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Preparation of ZrB_2 Ceramics by Self-propagating High-temperature Synthesis and hot pressing sintering

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Journal of Wuhan University of Technology(Materials Science) 2005年第4期20卷 87-89页

作者：方舟 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ZrB2 ceramics were prepared by self-propagating high-temperature synthesis（SHS） and were sintered by hot pressing（HP）.The effects of the granularities and doses of raw materials in Zr-B2O3-Mgon SHS process and product were *** and combustion temperature curves prove that the ideal SHS reactants of Zr-B2O3-Mg are 50μm Zr powder,75μm B2O3 powder and 400μm Mg powder with 45% *** particle sizes of SHS product,acid-leached product,sintered product are 2-5μm,0.5-2μm,2-10μm *** analysis indicates that the acid-leached product consists of ZrB2（94.59%）,ZrO2（3.87%）,and H3BO3（1.54%）,The sintered product has a relative density of 95.4%.

关键词： zirconium diboride self-propagating high-temperature synthesis hot pressing sintering

Fabrication and Mechanical Properties of SiC/Cu Composites with Zn Addition by hot pressing sintering

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Fabrication and Mechanical Properties of SiC/Cu Composites w...

Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure

中国材料大会2012

作者： Huang Liu Guoqiang Luo Pingan Chen Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

ISBN: (纸本)9783037856079;3037856076

SiC/Cu composites exhibit low density, low coefficient of thermal expansion and excellent mechanical properties. In this study, Zn of 2 wt. % was added as the sintering activator, and the high volume faction （60%） SiC/Cu composites was fabricated by hot pressing sintering technology. The phase composition and morphology of as-prepare samples were characterized by X-ray diffraction （XRD） system and scanning electron microscopy （SEM） equipped with an energy-dispersive spectroscopy （EDS） system. The as-prepared SiC/Cu composites were dense and uniform as well as void free. The results show that SiC/Cu composites can reach excellent mechanical properties of SiC/Cu composites. With the increase of sintering temperature, Vickers hardness and the bending strength of the samples increased obviously and the as-prepared SiC/Cu composites achieved a maximum Vickers hardness and bending strength respectively of 195MPa and 140MPa.

关键词： SiC/Cu Composite hot pressing sintering Mechanical properties Interface.

来源： cnki会议评论

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cnki会议

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 825-833页

作者： Chongfeng Sun Shengqi Xi Xiaofeng Dang Jianping Li Yongchun Guo Zhong Yang Yaping Bai School of Materials and Chemical Engineering Xi'an Technological UniversityXi'an 710021China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

In this paper,microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering *** resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further *** the mechanical alloying process,Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders mainly composed of metastable ferrite phase are obtained after mechanical alloying for 8,16 and 24 h,*** the subsequent hot pressing sintering process,the phase transitions(from ferrite to austenite)occur from 650 to 750°C for Fe-19 wt%Cr-9 wt%Ni alloy powders milled for 24 *** the sintering temperature is raised to 1050°C for 1 h,the ferrite phase has transformed into austenite phase completely,and the obtained grain size of sintered Fe-19 wt%Cr-9 wt%Ni alloy is around 40 *** test of the sintered Fe-19 wt%Cr-9 wt%Ni alloy has been operated in 0.5 mol L^(-1) H_(2)SO_(4) solution to show the corrosion resistance *** show that the sintered Fe-19 wt%Cr-9 wt%Ni alloy exhibits excellent corrosion resistance,which is proved by higher self-corrosion potential,lower self-corrosion current density and larger capacitive reactance,compared with that of commercial 304 stainless steel.

关键词： Mechanical alloying hot pressing sintering Nanocrystalline alloy Phase transition Corrosion resistance

In Situ Reaction Strengthening and Toughening of B_(4)C/TiSi_(2)Ceramics

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 12-19页

作者：夏涛涂晓诗张帆 ZHANG Jinyong REN Lin Hubei Longzhong Laboratory Wuhan University of TechnologyXiangyang Demonstration ZoneXiangyang 441000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Science Wuhan University of TechnologyWuhan 430070China

B_(4)C-SiC-TiB_(2)ceramics were prepared by in situ reactive hot-pressing sintering with TiSi_(2)as an *** reaction pathways of TiSi_(2)and B_(4)C were *** sintering was found to be a multistep *** reaction started at approximately 1000℃,and TiB_(2)was formed *** of Si and C started to react at 1300℃,and the unreacted Si melted at 1400℃to form a liquid ***_(2)predominantly affected the intermediate sintering process of B_(4)C and increased the sintering *** to the unique reaction process of TiSi_(2)and B_(4)C,a large number of aggregates composed of SiC and TiB_(2)were *** results showed that composite ceramics with the optimal flexural strength of 807 MPa,fracture toughness of 3.2 MPa·m1/2,and hardness of 32 GPa,were obtained when the TiSi_(2)content was 10 wt%.

关键词： in situ reaction hot pressing sintering TiSi_(2) B_(4)C composite ceramics reaction mechanism

Fabrication and Microstructure of BN Matrix Composites with Electrical Conductivity

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Journal of Wuhan University of Technology(Materials Science) 2002年第3期17卷 5-7页

作者：王为民 Bornin1966

BN ceramic is an advanced engineering ceramics with excellent thermal shock resistance, good workability and excellent *** 2 ceramic has excellent electric conductivity,high melting points, and corrosion resistance to molten ***,the composite consisting of BN and TiB 2 ceramics is expected to have a combination of above mentioned properties,thereby can be used as self heating *** this paper,hot pressing technology was used to fabricate the high performance BN TiB 2 composite *** and electric conducting mechanism were studied,and the relationship between the microstructure and physical property was *** results show that the microstructure of composites has a great influence on the physical property of *** BN TiB 2 composites with excellent mechanical strength and stable resistivity can be obtained by optimizing the processing parameter and controlling the microstructure of composites.

关键词： BN TiB 2 composites hot pressing sintering microstructure physical property electric conduct mechanism

Effect of Powder Particle Size on Microstructure and Mechanical Property of Ni-Based P/M Superalloy Product

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Journal of Iron and Steel Research International 2003年第3期10卷 71-74页

作者： ZHANG Ying ZHANG Yi-wen ZHANG Feng-ge TAO Yu CHEN Xi-chun Central Iron and Steel Research Institute

The solid sintering behavior and mechanical properties of Fe Ni powders prepared by mechanical alloying of elemental powders and hot pressing sintering in vacuum atmospheres were investigated. It was observed that the microstructure of the powder particles evolves in three stages. The alloy powder with average grain size of 20-30 nm was obtained. The sinter densification depends crucially on the particle rearrangement and the large amount of internal strain introduced during milling. The theoretical density of over 95 % was obtained after hot pressing sintering at 800 ℃ for 30 min with pressure of 50 MPa. No significant grain growth was observed during sintering. And also relatively high hardness was obtained.

关键词： mechanical alloying nanostructured material mechanical property hot pressing sintering

Formation and sintering Behavior of Nanocrystalline Fe-Ni Powder by Mechanical Alloying

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Journal of Iron and Steel Research International 2003年第3期10卷 75-78页

作者： CHEN Wen-ge GU Chen-qing DING Bing-jun Xi'an University of Technology Xi'an Jiaotong University

The solid sintering behavior and mechanical properties of Fe-Ni powders prepared by mechanical alloying of elemental powders and hot pressing sintering in vacuum atmospheres were investigated. It was observed that the microstructure of the powder particles evolves in three stages. The alloy powder with average grain size of 20-30 nm was obtained. The sinter densification depends crucially on the particle rearrangement and the large amount of internal strain introduced during milling. The theoretical density of over 95 % was obtained after hot pressing sintering at 800 ℃ for 30 min with pressure of 50 MPa. No significant grain growth was observed during sintering. And also relatively high hardness was obtained.

关键词： mechanical alloying nanostructured material mechanical property hot pressing sintering