Article
Materials Science, Ceramics
Man Zhang, Jianhua Liu, Junwen Zhou
Summary: The effect of Eu2O3 doping amount on the densification behavior of MgAl2O4 and its corrosion resistance to aluminum electrolyte was studied. The results showed that Eu2O3 doping contributed to the densification of MgAl2O4, and the sample with 3 wt.% Eu2O3 had the highest relative density and hardness. Additionally, this sample exhibited the best corrosion resistance to aluminum electrolyte.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Biomedical
Mehran Ghodrati, Seyed Mahdi Rafiaei, Lobat Tayebi
Summary: In this study, magnesium aluminate spinel (MgAl2O4) nanoparticles were synthesized using a combustion approach and then incorporated into PLA to prepare scaffolds. The crystal structure, microstructure, biodegradability, and thermal characteristics of the materials were investigated using XRD, FESEM, ICP, STA, and compressive strength analyses. The results showed that PLA/6 wt% MgAl2O4 scaffolds exhibited the highest compressive strength. Immersion of the scaffolds in SBF revealed improved biodegradability, while improper particle dispersion occurred at higher MgAl2O4 loadings.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Markus Mader, Richard Prediger, Karl G. Schell, Gabriela Schmidt, Alex Dorn, Sophie Jenne, Sebastian Kluck, Leonhard Hambitzer, Manuel Luitz, Claudia Schwarz, Marcel Milich, Christian Greiner, Bastian E. Rapp, Frederik Kotz-Helmer
Summary: This study develops a thermoplastic nanocomposite that can be shaped into transparent ceramics using polymer injection molding. The process involves several steps to achieve high density, high optical transmission, and high mechanical strength in the transparent ceramics. By making transparent ceramics accessible to high-throughput polymer processing techniques, this research enables fast and cost-efficient manufacturing of macroscopic and microstructured components, opening up a wide range of potential applications.
Article
Materials Science, Ceramics
Somnath Sinhamahapatra, Chandrima Ghosh, Himansu Sekhar Tripathi, Sunanda Mukhopadhyay
Summary: The magnesium aluminate spinel was prepared from constituent oxides through a solid-state sintering process at temperatures ranging from 1550 to 1700 degrees C in a normal air atmosphere. The addition of TiO2 and Yb2O3 improved the densification and mechanical properties of the magnesia-rich spinel, with Yb2O3 showing better performance in room temperature flexural strength.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ming Shi, Ying Li, Junjie Shi
Summary: A novel method for fabricating periclase and magnesium aluminate spinel refractory from secondary aluminum dross was proposed. The study analyzed the fabrication mechanism and studied the effects of MgO addition and sintering temperature on the properties of refractories. The results showed significant improvement in purity, crystallinity, densification, flexural strength, and impact toughness with increasing sintering temperature and MgO addition.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Aref Basiri, Amir Hossein Nassajpour-Esfahani, Mohammad Reza Haftbaradaran-Esfahani, Amir Alhaji, Ali Shafyei
Summary: This study investigated the granulation process of magnesium aluminate spinel powders using spray freeze drying method. The optimal amount of binder was found to be 3%, and the ideal solid load was determined to be 35 wt%, resulting in granules of 10-50 μm in size. Powder granulation increased density by approximately 20% and improved the in-line transmission for the IR range by over 15%.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Ali Talimian, H. F. El-Maghraby, Monika Michalkova, Dusan Galusek
Summary: Adding 0.3 wt% lithium hydroxide can promote densification and limit grain growth of MgAl2O4, while also affecting the activation energy of sintering. The formation and disappearance of secondary phases were observed, with magnesium oxide and lithium aluminum oxide produced at certain temperatures.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Hu Tang, Zhenggang Jia, Bing Li, Huazhong Chen, Wenjie Yuan
Summary: In order to achieve the goal of dual-carbon, attention has been paid to induction furnaces with high efficiency and energy-saving advantages in the foundry and metallurgy industries. The service life and safety of induction furnaces strongly depend on the lining, which can be eroded and have poor slag resistance due to expansion and forward sintering. This study focused on the properties of alumina-magnesia-based dry ramming mixes and replaced calcined magnesia particles with a novel multi-component material, calcium magnesium aluminate (CaO-MgO-Al2O3, CMA), with a size of 200 mesh. The effects of CMA on the bulk density, apparent porosity, strength, and slag corrosion resistance of the dry ramming mixes were evaluated. The results showed that the addition of CMA reduced the slag penetration index and permanent linear change in the dry ramming mixes.
Article
Materials Science, Ceramics
Wenyu Zan, Beiyue Ma, Yutong Cao, Jialong Tian, Zhangyan Zhou, Lulu Wang, Zhouhua Jiang
Summary: In this study, MgAl2O4 spinel materials were synthesized using a single-step reaction sintering method. The effects of (MgO + Al2O3) content, molding pressure, and YSZ additive on the properties of the material were investigated. The results showed that increasing (MgO + Al2O3) content and molding pressure favored the formation of the second MgAl2O4 spinel but also increased the apparent porosity. YSZ addition induced defects and improved the sintering and mechanical properties. The optimal material was obtained with the addition of 1 wt% YSZ, 80 wt% of (MgO + Al2O3), and molding at 200 MPa, followed by sintering at 1600 degrees C for 2 h. The material exhibited high strength retention and comprehensive performance after thermal shock.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Anu Sharma, Manu Krishnan, Gurudatta Ganganahalli, Seema Saraswathy, Papiya Biswas, Roy Johnson, Kurian Mathew Abraham, Satish R. Iyer
Summary: The magnesium aluminate-based polyphasic composite scaffold demonstrated physical and biological characteristics essential for in vitro craniofacial bone tissue engineering, including good compressive strength, porosity, cell viability, and mineralization.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Worachita Wongtawee, Pongsaton Amornpitoksuk, Chamnan Randorn, Tanattha Rattana, Sumetha Suwanboon
Summary: A nanocomposite photocatalyst consisting of MgAl2O4 spinel and WO3 powders was synthesized through grinding. Characterization using various techniques revealed the presence of WO3 and MgAl2O4 in the nanocomposite. The nanocomposite showed a shift in absorption edge and a decrease in optical band gap energy compared to pure WO3. The nanocomposite also exhibited higher photocatalytic degradation efficiency for methylene blue, with the most complete degradation achieved using a 20%WO3/MgAl2O4 nanocomposite.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Biswajit Baruah, Ritwik Sarkar
Summary: This study investigated the effect of samarium oxide (Sm2O3) as an additive on the properties of stoichiometric magnesium aluminate spinel using different raw material sources. Six spinel batches were prepared with commercially available alumina and magnesia, and the effect of Sm2O3 addition on the properties of the spinel compositions was studied. The results showed that 1% of Sm2O3 addition led to improved densification and strength of the spinel compositions.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Chemical
Inna G. Antropova, Aryuna D. Budaeva, Darya P. Khomoksonova, Seseg Yu. Batueva, Pavel A. Gulyashinov
Summary: This article focuses on the deep processing of synnyrite to produce valuable agricultural and technical products. The research shows the promise of using magnesite instead of limestone in the thermochemical activation process, which reduces costs and generates an additional useful product. The article also presents a new method for processing alum obtained from synnyrite to produce potassium magnesium sulfate and magnesium aluminate spinel.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Physical
Xiuyi Liu, Zhe Chen, Wen Yan, Jingran Wang, Sanbao Ma, Guangqiang Li
Summary: Lightweight design and preparation of refractories can contribute to energy saving and emissions reduction in high temperature furnaces. Two lightweight periclase-magnesium aluminate spinel refractories were prepared using microporous aggregates and compared to commercial dense refractories. The results showed that the lightweight specimens had increased strength, reduced thermal conductivity, and improved microstructure due to the microstructure of the microporous aggregates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
R. Salomao, C. C. Arruda, V. C. Pandolfelli, L. Fernandes
Summary: By varying the ratios of Mg(OH)2-Al2O3 and sintering temperature, structures with tailored porosity, compression strength, thermal conductivity, and pore sizes in the range of 15 μm were obtained, suitable for high-temperature materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
