Article
Chemistry, Physical
Asapu Vinaya Kumar, V. Subramanian, V. Sivasubramanian
Summary: This paper reports a significant change in the microwave dielectric properties of ZnNb2O6 by heterovalent substitution of Ti4+ and W6+ in Nb-site forming a solid solution Zn(Nb1-2xTixWx)2O6.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Kedarnath Rane, Prashant Date, T. S. Srivatsan
Summary: This paper investigates the utilization of shop-floor ferrous scrap containing iron ore for making steel products by in situ carbothermic reduction. Powder metallurgy (PM) technique was employed to study reduction and densification during sintering. Different sources of iron oxide and carbonaceous materials were considered, and the presence of distinct iron-oxide phases and carbothermic reduction contributed to higher degree of reduction and densification in grinding sludge compared to iron ore. The shape stability of sintered grinding-sludge powder was optimized by adjusting parameter settings and applying proper temperature and pressure. Therefore, ferrous scrap can be utilized as direct reduced iron for steel production and for cost-efficient and eco-friendly structural components.
Article
Chemistry, Multidisciplinary
Antonio Iacomini, Sebastiano Garroni, Nina Senes, Gabriele Mulas, Stefano Enzo, Matteo Poddighe, Alvaro Garcia, Jose F. Bartolome, Lorena Pardo
Summary: In this study, piezoceramics of lead-free composition K0.5Na0.5NbO3 were prepared with various concentrations of MgNb2O6 and sintered at 1100 degrees C. The addition of magnesium niobate improved densification of the ceramics and optimal dielectric and piezoelectric properties were achieved with 0.5-1.0 wt.% of MgNb2O6.
Article
Materials Science, Multidisciplinary
Kai Miao, Liangjie Liu, Jiwei Cao, Ran He, Sai Li, Lingling Wu, Zhongliang Lu, Dichen Li
Summary: In this study, a pioneering approach is developed to achieve zero shrinkage for porous alumina ceramics during multistep sintering, using a combination of active fillers - ZrAl3 and Al75Si25. The material compositions and sintering process are optimized using the response surface method to achieve shrinkages of less than 0.05% for the entire process. The sintering expansion mechanism is investigated, and the suggested approach shows potential applications in near-net, low-defect fabrication of complex fine ceramic components.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Materials Science, Ceramics
Anna Galotta, Vincenzo M. Sglavo
Summary: Cold sintering process (CSP) has gained global attention for its environmentally friendly and innovative fabrication route, reducing processing time, energy, and costs significantly. The process densifies ceramic powder with the aid of a liquid phase under intense pressure and limited heating conditions, achieving extraordinary results. The review explores processing features, possible densification mechanisms, and challenges, paving the way for new processing opportunities in the future.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Muhammad Imran, Lea Deillon, Irina Sizova, Bram Neirinck, Markus Bambach
Summary: This study focuses on the possibility of manufacturing multi-material structures using spark plasma sintering (SPS), expanding the application of this process by utilizing the specific properties of different materials. By characterizing the sintering behavior of two different materials, CuCrZr and nickel, at various conditions, and representing the densification data using master sintering curves and surfaces, optimal sintering conditions were determined for processing multi-material structures. CuCrZr-Ni multi-material samples were successfully sintered using these parameters.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Inorganic & Nuclear
Lei Zhong, Sha Jiang, Xihui Wang, Yutong Wang, Jialiang Xie, Yanru Li, Binyao Huang, Yongjie Wang, Guotao Xiang, Li Li, Xianju Zhou, Min Yin
Summary: A novel ratiometric luminescence thermometry strategy was proposed in this study, combining the thermally induced redshift of the charge transfer band with the dramatic quenching of the intervalent charge transition in Dy3+ and Pr3+ doped MNO phosphors. The emission color of the sample changes significantly with temperature, allowing for visual temperature sensing. The Dy3+ and Pr3+ activated MNO phosphors show excellent sensitivity, signal resolution, reversibility, and temperature resolution, making them promising for luminescence thermometry and safety markers.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Engineering, Environmental
Xuexue Wang, Lei Zhang, Kongyun Zhu, Changjing Li, Yulin Zhang, Aimin Li
Summary: The study utilized pressure-assisted sintering method to treat MSWI fly ash, producing high-strength ceramic products with compressive strength significantly higher than conventional construction materials, while heavy metals leaching concentrations were below the standard limit. Increased mechanical properties and decreased heavy metals leaching concentrations were mainly attributed to the increased density and crystalline degree.
Article
Engineering, Chemical
Daniele Sofia, Domenico Macri, Diego Barletta, Paola Lettieri, Massimo Poletto
Summary: This study examines the selective laser sintering of Titania powders to understand the impact of initial material properties and process conditions on the degree of sintering/melting and mechanical properties of the produced semi-3D artefact. Experimenting with different particle sizes, the research evaluates the effects of process variables such as laser power and scan speed on product properties, and uses measured tensile strength to estimate the size of sintered necks. Results are compared with values predicted by literature models to provide insights into the SLS process.
Article
Materials Science, Ceramics
Yu Zhang, Jianli Ma, Chang Li, Chen Chen, Yubin She
Summary: The study successfully obtained non-stoichiometric Li2Mg3Sn1-xO6 ceramics through reaction sintering process, and investigated their phase composition, morphology and dielectric characteristics. The XRD patterns and SEM images revealed that the samples were mainly composed of Li2Mg3SnO6 phase accompanied by Mg2SnO4 phase, and showed the presence of numerous pores and irregular grains. The porous morphology and presence of Mg2SnO4 significantly deteriorated the apparent density, relative permittivity, quality factor, and temperature coefficient of resonant frequency of the samples. Finally, Li2Mg3Sn0.92O6 ceramics with x=0.08 exhibited optimal dielectric performances: epsilon(r) = 9.133, Qxf = 55,429 GHz, tau(f) = -36.1 ppm/celsius.
JOURNAL OF ELECTROCERAMICS
(2023)
Article
Materials Science, Ceramics
Pei Zhang, Junzhuo Wang, Lianjun Wang, Jianlin Li, Wan Jiang
Summary: Dense tungsten carbide (WC) bulks with a density of 98.1% were successfully prepared by spark plasmas sintering via self-densification reaction of nanodiamond with tungsten at 1700 degrees C. This method has significant advantages over conventional methods and provides a new insight into the preparation of dense bulks of other metal carbides.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Thomas Herisson de Beauvoir, Claude Estournes
Summary: The Cold Sintering Process was used to promote in situ reactive sintering of hydroxide precursors Al(OH)3, xH2O. The result was dense translucent pellets containing a mix of amorphous and crystalline phases. Further heat treatment induced the transformation of boehmite into gamma-Al2O3, demonstrating the possibility of producing optically translucent ceramics with low temperature stability.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Jie Liu, Mingshun Zhou, Fadeng Wu, Hui Zhang, Libing Xu, Liwei Zhai, Wei Gao, Qiang Zhong
Summary: A new double-layer sintering process with stand-support (DLSP-S) is proposed to solve the problems in ultra-deep bed sintering. The results showed that the DLSP-S can significantly improve the yield, productivity, and bed permeability of sintering.
Article
Materials Science, Ceramics
Bing Liu, Ke Sha, Qin Wei Zhou, Kai Xin Song, Feng Shi, Yu Hua Cheng
Summary: BaF2 ceramics were prepared using a one-step cold sintering process. The relative density and microstructure improved with increasing pressure, achieving a fully densified microstructure at 900 MPa. The ceramics showed optimized optical, dielectric, and mechanical properties when cold sintered at 900 MPa.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Jiayu Zhang, Mingwei Yan, Guangchao Sun, Xiang Li, Kaiqi Liu
Summary: MgFe2O4 spinel is a photo-Fenton catalyst that can be used to degrade dyes in water under visible light, showing good visible light response and suitable band structure. By interacting with H2O2 to produce hydroxyl radicals, it achieves high degradation and removal efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
