thermal expansion coefficient, increasing the elastic modulus, and improving the fracture toughness contribute to enhancing the thermal shock resistance of the refractories. Molecular dynamics simulations demonstrated that SiC and Mg2SiO4 could serve as media for indirectly binding MgO and C, which effectively strengthened the refractories.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Sebastian Sado
Summary: MgO-C refractories are widely used in key heat devices of steel and iron metallurgy, facing various corrosive factors. The oxidation of carbon and loss of properties in MgO-C refractories caused by low-temperature decarburization is a significant issue. In addition, MgO-C materials are vulnerable to the direct attack of liquid slag or steel melt. Therefore, it is important to develop high-quality MgO-C materials with lower cost. This article presents a method for selecting raw materials to produce MgO-C bricks with comparable properties, and the corrosion resistance of selected materials was tested.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Florian Kerber, Tilo Zienert, Jana Hubalkova, Volker Stein, Thomas Schemmel, Helge Jansen, Christos G. Aneziris
Summary: This study investigated the interactions between three industrially fabricated MgO-C bricks and liquid steel through immersion tests. The results showed that the MgO grade had an impact on the structure and frequency of the specimens, as well as the types and distribution of inclusions in the solidified steel.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Xuan Wang, Chengji Deng, Jinghui Di, Guangchao Xing, Jun Ding, Hongxi Zhu, Chao Yu
Summary: The synergistic effects of Al3BC3-Al antioxidants in optimizing the oxidation resistance of low-carbon MgO-C refractories were investigated. It was found that optimized Al3BC3-Al additions resulted in significantly lower oxidation index and rate constant compared to samples containing Al or Al3BC3. The formation of a dense MgO-MgAl2O4-Mg3B2O6 layer contributed to superior oxidation resistance, and the self-repairing function was achieved even at high temperatures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yamila S. Lagorio, Sebastian E. Gass, Edgardo R. Benavidez, Analia G. Tomba Martinez
Summary: This study evaluates the thermomechanical properties of three different MgO-C bricks and proposes an alternative thermal shock test. The results indicate that bricks with higher amounts of aluminum and graphite, bonded with resin, exhibit better response to thermal shock.
CERAMICS INTERNATIONAL
(2022)
