Article
Materials Science, Ceramics
Liang Xu, Kun-Heng Huang, Wei-Ming Guo, Yang Liu, Yang You, Zi-Jian Huang, Hua-Tay Lin
Summary: B4C-(Hf,Zr,Ta,Nb,Ti)B2 composites were prepared using self-synthesized (Hf,Zr,Ta,Nb,Ti)C powder by reactive and non-reactive spark plasma sintering methods, and compared with previously reported composites prepared using commercial transition metal carbides. The materials prepared with self-synthesized powder showed higher relative densities, smaller grain sizes, more homogeneous elemental distribution and higher Vickers' hardness. However, B4C-(Hf,Zr,Ta,Nb,Ti)B2 prepared by non-reactive spark plasma sintering exhibited a more uniform phase distribution and a higher Vickers' hardness of about 30 GPa compared to reactive spark plasma sintering.
CERAMICS INTERNATIONAL
(2023)
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
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
Monika Hrubovcakova, Tamas Csanadi, Richard Sedlak, Alexandra Kovalcikova, Ivan Shepa, Erika Mudra, Tibor Sopcak, Hakan Unsal, Peter Tatarko, Pavol Sajgalik, Jan Dusza
Summary: High-energy ball milling, mixing with SiC whiskers, and spark plasma sintering were used to process a (Hf-Ta-Zr-Nb-Ti)C-SiC composite. The resulting composite exhibited a high relative density of 99.4% and consisted of a single-phase high-entropy carbide (HEC) matrix with homogeneously distributed SiC phase. The SiC whiskers showed degradation into particles. The HEC matrix had a grain size ranging from 1.0-5.0 μm, while the diameter of the SiC phase was about 0.5-6.0 μm with a low aspect ratio. The nano-hardness of the HEC matrix and SiC phase was approximately 38 GPa and 42 GPa, respectively. The addition of SiC increased the microhardness and indentation fracture resistance of the material.
CERAMICS INTERNATIONAL
(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
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)
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
Xincheng Wang, Theo G. Saunders, Richard Sedlak, Tamas Csanadi, Yichen Wang, Jan Dusza, Li Fu, Michael J. Reece
Summary: Novel (Zr-Hf-Nb-Ta)C-xCo high entropy cermets were successfully synthesized and densified using a simple two-step high temperature process. Degassing of the powders before infiltration significantly reduced defects, with the best hardness achieved at 10 wt% Co and highest indentation crack resistance at 20 wt% Co.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
C. Guerin, A. Bassoulet-Saintonge, A. Allemand, A. Maitre, R. Boulesteix, T. Piquero, Y. Le Petitcorps
Summary: The barium aluminosilicate compound (BaAl2Si2O8 or BAS) was synthesized using powder reactive sintering in a Spark Plasma Sintering (SPS) device. The reaction pathways between the precursors (alumina, silica, and barium carbonate powders) were investigated at different temperatures from 900 to 1550 degrees Celsius to obtain the desired hexacelcian crystallographic form of BAS without any unwanted compounds. A three-step thermal treatment was proposed to achieve a fully dense and nearly pure (98 wt%) BAS.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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
Microscopy
Zohre Ahmadi, Mehdi Shahedi Asl, Mohammad Zakeri, Mohammad Farvizi
Summary: This study investigated the mechanical properties and sintering behavior of additive-free and TiN-doped ZrB2 ceramics. TiN addition was found to improve the densification and mechanical properties of the ceramics.
Article
Engineering, Chemical
Abbas Sabahi Namini, Seyed Ali Delbari, Mehdi Shahedi Asl, Quyet Van Le, Mohammadreza Shokouhimehr
Summary: This study evaluated the influence of SiC addition on the microstructure development, mechanical characteristics, and densification behavior of (Zr,Ti)B-2-ZrC materials. The addition of SiC improved the relative density values and mechanical properties, leading to the formation of a solid-solution of (Zr,Ti)B-2.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
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, Ceramics
F. Giovannelli, E. Sabarthes, F. Delorme
Summary: In this study, spark plasma sintering was used to prepare dense ceramics of La7Mo7O30 from La2Mo2O9 powder and investigate their thermoelectric properties. The experimental results show that La2Mo2O9 was reduced to La7Mo7O30 during the SPS process. The obtained La7Mo7O30 ceramic exhibits semiconducting behavior with a high electrical conductivity at 1000 K and a very low thermal conductivity throughout the temperature range from room temperature to 1000 K. The figure of merit reached 0.04 at 1000 K.
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)
