Article
Materials Science, Ceramics
Meng Li, Manfeng Gong, Zanlin Cheng, Deyun Mo, Lei Wang, Jan Dusza, Chengyu Zhang
Summary: WC-Co-Ti3SiC2 cemented carbides with different fractions of Ti3SiC2 were successfully prepared and characterized in this study. The addition of Ti3SiC2 resulted in refined WC grains in the composites, and the refinement was achieved by the decomposition of Ti3SiC2. The optimal composition of 3.0 wt% Ti3SiC2 exhibited excellent hardness and indentation fracture toughness values.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Shuai Liu, Hao Lu, Chao Liu, Xuemei Liu, Haibin Wang, Xiaoyan Song
Summary: In this study, CaF2 was introduced into WC-Co to prepare bulk self-lubricating cemented carbides by sinter-HIP. The addition of CaF2 improved the tribological behaviors of the cemented carbides, reducing friction coefficient and wear loss during dry sliding. However, CaF2 did not significantly enhance the mechanical properties of the cemented carbides.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Boris B. Straumal, Lev N. Shchur, David G. Kagramanyan, Elizaveta P. Konstantinova, Alexander V. Druzhinin, Alexei N. Nekrasov
Summary: This paper uses machine vision methods to obtain statistical data on the topology of the interfaces between tungsten carbide grains (WC) and a cobalt matrix (Co) in WC-Co cemented carbides. The outlines of the cobalt binder were chosen to describe the structure of cemented carbides for the first time. Statistical data on the shape of cobalt areas and their possible connection with crack trajectories in cemented carbides are discussed.
Article
Materials Science, Ceramics
Xiaoyuan Ye, Congying Xiang, Hongbo Nie, Huasheng Lei, Yong Du, Wandong Xing, Jian Luo, Zhiyang Yu
Summary: Aberration-corrected scanning transmission electron microscopy was used to study the atomic-level segregation mechanism in V-doped WC-Co composites. It was found that the segregation behavior largely depends on the orientation of low-index planes, particularly the basal and prismatic facets in WC-Co. V solute atoms show weak segregation at the WC prismatic plane-terminated interfaces, mainly occurring within a monolayer. In contrast, segregation at the basal facets of WC grains distributes within a bilayer with a higher concentration.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Kai-Hua Shi, Ke-Chao Zhou, Zhi-You Li, Xiu-Qi Zan, Kai-Lin Dong, Qing Jiang
Summary: This study systematically investigated the effects of Co content on the microstructure, physical, and mechanical properties of ultrafine WC-Co-VC cemented carbides. The results showed that increasing Co content resulted in increased cobalt magnetism and bending strength, while decreased coercive force, Rockwell hardness, density, and abrasive wear resistance. Furthermore, the increase in Co content led to a decrease in the quantity and size of micro-pores and a transition from brittle fracture to ductile fracture.
Article
Materials Science, Multidisciplinary
Tao Lin, Qianghua Li, Yu Han, Ke Song, Xueting Wang, Huiping Shao, Jianhui Dong, Hao Wang, Xin Deng
Summary: Cemented carbides (WC-Co-Ni) with the addition of Nb and NbC were prepared by powder metallurgy method. The microstructure and mechanical properties were analyzed. The results showed that the addition of Nb or NbC can reduce the grain size of WC. Nb has a stronger inhibitory effect on WC grain growth than NbC. The transverse fracture strength of the samples first increased and then decreased with the increase of Nb and NbC contents. The hardness of cemented carbides increased with the content of additives. The fracture toughness and impact toughness decreased with the increase of NbC and Nb contents.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Nadia Alves Nery Balbino, Edmilson Otoni Correa, Danilo Roque Huanca, Flavio Amaury de Freitas Matos, Livio de Carvalho Valeriano
Summary: This study investigated the influence of nickel binder metal and molybdenum carbide as additional alloying elements on the microstructure and corrosion behavior of WC-based cemented carbides. Comparison with conventional WC-Co cemented carbide was conducted. Various analysis techniques were used to characterize the sintered alloys, before and after corrosive tests. The results showed that the WC-NiMo cemented carbide exhibited similar microstructures to WC-Co, but with observed pores and binder islands. The corrosion tests demonstrated superior corrosion resistance and higher passivation capacity in the WC-NiMo cemented carbide compared to WC-Co, as evidenced by various electrochemical measurements.
Article
Materials Science, Multidisciplinary
Xian Wu, Jianyun Shen, Feng Jiang, Hairong Wu, Liang Li
Summary: This paper investigates the oxidation of WC-Co cemented carbide under both isothermally and laser irradiation conditions, and reveals that the microstructures of oxide layer in laser-induced oxidation are very different to isothermal oxidation. The oxide layer in laser-induced oxidation shows more porous structures and a mountain shape due to the Gaussian profile of pulsed laser beam. The oxygen content curve in laser-induced oxidation increases rapidly at the beginning and then stabilizes with increasing laser power.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yingbiao Peng, Tao Li, Jianzhan Long, Haohan Li, Bizhi Lu, Fei Chen, Yong Du
Summary: This study found that increasing the proportion of Ni3Al in the Co-Ni3Al composite binder phase significantly increases the solid-liquid interfacial energy, providing a higher driving force for abnormal grain growth (AGG) of WC, but also raises the energy barrier for the migration of W and C atoms into the liquid binder phase, ultimately inhibiting the AGG of WC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Review
Engineering, Manufacturing
Cai Chen, Boyun Huang, Zuming Liu, Yongxia Li, Dan Zou, Tao Liu, Yiming Chang, Lei Chen
Summary: In this paper, the progress of additive manufacturing (AM) technology in WC-Co cemented carbides is reviewed. The two technology routes for AM of WC-Co cemented carbides, powder bed fusion (PBF) and forming-debinding-sintering (FDS), are introduced. The key influencing factors in preparation and the current research gaps and prospects of WC-Co cemented carbides using AM are analyzed.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Rui-Jun Cao, Chen-Guang Lin, Xing-Cheng Xie, Zhong-Kun Lin
Summary: Adding fine WC powder is an effective method to improve the wear resistance of coarse-grained WC-Co cemented carbides. The addition of fine WC powder decreases WC size, mean free path, and fracture toughness while increasing hardness. The bimodal distribution cemented carbides exhibit better combination of hardness and impact-abrasive wear resistance compared to the unimodal ones.
Article
Materials Science, Ceramics
Ehsan Ghasali, Asghar Shahmorad, Yasin Orooji, Arash Faraji, Keivan Asadian, Masoud Alizadeh, Touradj Ebadzadeh
Summary: WC-Co cermets containing Ti and V metallic powders were prepared using ultra-fast microwave heating process, followed by high-energy mixer mill mixing. Fast microwave sintering process at temperatures of 1400, 1500, and 1600°C resulted in dense samples with improved properties, showing WC, TiC, and VC crystalline phases. Increased sintering temperature led to enhanced bending strength, hardness, and fracture toughness in WC-Co-Ti hard metal.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Lucas Degeneve, Samy Adjam, Daniele Mari
Summary: Cemented carbides, consisting of hard tungsten carbide grains and a ductile cobalt binder, are widely used in the cutting tools industry for their excellent mechanical properties. Understanding the evolution of the microstructure of the two phases is essential for their extreme conditions of use. Mechanical Spectroscopy reveals three mechanical loss peaks in the spectrum, with the second peak showing a transition in its Arrhenius plot at 1140 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Hong Zhang, Ji Xiong, Zhixing Guo, Tianen Yang, Junbo Liu, Tao Hua
Summary: The addition of Ru to WC-8Co cemented carbide enhances its mechanical properties and cutting performance, leading to improved hardness, transverse rupture strength, fracture toughness, and wear resistance. The increase in HCP Co phases with Ru content is key to these improvements.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yang Gao, Shengqiang Deng, Xiaoting Li, Dejian Sun, Ka Gao, Linan An
Summary: A novel oscillating sinter forging (OSF) method was used to prepare ultrafine WC-Co cemented carbides for the first time. The resulting samples showed higher hardness and fracture toughness compared to samples prepared by conventional sinter-forging (CSF) method. Microstructural analysis indicated that OSF samples had better microstructure, including higher relative density, finer grains, more uniform microstructure, more fcc-structured Co phase, and more Sigma 2 low-energy grain boundaries. The study suggests that OSF has excellent synergistic hardening and toughening effects, making it a promising technique for high-performance cemented carbides.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mauro Andres Cerra Florez, Gemma Fargas Ribas, Joan Josep Roa Rovira, Antonio Manuel Mateo Garcia, Stephany Aparecida Santos da Mata, Enrique Rodriguez-Castellon, Marcelo Jose Gomes da Silva
Summary: An experimental procedure was developed to form an oxide layer mainly composed of spinel on maraging steels. Tests and characterization techniques showed that the oxide layer consists of Fe3O4 and CoFe2O4 spinel, with no hematite formation. The heat treatment conditions induced the formation of a mixture of iron, nickel, and cobalt spinel ferrites, contradicting previous studies. Sliding tests revealed that the oxide layer on maraging 300 grade has better adhesion.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Junhui Zhang, Maziar Ahmadi, Gemma Fargas, Nikola Perinka, Javier Reguera, Senentxu Lanceros-Mendez, Luis Llanes, Emilio Jimenez-Pique
Summary: Silver nanoparticles have excellent properties for applications in photonics, electrics, analytical, and antimicrobial/biocidal fields. This review discusses the synthesis methods of silver nanoparticles and their application under the electrical field. It also presents the formulation of silver inks and the formation of conductive patterns using various printing techniques. Post-printing treatments are discussed, and outlooks and perspectives are provided.
Article
Engineering, Mechanical
V. Collado Cipres, E. L. Dalibon, J. Garcia, L. Escalada, J. J. Roa, E. Jimenez-Pique, F. Soldera, S. P. Bruehl, S. Simison, L. Llanes, A. D. Sosa
Summary: Cycling contact fatigue indentation tests were conducted on cemented carbides coated with Ti(C,N)/alpha-Al2O3 and Zr(C,N)/alpha-Al2O3 systems under both dry and wet conditions. The results showed that under dry conditions, there was still coating deformation present in all imprints after the test, while under wet conditions, almost all imprints had the alpha-Al2O3 coating removed due to corrosion-fatigue. However, for Cr-containing cemented carbides combined with Zr(C,N)/alpha-Al2O3 coating, no delamination of alpha-Al2O3 was observed after the wet test, suggesting that this combination may have an advantage in resisting degradation by cyclic contact fatigue.
Article
Materials Science, Ceramics
Junhui Zhang, Maziar Ahmadi, Marc Serra, Emilio Jimenez-Pique, Luis Llanes, Gemma Fargas
Summary: There is a growing interest in zirconia ceramics due to their high flexural strength, excellent corrosion resistance, and good biocompatibility. The assembly of advanced zirconia material with functions of sensing, actuation, and controlling is critical to ensure long-term service and performance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Rezayat, Amirhossein Aboutorabi Sani, Mohammad Talafi Noghani, Morteza Saghafi Yazdi, Morteza Taheri, Amirhossein Moghanian, Mohammad Abedini Mohammadi, Mahmoud Moradi, Antonio Manuel Mateo Garcia, Hossein Besharatloo
Summary: The aim of this study was to evaluate the corrosion properties of different samples coated by the laser-cladding method and find the optimal laser parameters. Potentiodynamic polarization (Tafel) and electrochemical impedance tests were performed to assess the corrosion resistance. Scanning electron microscopy was used to inspect the corrosion morphology of the tested samples. The results showed a direct correlation between laser power and pitting corrosion on the surface of the samples. Additionally, an increase in molybdenum and chromium ions in the electrolyte solution led to more durable passive and protective layers, as the ions filled the holes and defects, reducing the surface corrosion rate.
Article
Materials Science, Multidisciplinary
Sergi Parareda, David Frometa, Daniel Casellas, Henrik Sieurin, Antonio Mateo
Summary: This study introduces an innovative approach for selecting high-strength materials for fatigue dimensioning parts by considering fracture toughness and fatigue performance. Warm and hot forming processes enable the construction of high-strength parts with complex geometries, making them suitable for lightweight chassis in automotive and freight applications. The research shows that high-strength steels may experience a significant reduction in fatigue performance due to manufacturing defects, but fracture toughness can serve as an indicator of notch sensitivity with a strong correlation between fracture toughness and fatigue notch sensitivity. By combining fracture toughness measurements and fatigue resistance tests, the most fatigue-resistant materials can be quickly identified. Among the nine materials analyzed, warm-formed steels demonstrate promising characteristics for lightweight chassis construction with high fatigue resistance and fracture toughness exceeding the proposed fracture threshold of 250 kJ/m(2).
Article
Materials Science, Ceramics
Jing Liang, Marc Serra, Sandra Gordon, Jonathan Fernandez de Ara, Eluxka Almandoz, Luis Llanes, Emilio Jimenez-Pique
Summary: The objective of this study is to explore and compare the mechanical response of AlCrSiN coatings deposited on two different substrates, namely, WC-Co and cBN. The AlCrSiN coating deposited on the WC-Co substrate performed better in terms of adhesion strength and contact damage response than the same coating deposited on the cBN substrate due to the lower plasticity of the cBN substrate and its weaker adhesion to the coating.
CERAMICS-SWITZERLAND
(2023)
Article
Materials Science, Ceramics
Andrea Bartoletti, Alex Sangiorgi, Angela Gondolini, Elisa Mercadelli, Simone Casadio, Sandra Garcia-Gonzalez, Miguel Morales, Emilio Jimenez-Pique, Alessandra Sanson
Summary: Proton-conducting ceramic membranes with asymmetric configuration have been increasingly studied due to their 100% H2 selectivity, high thermo-chemical stability, and lower cost compared to Pd-based membranes. In this study, porous BaCe0.65Zr0.20Y0.15O3-delta (BCZY) supports were fabricated for the first time using UV-assisted micro-extrusion. Different preparation methods of BCZY-based inks were evaluated to obtain eco-friendly formulations with high solid loading (>40 vol%). Printable inks with optimal shear thinning behavior were successfully extruded, allowing for deposition of up to three stacked layers without defects.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Mohammad Rezayat, Mojtaba Karamimoghadam, Mahmoud Moradi, Giuseppe Casalino, Joan Josep Roa Rovira, Antonio Mateo
Summary: This paper provides a review of various surface treatment methodologies, especially laser treatments, used to improve the mechanical properties of metastable austenitic stainless steels (MASS). The effects of these treatments on the microstructure and chemical composition in the thermal affected zone of MASS are discussed, and their impact on the material's mechanical properties is investigated in detail. The limitations of these treatments are highlighted, and areas for further research are identified. The findings can be used to guide the selection of appropriate surface treatment techniques, ultimately improving the performance and lifespan of MASS in industrial applications.
Article
Crystallography
Miguel Morales, Sandra Garcia-Gonzalez, Michaela Plch, Dario Montinaro, Emilio Jimenez-Pique
Summary: Laser machining of NiO-YSZ composite in SOFCs can enlarge the electrode-electrolyte interface and improve cell performance, but it can also cause thermal damage. This study evaluated the microstructure changes and collateral damage caused by laser machining on sintered NiO-YSZ. By varying laser parameters, laser patterns were processed on sintered NiO-YSZ, revealing a limited heat-affected zone with microcracking, porosity reduction, and recrystallization. Chemical composition, phase transformation, and mechanical properties changes were minimal at the machined surface.
Article
Nanoscience & Nanotechnology
Samuele Colombi, Lorena P. Macor, Laia Ortiz-Membrado, Soledad Perez-Amodio, Emilio Jimenez-Pique, Elisabeth Engel, Maria M. Perez-Madrigal, Jose Garcia-Torres, Carlos Aleman
Summary: This study developed two polymeric platforms for sustained release of lactate, which are important in cardiac tissue regeneration. The optimized platform achieved a constant release of lactate at a rate of 5.9 +/- 2.7 mM per day over 11 days, fully satisfying the requirements for heart tissue regeneration.
ACS APPLIED BIO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mahmoud Moradi, Mohammad Rezayat, Saleh Meiabadi, Mojtaba Karamimoghadam, Stephen Hillyard, Antonio Mateo, Giuseppe Casalino, Zammad Tanveer, Muhammad Adnan Manzoor, Muhammad Asad Iqbal, Omid Razmkhah, Antonio Miotello
Summary: This research used Design of Experiments (DOE) and Response Surface Methodology (RSM) to investigate the relationship between input process parameters and kerf quality in laser cutting of PMMA. It found that high laser power, cutting speed, and focal plane position have significant effects on kerf quality. The optimization method identified optimal parameter combinations and validated the models for practical applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Fluids & Plasmas
Morteza Saghafi Yazdi, Mohammad Rezayat, Joan Josep Roa Rovira
Summary: In this study, nickel foam activated by cobalt, molybdenum, and nickel phosphide nanostructures was prepared using the plasma hydrothermal method. The synthesized phosphide specimens were characterized for morphology, crystallographic structure, and electrocatalytic activity. Preliminary results showed that nickel phosphide exhibited the highest electrocatalytic activity among the other phosphides studied.
Article
Materials Science, Multidisciplinary
Mauro Andres Cerra Florez, Gemma Fargas Ribas, Joan Josep Roa Rovira, Antonio Manuel Mateo Garcia, Marcos Natan da Silva Lima, Guiomar Riu Perdrix, Jorge Luiz Cardoso, Marcelo Jose Gomes da Silva
Summary: The growing process of a spinel-like oxide film can be influenced by different atmospheres. The oxidation layer formed under different atmospheres was characterized chemically, microstructurally, and mechanically. The results showed a non-homogeneous mix oxide with uneven thickness. TiO2 was found in the inner areas and a significant amount of hematite on the external surface. A nickel-rich austenite phase was produced, with the highest thickness observed in maraging 300 steel. The oxide films produced in both alloys using air atmosphere exhibited excellent adherence and can be used for tribological applications.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2022)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
