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Effect of Particle Size on Silicon Nitride Ceramic Slurry by Stereolithography

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 514-519页

作者：汪春柳 zhang jinyong 雷丽文 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070China

The effects of particle size,gradation and solid loading of silicon nitride (Si_(3)N_(4)) on the rheological behavior and curing properties of ceramic slurry are studied by stereolithography (SLA).The results show that the particle size of Si_(3)N_(4) powder has a signif icant influence on the rheological properties and stability of the *** m_(D50=1.3μm):m_(D50=2.3μm)=3:7,the slurry viscosity is low and the sedimentation is *** most important thing is that with the increase of the solid loading of the slurry,the viscosity of the slurry increases,the stability becomes higher,and the curing thickness *** curing thickness of Si_(3)N_(4) ceramic slurry with solid loading of 50 vol% can reach nearly 50μ*** above results finally show that the process optimizes the formulation of the slurry in rheological and curing properties.

关键词： silicon nitride stereolithography dispersion stability

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

Effect of Composite Composition on the Contact Angle of B_(4)C-xTiB_(2)/Cu

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1116-1120页

作者： HU Dong zhang Xin zhang jinyong LEI Liwen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070China

The wetting behavior of molten Cu on the B_(4)C-xTiB_(2)ceramic composites was investigated in this *** results show that the contact angle of molten Cu alloy on B_(4)C-TiB_(2)ceramic composites is linear with the composition rate of TiB_(2)or B_(4)C while the temperature is in the range of 1300 to 1350℃,consistent with the expectation of the commonly used theoretical ***,a nonlinear relationship between the contact angle and the composition rate unexpectedly occurred at temperatures ranging from 1400 to 1500℃.The big difference of the contact angles between the molten metal and the components in the composites was found to be the key *** result identifies that the commonly used theoretical method only works at a limited difference of the contact angle of the liquid on the different phases in the composites,and fails at a big difference.

关键词： wetting B_(4)C-TiB_(2) composites interfacial reaction

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

Preparation and Composition Distribution in Hollow Tubular TiB-Ti Composites during Centrifugal Spraying Process

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 518-524页

作者： zhang Zhongren DU Runkun zhang Fan zhang jinyong LEI Liwen WANG Wei School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China

The hollow cylinders of TiB-Ti composites with a gradient distribution of Ti phase were synthesized by the combination of traditional slurry spray with centrifugal forming *** influences of the concentration of sodium hexametaphosphate(SHMP),the concentration of polyvinyl alcohol(PVA)and solid content(20 vol%-35 vol%)on the rheological properties of the TiB_(2)-Ti composite slurries were *** with low viscosity,weak thixotropy and shear-thinning behaviour were obtained for facilitating the slurry spraying *** effects of different centrifugal conditions on the migration of components during the forming process were *** phase composition and the elements distribution of the prepared samples were characterized by the energy-dispersive X-ray *** observations revealed that the samples fabricated at 1500 r/min for 3 min had a significant composition *** two-phase systems with small density differences and large particle size variation,centrifugal time was more important than centrifugal speed in forming a continuous gradient structure.

关键词： hollow tubular TiB-Ti composites centrifugal spraying process rheological properties composition distribution

In-situ Preparation of TiB_2-TiB-Ti Functionally Graded Materials by Improved Sintering Process

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 710-714页

作者：刘国玺 LI Kezhi zhang jinyong 张帆 School of Materials Science Northwestern Polytechinical University Ningbo Branch of Ordnance Science Institute of China State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

An improved multi-step sintering process was used to in-situ prepare TiB2-TiB-Ti FGMs. According to the sintering temperatures, the functionally graded materials （FGMs） were divided into three sections. After sintering at a proper temperature, the three sections were sintered together in turn. The experimental results showed that there were no obvious pores and cracks in the whole TiB2-TiB-Ti FGMs, and no delamination was found in the impacting test with good performance features, which indicated that there were no interface effects in FGMs during penetration, so that the TiB2-TiB-Ti FGMs were an ideal FGM.

关键词： FGMs TiB2 Ti Fabrication

High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen zhang Fan zhang jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

Fabrication of laminated TiB2-B4C/Cu-Ni composites by electroplating and spark plasma sintering

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Journal of Materials Science & Technology 2017年第10期33卷 1172-1176页

作者： Ziyi Wu jinyong zhang Taojie Shi Fan zhang Liwen Lei Han Xiao Zhengyi Fu State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

We proposed a new method, electroplating followed by spark plasma sintering（SPS）, to fabricate laminated TiB2-B4 C/Cu-Ni composites with high strength and high toughness. It is found that a thin intermediate Cu layer can effectively enhance the strength of the interface between the ceramics and the metals, resulting in a high flexural strength and toughness of the laminated TiB2-B4 C composites simultaneously. A flexural strength and fracture toughness of 651 MPa and 11.6 MPam^（1/2） respectively,are achieved, an approximately 90% improvement over TiB2-B4 C bulk.

关键词： Laminated structure Electroplating Spark plasma sintering B4C ceramic