Article
Construction & Building Technology
Amir Hossein Mahmoud Hosseiny, Abolhassan Najafi, Gholamreza Khalaj
Summary: This research studied the effect of the CaO/MgO ratio on the transformations and formation of phases during fast firing of ceramic tiles. The weight percentage of the Anorthite phase increased with the decrease in the CaO/MgO ratio, while the thermal expansion coefficient decreased. Microstructural studies showed that the Gehlenite phase was removed and the Anorthite phase was increased by fine-graining the primary sources.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Leibo Deng, Wenwei Lu, Zhen Zhang, Zhe Fu, Hao Li, Hua Chen, Yongsheng Du, Yonghong Ma, Wencai Wang
Summary: Glass ceramics were successfully prepared from Cr-bearing slag, and the effect of slag content on crystallization behavior and morphology was investigated. The results showed a consistent decrease in crystallization activation energy with increasing slag content in the samples. Additionally, the study suggested that CMAS glass ceramics could be synthesized from Cr-bearing slag without the need for an additional nucleating agent.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Ceramics
Liu Guo, Shengqiang Song, Yuandong Mu, Guotian Ye, Liugang Chen
Summary: Reactive MgO was used as an alternative hydraulic binder of calcium aluminate cement (CAC) to prepare Cr2O3-bearing refractory castable for the first time. The formation of Cr(VI) and the physical and mechanical properties of the MgO-bonded refractory castables after heat-treating were investigated. The results showed that the Cr(VI) levels were significantly lower using reactive MgO, and the in situ Mg(Cr,Al)2O4 spinel contributed to the inhibition of Cr(VI) formation and strength development.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Kunkun Cui, Haobo Mao, Yingyi Zhang, Jie Wang, Fuqiang Shen
Summary: This study investigated the microstructure and mechanical properties of Al2O3-Cr2O3 composites and analyzed the corrosion and infiltration behaviors caused by high-temperature slag. The results indicated that the thickness of the corrosion layer decreased significantly with increasing Cr2O3 content, while the thickness of the infiltration layer increased gradually. Increasing the amount of Cr2O3 improved the slag corrosion resistance but had a negative effect on the slag infiltration resistance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hongrui Zhang, Mengqiang Wang, Quanli Jia, Zheng Zhang, Lei Lei, Liugang Chen
Summary: The degradation behavior of RM-bonded Cr2O3-bearing castables in steel-making slag was investigated. The results showed that the RM-bonded castables exhibited superior slag corrosion resistance and infiltration resistance due to the formation of spinel.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Tengteng Xu, Mithun Nath, Yibiao Xu, Yawei Li, Ning Liao, Shaobai Sang
Summary: In this study, Al2O3-CaO-Cr2O3 castables were heated at 300-1500 degrees C in air and coke bed to simulate actual service conditions. The formation of various phases was investigated by XRD and SEM-EDS. Different compounds were found to form at different temperatures, with significantly lower Cr(VI) concentrations observed in specimens treated in coke bed compared to those treated in air. The study also showed that mutual diffusion between Cr2O3 and Al2O3 was suppressed in coke bed, hindering the sintering process and impacting the density and strength of the castables.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Mithun Nath, Shengqiang Song, Ning Liao, Tengteng Xu, Hang Liu, Himansu Sekhar Tripathi, Yawei Li
Summary: In the Al2O3-CaO-Cr2O3 system, a high-temperature stable Cr3+ ternary compound CaAl2Cr2O7 was successfully synthesized, and its formation stability with hydraulic calcium aluminates was investigated at 1500 degrees C. The formation of CaAl2Cr2O7 showed a correlation with the Cr2O3 content, while co-existence with CAC and other phases was observed.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Chen-yang Xu, Cui Wang, Ren-ze Xu, Jian-liang Zhang, Ke-xin Jiao
Summary: The study revealed that as the Al2O3 content increases, the viscosity of the slag gradually rises, along with the apparent activation energy. Fourier-transform infrared spectra also confirmed that the addition of Al2O3 can enhance the polymerization of the slag structure.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Thermodynamics
Melinda Majerova, Anna Prnova, Jozef Kraxner, Beata Pecusova, Alfonz Plsko, Dusan Galusek
Summary: In this study, Bi doped gehlenite glasses were prepared using conventional melting method. The addition of Bi led to a decrease in the crystallization temperature of gehlenite crystals. The thermal properties and crystallization kinetics of the glasses were studied using differential thermal analysis and X-ray diffraction.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Materials Science, Ceramics
Tengteng Xu, Ning Liao, Yibiao Xu, Mithun Nath, Yawei Li, Yibo Chen, Shaobai Sang
Summary: This study achieved in situ detoxification of Cr(VI) in Al2O3-Cr2O3-CaO castables by introducing zeolite, which reduced the leaching of Cr(VI), promoted the formation of solid solution, and enhanced the densification of the castables.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Fang Yuan, Zheng Zhao, Yanling Zhang, Tuo Wu
Summary: The effect of Al2O3 content on the viscosity and structure of CaO-SiO2-Cr2O3-Al2O3 slags was investigated. The results showed that within a certain range, the viscosity of the slag is significantly influenced by the Al2O3 content, and the Cr2O3-containing slag requires less Al2O3. Raman spectra revealed structural changes in the slag, and the dissolved organic phosphorus content correlated with the viscosity and Raman results.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Kh S. Shaaban, Ateyyah M. Al-Baradi, Atif Mossad Ali
Summary: The 65Na(2)B(4)O(7)-25SiO(2)-(10 - x) CaO-x Cr2O3 glass system was synthesized and investigated for its optical, structural, and radiation shielding characteristics. The addition of Cr2O3 increased the density and decreased the molar volume of the glass. The study also found that the optical properties and radiation shielding ability of the glass were influenced by the presence of Cr2O3. These findings provide valuable insights for the development of glass materials with neutron attenuation applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jun Gil Yang, Joo Ho Park, Ji Yeon Kang, Hyun Sik Park, Joo Hyun Park
Summary: The study found that gold solubility in the CaO-SiO2-Al2O3-Fe2O3 slag system increases with increasing slag basicity, while the influence of Fe2O3 and Al2O3 on gold solubility is minimal. Gold is stabilized as the aurate complex ion, and its dissolution reaction into the slag was proposed.
Article
Materials Science, Ceramics
Lejun Zhou, Houfa Wu, Wanlin Wang, Hao Luo, Huan Li
Summary: The crystallization behavior and melt structure of two typical mold fluxes for casting high-aluminum steel were explored. Flux B showed a higher crystallization temperature and shorter incubation time compared to Flux A, with different precipitated phases and melt structures. These differences in melt structures contribute to the varying crystallization abilities of the two fluxes.
CERAMICS INTERNATIONAL
(2021)
Article
Thermodynamics
Kai Tang, Casper van der Eijk, Sylvain Gouttebroze, Qiang Du, Jafar Safarian, Gabriella Tranell
Summary: A phenomenological viscosity model inspired by the Calphad technique is proposed in this study to describe the rheological properties of Al2O3-CaO-SiO2 slags. The model successfully calculates the isothermal time-temperature-transformation and non-isothermal continuous-cooling-transformation curves.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2022)