Article
Engineering, Mechanical
Markus Varga, Reinhard Grundtner, Matthias Maj, Fabio Tatzgern, Karl-Otto Alessio
Summary: In this study, various commercial alumina ceramics and more expensive Zirconia Toughened Alumina (ZTA) were tested for their wear resistance under impact load conditions. It was found that different ceramic materials exhibited different wear behaviors. High alumina content and 25% ZTA showed the best wear resistance.
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaohong Xu, Guobin Xie, Jianfeng Wu, Peng Wei, Zhichao Chen, Sitong Ma
Summary: This paper investigates the phase composition, microstructure, and properties of La2O3 doped zirconia-alumina composite ceramics. It is found that La2O3 can lower the sintering temperature and enhance the bending strength and fracture toughness of the samples. The composite ceramics with 1.5 wt% La2O3 sintered at 1480 degrees C exhibit a bending strength of 299.17 MPa and a fracture toughness of 5.61 MPa m1/2. After 30 thermal shocks, the phase composition and microstructure of the sample remain unchanged, indicating excellent thermal shock resistance of the composite ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yongxin Jian, Hongjun Qi, Zhifu Huang, Jian Wang, Hanbing Kong, Jiandong Xing
Summary: In this study, silicon-doped MoAlB ceramic bulk with superior hardness, strength, and toughness was successfully fabricated. The enhancement of comprehensive properties in MoAlB bulk was attributed to silicon doping, grain refinement, strengthening effect of ultrafine Al2O3, and phase transformation from Al8Mo3 to Mo(Al, Si)2.
CERAMICS INTERNATIONAL
(2022)
Review
Materials Science, Multidisciplinary
Zhwan Dilshad Ibrahim Sktani, Ali Arab, Julie Juliewatty Mohamed, Zainal Arifin Ahmad
Summary: This study reviews the development of ZTA ceramics and verifies the effects of adding various additives and controlling the microstructure pattern on their mechanical properties. It identifies important parameters that affect the mechanical properties of ZTA and suggests approaches to enhance its performance.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Dentistry, Oral Surgery & Medicine
Alper Ozdogan, Hatice Ozdemir
Summary: Repeated firing can have a negative impact on the mechanical properties of lithium disilicate glass-ceramics, particularly on surface hardness and fracture toughness.
JOURNAL OF PROSTHETIC DENTISTRY
(2021)
Article
Materials Science, Ceramics
Jeffrey J. Swab, Jecee Jarman, William Fahrenholtz, Jeremy Watts
Summary: This study compares the mechanical properties of zirconium diboride (ZrB2) measured at two different laboratories. The results show that the properties can be directly compared when using the same testing methods, and the strength and fracture toughness of samples prepared by different machining methods are almost identical.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Applied
Zhwan Dilshad Ibrahim Sktani, Nik Akmar Rejab, Abdul Fatah Zulkarnain Rosli, Ali Arab, Zainal Arifin Ahmad
Summary: The study investigated the influence of La2O3 inclusion on the microstructure and mechanical properties of ZTA-CeO2, revealing that the addition of La2O3 can increase hardness and fracture toughness, but excessive addition can lead to a decrease in performance.
JOURNAL OF RARE EARTHS
(2021)
Article
Materials Science, Ceramics
Seema Patil, Deepak Rajaram Patil, In Chul Jung, Jungho Ryu
Summary: This study systematically investigated the effect of cooling rates on the microstructural evolution and residual stress of ATZ composites after sintering. The results showed that the ATZ composite with a cooling rate of -1 degrees C/min exhibited the highest fracture toughness and the lowest tensile residual stress.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Shoulong Lai, Jinhao Zang, Weixia Shen, Guofeng Huang, Chao Fang, Yuewen Zhang, Liangchao Chen, Qianqian Wang, Biao Wan, Xiaopeng Jia, Zhuangfei Zhang
Summary: The B4C-diamond composite with high hardness and toughness was prepared through high-pressure sintering of B4C and diamond powders. The diamond fraction had a significant effect on the densification, microstructure, and mechanical properties of the composite. The addition of 40 vol% diamond resulted in excellent comprehensive mechanical properties, including high relative density, density, Vickers hardness, and fracture toughness. The use of superhard diamond improved the fracture toughness of lightweight B4C while maintaining its high hardness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Qiang Wang, Cunlong Zhou, Chao Yang
Summary: The introduction of a reinforced phase is an effective way to toughen silicon nitride ceramics. However, the residual stress caused by thermal expansion mismatch may generate interfacial defects and deteriorate the strength. A novel strategy for optimizing interface structure has been proposed to reinforce W/Si3N4 composite ceramics. By introducing (Y2O3, Al2O3, W) particles, a core-shell structural W-crystallized oxynitride phase is in situ-generated, inhibiting interfacial defects and improving the flexural strength and fracture toughness of the ceramics.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
M. Imariouane, M. Saadaoui, G. Denis, H. Reveron, J. Chevalier
Summary: This study investigates the mechanical behavior of a zirconia ceramic with 1.5 mol% yttria dopant, developed by Tosoh (Japan). The results demonstrate that this ceramic exhibits a balanced combination of strength (1 GPa) and toughness (8.5 MPa root m) due to the crack shielding effect of the phase transformation toughening mechanism. It also shows a high Weibull modulus (16) and crack growth resistance. Moreover, phase transformation occurs during impact testing, indicating good impact resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Physics, Multidisciplinary
Jingzhe Fan, Weixia Shen, Zhuangfei Zhang, Chao Fang, Yuewen Zhang, Liangchao Chen, Qianqian Wang, Biao Wan, Xiaopeng Jia
Summary: In this study, a series of B4C-TiB2 composite ceramics were prepared by doping TiH2 into B4C and sintering through SPS. The effects of sintering temperature and TiH2 content on the properties of the ceramics were investigated. Results showed that increasing TiH2 content improved the conductivity and toughness of the composite ceramics.
Article
Materials Science, Ceramics
Hamisah Ismail, Hasmaliza Mohamad
Summary: This study investigated the effects of CaCO3 additive on zirconia-toughened alumina-CeO2-Nb2O5 ceramics, and found that adding 1.0 wt% CaCO3 resulted in excellent Vickers hardness and fracture toughness.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Pei-Hu Gao, Sheng-Cong Zeng, Can Jin, Bo Zhang, Bai-Yang Chen, Zhong Yang, Yong-Chun Guo, Min-Xian Liang, Jian-Ping Li, Quan-Ping Li, Yong-Qing Lu, Lu Jia, Dan Zhao
Summary: The addition of Gd2O3 into ZrO2 was found to enhance the hardness, elastic modulus and fracture toughness of the composite ceramics, while decreasing the thermal conductivity and thermal expansion coefficient.
Article
Green & Sustainable Science & Technology
Nuno P. F. Goncalves, Susana M. Olhero, Joao A. Labrincha, Rui M. Novais
Summary: This study presents a new management strategy for bauxite residue or red mud (RM), a hazardous waste derived from the alumina industry. Porous structures containing RM were prepared for the extraction of methylene blue (MB) from synthetic wastewater. The structures exhibited high compressive strength, high open porosity, large specific surface area, and excellent stability. Batch adsorption tests showed that the RM/MK-based structures had a high MB uptake, ranking them among the best performing geopolymer adsorbents. Furthermore, the structures were successfully regenerated and reused without compromising their performance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Materials Science, Multidisciplinary
Tania S. S. Carvalho, Nilza Ribeiro, Paula M. C. Torres, Jose C. Almeida, Joao H. Belo, J. P. Araujo, Antonio Ramos, Monica Oliveira, Susana M. Olhero
Summary: This study aims to enhance the magnetic susceptibility of PLA-based biocomposites by incorporating 5 wt% of iron doped biphasic calcium phosphate (FeBCP) powders into the PLA matrix, avoiding the use of magnetic nanoparticles with unclear long-term side effects. The FeBCP composites showed ferromagnetic-like behavior, superior tensile strength, and cytocompatibility compared to PLA or non-doped composites. This proof of concept opens up possibilities for future development of biomedical applications utilizing magnetic PLA-based biocomposites.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Liviu Nedelcu, Jose M. F. Ferreira, Adrian-Claudiu Popa, Luminita Amarande, Bo Nan, Liliana-Marinela Balescu, Cezar Dragos Geambasu, Marius-Cristian Cioangher, Lucia Leonat, Mihai Grigoroscuta, Daniel Cristea, Hermine Stroescu, Robert Catalin Ciocoiu, George E. Stan
Summary: This study conducted a comparative analysis of various sintered piezoceramic materials using multi-parametric unitary methods. The aim was to identify the most promising biocompatible piezoelectric material for use in 3D printed macro-porous ceramic scaffolds. The results showed that the BCTZ solid solution had the best combination of functional properties and compatibility with osteoblast cell cultures. Using the selected piezoceramic as a base material, 3D macro-porous scaffolds with promising compressive strength and excellent cell colonization capability were fabricated.
Review
Architecture
Joao Teixeira, Cecilia Ogliari Schaefer, Barbara Rangel, Lino Maia, Jorge Lino Alves
Summary: Recent years have witnessed the rapid adoption of digital manufacturing techniques in the construction industry, particularly additive manufacturing. Despite the notable advancements in 3D printing for construction (3DPC), publications on the subject have only recently grown, indicating its promising potential in terms of efficiency, waste reduction, and industrialization of the construction process. This new building system not only optimizes the building process but also revolutionizes the approach to building design materiality, offering a wider range of customization options, cost and time reduction, and improved sustainability through the use of alternative materials.
FRONTIERS OF ARCHITECTURAL RESEARCH
(2023)
Article
Education, Scientific Disciplines
Jorge Lino Alves, Teresa Duarte
Summary: Teaching in higher education is challenging due to students' easy access to information and lack of surprise. Mechanical Engineering professors need to transmit general competencies, scientific knowledge, and develop skills useful in future employment. Teachers must innovate and adopt new teaching methodologies to motivate and engage students, such as active learning.
INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING EDUCATION
(2023)
Article
Materials Science, Ceramics
M. S. Faria, M. F. R. P. Alves, R. Cintra, F. J. Oliveira, C. M. Fernandes, D. Figueiredo, S. M. Olhero
Summary: The conventional methods face challenges in fabricating complex shaped Si3N4 parts due to their high hardness and mechanical strength. Additive manufacturing (AM) has emerged as a competitive and cost-effective approach to achieve three-dimensional complexity. However, limitations in producing high dense ceramics still exist in most AM technologies, mainly attributed to difficulties in developing suitable feedstock. This study demonstrates the fabrication of dense silicon nitride-based ceramics using an extrusion based additive manufacturing technique (direct ink writing, or robocasting) and cold isostatic pressing (CIP) as a post processing step. The use of CIP helps in reducing or eliminating defects and porosity, leading to improved mechanical performance of the final parts. The relative density, microhardness, and flexural strength of the parts increase with higher solids loading in the inks and are further enhanced by CIP pressing. Parts produced by robocasting with 39 vol% ink and cold isostatic pressed at 200 MPa exhibit comparable properties to conventionally processed silicon nitride ceramics, with an average relative density of around 99%, a microhardness value of 1475 HV2, and a flexural strength of 650 MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Henrique Takashi Idogava, Daniel Marcos Souza do Couto, Leonardo Santana, Jorge Lino Alves, Zilda Castro Silveira
Summary: This paper introduces the development and implementation of AltPrint, a slicing algorithm based on a new filling process planning that enables changes in the extruded material flow toward local variations in stiffness. The technical feasibility was evaluated experimentally using the fused filament fabrication (FFF) process. AltPrint integrates variable fill width with slicing software to vary print parameters in different regions of an object. It provides deposited variable-width segments in an organized and replicable filling strategy, resulting in mechanical properties variations in specific regions of a part. The potential of AltPrint for manufacturing functional parts with local flexibilities was demonstrated through fabrication and experimental evaluations in the field of additive manufacturing.
RAPID PROTOTYPING JOURNAL
(2023)
Article
Engineering, Manufacturing
Natacha Rosa, Maria Vila Pouca, P. M. C. Torres, Susana M. Olhero, Renato Natal Jorge, Marco Parente
Summary: This paper presents a methodology to predict the potential behavior of bioceramic-based composite scaffolds for bone engineering applications. The results show that scaffolds with a regular structure and 500μm filament distance or irregular architecture demonstrate better performance in cell adhesion and migration, nutrient and oxygen flow, vascularization, mechanical capacity, and initial bone formation.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Review
Construction & Building Technology
Manuel Jesus, Ana Sofia Guimaraes, Barbara Rangel, Jorge Lino Alves
Summary: This paper aims to bridge the benefits of 3D printing with the rehabilitation of cultural heritage buildings. It discusses the potential of using 3D printing and scanning techniques in the rehabilitation process, as well as the challenges and opportunities associated with this application. The paper also emphasizes the importance of developing compatible materials and extruders, and the integration of 3D printers with mapping tools for accurate reproduction of components.
INTERNATIONAL JOURNAL OF BUILDING PATHOLOGY AND ADAPTATION
(2023)
Article
Biotechnology & Applied Microbiology
Ana Pais, Jorge Lino Alves, Renato Natal Jorge, Jorge Belinha
Summary: In this study, the elastic and plastic properties of two TPMS-based cellular structures (gyroid and primitive surface) were analyzed using numerical homogenization. Material laws for the homogenized Young's modulus and yield stress were developed and found to be consistent with experimental data. The developed material laws can be used to optimize functionally graded structures for various applications. A case study on an optimized femoral stem showed that a porous stem made of Ti-6Al-4V can minimize stress shielding while maintaining load-bearing capacity. Additionally, the stiffness of the cementless femoral stem implant with graded gyroid foam was comparable to trabecular bone, with lower maximum stress.
BIOENGINEERING-BASEL
(2023)
Review
Chemistry, Physical
A. I. Pais, J. Belinha, J. L. Alves
Summary: Cellular materials have diverse applications in areas such as structural optimization and biomedical applications. Their porous structure promotes cell adhesion and proliferation, making them well-suited for tissue engineering and biomechanical applications. They can also effectively adjust mechanical properties, which is crucial in designing implants that require low stiffness and high strength to prevent stress shielding and promote bone growth. This paper provides a state-of-the-art review of various techniques, including artificial intelligence and functional gradients, in orthopedic biomechanics research for implant and scaffold design.
Review
Engineering, Biomedical
Tania S. S. Carvalho, Paula M. C. Torres, Joao H. Belo, Joao Mano, Susana M. Olhero
Summary: The review discusses the versatile applications of nanoparticles, especially magnetic nanoparticles, in various industrial sectors. It provides a brief overview of their magnetic behavior and synthesis methods. The focus is on the applications of magnetic nanoparticles in tissue engineering, with a specific emphasis on calcium phosphate-based nanoparticles for bone regeneration. The review also discusses the influence of magnetic field parameters on the biological behavior of magnetic materials and presents the current state of the art in the development of magnetic biomaterials for additive manufacturing in bone tissue engineering.
ADVANCED NANOBIOMED RESEARCH
(2023)
Article
Biophysics
Ana Pais, Jorge Lino Alves, Jorge Belinha
Summary: This study demonstrates that machine learning can accurately simulate bone remodelling phenomenon in a fraction of the time required by the finite element method, leading to significant savings in computational time.
JOURNAL OF BIOMECHANICS
(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)
