Article
Materials Science, Ceramics
Junmo Jeon, Daniel Lindberg
Summary: Thermodynamic optimization was performed for the binary MgO-ZnO and CaO-ZnO systems and ternary CaO-MgO-ZnO system by studying phase equilibria. Bragg-Williams random mixing model and Modified Quasichemical Model were used for solid solutions and liquid solutions, respectively. The optimized phase diagrams matched well with experimental results of phase equilibria. Phase equilibria studies were conducted at various temperatures for MgO-ZnO and CaO-MgO-ZnO systems, and SEM/EDS analysis of quenched samples confirmed equilibrium phases. Liquid phases were newly observed at 1550 degrees C and 1600 degrees C in the CaO-MgO-ZnO system.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Zehua Zhou, Xiaoyun Li, Qiufeng Huang, Zhonghua Deng, Zhuguang Liu, Jiquan Huang, Jian Chen, Wang Guo
Summary: By using CaO as a sintering additive, highly transparent MgO ceramic was prepared by hot isostatic pressing (HIP) technique of vacuum-sintered MgO compact. The densification process of MgO ceramic is significantly enhanced by doping 0.5 at% CaO at the vacuum-sintering temperature of 1100-1350 degrees C. The resulting ceramic exhibits high transmittance and thermal conductivity, making it a promising material for phosphor composite ceramics.
CERAMICS INTERNATIONAL
(2023)
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
Qilong Chen, Tianbin Zhu, Yawei Li, Yong Cheng, Ning Liao, Liping Pan, Xiong Liang, Qinghu Wang, Shaobai Sang
Summary: A new approach was proposed in this study to enhance the performance of low-carbon MgO-C refractories by incorporating composite powders. It was found that this method significantly improved the thermal shock and slag resistance of the refractories, attributed to the toughening of zirconia and optimization of pore structure.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Ziwen Yan, Zhiyin Deng, Miaoyong Zhu
Summary: Laboratory experiments were conducted to investigate the effect of adding CaCl2 on the penetration behavior of BOF slags in MgO refractory. The results showed that the penetration depth increased with experimental time. The addition of CaCl2 enhanced the penetration depth by reducing the viscosity, surface tension, and contact angle of the slag. Improved fluidity and wettability were identified as the main reasons for the increased penetration depth. The degradation of MgO refractory by CaCl2-added BOF slag was discussed, with both chemical reactions and slag penetration playing a role. The structure of the MgO refractory significantly influenced the degradation, as the addition of CaCl2 had differing effects on dense and porous refractory.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Article
Materials Science, Ceramics
Carmen Baudin, Pilar Pena
Summary: The severity of working conditions for refractories and the availability of economically feasible raw materials have led to changes in the design approach for materials experiencing in situ modifications during use. This work discusses guidelines for formulating basic refractories with calcium zirconate-based matrices and examines the effects of composition on microstructural development, mechanical behavior, and corrosion resistance.
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
(2022)
Article
Materials Science, Ceramics
Tingting Xu, Yao Su, Tao Shi, Xiangdong Zhang
Summary: By depositing CaZrO3 coatings on MgO-CaO ceramics, their hydration resistance was significantly improved. After calcination, most of the CaO transformed into CaZrO3 and was located at the grain boundaries, leading to enhanced performance of the ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yunming Gao, Hucheng Zhang, Qiang Wang, Guangqiang Li
Summary: The wetting and corrosion behavior of the corundum substrate anode by CaO-SiO2-MgO molten slag was investigated using the sessile drop method with applied voltage and SEM-EDS technique. The results showed that applied voltage can inhibit slag penetration, but high voltage can aggravate the direct dissolution and physical stripping of the anode.
CERAMICS INTERNATIONAL
(2022)
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, Multidisciplinary
Ankur Sharma, D. B. Karunakar
Summary: The addition of MgO to ZrB2-SiC composites can reduce sintering temperature, enhance fracture toughness, and improve ablation resistance. Composites containing 2 vol% MgO exhibit the optimal performance in terms of relative density, microhardness, fracture toughness, and ablation resistance.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Construction & Building Technology
Zhen Li, Ying Hua, Zixun Chang, Yanfei Yue, Jihui Qin, Jueshi Qian
Summary: This study investigated the effect of lime addition on the performance and CO2 sequestration capacity of blended reactive MgO cement (RMC). The results showed that the incorporation of lime promoted the setting and initial heat generation of RMC, and increased its CO2 absorption capability. Carbonation curing improved the strength and microstructure of the blended RMC by reducing porosity and increasing density. Samples with 20% lime content had significantly higher compressive strength compared to plain samples.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Yibiao Xu, Zhao Hu, Yawei Li, Wen Yan, Yajie Dai, Liping Pan
Summary: The addition of microscale ZrSiO4 powder improved the performance of free CaO containing magnesia, resulting in increased relative density, improved hydration resistance, enhanced thermal shock resistance, and improved slag penetration resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
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
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)
