Article
Materials Science, Ceramics
Daniel Tejero-Martin, Acacio Rincon Romero, Richard G. Wellman, Tanvir Hussain
Summary: Molten calcium magnesium alumina-silicates (CMAS) pose a challenge for rare earth silicates environmental barrier coatings (EBCs). The interaction between ytterbium disilicate (Yb2Si2O7) coatings and CMAS was studied, revealing that higher porosity levels facilitate CMAS infiltration and the formation of a fine porous network. Despite complete CMAS infiltration, no damage was observed, providing a promising direction for environmental barrier abradable coatings.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Jinping Du, Yanfei Wang, Fan Wan, Junsheng Li, Duan Li, Rongjun Liu
Summary: In this study, SiC particles and whiskers with various amounts were introduced to Yb2Si2O7, the mainstream EBC topcoat materials, to enhance their self-healing capability. The SiC inclusions in the presence of Yb2SiO5 triggered reactions that resulted in the formation of Yb2Si2O7, which increased silicon supplementation and enabled crack self-healing. This research provides insights for the design and development of more durable and robust EBCs with self-healing capability.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Haoyu Wang, Zhixin Luo, Luchao Sun, Jie Zhang, Jingyang Wang
Summary: CMAS deposits pose a significant threat to the service life of EBC. This study investigates the response of Yb2Si2O7 coatings with lamellar and quasi-columnar structures to CMAS attack. The dual-phase structure significantly enhances the apatite-forming capability and improves the coating's resistance to CMAS infiltration. The presence of amorphous silica in PS-PVD coatings hinders the formation of an apatite sealing layer.
Article
Materials Science, Ceramics
Guangheng Zhang, Jie Zhang, Jingyang Wang
Summary: The demand for more powerful aircraft has led to the development of ceramic matrix composites and environmental barrier coatings (EBC). A promising EBC material called ytterbium oxide (Yb2O3) was fabricated through hot pressing and its properties were systematically investigated. The evaluation of its thermal properties provides a baseline for its application on SiCf/SiC or Al2O3f/Al2O3 composites. The material exhibits excellent durability in harsh environments such as water vapor and molten calcium-magnesium-aluminosilicate (CMAS). The thermochemical interactions between ytterbium oxide and CMAS were found to be drastically different from rare-earth silicates due to the absence of silicon oxide. The reaction of ytterbium oxide with CMAS forms a variety of reaction products, including apatite, garnet, and silicocarnotite. The crystallization of garnet and silicocarnotite effectively consumes and solidifies the CMAS melt, preventing further corrosion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Andy Nieto, Richa Agrawal, Luis Bravo, Clara Hofmeister-Mock, Marc Pepi, Anindya Ghoshal
Summary: This review critically examines the current understanding of CMAS degradation mechanisms and mitigation approaches, emphasizing the importance of designing materials approaches to mitigate CMAS attack and presenting key future research areas for 'sandphobic' thermal and environmental barrier systems.
INTERNATIONAL MATERIALS REVIEWS
(2021)
Article
Materials Science, Coatings & Films
Daniel Tejero-Martin, Mingwen Bai, Acacio Rincon Romero, Richard G. Wellman, Tanvir Hussain
Summary: In this study, the interaction mechanism between high temperature steam and Yb2Si2O7 coatings was investigated and the degradation effect of high temperature steam on the coatings was revealed.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Luchao Sun, Xiaomin Ren, Yixiu Luo, Xirui Lv, Jiemin Wang, Yoonsuk Oh, Jingyang Wang
Summary: This study designed a material with excellent CMAS corrosion resistance and revealed the synergistic effects of rare earth elements in improving the corrosion resistance. The results demonstrated the importance of both inert and active elements in maintaining phase stability and reducing corrosion activity.
Article
Materials Science, Ceramics
Xuan Chen, Yang Li, Wei Zhou, Peng Xiao, Pengju Chen, Yonggang Tong, Maolin Chen
Summary: Experimental investigations were conducted on the corrosion reaction between Yb2Si2O7 pellet and CFAS at 1400 degrees C, revealing the formation of apatite layer. The infiltration depth of CFAS melt increased with time, while the thickness of apatite layer reached a plateau after 30 hours of exposure.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Pingping Liu, Xin Zhong, Yaran Niu, Liping Huang, Hong Li, Dong Fan, Qilian Li, Xuebin Zheng, Jinliang Sun
Summary: This study investigated the reaction behaviors and corrosion mechanisms of tri-layer Yb2SiO5/Yb2Si2O7/Si EBCs against CMAS melts at high temperatures. The results showed that the reaction temperature had a significant impact on the corrosion behaviors of the EBCs, with the Yb2SiO5 top layer exhibiting better corrosion resistance.
Article
Materials Science, Multidisciplinary
Xin Zhong, Yawen Wang, Yaran Niu, Liping Huang, Qilian Li, Xuebin Zheng
Summary: The study revealed that Yb2O3-rich coatings are beneficial in forming dense apatite layers in CMAS melts, while Yb2Si2O7-rich coatings showed accelerated recession due to an increased fraction of CMAS melts within the reaction layer.
Review
Materials Science, Ceramics
Daniel Tejero-Martin, Chris Bennett, Tanvir Hussain
Summary: This review presents the degradation mechanisms of SiC/SiC ceramic matrix composites in harsh environments, the role of environmental barrier coatings, and outlines the latest research directions for potential next-generation EBCs.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Xiaotong Guo, Yulei Zhang, Tao Li, Pengfei Zhang, Kang Shuai, Jie Li, Xiaohong Shi
Summary: A new high-entropy ceramic (5RE(0.2))(2)Si2O7 was proposed as a potential environmental barrier coating material for ceramics matrix composites. The (5RE(0.2))(2)Si2O7 showed good phase stability, low coefficient of thermal expansion and thermal conductivity, and exhibited better water vapor corrosion resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Ahmet Hilmi Paksoy, Ping Xiao
Summary: In this study, the sintering behaviors of Yb2Si2O7 (YbDS), Yb2SiO5 (YbMS), and YbDS/YbMS composite compacts were investigated. The effects of thermal aging on microstructural characteristics, crack healing, and elastic properties were examined. The results showed that the addition of YbMS retarded grain growth rates and contributed to the stabilization of elastic properties. Furthermore, a composite containing 22 wt% YbMS displayed crack healing behavior during high-temperature exposure.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Mohammad Jafari Eskandari, Meysam Karimi, Masoud Araghchi, Ali Hadipour
Summary: This study investigated the effectiveness of laser cleaning in removing contaminants from the surface of a turbine blade. Various tests and analyses were conducted, and the optimal parameters for the laser cleaning process were determined. The results demonstrated that this method can completely eliminate targeted contaminants.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Hao Li, Yiping Yu, Bing Fang, Peng Xiao, Wei Li, Song Wang
Summary: In this study, the corrosion resistance of HfSiO4 in different corrosive mediums was evaluated. It was found that HfSiO4 showed poor resistance to CMAS attack and decomposed in high-velocity water vapor. Therefore, HfSiO4 is not suitable as the surface layer of an EBC system but can be used as an intermediate transition layer.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
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)