Article
Materials Science, Ceramics
Shuixian Yang, Jianmin Li, Hao Guo, Xiaojian Mao, Run Tian, Jian Zhang, Shiwei Wang
Summary: Highly transparent aluminate oxynitride (AlON) ceramics were successfully prepared by reactive sintering with a Y2O3-MgAl2O4-H3BO3 ternary additive, showing small grains and high transmittance. The addition of 0.1 wt.% Y2O3, 0.4 wt.% MgAl2O4, and 0.12 wt.% H3BO3 resulted in the best performance in terms of thickness and transmittance for AlON ceramics prepared by this method.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Chao Yu, Yongxiang Zheng, Guangchao Xing, Jun Ding, Hongxi Zhu, Zhoufu Wang, Chengji Deng, Jinghui Di
Summary: A novel strategy of fabricating AlN-AlON refractories via nitrogen gas pressure sintering of Al4O4C was investigated. The results showed that high N-2 pressure was crucial for effective nitridation. The as-fabricated AlN-AlON refractories exhibited optimal bending strength, low bulk density, and moderate apparent porosity. The diffusion of oxygen during the reaction process influenced the microstructure and properties of the refractories.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Xuan Jiang, Xiannian Sun, Liya Ma, Chaojun Huang, Yingchun Shan, Jiujun Xu, Jiangtao Li
Summary: A two-step heating strategy was used to fabricate transparent MgAlON ceramics by solid-state reaction. The highly infrared transparent ceramics were successfully prepared by dwelling at 1700 degrees C for 60 min followed by 150 min at 1880 degrees C. The secondary massive fragmentation of grown grains at 1700 degrees C resulted in minimized grain size and improved moveability of grains, leading to fast and high densification in the following sintering step.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Wenxin Du, Kailei Lu, Bing He, Xiaolan Zhou, Xu Huang, Jianqi Qi, Tiecheng Lu
Summary: In this study, transparent aluminate oxynitride (AlON) ceramic wafers were successfully fabricated through the direct non-aqueous tape casting of Al2O3/AlN slurry and one-step reaction sintering. The reaction sintered AlON ceramic wafer showed a high transmittance of 73.2% at a wavelength of 1600 nm. This fabrication method provides a smooth and flexible tape without cracks or pinholes in the Al2O3/AlN system, and significantly shortens the preparation cycle of transparent AlON wafers. It offers a feasible way to prepare high-quality transparent AlON ceramics with large lateral sizes and thin thicknesses, and may also promote the application of transparent AlON ceramic wafers.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Siyu Liu, Jiejie Zhu, Jingshu Guo, Kai Cheng, Minhan Mi, Lingjie Qin, Jielong Liu, Fuchun Jia, Hao Lu, Xiaohua Ma, Yue Hao
Summary: In this study, a low-damage plasma oxidation treatment for AlN/GaN HEMTs was developed, leading to the fabrication of high-performance E-mode AlON/AlN/GaN HEMTs. The treated devices effectively deplete the 2D electron gas channel, increase the breakdown voltage, and minimize the loss in output current.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Optics
Haoqi Geng, Wenhao Du, Hui Wang, Jiawei Li
Summary: The study investigates the mechanical behavior of magnesium aluminate spinel at the nanoscale through nanoindentation tests, revealing an evident indentation size effect. It is found that the grain boundary exhibits lower brittleness compared to the grain interior, with radial cracks forming on the grain surface as the indentation load exceeds 29 mN.
Article
Engineering, Chemical
Jiangcheng Yang, Timothy Bell, Massih Pasha
Summary: This study compares the performance of different testing instruments in measuring flowability of particulate systems. The UPT instruments from Freeman Technology show good repeatability in measuring uniaxial unconfined yield stress and bulk density, with the AUPT version having better repeatability. Compared to the Schulze RST, the AUPT provides faster measurements and lower values of unconfined yield stress.
Article
Engineering, Electrical & Electronic
B. Nageswara Rao, P. Tirupathi Rao, Sk. Esub Basha, D. S. L. Prasanna, K. Samatha, R. K. Ramachandra
Summary: Eu3+-activated magnesium aluminate phosphors were synthesized by the nitrate-citrate gel combustion method and thermal treatment. The samples exhibited crystallized cubic phase spinel structure and average crystallite sizes of 8.5-12.1 nm. The decomposition temperature was determined to be above 650(o)C. The band gap energy was calculated to be in the range of 5.08-5.19 eV. The PL emission of the phosphors showed strong red light in the wavelength range of 590-703 nm. The luminescence intensity decreased after 4 mol% Eu3+ concentration due to concentration quenching. The phosphors could be used for red LEDs.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Abhijeet Dhal, Saket Thapliyal, Supreeth Gaddam, Priyanka Agrawal, Rajiv S. Mishra
Summary: Smart alloying and microstructural engineering can mitigate challenges in laser-powder bed fusion additive manufacturing. This study combines multiscale nanomechanical and microstructural mapping to reveal the mechanical signatures associated with heat distribution and solidification in L-PBFAM. The presented approach serves as a high throughput methodology to establish the correlation between chemistry, processing, microstructure, and properties in newly designed alloys for L-PBFAM.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Ceramics
Weiwei Zhu, Yue Li, Haohao Zou, Guoqing Zu, Ying Han, Xu Ran
Summary: In this study, the La2O3-SiO2-B2O3 (LSB) glass filler with high softening temperature was used to join MgAl2O4 ceramic for the first time. The addition of Al2O3 into the LSB glass filler increased the thickness of the interfacial layer, while the addition of MgO decreased it. When the MgO content was 6 wt%, the interfacial layer disappeared and a completely amorphous brazing seam was obtained. The optimal in-line transmittance of the joint bonded with LSB6M glass filler reached 82.9% at 1000 nm, and the average flexural strength of the joints was about 196.2 MPa, equivalent to the strength of the MgAl2O4 substrate.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xiaoqiang Li, Juergen Malzbender, Gang Yan, Jesus Gonzalez-Julian, Ruth Schwaiger
Summary: In this study, nanoindentation and electron-backscatter diffraction experiments were used to investigate the correlation between elastic modulus and hardness of Ti2AlN and crystallographic orientation. Two different modeling approaches were employed to better understand and predict the anisotropic mechanical behavior of MAX phase materials, revealing that elastic modulus and hardness have different dependencies on crystal orientation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Metallurgy & Metallurgical Engineering
Jian Wu, Zhuo-jian Wang, Zhi-chen Hu, Xing-liang Liu, Dun-qiang Tan, Yu Dai, Dong-sheng Geng
Summary: The transparent AlON ceramics have attracted attention in commercial and military fields for their applications in infrared and visible windows, domes, and transparent armors. Despite progress, a comprehensive summary is still lacking, along with unresolved problems and challenges hindering their commercial promotion and application. In this review, various preparation methods of AlON ceramics are introduced, followed by a comparative analysis of their advantages and disadvantages. Transparency, sintering additives, and technologies of AlON ceramics are also discussed, along with the challenges and prospects they face.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Chemistry, Physical
Alessandro Schiavi, Claudio Origlia, Alessandro Germak, Andrea Prato, Gianfranco Genta
Summary: This study describes the experimental method and calculation model for determining the indentation moduli, work, and creep of metallic materials using macro-scale forces at room temperature. Various measurements and analysis methods were used to accurately determine these properties, with illustrative tests conducted on metal and alloy samples. Discussions were made regarding the suitability of the proposed methods and analysis.
Article
Materials Science, Multidisciplinary
T. dos Santos, A. Srivastava, J. A. Rodriguez-Martinez
Summary: The study introduces a self-similar cavity expansion model to analyze the dynamic indentation response of elasto-plastic porous materials, accounting for the plastic strain gradient induced size effect. Comparisons with experimental results show reasonable agreement for material hardness predictions over various indentation depths and speeds, highlighting the importance of considering the effects of indentation speed, size effect, and initial porosity.
MECHANICS OF MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Gabriel Kerbart, Christelle Harnois, Sylvain Marinel, Charles Maniere
Summary: This paper investigates the sintering characteristics of MgAl2O4 spinel using Olevsky's model to simulate the sintering trajectories. Densification and grain growth behaviors were identified through ramping and interrupted isothermal cycles, highlighting changes in final stage sintering mechanisms. The sintering trajectory model is proposed as a powerful numerical tool for sintering optimizations.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
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
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)