Article
Materials Science, Multidisciplinary
Jianian Hu, Youling Zhu, Haotian Zhang, Peibo Li, Jian Zhang, Guoqiang Luo, Qiang Shen
Summary: Al/SiC composites fabricated by plasma activated sintering (PAS) can achieve high relative density above 99% at 530°C. Plasma activation can remove oxide impurities on Al and SiC surface, which leads to the formation of an Al-Si diffusion layer and Si1-xC through Al and SiC reaction, resulting in the generation of Al4C3. The rapid sintering effect of PAS contributes to the high tensile strength of 256 MPa.
Article
Materials Science, Ceramics
Mettaya Kitiwan, Duangduen Atong, Fumio Endo, Takashi Goto
Summary: Fully dense Al2TiO5-Al2O3-TiN composites were fabricated by reactive sintering using spark plasma sintering. The addition of AlN resulted in a decrease in Al2TiO5 and an increase in Al2O3 and TiN. The lattice parameters of Al2TiO5 increased with AlN addition, indicating the incorporation of N atoms. The addition of AlN effectively produced fully densified bodies with small grain size, enhancing the mechanical properties of ATN composites. At 36 mol% AlN addition, the composite showed Vickers hardness of 16.26 +/- 1.61 GPa and fracture toughness of 5.20 +/- 0.46 MPa.m(1/2).
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2023)
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
Florimond Delobel, Julien Cambedouzou, Florence Moitrier, Sebastien Lemonnier
Summary: The study showed that the addition of low sintering aids content can improve the density of sintered β-SiC pellets close to theoretical density. The use of high sintering pressure helps maintain a fine microstructure and pristine cubic crystalline structure while preventing the formation of secondary phases.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Rohit Malik, Young-Wook Kim
Summary: The study found that moderate AlN addition significantly reduces the electrical resistivity of SiC ceramics, while excessive AlN addition can lead to an increase in resistivity. This is due to changes in carrier density and the formation of electrically insulating solid solutions and grain boundaries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Mehdi Shahedi Asl, Zohre Ahmadi, Farhad Sadegh Moghanlou, Mohammad Vajdi, Mohammadreza Shokouhimehr
Summary: This investigation examines the microstructure and mechanical properties of TiB2-SiC-graphene ceramics. The results show that the system is unreactive, preventing the in-situ nucleation of B4C and TiC phases. While the presence of TiO2 and B2O3 impurities is reduced with the addition of graphene nano-platelets (GNPs), SiO2 is confirmed to be present in the final microstructure. The TiB2 phase exhibits significantly higher hardness and Young modulus compared to the SiC phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Yu Hong, Jiaqin Liu, Yucheng Wu
Summary: The study prepared 50 vol% SiC/Al composites with different SiC particle size and Al alloy composition using Spark Plasma Sintering. The thermal properties, microstructures, and interface reaction products of the composites were investigated. The optimization of composite components and sintering process parameters were conducted. It was found that SiC particle size and sintering process parameters were crucial for obtaining high thermal-mechanical properties of the composites. The best physical properties were achieved in the 16 μm SiC/6061Al composites sintered at 50 MPa, 8 min, and 520°C, with bending strength of 649 MPa, thermal conductivity of 189 W/(m·K), and coefficient of thermal expansion of 7.9×10-6 K-1 at 50-100°C. XRD and SEM analysis revealed the absence of hazardous reaction product Al4C3 at the interface and the growth of MgAl2O4 and Mg2Si together at the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Shahabeddin Jafari, Mohammad Bavand-Vandchali, Mehri Mashhadi, Ali Nemati
Summary: The study investigates the effects of HfB2 addition on the sintering behavior, densification, and microstructure of ZrB2-SiC in the presence of B4C and MoSi2 as a sintering catalyst. Results show that increasing HfB2 leads to higher density, with samples containing MoSi2 having the highest density. X-Ray diffraction revealed the formation of ZrB2HfB2 solid solution, and the addition of HfB2 improves microstructural properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Sunil Kumar Kashyap, Rahul Mitra
Summary: A study has examined the effect of LaB6 addition on the compressive creep behavior of ZrB2-SiC composites. The results show that composites with higher LaB6 content have a lower steady-state creep rate at high temperatures. Grain boundary sliding and grain boundary diffusion are considered important factors influencing creep behavior.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(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, Multidisciplinary
Peng Gao, Cheng-Chang Jia, Wen-Bin Cao, Cong-Cong Wang, Guo-Liang Xu, Dong Liang, Zhao-Wen Cui
Summary: This study investigated the effects of powder mixed method, sintering temperature, and the additive amount of the conductive phase on the dielectric loss tangent and permittivity constant of AlN/Mo composite ceramics. The results showed that AlN composite ceramics with an additional 10 vol% Mo sintered at 1400 degrees C for 5 minutes exhibited the best dielectric loss tangent of over 0.23. AlN/Mo ceramics with an additional 20 vol% Mo became conductive with a resistivity of 0.05-0.06 omega center dot m. High-energy ball milling was found to be more effective than magnetic stirring powder mixing method. Additionally, the additive Mo and lower sintering temperature improved the properties in the electromagnetic wave frequency range of 1 x 10^3-1 x 10^6 Hz.
Article
Materials Science, Ceramics
B. Chahhou, J. Roger
Summary: The SPS reactive sintering of SiC/Ti3SiC2 composites with high SiC contents was studied. It was found that silicon lack was a limitation in the synthesis, and SiC additions had a deleterious effect on the reaction and densification. The composites with different SiC contents were successfully obtained.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
C. Garcia, J. D. Smith, J. Rodriguez, A. A. DiGiovanni, T. W. Scharf
Summary: SiC-TiC-diamond composites were fabricated via spark plasma sintering, and the behavior of composite densification was analyzed. The decomposition of diamond into carbon and the reactions with Si and Ti to form SiC and TiC were observed. The composite density decreased with the increase of hold temperature for uncoated diamond composites, while the porosity fraction increased for TiC-coated diamond composites.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Ceramics
Sandan Kumar Sharma, Kapil Chaudhary, Yashpal Gupta, Mitjan Kalin, B. Venkata Manoj Kumar
Summary: Spark plasma sintering was used to prepare SiC-TaC composites, and results showed that TaC particles were uniformly dispersed in the SiC matrix. With the increase in TaC content, the hardness decreased while the fracture toughness increased. Erosion testing revealed that the erosion rate increased with the increase in impingement angle and temperature, but decreased with the increase in TaC concentration.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Mingcheng Zhu, Lan Zhang, Na Li, Desen Cheng, Jidong Zhang, Shiyao Yu, Hui Bai, Huizhong Ma
Summary: In this study, ternary ZrB2-SiC-MoSi2 composites with different compositions were successfully fabricated by reactive spark plasma sintering. The densification behavior, microstructures, and mechanical properties were investigated. It was found that the addition of MoSi2 could improve the relative density, hardness, and fracture toughness of the composites, and a core-shell structure could be formed to enhance the overall performance.
CERAMICS INTERNATIONAL
(2022)