Journal of Central South University最新文献_第10页

3,3′-dithiodipropionic acid as a functional electrolyte additive in lithium-sulfur battery 作为锂硫电池功能性电解质添加剂的 3,3′-二硫代二丙酸

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-03-25 DOI: 10.1007/s11771-024-5562-2

Shi-yu Shao, Liang He, Ji-wei Zhang, Si-min Li, Bo Hong, Kai Zhang, Jie Li

{"title":"3,3′-dithiodipropionic acid as a functional electrolyte additive in lithium-sulfur battery","authors":"Shi-yu Shao, Liang He, Ji-wei Zhang, Si-min Li, Bo Hong, Kai Zhang, Jie Li","doi":"10.1007/s11771-024-5562-2","DOIUrl":"https://doi.org/10.1007/s11771-024-5562-2","url":null,"abstract":"High-energy-density lithium-sulfur (Li-S) batteries are among the most promising energy storage devices, but their potential has been constrained by the shuttle effect and poor active material utilization. Here, 3,3′-dithiodipropionic acid (DTPA), an efficient electrolyte additive, is applied to Li-S batteries while its underlying mechanism on the electrochemical performance is examined. The results show that the DTPA additive can quickly interact with the polysulfides scattered in the electrolyte, facilitating the conversion of long-chain polysulfides to Li2S2 and Li2S. In this way, by lessening the shuttle effect of long-chain polysulfides towards the anode, the redox kinetics and the usage of active materials can both be improved. The electrochemical performance of Li-S batteries is thus enhanced by the addition of DTPA, with capacities of 1093.4 mA · h/g for the initial cycle and 714.8 mA · h/g after 250 cycles at 0.5C (DTPA concentration is 1.5 wt.%). Also, the DTPA-containing batteries have higher electrochemical stability, with a capacity retention rate of 57.5% relative to 0.1 C at 2C. The improved performance demonstrates the importance of electrolyte additives, and the DTPA introduced in this work offers a potential solution for reducing the shuttle effect of polysulfide to increase the capacity of Li-S batteries.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"22 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140300830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage mechanism and fracture evolution of rock containing defects with LCEM-GFEM method under explosive load 用 LCEM-GFEM 方法研究爆炸载荷下含缺陷岩石的损伤机理和断裂演化

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-03-25 DOI: 10.1007/s11771-024-5582-y

Yong Chen, Ying-peng Wang, Yu-gui Yang, Wen-kai Sun, Ning-kang Meng

{"title":"Damage mechanism and fracture evolution of rock containing defects with LCEM-GFEM method under explosive load","authors":"Yong Chen, Ying-peng Wang, Yu-gui Yang, Wen-kai Sun, Ning-kang Meng","doi":"10.1007/s11771-024-5582-y","DOIUrl":"https://doi.org/10.1007/s11771-024-5582-y","url":null,"abstract":"Defects in rock masses have significant influence on the fracture propagation during blasting. In this study, a numerical model is developed using the local cohesive element based on the global finite element method (LCEM-GFEM) to simulate the damage evolution and fracturing pattern of rock mass with defects under blasting load. The influence of defect morphology on the stress wave transmission and attenuation is quantified by introducing the energy transfer coefficient. The numerical results show that the defect morphology has prominent influence on the damage characteristics and fracture propagation of rock masses. The merging path of the blast-induced fracture and the derivative fracture shifts from the end to the middle of the defect as the angle of parallel defects increases. The energy transfer coefficient increases with the angle of parallel defects, while the fractal dimension decreases in this case. The number of fractures between the parallel defects and the energy transfer coefficient reduces significantly with the horizontal distance between parallel defects. With the increase of perpendicular distance between the vertical defects, the length of the main horizontal fracture passing through the defect C increases, as well as the energy transfer coefficient and fractal dimension. The numerical results would be beneficial to the understanding of the damage characteristics of defective rock masses under blasting load.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"46 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140300593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of arsenic from arsenic-containing solution in a three-dimensional electrode reactor 在三维电极反应器中去除含砷溶液中的砷

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-03-25 DOI: 10.1007/s11771-024-5587-6

Yong-jian Luo, Yun-yan Wang, Zi-tong He, Huan Xu, Zhu-mei Sun

{"title":"Removal of arsenic from arsenic-containing solution in a three-dimensional electrode reactor","authors":"Yong-jian Luo, Yun-yan Wang, Zi-tong He, Huan Xu, Zhu-mei Sun","doi":"10.1007/s11771-024-5587-6","DOIUrl":"https://doi.org/10.1007/s11771-024-5587-6","url":null,"abstract":"Deep treatment, a method for further reducing the content of a target substance, for toxic arsenic (As) from water is vital to reduce environmental pollution and ensure human health. Here, we employed electrosorption of As(V) from water in a self-made three-dimensional reactor with granular activated carbon (GAC). The As(V) concentration can be decreased from 0.5 to 0.032 mg/L under optimal conditions, and all of the As practically presented as H2AsO4− without As(III), indicating that there was no redox reaction. After kinetic studies and comparisons of pseudo-second-order kinetic, intra-particle diffusion and Boyd models, the electrosorption could be divided into three steps: internal diffusion from the surface of materials to internal pores, liquid film diffusion from the solution to the surface of materials, and the closure of the entire adsorption process to the equilibrium state. In order to verify the cyclic performance of this process, electrosorption-electrodesorption process research was carried out, and it was found that after 8 cycles, the concentration in the effluent was still only 0.098 mg/L, which was lower than the limitation. Above all, both removal efficiency and disposal of adsorption materials should be ameliorated even though As(V) could be removed in depth and recycled.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"26 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140300698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deterioration of compressive properties of coal rocks under water and gas coupling 水与瓦斯耦合作用下煤岩抗压性能的恶化

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-03-25 DOI: 10.1007/s11771-024-5583-x

Ke Lyu, Ning Jiang, Da-wei Yin, Shu-yu Meng, Zhi-you Gao, Tao Lyu

{"title":"Deterioration of compressive properties of coal rocks under water and gas coupling","authors":"Ke Lyu, Ning Jiang, Da-wei Yin, Shu-yu Meng, Zhi-you Gao, Tao Lyu","doi":"10.1007/s11771-024-5583-x","DOIUrl":"https://doi.org/10.1007/s11771-024-5583-x","url":null,"abstract":"The compressive properties of coal under water-gas coupling were studied based on the water-rock-gas coupling test system. The compressive strength and deformation damage characteristics of the coal samples were analyzed, and the macro and fine degradation mechanisms of coal under water-gas coupling were revealed. The compressive strength of the coal samples under the three soaking conditions was reduced compared to that of the dry coal samples. The damage mode of coal samples changed from tensile damage of dry coal samples to mixed shear-tensile damage. Coal samples changed from brittle damage to plastic damage, which increased the range of localization zones and the misalignment of coal samples after soaking. The deterioration effects of coal samples in the three soaking environments were mainly as follows: 1) The intrusion of water and gas led to the decomposition and precipitation of clay minerals inside coal samples; 2) The surface of each group of coal samples showed a deterioration effect after soaking; 3) The deterioration effect of water and gas changed the internal pore structure of coal samples. The destruction of the original supporting structure of the coal samples in the soaked environment reduced the ability of the coal samples to store energy before destruction.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"5 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140300868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Swelling inhibition and infiltration promotion mechanism of polyethyleneimine 聚乙烯亚胺的膨胀抑制和渗透促进机制

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-03-25 DOI: 10.1007/s11771-024-5575-x

Hui-fang Yang, Ao-yang Sha, Zheng-yan He, Ming Wu, Jun Qu, Chen-jie Wu, Zhi-gao Xu, Ru-an Chi

{"title":"Swelling inhibition and infiltration promotion mechanism of polyethyleneimine","authors":"Hui-fang Yang, Ao-yang Sha, Zheng-yan He, Ming Wu, Jun Qu, Chen-jie Wu, Zhi-gao Xu, Ru-an Chi","doi":"10.1007/s11771-024-5575-x","DOIUrl":"https://doi.org/10.1007/s11771-024-5575-x","url":null,"abstract":"In order to solve landslides and slow infiltration rate in in-situ leaching process of weathered crust elution-deposited rare earth ore (WCE-DREO), the swelling inhibition performance and mechanism of polyethyleneimine (PEI) on montmorillonite (MMT) and WCE-DREO were investigated. The swelling inhibition effect on MMT and WCE-DREO increased gradually with increasing concentration of PEI. The leaching efficiency of rare earths was increased from 93.94% to 95.24% by the compound leaching agent consisting of 0.4% PEI and 2% ammonium sulfate compared to 2% ammonium sulfate alone, and the leaching time was reduced by about 33%. PEI can produce a large amount of —NH3+ by hydrolysis, which can neutralize the negative charge on the interlamination and surfaces of clay minerals, reduce the electrostatic repulsion, and weaken the hydration and swelling of clay minerals. A polymeric film was formed on the clay particles by PEI coating, which changed the hydrophilicity of the particle surface, reduced water intrusion. Small particles were agglomerated by the wrapping and linking effects of long-chain PEI, thus increasing the particle size and facilitating the percolation of leaching agent. PEI skeleton also could embed in the clay interlayer and extrude the interlayer water, which inhibits the swelling of clay minerals.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"4 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140301008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of preform structure on mechanical and thermal properties of SiCf/SiC composites 预成型结构对碳化硅/碳化硅复合材料机械性能和热性能的影响

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-02-07 DOI: 10.1007/s11771-023-5495-1

Xu-hui Wang, Zong-xu Wu, Zhao-ke Chen, Yan Wu, Xiang Xiong

{"title":"Effect of preform structure on mechanical and thermal properties of SiCf/SiC composites","authors":"Xu-hui Wang, Zong-xu Wu, Zhao-ke Chen, Yan Wu, Xiang Xiong","doi":"10.1007/s11771-023-5495-1","DOIUrl":"https://doi.org/10.1007/s11771-023-5495-1","url":null,"abstract":"In this paper, SiCf/SiC composites with three kinds of preform structures, namely 2D multilayered, 3D angle-interlock and multiaxis 3D braided, were prepared by chemical vapor infiltration. The influences of preform structure on mechanical and thermal properties of SiCf/SiC composites were discussed in detail, on the basis of comprehensive analyses of fiber arrangement, SiC matrix and pore distribution, and so on. The results show that the mechanical properties and thermal conductivity are comprehensively affected by the fiber arrangement and the density of composites, while the coefficient of thermal expansion is mainly influenced by the fiber arrangement. In addition, the thermal conductivity of 2D multilayered, 3D angle-interlock and multiaxis 3D braided composites could be explained by series model and parallel model, respectively. The continuous three-dimensional network structure of SiC matrix layer inside multiaxis 3D braided composites could be regarded as a fast channel for heat flow, resulting in a higher thermal conductivity. As the temperature increases, the scattering between phonons gradually increases and becomes the main factor affecting the thermal conductivity. In this case, the role of the SiC matrix layer as a fast channel for phonon propagation in multiaxis 3D braided composites gradually weakens.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"2 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Sm content on microstructure and properties of extruded Mg-6Al-2Sr alloy Sm 含量对挤压 Mg-6Al-2Sr 合金微观结构和性能的影响

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-02-07 DOI: 10.1007/s11771-023-5475-5

Hong-xu Liu, Cai-xia Li, Jin-long Xie, Chao Li, Xiao-hua Zhang

{"title":"Effect of Sm content on microstructure and properties of extruded Mg-6Al-2Sr alloy","authors":"Hong-xu Liu, Cai-xia Li, Jin-long Xie, Chao Li, Xiao-hua Zhang","doi":"10.1007/s11771-023-5475-5","DOIUrl":"https://doi.org/10.1007/s11771-023-5475-5","url":null,"abstract":"In this paper, the strengthening mechanism of different Sm content on extruded Mg-6Al-2Sr alloy was studied. The microstructure was observed by metallographic experiment, X-ray diffraction, scanning electron microscopy and transmission electron microscopy, and the effect of Sm content on the microstructure of the alloy was analyzed by EBSD. The main experiment in this paper is the extrusion experiment of Mg-6Al-2Sr cast alloy with different Sm content. The results show that with the increase of Sm content, the generated Al2Sm phase is broken under the action of extrusion, and uniformly dispersed at the grain boundary along the extrusion direction, which hinders the grain growth. However, with the increase of Sm content, the Al2Sm phase increases and aggregates at the grain boundary, which has an adverse effect on the mechanical properties of the alloy. When the Sm content is 1.5 wt%, the average grain size of the alloy is the finest, and its tensile strength, yield strength and elongation reach 297.9 MPa, 257.8 MPa and 21.3%, respectively. The hardness reaches HV78.9, which is 15.6% higher than that of the alloy with 0 wt% Sm content. The yield strength increased by 34.6% and the elongation increased by 34.8%.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"6 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139769319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluid-solid interaction analysis of blood flow in the atherosclerotic carotid artery using the Eulerian-Lagrangian approach 利用欧拉-拉格朗日方法分析动脉粥样硬化颈动脉中的血流流体-固体相互作用

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-02-07 DOI: 10.1007/s11771-023-5395-4

Majid Siavashi, Ava Bina, Mojtaba Sayadnejad, Borhan Beigzadeh

{"title":"Fluid-solid interaction analysis of blood flow in the atherosclerotic carotid artery using the Eulerian-Lagrangian approach","authors":"Majid Siavashi, Ava Bina, Mojtaba Sayadnejad, Borhan Beigzadeh","doi":"10.1007/s11771-023-5395-4","DOIUrl":"https://doi.org/10.1007/s11771-023-5395-4","url":null,"abstract":"This study aims to simulate pulsatile blood flow in the carotid artery with different stenosis severities and pulse rates. The effects of different severities of stenosis, pulse rates, and arterial wall properties on the surrounding fluid are investigated by using fluid-structure interaction (FSI) and arbitrary Lagrangian-Eulerian (ALE) methods. Carreau-Yasuda non-Newtonian and modified Mooney-Rivin hyperelastic models are applied for blood with non-Newtonian behavior and hyperelastic blood vessel’s wall, respectively. Results are presented in terms of wall radial displacement, pressure distribution, the axial velocity profile, and wall shear stress for blood. By increasing the stenosis severities, there would be a change in several parameters. Axial velocity, variation of blood pressure, the maximum wall shear stress, and wall radial displacement experience a growth. Furthermore, when the pulse rate grows in the stenosis severity of 75%, the maximum flow rate moments, maximum values for wall radial displacement, pressure, axial velocity, and wall shear stress increase as well. Using a hyperelastic model for the arterial wall, as opposed to elastic and rigid models, and treating the surrounding fluid as non-Newtonian and unsteady, allows us to achieve a more realistic simulation. In the stenosis having up to 50% of severity, red blood cells are under the enforcement of insignificant damage, while hemolysis is observed in the severe stenosis of 75%. By improving atherosclerosis, which leads to the development of elastic modulus from 500 kPa to 2 MPa, the 65% growth of the maximum value of shear stress at 60 bpm pulse rate and in the stenosis with 75% severity has been noticed. It can be demonstrated that hyperelastic models of the arterial walls lead to lower axial velocity, lower blood pressure, lower shear stress, and higher radial displacement, as opposed to rigid and elastic arterial walls.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"5 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water 用于去除饮用水中硝基苯酚的双模板磁性分子印迹聚合物的制备及其特性

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-02-07 DOI: 10.1007/s11771-024-5565-z

Yi-wen Ouyang, Jian-jun Liang, Xiao-feng Gao

{"title":"Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water","authors":"Yi-wen Ouyang, Jian-jun Liang, Xiao-feng Gao","doi":"10.1007/s11771-024-5565-z","DOIUrl":"https://doi.org/10.1007/s11771-024-5565-z","url":null,"abstract":"In order to efficiently remove 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), 4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers (D-MIPs) were prepared by surface molecular imprinting technology using itaconic acid as functional monomer, Fe3O4@SiO2 as carrier, ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile as initiator. The morphology of D-MIPs was characterized using FT-IR and SEM. The adsorption specificity, regenerability, and applicability of D-MIPs were studied in detail. The results show that D-MIPs successfully coated the surface of the Fe3O4@SiO2 carrier and had a good polymerization effect, specific recognition sites, and good imprinting performance, with a diameter of 90 nm and homogeneous shape. The theoretical adsorption capacities of 4-NP-MIPs, 2, 4-DNP-MIPs, and D-MIPs for target molecules were 103.97, 73.14 and 123.99 mg/g, respectively. There were many adsorption sites with different adsorption energies. D-MIPs reached the optimal adsorption equilibrium state in 30 min. The best fitting models for the MIPs were the Freundlich adsorption and pseudo-second-order kinetic models, indicating that adsorption of MIPs occurred via a chemical adsorption process. Test results show that MIPs had highly specific recognition and selective adsorption capacity in different water samples. After eight regeneration cycles, the adsorption capacity of D-MIPs decreased by 7.51%, confirming that MIPs had excellent regeneration.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"308 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterization of high hard and high tough ultrafine WC ceramics containing hybrid graphene and SiC nanowire 含混合石墨烯和碳化硅纳米线的高硬度、高韧性超细碳化钨陶瓷的制备与表征

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-02-07 DOI: 10.1007/s11771-023-5506-2

Xue-hui Shen, Nan Xu, Hao Su, Xiang-ping He, Jian-qun He

{"title":"Preparation and characterization of high hard and high tough ultrafine WC ceramics containing hybrid graphene and SiC nanowire","authors":"Xue-hui Shen, Nan Xu, Hao Su, Xiang-ping He, Jian-qun He","doi":"10.1007/s11771-023-5506-2","DOIUrl":"https://doi.org/10.1007/s11771-023-5506-2","url":null,"abstract":"The aggregation of low-dimensional nanofillers in the host ceramic matrix significantly discounted their reinforcing efficiency. Herein, employing two-dimensional graphene (G) and one-dimensional SiC nanowire (SiCnw), WC-G-SiCnw ceramic composites were prepared through spark plasma sintering. The effects of sintering temperature, soaking time and pressure on the mechanical properties of the WC-based composites were reported. The influence of graphene and SiCnw on the densification, microstructure and mechanical properties of the ceramic composites were investigated. The experimental results demonstrated that excellent mechanical properties were achieved for WC-0.15 wt.% G–0.45 wt.% SiCnw prepared through sintering at 1900 °C for 15 min holding time and 60 MPa pressure, with a hardness of 25.6 GPa, a flexural strength of 1499 MPa and a fracture toughness of 11.6 MPa·m1/2. The toughening mechanisms were mainly the combination of G and SiCnw induced crack deflection, bridging and pullout. This study provided a simple toughening method in developing high-performance ceramic composites.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"4 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0