Article
Nanoscience & Nanotechnology
Shipra Bajpai, Alok Bhadauria, T. Venkateswaran, Sudhanshu S. Singh, Kantesh Balani
Summary: The study employed spark plasma sintering to join two pre-sintered HfB2-ZrB2 and HfB2-ZrB2-SiC composites using Ni powders as an interlayer. Solid-state diffusion of Ni into UHTCs resulted in the formation of continuous and crack-free interfaces. While the HZ/Ni/HZ joint exhibited reduced hardness due to microstructural inhomogeneity, the HZS/Ni/HZS joint achieved uniform hardness owing to microstructural homogeneity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
V. S. Buinevich, A. A. Nepapushev, D. O. Moskovskikh, K. Kuskov, S. N. Yudin, A. S. Mukasyan
Summary: Dense single-phase (Ta,Hf)CN ceramics were fabricated using a combination of combustion synthesis and spark plasma sintering, with Ta25Hf75CN exhibiting the highest hardness and fracture toughness, along with excellent oxidation resistance in air.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xinyu Yang, Ke Wang, Cunchao Dong, Hefa Cheng, Cunliu Han, Shifeng Luo, Jiuxing Zhang
Summary: Ultra-high temperature HfB2 ceramic with nearly full densification is achieved by gradient sintering process of SPS without any additives. The highest relative density of 96.75% is obtained at T =1950 degrees C, P = 60 MPa and t =10min. The HfB2 ceramic obtained at T =1950 degrees C exhibits the highest hardness of 26.34 +/- 2.1GPa, fracture toughness of 7.12 +/- 1.33 MPa m1/2 and bending strength of 501 +/- 10MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Rubia Hassan, Kantesh Balani
Summary: The sintering mechanisms of ZrB2 and SiC-reinforced ZrB2 ceramic composites were investigated by determining the activation energy of densification in different temperature ranges. The results showed that the addition of SiC changed the prominent densification mechanism and impacted the mechanical performance with systemic increase of sintering temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Yan Wang, Yan Bao, Shifeng Luo, Cuiliu Han, Xinyu Yang, Jiuxing Zhang
Summary: In this study, polycrystalline La0.6Ce0.3Pr0.1B6-ZrB2 composites were prepared by spark plasma sintering (SPS) and their densification, microstructure, and properties were studied. The results showed that the composite material had good relative density and hardness, as well as high fracture toughness and oxidation resistance.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Jesus Lopez-Arenal, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Angel L. Ortiz
Summary: In this study, the reactive spark plasma sintering (RSPS) of ZrH2+2B powder mixtures subjected to shaker pre-milling was investigated. It was discovered that RSPS at 1850 degrees C resulted in fully-dense ZrB2 ceramics with a hardness of approximately 20 GPa. On the other hand, other sintering approaches such as simply-mixed powder, commercial ZrB2 powder, and shaker-milled ZrB2 powder resulted in non-dense and softer ZrB2 ceramics. Additionally, the optimized RSPS-ed ZrB2 ceramic showed promising potential as a tribo-ceramic with mild tribo-oxidative wear and the formation of a self-lubricating and protective oxide tribolayer.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Ambreen Nisar, Cheng Zhang, Benjamin Boesl, Arvind Agarwal
Summary: Ultra-high temperature ceramics (UHTCs) have shown potential in the thermal protection system (TPS) by designing multi-component UHTCs (MC-UHTCs) with improved oxidation resistance. The Hf6Ta2O17 superstructure is synthesized via solid-state reaction between HfO2 and Ta2O5 powder mixtures during spark plasma sintering (SPS). The high content of Hf6Ta2O17 phase and lower strain in the Ta2O5 phase contribute to the ability of 50HO-50TO to withstand intense plasma conditions. The thermo-mechanical stability of the Hf6Ta2O17 superstructure suggests the development of novel oxidation-resistant MC-UHTCs for reusable space vehicle applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Van-Huy Nguyen, Seyed Ali Delbari, Mehdi Shahedi Asl, Quyet Van Le, Abbas Sabahi Namini, Zohre Ahmadi, Mohammad Farvizi, Mohsen Mohammadi, Mohammadreza Shokouhimehr
Summary: This research investigated the sintering behavior and microstructure of ZrB2-based materials containing graphene nano-platelets and SiC whiskers using spark plasma sintering at 1900 degrees C. The addition of graphene was found to beneficially remove oxide impurities during sintering and contribute to porosity removal, resulting in unique nanostructural features.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Mitchell L. Sesso, Sonya Slater, John Thornton, George V. Franks
Summary: A method for producing hierarchical multi-scale porous ultra-high temperature ceramics (zirconium diboride, ZrB2) using 3D printing has been developed. The ceramics exhibit high strength to density ratio, making them potentially suitable for insulation near very high-temperature surfaces in aerospace applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Zohre Ahmadi, Mehdi Shahedi Asl, Mohammad Zakeri, Mohammad Farvizi
Summary: In this study, the influence of TiN addition on ZrB2-SiC composite was investigated. The addition of TiN increased the porosity content, resulting in a decrease in flexural strength but an increase in indentation fracture toughness and Vickers hardness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xiaochao Jin, Jingjing Yang, Yongle Sun, Pan Li, Cheng Hou, Yuxiang Zhao, Xueling Fan
Summary: In this study, ZrB2-SiC composite UHTCs parts were successfully joined using Ni foil as filler, forming the ZrB2-SiC/Ni/ZrB2-SiC (ZS/Ni/ZS) joint with good mechanical properties and oxidation resistance. The joint had a shear strength of approximately 161 MPa, demonstrating satisfactory performance. Additionally, the joint showed good oxidation resistance for a wide range of elevated temperatures (800-1600 degrees C), making it suitable for extreme environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Editorial Material
Materials Science, Multidisciplinary
Z. Y. Tan, Z. H. Xie, X. Wu, J. W. Guo, W. Zhu
Summary: High entropy A(6)B(2)O(17) ceramics with good hardness and fracture toughness are successfully prepared by solid state reaction combined with spark plasma sintering. The fracture toughness is independent of its components, but only related to its structure, and the ceramics exhibit good high temperature thermal stability.
Article
Chemistry, Physical
Xiaoan Lv, Xianhui Li, Junwei Huang, Changchun Ge, Qi Yu
Summary: In this study, dense Si3N4 ceramics were fabricated using coarse Beta silicon nitride powder through ultra-high pressure sintering and spark plasma sintering methods. The densification, microstructure, mechanical properties, and thermal conductivity were investigated. The results showed that spark plasma sintering can achieve high density and promote phase transition. Ultra-high pressure sintering can fragment grains and promote growth of elongated grains.
Article
Materials Science, Ceramics
P. Mazur, O. Grigoriev, D. Vedel, L. Melakh, I Shepa
Summary: ZrB2-MeC and ZrB2-19 vol% SiC-MexCy composites were prepared by pressureless sintering. The addition of different components can improve the densification ability and oxidation resistance of the materials, but adding Cr3C2 reduces the mechanical properties. ZrB2-SiC-Mo2C composite exhibits the best oxidation performance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Penghui Li, Mengdong Ma, Yingju Wu, Xiang Zhang, Yukai Chang, Zewen Zhuge, Lei Sun, Wentao Hu, Dongli Yu, Bo Xu, Zhisheng Zhao, Junyun Chen, Julong He, Yongjun Tian
Summary: By using nano-sized powders and SPS technology, high-density B4C ceramics were prepared with enhanced mechanical properties. Under the optimal SPS condition, the sample exhibited improved Vickers hardness, fracture toughness, and flexure strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Victor Zamora, Fernando Guiberteau, Oscar Borrero-Lopez, Angel L. Ortiz
Summary: The study investigates the densifiability by spark plasma sintering and the dry sliding-wear behavior of novel ZrC-Co cemented carbides. The results show that a ZrC-Co cemented carbide with ultra-hardness and sufficient toughness can be obtained at 1600 degrees Celsius, and the wear mechanism is primarily two-body abrasion dominated by plastic deformation.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Fernando Rodriguez-Rojas, Rafael Cano-Crespo, Oscar Borrero-Lopez, Arturo Dominguez-Rodriguez, Angel L. Ortiz
Summary: The study found that the dimensionality of carbon-based nano-reinforcements and testing conditions have a significant impact on the microstructural design of ceramic composites for tribological applications. Specifically, 3Y-TZP/rGO exhibited superior wear resistance compared to other materials, and wear resistance was found to be correlated with the formation of self-lubricating tribofilms rather than hardness or toughness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Cristina Ojalvo, Maria Jimenez-Fuentes, Wenjing Zhang, Fernando Guiberteau, Victor M. Candelario, Angel L. Ortiz
Summary: The fabrication process of B4C ultrafiltration membranes is described in this study. Environmental-friendly semi-dilute B4C slurry was prepared through aqueous colloidal processing and optimized using sonication for improved dispersion. The B4C membranes were deposited onto SiC macro-porous supports by dip-coating. The resulting green membranes were characterized microstructurally and pressureless sintered. The sintered membranes were then calcined and characterized again to identify the optimal conditions. The optimal membrane was further tested for its mechanical properties and filtration permeability. This research paves the way for the development of ceramic membranes based on B4C, which are lighter and potentially more durable for filtration applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Victor Zamora, Fernando Guiberteau, Angel L. Ortiz
Summary: The sliding-wear behavior of a newly-developed fine-grained ZrC-16.693 vol%Co cemented carbide was investigated in different media. It was found that the wear in water and alkaline medium was relatively small, while wear in acidic medium was the greatest. The wear mechanisms included abrasion controlled by plastic deformation and localized fracture, and the severity of wear depended on the properties of the medium.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Victor Zamora, Fernando Guiberteau, Oscar Borrero-Lopez, Angel L. Ortiz
Summary: The feasibility of fabricating super wear-resistant hard B4C composites was investigated using spark plasma sintering at an ultra-low temperature with high proportions of MoSi2 aids. The study found that the addition of 40% MoSi2 aids could achieve the ultrafast full densification of B4C at 1400 degrees C, resulting in hard and super wear-resistant composites with a quadruplex-particulate, fine-grained, fully-dense microstructure. This work opens up new possibilities for the low-cost fabrication of novel B4C composites for contact-mechanical and tribological applications.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Victor Zamora, Francisco J. Martinez-Vazquez, Fernando Guiberteau, Angel L. Ortiz
Summary: The feasibility of fabricating boron carbide-silicon carbide composites by spark-plasma sintering (SPS) at low temperature was investigated. The composites exhibited fine-grained structure, high hardness, moderate toughness, and affordability, making them attractive for engineering applications. The use of sufficient Si aids during SPS resulted in the formation of a eutectic melt, promoting low-temperature densification. Additionally, the original B4C underwent an isostructural crystallographic transition with the addition of Si.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Victor Zamora, Francisco J. Martinez-Vazquez, Fernando Guiberteau, Angel L. Ortiz
Summary: Two B4C-SiC composites with different SiC content were successfully prepared by spark-plasma sintering. The composite with 20%Si exhibited a hardness of 28.7 GPa, while the one with 4.28%Si showed an ultrahigh hardness of 35.1 GPa. Both composites demonstrated superior wear resistance compared to the reference B4C monoliths.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Jesus Lopez-Arenal, Bibi Malmal Moshtaghioun, Francisco L. Cumbrera, Diego Gomez-Garcia, Angel L. Ortiz
Summary: A powder metallurgy route combining high-energy ball-milling and reactive spark-plasma sintering is proposed for the controlled fabrication of novel composites based on a Zr-Al intermetallic matrix hardened with a ceramic second-phase. The combination of high-energy ball-milling and reactive spark-plasma sintering yields Zr3Al2+ZrB2 composites with fine-grained microstructures, high hardness, and relatively high toughness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Fernando Rodriguez-Rojas, Victor Zamora, Fernando Guiberteau, Angel L. Ortiz
Summary: B4C-SiC-TiB2 ceramic composites with equal volume fractions of the three phases (i.e., 1B4C-1SiC-1TiB2) were successfully fabricated by solid-state spark-plasma sintering (SPS). The optimized SPS-ed composite exhibited a triplex-particulate microstructure with evenly distributed carbide and boride grains, and showed ultrahardness and relatively high toughness. It also demonstrated an unprecedented super wear resistance to unlubricated sliding contact.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Francisco L. Cumbrera-Hernandez, Jesus Lopez-Arenal, Bibi Malmal Moshtaghioun, Angel L. Ortiz, Diego G. Gomez-Garcia
Summary: A model is developed in this study to accurately determine the crystallographic occupancies in B4C ceramics. The model is used to compute the crystal structure of B4C in maximum and minimum disorder states and can be applied to other ceramics with similar problems and complex systems.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Francisco L. Cumbrera, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Angel L. Ortiz
Summary: Accurate determination of structural disorder in spinels is crucial but challenging. This study proposes constrained-restrained Rietveld refinements of X-ray diffraction patterns to quantify the disorder. Mathematical modeling is used to formulate the constraints and restraints to be imposed during the refinements. The method is successfully applied to analyze the structural disorder in two custom-made spinels.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Antonio Diaz-Parralejo, David Maya-Retamar, Manuel Calderon-Godoy, Jose Sanchez-Gonzalez, Angel L. Ortiz
Summary: The influence of Y2O3 dopant on the optical and mechanical properties of ZrO2 thin films was studied. The microstructural characterization and analysis showed that the films crystallize in the cubic phase, regardless of dopant content. Additionally, it was observed that the refractive index increases while the optical absorption and extinction coefficients, hardness, and elastic modulus decrease with increasing Y2O3 dopant.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Jesus Lopez-Arenal, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Angel L. Ortiz
Summary: The unlubricated wear behavior of a Zr3Al2-ZrB2 composite was studied. Scratch, fretting, and sliding tests were performed under varied loads, and the worn surfaces were characterized to identify wear modes and mechanisms. The results showed a ductile-to-brittle transition in scratch wear, resistance to fretting wear, and mild damage under sliding wear with increasing load.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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)
