Article
Materials Science, Ceramics
Behzad Nayebi, Mehdi Shahedi Asl, Maryam Akhlaghi, Zohre Ahmadi, Seyed Ali Tayebifard, Esmaeil Salahi, Mohammadreza Shokouhimehr, Mohsen Mohammadi
Summary: The TiB2-Ti3AlC2 ceramic was successfully manufactured using spark plasma sintering, with Ti3AlC2 additive decomposing at the initial stages of sintering. The final ceramic exhibited a near full density of around 99% and a hardness of approximately 28 GPa, with densification mechanism and sintering phenomena discussed and graphically illustrated.
CERAMICS INTERNATIONAL
(2021)
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
Leyla Yanmaz, Filiz Cinar Sahin
Summary: Square-shaped monolithic B4C and B4C-ZrB2 composites were produced using SPS method. The addition of 5, 10, 15 vol% ZrB2 had an effect on the densification, mechanical and microstructural properties of boron carbide. The density of B4C increased with increasing volume fraction of ZrB2 and the density differences in different regions of the sample decreased. The addition of ZrB2 enhanced the hardness and fracture toughness of the composites compared to monolithic B4C. The B4C-15 vol% ZrB2 composite exhibited superior properties with a hardness of 33.08 GPa and Vickers indentation fracture toughness of 3.82 MPa·m1/2.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Ipek Akin, Burak Cagri Ocak, Melis Kaplan Akarsu, Onuralp Yucel, Filiz Sahin, Gultekin Goller
Summary: The study investigated the effect of GNP concentration on the mechanical properties of spark plasma sintered TiB2 and NbB2 ceramics, finding that GNPs enhance densification while also affecting microhardness. NbB2-GNP composites exhibited higher fracture toughness and better oxidation resistance compared to TiB2-GNP composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hongwei Li, Rui Wang, Hong Chen, Huaijun Guan, Xin Liu, Hongwei Guo, Fan Lv, Xiaolong Lu
Summary: Boron nitride nanoplatelet (BNNP) has been investigated as a potential reinforcement to improve the toughness of glass-ceramics. In this study, glass-ceramic composites reinforced with well-dispersed BNNPs were fabricated using spark plasma sintering. The addition of BNNP enhanced the mechanical properties of the composites and inhibited the nucleation and growth of diopside. The toughening mechanisms were identified as crack deflection, BNNP pull-out, crack blocking, and crack bridging, and a toughening model was established to optimize the design of BNNP-reinforced composites.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
Elaheh Ranjbarpour Niari, Mohammad Vajdi, Milad Sakkaki, Shahla Azizi, Farhad Sadegh Moghanlou, Mehdi Shahedi Asl
Summary: Spark plasma sintering is an interesting manufacturing method that benefits from electric current heating. In this study, the sintering process of hafnium diboride ceramics was simulated using the finite element method and COMSOL Multiphysics software. The results showed the required temperature for sintering and the distribution of electric current in the system.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Mary A. Awotunde, Peter A. Olubambi, Daolun Chen
Summary: In this study, carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy. The compressive behavior of the sintered NiAl-CNT composites at room temperature was evaluated, with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. The results showed that the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness due to the presence of both coarse and fine bimodal grains in its microstructure.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Kai Zhai, Shaohui Chen, Chengduo Wang, Qingkui Li, Benshuang Sun, Jilin He
Summary: A novel low-cost WC-CoCuFeNi cemented carbide has been produced using spark plasma sintering technology. The newly-developed cemented carbides exhibit a good combination of hardness and fracture toughness, making them a promising substitute for WC-Co.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Behzad Nayebi, Seyed Ali Delbari, Mehdi Shahedi Asl, Ehsan Ghasali, Nader Parvin, Mohammadreza Shokouhimehr
Summary: A novel TiB2-based composite, with metallic vanadium and nano-graphite additives, was fabricated by spark plasma sintering, resulting in the in-situ synthesis of V3B4, V6C5, and TiC phases which led to significant improvements in mechanical properties. The composite exhibited a 50% increase in fracture toughness and 27% enhancement in elastic modulus compared to monolithic TiB2 consolidated through similar conditions.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Ceramics
Ting Wang, Haiming Zhang, Lixia Cheng, Shenhua Song, Weiping Gong
Summary: Perovskite solid solution materials 0.67BiFeO(3)-0.33BaTiO(3) were synthesized using spark plasma sintering method. The materials sintered at 880℃ showed the highest density, compact microstructure, and enhanced fermelectric properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yang Wang, Qiang Liu, Biao Zhang, Haoqian Zhang, Yicheng Jin, Zhaoxin Zhong, Jian Ye, Yuhan Ren, Feng Ye, Wen Wang
Summary: Fully-dense B4C-SiC-TiB2 composites with high strength and toughness were successfully prepared through in-situ reactive spark plasma sintering using B4C and TiSi2 as raw materials. TiSi2 was confirmed as a reactive sintering additive that promoted densification, while SiC-TiB2 agglomerates played a critical role in improving toughness in the composite material.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xing Jin, Chenjun Tang, Qinggui Li, Dong Wang, Xiang Ding, Songlin Ran
Summary: Nearly fully dense B4C-VB2 composite ceramics were prepared by reactive spark plasma sintering (SPS) technology, and the effects of the degassing time on the microstructure and mechanical properties were investigated. The optimal degassing time of 6 min resulted in excellent comprehensive performance of the final product.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
H. Unsal, S. Grasso, A. Kovalcikova, O. Hanzel, M. Tatarkova, I Dlouhy, P. Tatarko
Summary: Homogenous, fully dense samples free of graphene were obtained by using insulating Al2O3 paper during reactive SPS. Isolated SPS had the main advantages of short dwell time (30 s after a degassing step of 6 min) and uniform distribution of fine TiB2 grains over the reactive hot press and SPS processes, respectively.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Lei Sun, Mengdong Ma, Penghui Li, Kun Luo, Bing Liu, Baozhong Li, Yingju Wu, Pan Ying, Yang Zhang, Zihe Li, Julong He, Zhisheng Zhao
Summary: Tough and hard ultrafine-grained B4C-cBN composites were fabricated by high-pressure sintering, with the introduction of cBN enhancing the hardness and fracture toughness of the material. The composite with 50% cBN content exhibited excellent mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jie Liang, Xuetong Zhao, Shenglin Kang, Jing Guo, Zhiling Chen, Yuli Long, Qian Zeng, Jianjie Sun, Lijun Yang, Ruijin Liao, Clive A. Randall
Summary: In this work, a hybrid cold sintering/spark plasma sintering (CSP-SPS) process is demonstrated for densifying and controlling grain growth in ZnO ceramics. The CSP-SPS process achieves high densities (>98%) at lower temperatures (200-300 ℃) and exhibits mild grain coarsening.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Correction
Materials Science, Ceramics
Guo-Qing Li, Min Yu, Guo-Wei Lin, Yun-Long Wang, Li-Xia Yang, Ji-Xuan Liu, Francesco Gucci, Guo-Jun Zhang
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yue Wu, Weichao Bao, Xiao-Qin Shen, Ji-Xuan Liu, Yuan Qin, Yongcheng Liang, Fangfang Xu, Guo-Jun Zhang
Summary: ZrB2-based solid solution ceramics with different mixing entropies were prepared and it was found that the formation of a single-phase solid solution is independent of the mixing entropy. The addition of other diborides promotes densification and reduces particle size. Samples with higher mixing entropy have finer grain size, higher hardness, and modulus.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yingtong Pan, Ji-Xuan Liu, Tian-Zhe Tu, Wenzhong Wang, Guo-Jun Zhang
Summary: The notion of entropy engineering has revitalized the research and development of sophisticated functional materials. High-entropy materials, particularly high-entropy alloys, have gained significant attention in environmental science and renewable energy technology. However, systematic research on high-entropy ceramics is still lacking. Recent studies suggest that high-entropy oxides, belonging to high-entropy ceramics, show potential as next-generation catalysts. This review provides an overview of the concept, synthesis methods, and catalytic performance of high-entropy oxides, highlighting their advantages as functional catalytic materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Yuzhu Guo, Xudong Chen, Jixuan Liu, Tao Chen, Jin Wu
Summary: The effects of interface roughness on fracture behaviors of rock-concrete specimens are investigated using acoustic emission (AE) and digital image correlation (DIC) techniques. The fracture process of the granite-concrete specimens with different interfacial roughnesses is monitored under three-point bending (TPB) load. The initial fracture toughness and characteristic parameters of the AE are calculated and discussed. A transient critical response equation and a stress-crack opening displacement model for the rock-concrete interface crack opening displacement (COD) based on micro-macro crack interactions are established. The model parameters are determined by the DIC technique, and the fracture energies of interfaces with different roughnesses are calculated based on the model. The validity of the model is verified by comparing the calculation results with those from existing fracture energy calculation methods.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Chemistry, Physical
Fei Li, Lin Zhou, Ji-Xuan Liu, Guo-Jun Zhang
Summary: A simple sol-gel method is used to prepare hierarchical porous silicon carbide (SiC) monoliths. The monoliths have macropores of 4.5 μm and mesopores of 2.0 nm. The porous SiC monoliths have porosities of 71.3%, a specific surface area of 171.5 m(2)/g, and a compressive strength of 7.0 +/- 0.8 MPa.
Article
Materials Science, Ceramics
Lin Zhou, Ji-Xuan Liu, Tian-Zhe Tu, Yue Wu, Guo-Jun Zhang
Summary: This study reports a fast grain growth phenomenon in high-entropy ceramics and suggests that the grain growth behavior in these ceramics is not dominated by the sluggish diffusion effect. XPS analysis reveals the presence of more oxygen vacancies in high-entropy ceramics, which promotes the migration and diffusion of cations and increases the grain growth rate.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Gang Cheng, Ji-Xuan Liu, Yuan Qin, Yue Wu, Guo-Jun Zhang
Summary: In this study, single-phase high-entropy diboride ceramics (HEBs) with 5-9 cations were prepared by spark plasma sintering using self-synthesized HEB powders. The distribution of metal elements in the obtained HEBs was uniform. The thermal conductivity of the ceramics decreased with increased configurational entropy or the number of cation kinds due to the phonon scattering caused by inherent lattice distortion in HEBs. However, this study reveals a weakening tendency of reduction in thermal conductivity for HEBs with more than 6 cation kinds.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Environmental
Fei Li, Naokatsu Kannari, Jun Maruyama, Kazuyoshi Sato, Hiroya Abe
Summary: Water pollution caused by dyes is a significant environmental issue, and adsorption technology has been widely used for wastewater treatment. In this study, surface defective hydroxides designed using the high-entropy concept efficiently remove dyes from water. Multi-element hydroxides (MEHs) with different compositions are synthesized through a polyol process and exhibit rapid adsorption kinetics due to increased surface defects. MEH-Quinary and MEH-Ternary show high removal efficiency of over 99.0% within 30 seconds for Congo red and methyl orange, respectively, with pseudo-second-order rate constants two orders of magnitude higher than activated carbon and hydrotalcite. MEH-Quinary also has a high adsorption capacity and potential as an electrocatalyst for oxygen evolution reaction.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Materials Science, Ceramics
Ji-Xuan Liu, Liwei Guo, Yue Wu, Yuan Qin, Yongcheng Liang, Guo-Jun Zhang
Summary: Due to the presence of core effects, the impact of carbon vacancy in high-entropy carbides differs from that of transition metal monocarbides. Nonstoichiometric high-entropy carbides with variable carbon vacancy concentration were fabricated using powder mixtures and spark plasma sintering. The decline rates of lattice constant and elastic modulus were slower in high-entropy carbides with higher carbon vacancy concentration, indicating a more rigid crystalline lattice.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yu-Yun Cheng, Lin Zhou, Ji-Xuan Liu, Yu-Feng Tan, Guo-Jun Zhang
Summary: This study investigates the grain growth kinetics of high-entropy diboride (HEB) and HEB-SiC ceramics during heat treatment. The results show that the growth of HEB phase is controlled by interface-controlled kinetics in HEB ceramics and grain-boundary pinning in HEB-SiC ceramics. The sluggish diffusion effect and the presence of segregated second-phase particles at the grain boundaries contribute to the grain growth inhibition in the high-entropy ceramic system.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xiao-Ting Xin, Weichao Bao, Xin-Gang Wang, Xiao-Jie Guo, Ying Lu, Chenxi Zhu, Ji-Xuan Liu, Qiang Li, Fangfang Xu, Guo-Jun Zhang
Summary: High-entropy ceramics (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C exhibit smaller irradiation-induced lattice expansion, favorable structural evolution, and better performance in irradiation and helium behavior. This study indicates the high potential of high-entropy ceramics in irradiation resistance applications.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Tian-Zhe Tu, Ji-Xuan Liu, Yue Wu, Lin Zhou, Yongcheng Liang, Guo-Jun Zhang
Summary: This study proposed a strategy to improve the properties of rare-earth aluminates (REAlO3) through high-entropy engineering and particulate toughening. High-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)AlO3 (HEAO)-based particulate composites with different contents of high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Zr2O7 (HEZO) were successfully prepared, exhibiting low thermal conductivity and high fracture toughness.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Yuan Qin, Xiao-Feng Wei, Ji-Xuan Liu, Yongcheng Liang, Guo-Jun Zhang
Summary: High-entropy carbide ceramics with 0-40 at.% nominal carbon vacancy were prepared by adding metal Hf into HEC as a case study. The samples exhibited high density, single-phase structure, and homogeneous distribution of metal elements. The lattice parameters increased gradually with the added Hf content.
ADVANCES IN APPLIED CERAMICS
(2023)
Article
Chemistry, Multidisciplinary
Jian Cui, Xingwei Zheng, Weichao Bao, Ji-Xuan Liu, Fangfang Xu, Guo-Jun Zhang, Yongcheng Liang
Summary: This study synthesized a high-entropy dodecaboride composite (HEDC) with high hardness and electrical conductivity by forming atomic-scale interlocking layers. The HEDC achieves superhardness by inheriting its constituent phases' high intrinsic hardness and restricting dislocation motion, while maintaining excellent electrical conductivity.