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Microstructure and Mechanical Properties of TiB_2/(Ni+Mo) Composites Fabricated by Hot Pressing

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Journal of Materials Science & Technology 2000年第6期16卷 634-636页

作者： Jinyong ZHANG , zhengyi fu Wuhan Univ. of Technol. Wuhan 430070 China

The fabrication of TiB2 ceramics with high performance at a relatively low temperature requires a second phase to assist the densification and control the microstructure. Moreover the interface characteristics of composites must also be considered. Nickel was chosen as a good metallic-bearing additive in this study. In order to optimize the interface, Mo was added. The results show that Mo can affect the interreaction between TiB2 and Ni, and metallic liquid plays an important role in limiting the TiB2 grain growth in sintering.

关键词： NiMo Composites Fabricated by Hot Pressing Microstructure and Mechanical Properties of TiB2 Ni+Mo TiB

4D printing for future manufacturing

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Science China Materials 2023年第11期66卷 4517-4518页

作者： Chaolin Tan Ji Zou zhengyi fu Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A*STAR)Singapore 636732Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Additive manufacturing(AM),also called three-dimensional(3D)printing,offers disruptive design freedom and manufacturing flexibility due to the layer-wise incremental formation manner of *** in AM techniques provide unique advantages and feasibilities for overcoming challenges arising from fabricating parts with complexities in geometry,materials,and properties.

关键词： printing properties freedom

Microstructure and Mechanical Property of (TiNbTaZrHf)C Synthesized by In-situ Reaction

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Journal of Wuhan University of Technology(Materials Science) 2022年第2期37卷 177-183页

作者： ZHOU Qing ZHANG Jinyong fu zhengyi WANG Dangqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The(TiNbTaZrHf)C high entropy carbide(HEC)was successfully synthesized by complete commercial transition metal powders,obtained fine sintered bulks without additives by in-situ reaction element synthesis method.(TiNbTaZrHf)C bulk shows a face centered cubic rock salt structure with homogeneous single-phase FCC structure in composition and *** optimum sintering temperature is about 1900℃at which the best mechanical properties are *** mechanical properties of(TiNbTaZrHf)C ceramic block are better than those of binary transition metal carbides,and it has obvious high entropy *** a small amount of Al as sintering additive,the mechanical properties of(TiNbTaZrHf)C ceramics continue to improve,the bending strength of the samples at each temperature is increased by at least 38%,and the highest is 486 *** elastic modulus and hardness of the sample at 1900℃are also slightly increased by 4%and 14%,*** above conclusions illustrate that the properties of high entropy ceramics are greatly improved by in-situ reaction sintering.

关键词： high entropy carbide in-situ reaction microstructure mechanical property sintering additive

STUDY ON PCT CURVE FOR Zr-Ni HYDROGEN STORAGE AMORPHOUS ALLOY

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Journal of Wuhan University of Technology(Materials Science) 1999年第4期14卷 53-56页

作者： ZHANG Dongming fu zhengyi Wuhan University of Technology Wuhan University of Technology China State Key Lab Adv. Technol. Mat. S. Wuhan University of Technology Wuhan 430070 China

Based on the comprehensive analysis of hydrogen storageexperimental results for Zr-Ni amor- phous alloy, the quantitativerelationship of PCT curve was established, the calculated results areconsistent with experimenta... 详细信息

关键词： quantitative relationship PCT curve amor phous alloy

Novel synthesis approaches for new structures in confined space inspired by natural structure-forming processes

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Journal of Materiomics 2017年第2期3卷 83-95页

作者： Hang Ping Hao Xie zhengyi fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineeringand Life ScienceWuhan University of TechnologyWuhan430070China

In living organisms,confined space with specific chemical composition and elaborate spatial distribution regulates the formation of natural *** from the natural structure-forming process,novel synthesis approaches in deliberated confined systems have been proposed for obtaining designed *** confined systems can effectively regulate the synthesis of materials with defined structures according to the geometry of *** fibrils provide biological confinements for the formation of hierarchical structure with periodic *** engineered living organisms with designed confinements can direct the synthesis of three-dimensional *** novel structures will be rationally fabricated in the future with the aid of deeper understanding of biological processes.

关键词： Bioprocess-inspired fabrication Natural structure-forming processes Confined space New structures

Effects of Al Addition on the Microstructure and Properties of Nb/Nb_5Si_3 in situ Composites Fabricated via Spark Plasma Sintering

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 1036-1038页

作者：龙文元 YAO Junping fu zhengyi College of Aeronautical Manufacuring Engineering Nanchang Hangkong University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Dense Nb/Nb5Si3 composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructttres of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3 phase. The microstructure of the Nb/ Nb5Si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in AI additions. The Rockwell hardness of Nb-20Si is 60HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the Nb/NbsSi3 in situ composites significantly improved with the increase in Al addition.

关键词： spark plasma sintering Nb/Nb5Si3 composites oxidation resistance microstructure

Ultra-fast densification of CNTs reinforced alumina based on combustion reaction and quick pressing

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Science China(Technological Sciences) 2012年第2期55卷 484-489页

作者： fu zhengyi HUANG LiWei ZHANG JinYong TODD Richard State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials University of OxfordOxford OX13PHUK

An ultra-fast densification method based on high heating rate from the combustion reaction for producing carbon nanotubes （CNTs） reinforced alumina ceramics is reported. The heat generated by combustion reaction is adopted to act as a high temperature source to the sample, which results in a heating rate of 1660℃/min of the sample. Then a great mechanical pressure is applied to the sample when the sample gets the expected temperature. The densification process is finished in several minutes. The results indicate that the densification method is beneficial to protect the CNTs from destruction and creates good interracial combination between the nanotubes and the matrix. With the addition of 1 wt% CNTs, the fracture toughness of the ceramics prepared increases about 50%.

关键词： carbon nanotubes alumina combustion reaction quick pressing

In-situ synthesis and sintering of mullite glass composites by SPS

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Journal of Advanced Ceramics 2014年第2期3卷 165-170页

作者： Jinyong ZHANG Hai ZHAN zhengyi fu Richard TODD State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials University of OxfordOxfordUK

The main subject of this work is an investigation of the effects of heating rate and current on the crystallisation of amorphous precursors in spark plasma sintering(SPS).For this,dry gel of Al_(2)O_(3)-SiO_(2) with a molar ratio of 1:1,was synthesized and sintered in-situ by SPS,and also by hot pressing(HP)for *** analysis showed that the only crystalline product in both cases was mullite,whose Al_(2)O_(3) content was lower in the SPS *** microstructures showed a low volume fraction of large mullite fibers in the SPS specimens,whereas a high volume fraction of fine equiaxed grains was present in the HP *** main difference in microstructure between HP and SPS specimens could be explained in terms of the higher heating rate of the SPS *** size of the SPS die also affected the size and aspect ratio of the mullite fibers produced,which might have been due to either the different electrical current required or a difference in specimen temperature profile.

关键词： spark plasma sintering(SPS) synthesis extra-field mullite

Thermodynamics aided design of hBN-capsulated diboride powders from novel nitrate precursors for high entropy ceramics

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Journal of Materials Science & Technology 2024年第11期178卷 133-142页

作者： Hailing Yang Ji Zou Zhimin Xiong Jingjing Liu Weimin Wang zhengyi fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

Hexagonal BN-coated powders have been widely used in various engineering sectors,however,their pro-ductions are restricted by the complexity of gas-solid *** this study,guided by thermodynamics,a novel approach to synthesize Layer-structured hexagonal BN(hBN)-coated high entropy diboride pow-ders in vacuum was developed,using metal salt Zr(NO_(3))4·5H_(2)O,HfCl_(4),NbC_(15),TaC_(15),C_(16)H_(36)O_(4)Ti,boric acid,and sucrose as raw *** adjusting the ratio of carbon to metal source(C/M),powders only consisting of two boride solid solutions and hBN were finally obtained,under an optimal process-ing condition of C/M=5.5 and synthesis temperature of 1400 ℃.Parts of hBN were found to coat on high-entropy metal diborides ceramic(HEB)particles,corresponding formation mechanism for core-shell structured powders was investigated,together with the liquid precursor assisted boro/carbothermal re-duction *** from as-synthesized core-shell powders,(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B2-11 vol%hBN ceramics were densified at 1900 ℃ under 50 MPa without holding,with a high relative density of 97.3%.

关键词： High entropy boride Boro/carbothermal reduction Sol-gel Core-shell powders Densification