Article
Materials Science, Multidisciplinary
Wenbin Wang, Zidong Wang, Shigang Wang, Zhiming Shi
Summary: Porous quartz ceramics with different pore structures were prepared by self-sintering, and the particle size of desert sand played a key role in the sintering process, affecting the ratio of silica to feldspar phases.
Article
Materials Science, Ceramics
Yeqing Ling, Xiandong Hao, Yuxi Gui, Hongju Qiu, Qiannan Li, Hewen Zheng, Mamdouh Omran, Lei Gao, Jin Chen, Guo Chen
Summary: Nanosized CeO2-ZrO2 powders prepared by atmospheric pressure pyrolysis were used as raw materials to prepare CeO2-ZrO2 ceramics using microwave sintering. When the CeO2 content is more than 5 mol%, the tetragonal phase peak appears in the sample, and the grain size of the ceramics is negatively related to Ce content. CeO2 reduces the solid solution's phase transformation temperature with microwave heating.
CERAMICS INTERNATIONAL
(2021)
Article
Thermodynamics
Fan Yang, Weihua Xie, Songhe Meng
Summary: Ceramic matrix composites with excellent oxidation resistance are desirable for the thermal protection system of hypersonic flight vehicles. Transpiration cooling has been proven to be an effective method, and SiC porous ceramics show superior performance in this cooling technique.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Bola Yoon, Viviana Avila, Isabela R. Lavagnini, Joao V. Campos, Lilian M. Jesus
Summary: Reactive flash sintering (RFS), a novel electric field-assisted sintering technique, has gained significant interest due to its remarkable time and cost efficiency. This review provides a comprehensive overview of RFS, aiming to enhance the understanding of the process and draw the attention of scientists and engineers to this new technique.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
Hao Li, Cuiwei Li, Huaiming Jia, Guangjin Chen, Siyuan Li, Kepi Chen, Chang-An Wang, Liang Qiao
Summary: In this paper, cordierite-based porous ceramics with magnetic properties were synthesized by using MgO, Al2O3, and SiO2 powders as raw materials and Fe3O4 as a functional additive. The addition of Fe3O4 reduced the synthesis temperature of cordierite and influenced the magnetic properties of the prepared materials. The facile fabrication method proposed in this paper has great practical value.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Green & Sustainable Science & Technology
Siyi Zhao, Jinhong Li, Yifan Wu, Shuang Song, Lijie Liu
Summary: Porous TiO2 ceramics (PTC) with high porosities and controllable pore structure were prepared, and a novel composite phase change material PTCN1-4 with high heat storage capacity and shape stability was successfully manufactured. The results demonstrated promising potential for PTC as a high temperature heat storage carrier material.
Article
Materials Science, Multidisciplinary
Edward L. Pang, Gregory B. Olson, Christopher A. Schuh
Summary: The study systematically investigates the thermal hysteresis in ZrO2-CeO2 shape-memory ceramics, revealing the impact of CeO2 content on hysteresis through calorimetry measurements and in situ X-ray diffraction analysis. The findings provide insights into the controlling factors of hysteresis in SMCs and clarify previous contradictory reports in the literature.
Article
Chemistry, Physical
Xi Shi, Udo Eckstein, Yizhe Li, David Hall, Neamul H. Khansur
Summary: In situ, spatially-resolved synchrotron X-ray diffraction was used to investigate the electric field-induced phase transformation of nonergodic relaxor 0.93Na(1/2)Bi(1/2)TiO(3)-0.07BaTiO(3) ceramics. The study found that the copper electrode side coated by aerosol deposition exhibited more significant lattice strain and domain texture compared to the platinum side deposited by sputter deposition.
JOURNAL OF MATERIOMICS
(2022)
Article
Materials Science, Ceramics
Si-Chun Luo, Wei-Ming Guo, Kevin Plucknett, Hua-Tay Lin
Summary: In this study, high toughness and high hardness Si3N4 ceramics with fine and bimodal microstructure were successfully prepared by adding HfB2 and using spark plasma sintering (SPS). The introduction of HfB2 promoted phase transformation, significantly improving the toughness while slightly decreasing the hardness of Si3N4 ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Sha Lyu, Yanjing Wang, Jintao Huang, Tao Li, Dandan Li, Jaw-Kai Wang, Jiangtao Zhang, Dazhi Sun, Peng Yu
Summary: By controlling the sintering temperature, high-strength bimodal porous ceramics were successfully fabricated, maintaining multilayer pore structures. Sintering DFs under 1050 degrees Celsius can achieve high compressive strength and suitable porosity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Mehrdad Zarinejad, Tim White, Yunxiang Tong, Sajjad Rimaz
Summary: This study investigates the relationship between the chemistry of ceramics and martensitic transformation temperatures, finding a clear correlation between valence electron ratio and transformation temperatures. Aliovalent doping is shown to alter the valence electrons and influence the transformation temperatures.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
Ao Tian, Jian Fu, Zide Yu, Ruzhong Zuo
Summary: This study investigates the influence of ABO3 characteristics on phase transformation behavior in NN-BT-xABO3 ceramics. It is found that the B-site ion radius plays a key role in inducing phase transformation, with small Ti4+ ions causing normal-relaxor ferroelectric phase transformation and larger Zr4+ ions leading to the appearance of the observed R phase in lead-free NaNbO3-BaTiO3-based piezoelectric ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Advaith Rau, Ken Knott, Kathy Lu
Summary: Bulk and porous SiOC materials were synthesized using a PDC method with Fe catalyst, showing enhanced beta-SiC content and phase separation of the amorphous SiOxCy phase. Fe-catalyzed samples at 1100 degrees C exhibited significant beta-SiC content and improved gas sorption capabilities. Gibbs free energy minimization method and vapor-liquid-solid (VLS), solid-liquid-solid (SLS), and classical nucleation theories were used to analyze the Fe effect on the phase content of the pyrolyzed samples.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Ceramics
Qiang Jing, Fan Zhang, Liwen Lei, Jinyong Zhang
Summary: 3Y-TZP ceramics were prepared using the solid state method and surface carburization process. The effect of surface carburization on low temperature degradation was investigated. It was found that the surface carburized samples exhibited much longer failure time and lower nuclear growth rate compared to the conventionally sintered samples. Carbon dissolved in the zirconia lattice in the form of electrically neutral atoms without disrupting the original charge balance. The precipitation rate of Y3+ from the zirconia lattice was identified as the key factor in determining the low-temperature phase transition. The surface carburization treatment significantly improved the low-temperature degradation performance of 3Y-TZP ceramics, making them suitable for application in low-temperature and humid environments.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Qinlei Wei, Chaoyu Ma, Mengjie Zhao, Guozhong Ren, Chunhui Su
Summary: The effects of Tb3+ and Yb3+ co-doping on the crystal phase and luminescence properties of glass ceramics were studied, with adjustments in doping concentration leading to phase transitions and determination of optimal Tb3+ doping concentration and Tb3+/Yb3+ ratio.
Article
Materials Science, Ceramics
R. Vargas, X. Pinelli, B. Smaniotto, F. Hild, R. B. Canto
Summary: This study measured the fracture energy of high-alumina refractory with mullite-zirconia aggregates at 600℃, showing that an increase in sintering temperature led to a higher fracture energy for the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Materials Science, Ceramics
A. P. Luz, M. H. Moreira, M. A. L. Braulio, C. Parr, V. C. Pandolfelli
Summary: This review mainly addresses the theoretical aspects related to the drying process of dense refractories, the influence of phase transformations derived from binder additives, and the usual and advanced experimental techniques to assess water removal from consolidated castable pieces. Due to the complex nature of the phenomenon, the mechanisms behind the water withdrawal and castables' explosive spalling lack further understanding, making it difficult to save time and energy during the first heating of industrial equipment lined with ceramic materials.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
R. Vargas, R. B. Canto, F. Hild
Summary: This study proposes a method to estimate fracture energy from notch opening displacement (NOD) measurements when crack mouth opening displacements (CMODs) are not accessible. NODs and CMODs were calculated for two WST experiments on a castable refractory using digital image correlation (DIC) and finite element simulations. The results show that NOD data can effectively estimate crack propagation energy when CMODs cannot be measured.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
B. P. Bezerra, A. P. Luz, R. Salomao, V. C. Pandolfelli
Summary: Polymeric fibers can act as drying additives for refractory compositions to enhance their explosion resistance. The changes in fiber morphology during softening and melting process have a significant impact on the drying behavior of refractory castables.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
A. P. Luz, M. H. Moreira, R. Salomao, M. A. L. Braulio, V. C. Pandolfelli
Summary: This article focuses on the drying process and its influencing factors of monolithic dense refractories, including the effects of drying agents on material microstructure and the related effects of heating program design. Recent advances indicate that appropriate drying additives and engineering techniques can improve the safety and stability of refractory materials.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Murilo Henrique Moreira, Stefano Dal Pont, Alessandro Tengattini, Ana Paula Luz, Victor Carlos Pandolfelli
Summary: This study utilized rapid neutron tomography to investigate the in-operando drying behavior of a high-alumina refractory castable, and proposed a new experimental layout for truly simulating the drying phenomenon. By eliminating artifacts and experimental limitations, it provided direct evidence that moisture accumulates ahead of the drying front. The study also laid the foundation for further research and the validation and characterization of numerical models for partially saturated porous media.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
M. H. Moreira, S. Dal Pont, A. Tengattini, V. C. Pandolfelli
Summary: Refractory castables are commonly used materials for high-temperature processes due to their excellent performance and easy installation. However, their operational condition is hindered by the slow drying stage required. This study investigates the effect of heating rate on moisture clog and finds that higher heating rates lead to faster and longer-lasting water accumulation, aligning with previous studies and explaining the preference for slower heating rates in industrial operations. The study highlights the potential of neutron imaging in maximizing the efficiency of the drying process of refractory castables.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Rafael Salomao, Leandro Fernandes
Summary: The hydroxylation behavior of magnesia (MgO) has been extensively studied in dilute suspensions, but its effects on concentrated systems have not been systematically analyzed. In this study, the hydroxylation behavior of different sources of magnesia in aqueous suspensions with various solids concentrations was investigated. The results showed that the hydroxylation degree, volumetric expansion, and maximum internal temperature during curing were more pronounced in suspensions containing caustic magnesia. Despite the small quantity of hydroxylation products formed, compositions with higher solid loads had higher reaction yield levels. Significant differences in the microstructure of the products were observed and attributed to the ions' mobility towards crystallization nuclei.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Ceramics
J. A. P. Sardelli, O. H. Borges, C. Pagliosa Neto, V. C. Pandolfelli
Summary: The increasing need for cleaner steels has led to the development of zero-carbon bricks. These refractories offer advantages such as lower thermal conductivity and no direct CO2 emissions, reducing thermal losses and environmental impacts. This study compared the addition of spinel-like inducers (MgO or ZnO) to enhance the properties of these refractories and assessed the diffusion mechanisms and the role of the Kirkendall effect on their physical and thermomechanical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
M. H. Moreira, F. P. Schmidt, A. L. F. Cardoso, R. F. Klein-Gunnewiek, V. C. Pandolfelli
Summary: Refractory castables are suitable for high-temperature industrial equipment but have a long drying process. The use of microwave heating can reduce time and carbon dioxide emissions, making it a promising solution.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
I. C. Finhana, P. F. dos Santos, O. H. Borges, D. N. F. Muche, V. C. Pandolfelli
Summary: Calcium aluminate cement is commonly used as a binder for ceramic materials, providing suitable setting times and strength. By milling the cement in water, a stable suspension can be formed, resulting in improved performance in low-temperature thermal insulation applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Rafael Salomao, Isabela S. Martinatti, Leandro Fernandes, Andreas Sundblom, Peter Greenwood, Paulo R. T. Tiba
Summary: This study used a novel aqueous dispersion of colloidal silica, whose particles' surfaces were modified with an epoxysilane-based coupling agent, to combine with fine MgO powder, generating self-flowing MgO-colloidal silica suspensions of excellent workability. After curing, a dense magnesium silicate hydroxide hydrate protective coating formed over MgO particles, hindering their hydroxylation and volumetric expansion. During thermal treatment, softened silica particles promoted densification. The microstructure after sintering comprised dense MgO grains surrounded by thin layers of forsterite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Biomedical
P. R. Minim, L. J. de Azevedo-Silva, B. M. Ferrairo, L. F. Pereira, C. A. Goulart, R. S. Monteiro-Sousa, P. N. Lisboa, C. A. Fortulan, R. Saloma, A. F. S. Borges, H. Rubo
Summary: This study assessed the effects of adding polyvinyl butyral (PVB) in combination with two sintering methods on the mechanical properties of polycrystalline bovine HA bioceramics. The results showed that samples sintered using the conventional method without binders exhibited the best mechanical properties.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Rafael Salomao, Leandro Fernandes, Luiz Carlos Simao
Summary: This paper introduces a novel microporous MgO-based thermal insulator with temperature-resistant microporous structure. The controlled packing flaws were introduced among highly asymmetric and porous particles during uniaxial pressing. The study shows that thermal treatments have little effect on the microporous microstructure generated during pressing. The thermal conductivity, total porosity, and compression strength of the samples vary at different temperatures.
Article
Materials Science, Ceramics
M. H. Moreira, H. Peng, S. Dal Pont, V. C. Pandolfelli
Summary: Refractories play a crucial role in industrial development, but there are size effects differences between small laboratory samples and large-scale equipment. This study investigates the impact of size effects on water removal dynamics during thermogravimetry tests and finds that increasing the heating rate of small samples can better mimic the drying process of large equipment. The addition of polymeric fibers reduces the intensity of the size effect. A kink in the temperature evolution of cubic samples with sizes equal to or larger than 10 cm is observed, possibly due to rapid evaporation of liquid water. This research emphasizes the importance of considering size-dependent drying dynamics in refractory materials.
CERAMICS INTERNATIONAL
(2023)
