Article
Materials Science, Ceramics
Yumi Fukuda, Koichi Harada, Maki Yonetsu, Ariane K. Albessard, Yasushi Hattori, Kenji Essaki, Yasuhiro Goto, Tomohiro Suetsuna
Summary: In this study, the thermal conductivity of sintered reaction-bonded silicon nitride (SRBSN) was found to increase with sintering temperature, while the lattice oxygen content decreased with increasing temperature. The analysis also revealed that the lattice oxygen substitution in beta-Si3N4 crystals could affect thermal conductivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Yuki Nakashima, You Zhou, Keisuke Tanabe, Souhei Arima, Teruhisa Okuno, Kiyoshi Hirao, Tatsuki Ohji, Manabu Fukushima
Summary: Sintered reaction-bonded silicon nitride ceramics were prepared with yttria and magnesia as sintering additives. The nitrogen pressure (0.1-1.0 MPa) was found to affect the microstructure, bending strength, fracture toughness, and thermal conductivity. The ratio of β phase increased with higher nitrogen pressure, resulting in a stable three-dimensional structure and the presence of pores in the sintered body. The properties of the ceramics varied depending on the nitridation mechanism, with the best properties observed at 0.1 MPa nitrogen pressure.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Yuki Nakashima, You Zhou, Keisuke Tanabe, Souhei Arima, Kiyoshi Hirao, Tatsuki Ohji, Manabu Fukushima
Summary: In this study, sintered reaction-bonded silicon nitride ceramics were prepared using yttria and magnesia as sintering additives, and the effects of the nitridation temperature on their properties were investigated. The results showed that increasing the nitridation temperature resulted in an increase in the ratio of beta-phase, improved bending strength, and increased thermal conductivity. This suggests that elevating the nitridation temperature can simultaneously enhance the strength and thermal conductivity of the ceramics.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Yinsheng Li, Ha-Neul Kim, Haibo Wu, Mi-Ju Kim, Jae-Woong Ko, Young-Jo Park, Zhengren Huang, Hai-Doo Kim
Summary: The Y2O3 content in Si3N4 ceramics affects the microstructure and thermal conductivity, with higher Y2O3 content leading to changes in liquid phase behavior and grain size distribution. The microstructure significantly influences the thermal conductivity of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Yuki Nakashima, You Zhou, Keisuke Tanabe, Souhei Arima, Kiyoshi Hirao, Tatsuki Ohji, Norimitsu Murayama, Manabu Fukushima
Summary: Silicon nitride ceramics were prepared using a sintered reaction-bonded method, and the microstructure and dielectric breakdown strength of the ceramics were evaluated. The study found a correlation between the thickness of the ceramics and their dielectric breakdown strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Liang Wang, Wei-Ming Guo, Peng-Fei Sheng, Li-Fu Lin, Xiao Zong, Shang-Hua Wu
Summary: A new type of non-oxide sintering additive, YH2, was introduced to fabricate AlN ceramics with high thermal conductivity and flexural strength. The effects of YH2 addition on the phase composition, densification, microstructure, thermal conductivity, and flexural strength were investigated. The results showed that the addition of YH2 improved the densification and microstructure, resulting in high flexural strength and thermal conductivity. However, excessive YH2 addition inhibited the densification behavior of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Shishuai Li, Yongfeng Xia, Dongxu Yao, Hanqin Liang, Yu-Ping Zeng
Summary: Sintered reaction-bonded silicon nitride (SRBSN) with high thermal conductivity was obtained using (Y0.96Eu0.04)(2)O-3 and MgO as sintering additives. The addition of (Y0.96Eu0.04)(2)O-3 and MgO significantly improved the thermal conductivity, hardness, and flexural strength of the sintered silicon nitride.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Wang Weide, Chen Huanbei, Li Shishuai, Yao Dongxu, Zuo Kaihui, Zeng Yuping
Summary: By using YbH2 as a substitute for Yb2O3, silicon nitride with enlarged grains, purified lattice, and reduced intergranular phase can be obtained, leading to an increase in thermal conductivity. YbH2-MgO is effective for obtaining Si3N4 ceramics with both high flexural strength and high thermal conductivity.
JOURNAL OF INORGANIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chae-Eon Lee, Mi-Ju Kim, Young-Jo Park, Jae-Woong Ko, Ha-Neul Kim, Sunghwan Bae
Summary: The effect of silicon particle size on the beta-phase ratio, microstructure, and flexural strength of porous sintered reaction-bonded silicon nitride (SRBSN) was investigated. High flexural strength of SRBSN over 400 MPa was obtained when the amount of SiO2 was less than 0.7 due to the presence of rod-like beta-particles, while a lower flexural strength was observed when equiaxed beta-particles dominated.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Miao Zhou, Yun Liu, Xiaolei Li, Tianyi Sui, Dong Su, Huiming Ji
Summary: Silicon nitride (Si3N4) ceramics were prepared using Y2O3-MgSiN2 as a sintering additive, and the densification behavior, phase transition, and microstructure evolution were investigated. The microstructure was found to change from bimodal to homogeneous with a decrease in grain size as the Y2O3-MgSiN2 content increased. The sample with 6 mol% Y2O3-MgSiN2 exhibited excellent performance with a high thermal conductivity of 84.1 W/(m · K), fracture toughness of 8.97 MPa m1/2, and flexural strength of 880.2 MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Weide Wang, Dongxu Yao, Hanqin Liang, Yongfeng Xia, Kaihui Zuo, Jinwei Yin, Yu-Ping Zeng
Summary: The addition of GdH2 increases the N/O ratio in the liquid phase, enhancing thermal conductivity while reducing flexural strength at high temperatures. This is mainly due to the exaggerated bimodal microstructure resulting from the substitution of Gd2O3 by GdH2.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jung Hoon Kong, Ho Jin Ma, Wook Ki Jung, Juseop Hong, Kisoo Jun, Do Kyung Kim
Summary: A self-reinforced Si3N4 ceramic with high thermal conductivity was prepared through multi-step pressureless sintering with Y2O3 and MgO additives, achieving improved flexural strength and thermal conductivity by utilizing a partial α-β phase transformation to establish a bimodal microstructure. The rate constant and activation energy of the sintering process were calculated to assess the potential of obtaining the proper quantity of α-Si3N4 seeds through the phase transformation.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jiabin Hu, Bo Zhang, Cong Li, Laili Wang, Shenghe Wang, Zhongqi Shi, Jianfeng Yang
Summary: The effects of pre-sintering temperature on the properties of Si3N4 ceramics were studied, and it was found that the Si3N4 ceramics with a bimodal microstructure prepared under specific pre-sintering and high-temperature sintering conditions exhibited the highest thermal conductivity and flexural strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Ha-Neul Kim, Mi-Ju Kim, Young-Jo Park, Jae-Woong Ko
Summary: The study found that Yb(2)O(3) is an effective additive to promote low-temperature nitridation of Si compacts, resulting in a strong porous SRBSN with good flexural strength. The excellent mechanical properties after post-sintering are attributed to the removal of oxygen during the nitridation reaction, as supported by the analysis of oxygen content via laser-induced breakdown spectroscopy.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Li-Xiang Wu, Lin-Lin Zhu, Yang You, Rui-Lin Lin, Qing-Qing Liu, Wei-Ming Guo, Hua-Tay Lin, Kevin Paul Plucknett
Summary: PSRBSN ceramics were successfully prepared using a hot-press sintering method, with added Eu2O3-MgO-Y2O3 promoting full nitridation of Si powder, resulting in improved ceramic properties. The addition of 5 wt% Eu2O3 led to higher relative density, hardness, strength, and thermal conductivity compared to non-doped samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Norimasa Nishiyama, Suguru Kitani, Yuki Ohta, Eleonora Kulik, Zuzana Netriova, Astrid Holzheid, Zoltan Lences, Hitoshi Kawaji, Fumihiro Wakai
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Ondrej Hanzel, Zoltan Lences, Young-Wook Kim, Jan Fedor, Pavol sajgalik
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Young-Wook Kim, Shynar Kultayeva, Jaroslav Sedlacek, Ondrej Hanzel, Peter Tatarko, Zoltan Lences, Pavol Sajgalik
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Maxime Balestrat, Emanoelle Diz Acosta, Ondrej Hanzel, Nicolas Tessier-Doyen, Ricardo Machado, Pavol Sajgalik, Zoltan Lences, Samuel Bernard
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Miroslav Hnatko, Michal Hicak, Martina Labudova, Dagmar Galuskova, Jaroslav Sedlacek, Zoltan Lences, Pavol Sajgalik
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Editorial Material
Materials Science, Ceramics
Zoltan Lences, Pavol Sajgalik
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Chemistry, Applied
A. I. Klyndyuk, I. V. Matsukevich, M. Janek, E. A. Chizhova, Z. Lences, O. Hanzel, P. Veteska
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
(2020)
Article
Materials Science, Ceramics
Patricia Petriskova, Olivier Monfort, Leonid Satrapinskyy, Edmund Dobrocka, Tomas Plecenik, Gustav Plesch, Roman Papsik, Raul Bermejo, Zoltan Lences
Summary: TiO2 nanotubes were prepared on different substrates to compare their photocatalytic activity, and nanotubes grown on Ti foil exhibited the best photocatalytic activity.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yuki Nakashima, Yuki Ozeki, You Zhou, Hideki Hyuga, Shinobu Hashimoto
Summary: The study found that increasing magnesium content is efficient for synthesizing single-phase MgSiN2 under 0.1 MPa of nitrogen. The combustion temperature is influenced by the silicon content and nitrogen pressure.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Kiyoshi Hirao, You Zhou, Hideki Hyuga, Shijo Nagao, Katsuaki Suganuma, Naoki Wakasugi
Summary: The study developed a new measurement method to evaluate the heat releasing performance of metallized ceramic substrates, and evaluated the thermal resistance of several kinds of Cu-metalized ceramic substrates. The measured values had high accuracy within a small error range and showed good agreement with estimated values by finite element method (FEM) analyses.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Michal Hicak, L'ubomir Medvecky, Miroslav Hnatko, Radoslava Stulajterova, Maria Giretova, Monika Tatarkova, Zoltan Lences, Pavol Sajgalik
Summary: The addition of highly porous silicon nitride/alpha-tricalcium phosphate microgranules improved the tetracalcium phosphate/monetite biocement, serving as a potential carrier for drug release. By adjusting the amount of drug-infiltrated ceramic granules, the total drug release time can be modified.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ondrej Hanzel, Zoltan Lences, Peter Tatarko, Richard Sedlak, Ivo Dlouhy, Jan Dusza, Pavol Sajgalik
Summary: Silicon carbide-based composites with graphene nanoplatelets were prepared in three and five layers to achieve high electrical conductivity, especially suitable for electric discharge machining. Increasing sintering pressure significantly improved the electrical conductivity of the composites, with a positive influence on individual layers with higher GNPs content. While there was a decrease in hardness and elastic modulus, the materials showed good adhesion between layers with no delamination observed in scratch tests.
Article
Materials Science, Ceramics
Yuki Nakashima, You Zhou, Keisuke Tanabe, Souhei Arima, Kiyoshi Hirao, Tatsuki Ohji, Norimitsu Murayama, Manabu Fukushima
Summary: Silicon nitride ceramics were prepared using a sintered reaction-bonded method, and the microstructure and dielectric breakdown strength of the ceramics were evaluated. The study found a correlation between the thickness of the ceramics and their dielectric breakdown strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yuki Nakashima, You Zhou, Keisuke Tanabe, Souhei Arima, Teruhisa Okuno, Kiyoshi Hirao, Tatsuki Ohji, Manabu Fukushima
Summary: Sintered reaction-bonded silicon nitride ceramics were prepared with yttria and magnesia as sintering additives. The nitrogen pressure (0.1-1.0 MPa) was found to affect the microstructure, bending strength, fracture toughness, and thermal conductivity. The ratio of β phase increased with higher nitrogen pressure, resulting in a stable three-dimensional structure and the presence of pores in the sintered body. The properties of the ceramics varied depending on the nitridation mechanism, with the best properties observed at 0.1 MPa nitrogen pressure.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
A. I. Klyndyuk, I. V. Matsukevich, M. Janek, E. A. Chizhova, Z. Lences, O. Hanzel, P. Veteska
INORGANIC MATERIALS
(2020)