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Low-temperature and flexible strategy to in-situ fabricate ZrSiO_(4)-based ceramic composites via doping and tuning solid-state reaction

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Journal of Advanced ceramics 2023年第6期12卷 1238-1257页

作者： Bohan Wang Le Fu Junjie Song Wenjun Yu Ying Deng Guofu Xu Jiwu Huang Wei Xia School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264006China Applied Materials Science Department of Materials Science and EngineeringUppsala UniversityUppsala 75121Sweden

Synthetic zircon(ZrSiO_(4))ceramics are typically fabricated at elevated temperatures(over 1500℃),which would lead to high manufacturing ***,reports about preparing ZrSiO_(4)-based ceramic composites via controlling the solid-state reaction between zirconia(ZrO_(2))and silica(SiO_(2))are *** this work,we proposed a low-temperature strategy to flexibly design and fabricate ZrSiO_(4)-based ceramic composites via doping and tuning the solid-state *** ceramic composites and ZrSiO_(4) ceramics were in-situ prepared by reactive fast hot pressing(FHP)at approximately 1250℃ based on the proposed strategy,i.e.,a ZrSiO_(4)-SiO_(2) dual-phase composite with bicontinuous interpenetrating and hierarchical microstructures,a ZrSiO_(4)-ZrO_(2) dual-phase composite with a microstructure of ZrO_(2) submicron-and nano-particles embedded in a micron ZrSiO_(4) matrix,and ZrSiO_(4) ceramics with a small amount of residual ZrO_(2) *** results showed that the phase compositions,microstructure configurations,mechanical properties,and wear resistance of the materials can be flexibly regulated by the proposed ***,ZrSiO_(4)-based ceramic composites with different properties can be easily fabricated based on different application *** findings would offer useful guidance for researchers to flexibly fabricate ZrSiO_(4)-based ceramic composites at low temperatures and tailor their microstructures and properties through doping and tuning the solid-state reaction.

关键词： zirconia(ZrO_(2))-silica(SiO_(2)) zircon(ZrSiO_(4)) solid-state reaction ceramic composite mechanical properties wear resistance

Enhanced electrical property of graphite/Al_(2)O_(3) composite fabricated by reductive sintering of gel-casted body using cross-linked epoxy polymer

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Journal of Advanced ceramics 2022年第4期11卷 523-531页

作者： Yoshiaki FUNAHASHI Yunzi XIN Kunihiko KATO Huu Hien NGUYEN Takashi SHIRAI Department of Life Science and Applied Chemistry Graduate School of EngineeringNagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan Advanced ceramics Research Center Nagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan

In the present study,graphite/alumina composites are fabricated via reductive sintering of gel-casted green bodies with structurally controlled cross-linked epoxy polymers for the first *** cross-linking degrees of polymers are tuned by the amount ratio of epoxy monomer/polyvinyl alcohol cross-linker utilized in gel-casting *** electrical properties with respect to 5-fold enhanced electrical conductivity and 2-fold higher carrier mobility are successfully achieved in graphite/alumina composite fabricated from cross-linked epoxy polymer,whose phenomenon is attributed to the excellent conductive path in ceramic matrix established by highly uniform network with improved graphitization degree.

关键词： ceramic composite gel-casting reductive sintering cross-linking electrical property graphitization

A New Method to Synthesize Polytitanosilazane as ceramic Precursor

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Chinese Chemical Letters 2003年第12期14卷 1249-1252页

作者： ZhiMinZHENG YongMingLI YongMingLUO ShunXingSU ZhiJieZHANG ShiYanYANG WeiGAO ZeMinXIE StateKeyLaboratoryofEngineeringPlastics CenterforMolecularScienceInstituteofChemistryChineseAcademyofSciencesBeijing100080 StudentofGraduateSchoolofChineseAcademyofSciences Beijing100039

A new kind of polytitanosilazane precursor PTSZ for Si/C/N/Ti-based ceramic was synthesized from the condensation reaction of silazane lithium salt and titanium tetrachloride (TiCl4). The results indicated that the c... 详细信息

关键词： Polytitanosilazane ceramic precursor ceramic composite pyrolysis.

Effects of La_(2)O_(3) addition on microstructure development and physical properties of harder ZTA-CeO_(2) composites with sustainable high fracture toughness

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Journal of Rare Earths 2021年第7期39卷 844-849,I0003页

作者： Zhwan Dilshad Ibrahim Sktani Nik Akmar Rejab Abdul Fatah Zulkarnain Rosli Ali Arab Zainal Arifin Ahmad Department of Mechanical and Energy Engineering Erbil Technical Engineering CollegeErbil Polytechnic UniversityErbil44001Iraq Structural Materials Niche Area School of Materials and Mineral Resources EngineeringEngineering CampusUniversiti Sains Malaysia14300Nibong TebalPenangMalaysia State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The influence of La_(2)O_(3) inclusion(0-3 wt%) on the micro structure,phase formation and mechanical properties of zirconia toughed alumina(ZTA) added with 5.0 wt% CeO_(2) was *** CeO_(2) composites were sintered at 1600℃ for 4 *** microstructure,phase formation,density,fracture toughness and hardness properties were characterised through FESEM,Microscopy Image Analysis Software and XRD diffractometer,Archimedes principle and Vickers indentation technique,*** XRD,image processing and FESEM reveal the existence of LaAl_(11)O_(18).The addition of La_(2)O_(3) incites the sintering,microstructure refinement,densification of ZTA-CeO_(2) matrix and phase ***,the hardness of ZTA-CeO_(2) ceramics is increased rapidly based on refinement of Al_(2)O_(3) grains,densification of ZTA-CeO_(2) composites and porosity *** is observed that the fracture toughness is enhanced through in situ formation of elongated LaAl_(11)O_(18) *** addition of 0.7 wt% La_(2)O_(3) culminated in the achievement of the optimum findings for density(4.41 g/cm^(3)),porosity(0.46%),hardness(1792 HV) and fracture toughness(8.8 MPa·m^(1/2)).Nevertheless,excess La_(2)O_(3) is proven to be detrimental as it displays poor mechanical properties due to the poor compactness of numerous LaAl_(11)O_(18) grains,coarsening of Al_(2)O_(3) grains and decline in density.

关键词： ZTA-CeO_(2) ceramic composite Microstructural design Fracture toughness Vickers hardness Rare earths

Sintering, thermal stability and mechanical properties of ZrO2-WC composites obtained by pulsed electric current sintering

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Frontiers of Materials Science 2011年第1期5卷 50-56页

作者： Shuigen HUANG Kim VANMEENSEL Omer VAN DER BLEST Jozef VLEUGELS Department of Metallurgy and Materials Engineering Katholieke Universiteit Leuven Kasteelpark Arenberg 44 B-3001 Heverlee Belgium

ZrO2-WC composites exhibit comparable mechanical properties as traditional WC-Co materials, which provides an opportunity to partially replace WC-Co for some applications. In this study, 2 mol.% Y2O3 stabilized ZrO2 composites with 40 vol.% WC were consolidated in the 1150℃-1850℃ range under a pressure of 60 MPa by pulsed electric current sintering （PECS）. The densification behavior, microstructure and phase constitution of the composites were investigated to clarify the role of the sintering temperature on the grain growth, mechanical properties and thermal stability of ZrO2 and WC components. Analysis results indicated that the composites sintered at 1350℃ and 1450℃ exhibited the highest tetragonal ZrO2 phase transformability, maximum toughness, and hardness and an optimal flexural strength. Chemical reaction of ZrO2 and C, originating from the graphite die, was detected in the composite PECS for 20 min at 1850℃ in vacuum.

关键词： ceramic composite pulsed electric current sintering (PECS) grain size,mechanical property

Effect of Thermal Treatment on Microstructure and Phase of Partially-stabilized Zirconia

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 483-486页

作者：胡永刚肖建中 XIA Feng ZHANG Haibo College of Material Science and Engineering Huazhong University of Science and Technology

ZrO2-MgO-YzO3-CaO-Al203 composites with a multiphase microstructure were fabricated by die pressing process and sintered at various thermal programs. The microstructure of this polycrystalline was examined to clarify the role of A1203 on grain growth. Environmental scanning electron microscopy （ESEM） micrographs revealed that spinel was beneficial to refine grain. The effect of thermal treatment on the formation of monoclinic phase was discussed. It can be found that, the grain size and the fraction of the monoclinic phase in this partially stabilized zirconia（PSZ） increases after heat treatment at 1 150 ℃. The temperature of heat- treatment, not the time for holding, is the governing factor of the fraction of monoclinic phase.

关键词： ceramic composite PSZ phase assemblage microstructure

Microstructure and Mechanical Properties of Hot Pressed TiB_2-ZrO_2 composites

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Journal of Iron and Steel Research(International) 1996年第2期3卷 35-37页

作者： Ge Qilu Han Huanqing Liang Xiaoying Wu Wenfang Wu Weihang Central Iron & Steel Research Institute MMI Harbin Institute of Technology

The partially stabilized ZrO2 (PSZ) particles were introduced into TiB2 ceramics to improve its density and mechanical properties. The results show that the addition of PSZ is very effective not only in bettering the ... 详细信息

关键词： ceramic composite TiB_2 ZrO_2 microstructure mechanical property

MICROSTRUCTURE AND FRACTURE FEATURE OF ZTA-SiC_W composite

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Acta Metallurgica Sinica(English Letters) 1990年第9期3卷 200-206页

作者： ZHANG Jinsong XIA Fei LUO Chuan CAO Lihua ZHAO Kuanfang HU Wanping Institute of Metal Research,Academia Sinica,Shenyang,China ZHANG Jinsong Research Assistant,Institute of Metal Research,Academia Sinica,Shenyang 110015,China

A ZTA-SiC_W ceramic composite of room temperature strength 935—1110 MPa and frac- ture toughness 9.7MPa·m^(1/2) was prepared using the sol-gel *** microstructure and fracture feature have been examined by means of X-ray diffraction analysis and electron mi- croscope *** results show that the whiskers are well dispersed and the matrix has an obvious texture *** the whisker and matrix,there is a great number of transcrystalline and transcrystalline connective relation other than part of conventional polycrystalline connective *** secondary cracks closely related with local whisker group are found on the fracture *** may be a new reinforcing and toughening mecha- nism by whisker group,of which the whiskers in the local whisker group arrest synergetically the crack propagation accompaning with the formation of secondary cracks.

关键词： ceramic composite microstructure fracture

In-situ Synthesis and Densification of B4C-（Zr,Ti）B2 composites by Pulsed Electric Current Sintering

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Journal of the Chinese ceramic Society 2014年第2期 113-121页

作者： HUANG Shuigen VANMEENSEL Kim VLEUGELS Jozef Department of Materials Engineering KU LeuvenKasteelpark Arenberg 44-Bus 2450B-3001 HeverleeBelgium

B4C composites with 30 vol.%dispersed ultrafine grains of ZrB2,TiB2and(Zr0.5Ti0.5)B2were prepared via pulsed electric current sintering of B4C,ZrO2,TiO2and carbon black as mixed starting powders in vacuum at 2 000 ℃.The full-densification was obtained when an optimized synthesizing and sintering cycle at the maximum pressure of 30 MPa was applied after the completion of the in-situ powder synthesis,allowing the degasification of volatile *** influence of sintering temperature on the phase constitution and microstructure during in-situ synthesis and densification was investigated in the interrupted sintering cycles at 1 400 and 2 000℃.According to the analysis by electron probe microanalysis and X-ray diffraction,the in-situ conversion of TiO2/ZrO2to TiB2/ZrB2is a complex process in which TiO2/ZrO2is initially converted to TiB2/ZrB2with the formation of B2O3as an intermediate product at a low *** 2 000 ℃,B2O3reacts completely with C to form B4C and CO.A solid solution boride phase of(Zr0.5Ti0.5)B2is formed when two oxides are used in a 50/50 molar ratio.

关键词： boride ceramic composite in-situ synthesis spark plasma sintering grain size