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Ti/Al_2O_3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process

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Journal of Materials Science & Technology 1999年第3期15卷 271-275页

作者： Yimin LI(powder metallurgy research institute, central-south university of Technology, changsha 410083, china)Ziqiao ZHENG(Department of Materials Science and Engineering, central-south university of Technology, changsha 410083, china) powder metallurgy research institute Central-South University of Technology Changsha 410083 China Department of Materials Science and Engineering Central-South University of Technology Changsha 410083 China

Ti1Al2O3 Functionally Gradient Material (FGM) was prepared by an explosive compaction/SHS process. Ten sheets of the compounding powder were laminated and pressed to get a green body of FGM. It was then compacted explosively By burying the explosive compaction body into a stoichiometric Al/TiO2 mixture and igniting the combustion of the stoichiometric Al/TiO2 mixture, the SHS reaction of the explosive compaction body was initiated by the heat released from the combustion of the stoichiometric Al/TiO2 mixture. In this way, Ti/Al2O3 FGM was synthesized. The adiabatic temperatures of each gradient layer were calculated when the preheating temperatures were 298 K and 1173 K, respectively The microstructure, composition and properties of Ti/Al2O3 FGM and the reaction mechanism of each gradient layer were studied. It was found that Ti/Al2O3 FGM prepared by the explosive compaction/SHS process had a high density and a high microhardness. Its structure, composition and properties showed apparent gradient distribution. The structure of the standard stoichiometric ratio gradient layer of FGM was a network structure. Its reaction mode could be described as follows: Al powder melted first, then the molten Al penetrated into the TiO2 zone and reacted with TiO2, and big pores were left in the original positions of Al powder. The reaction of gradient layers with the addition of Al3O3 as diluents was similar to that of the standard stoichiometric ratio gradient layer, so were their structure and composition. However, the reaction of gradient layers with the addition of Ti as diluents was more complex and the composition deviated slightly from the designed one

关键词： Al SHS Ti/Al2O3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process

Abnormal gradient microstructure in Cr_3C_2 based cemented carbide

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Journal of central south university of Technology 2001年第4期8卷 224-227页

作者： ZHANG Li 1,CHEN Shu 2 (1. powder metallurgy Factory, central south university, changsha 410083, china 2. changsha research institute of Mining and metallurgy, changsha 410012, china) powder metallurgy Factory Central South University Changsha China changsha research institute of Mining and metallurgy Changsha China

With OLYMPUS PMG3 metallograph, an abnormal three-layer gradient structure, i. e. coarse grain zone, binder enrichment zone and normal structure zone from surface to inner, was observed in Cr3C2 based cemented carbide. In the binder enrichment zone, three different shapes of anomalous coarse carbides were observed. It is shown that the transverse rupture strength can be raised remarkably, up 20.7%from the alloy with abnormal gradient structure by removing the abnormal gradient structure. The results suggested that the abnormal gradient structure in the surface, especially the anomalous coarse carbides in the binder enrichment zone is the main reason for the lower strength

关键词： Cr3C2 based cermet cemented carbide gradient structure microstructure

Development of Novel Binder for Hardmetal powder Extrusion Molding

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Journal of Materials Science & Technology 2002年第6期18卷 569-571页

作者： Jicheng ZHOU and Baiyun HUANGState Key Laboratory for powder metallurgy, central south university , changsha 410083, china Lab. for Power Metall. Central South Univ. Changsha 410083 China

A novel binder system for hardmetal powder extrusion moulding (PEM) process has been developed. The binder system comprises a major fraction of a mixture of low molecular weight components (LMWCs) and a minor fraction of very finely dispersed polymer. The feedstocks are mixed as a thick slurry at a suitable temperature and are rapidly homogenized by stirring at an adequate shear force. The binders are removed by thermal debinding. The thermal debinding mechanism has been investigated by thermogravimetry (TG) and differential thermogravimetry (DTG). At the first stage of debinding, the LMWCs are removed. These open up pore channels which allows much faster removal of the remaining polymer component during the subsequent stage. The microstructures of the moulded green parts were observed by scanning electron microscopy (SEM). The debound samples were sintered at different temperatures, and the sintered samples properties were measured.

关键词： Binder Thermal debinding Hardmetal powder extrusion moulding

MEASUREMENT　AND　INFLUENCE　FACTOR＇S　ANALYSING　OF　INTERFACIAL　STRENGTH　OF　COMPOSITES

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中国有色金属学会会刊：英文版 1996年第3期6卷 74-78页

作者： Wang Lingsen Liu Ruoyu Zang Jinsen Fan Yi (research institute of powder metallurgy, central south university of Technology, changsha 410083) research institute of powder metallurgy Central South University of Technology Changsha 410083 China

ＭＥＡＳＵＲＥＭＥＮＴＡＮＤＩＮＦＬＵＥＮＣＥＦＡＣＴＯＲ＇ＳＡＮＡＬＹＳＩＮＧＯＦＩＮＴＥＲＦＡＣＩＡＬＳＴＲＥＮＧＴＨＯＦＣＯＭＰＯＳＩＴＥＳ￥ＷａｎｇＬｉｎｇｓｅｎ；ＬｉｕＲｕｏｙｕ；ＺａｎｇＪｉｎｓｅｎ；Ｆａ... 详细信息

ＭＥＡＳＵＲＥＭＥＮＴＡＮＤＩＮＦＬＵＥＮＣＥＦＡＣＴＯＲ＇ＳＡＮＡＬＹＳＩＮＧＯＦＩＮＴＥＲＦＡＣＩＡＬＳＴＲＥＮＧＴＨＯＦＣＯＭＰＯＳＩＴＥＳ￥ＷａｎｇＬｉｎｇｓｅｎ；ＬｉｕＲｕｏｙｕ；ＺａｎｇＪｉｎｓｅｎ；ＦａｎＹｉ（ＲｅｓｅａｒｃｈＩｎｓｔｉ...

关键词： composites interfacial strength SiC fiber

Direct Electrodeposition of Cu-Ni-W Alloys for the Liners for Shaped Charges

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Journal of Materials Science & Technology 2010年第5期26卷 429-432页

作者： Hanwei He and Shouya Jia State Key Lab of powder metallurgy,central south university,changsha 410083.china State Key Lab of powder metallurgy Central South University Changsha 410083 China

The Cu-Ni-W alloys for the liners for shaped charges were successfully prepared by direct current（DC） *** influence of cathode current density on morphology,microstructure and composition of the Cu-Ni-W alloys was investigated by means of scanning electron microscopy（SEM）,X-ray diffraction（XRD） and energy dispersive spectrometry（EDS）.With the increasing of current density,the copper content reduces gradually and the nickel and tungsten content increase; the crystallite size is *** the current density is 15 A/dm 2 the tungsten content reaches 12.96 wt pct,and the crystallite size is submicron *** Cu-Ni-W alloy is face-centered cubic（fcc） solid *** of the Cu-Ni-W alloys take on（220） texture.

关键词： Electrodeposition Cu-Ni-W alloy Cathode current density

MECHANICAL PROPERTIES IMPROVEMENT OF TiAl BY MICROSTRUCTURE REFINING

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中国有色金属学会会刊：英文版 1995年第4期5卷 79-83页

作者： Huang Baiyun He Yuehui Kong Gaoning Qu Xuanhui(powder metallurgy research institute,central south university of Technology,changsha 410083) central south Univ of Technology Changsha China

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＩＭＰＲＯＶＥＭＥＮＴＯＦＴｉＡｌＢＹＭＩＣＲＯＳＴＲＵＣＴＵＲＥＲＥＦＩＮＩＮＧＨｕａｎｇＢａｉｙｕｎ；ＨｅＹｕｅｈｕｉ；ＫｏｎｇＧａｏｎｉｎｇ；ＱｕＸｕａｎｈｕｉ（Ｐｏｗｄ... 详细信息

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＩＭＰＲＯＶＥＭＥＮＴＯＦＴｉＡｌＢＹＭＩＣＲＯＳＴＲＵＣＴＵＲＥＲＥＦＩＮＩＮＧＨｕａｎｇＢａｉｙｕｎ；ＨｅＹｕｅｈｕｉ；ＫｏｎｇＧａｏｎｉｎｇ；ＱｕＸｕａｎｈｕｉ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａ...

关键词： intermetallic compounds mechanical properties microstructure

ROOM-TEMPERATURE MECHANICAL PROPERTIES OF TiAl+Ce ALLOYS

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中国有色金属学会会刊：英文版 1996年第3期6卷 146-149页

作者： Chen Shiqi Qu Xuanhui Huang Baiyun Lei Changming(powder metallurgy research institute,central south university of Technology, changsha 410083) powder metallurgy research institute Central South University of Technology Changsha 410083 China

ＲＯＯＭ－ＴＥＭＰＥＲＡＴＵＲＥＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＴｉＡｌ＋ＣｅＡＬＬＯＹＳ￥ＣｈｅｎＳｈｉｑｉ；ＱｕＸｕａｎｈｕｉ；ＨｕａｎｇＢａｉｙｕｎ；ＬｅｉＣｈａｎｇｍｉｎｇ（ＰｏｗｄｅｒＭｅｔａｌ... 详细信息

ＲＯＯＭ－ＴＥＭＰＥＲＡＴＵＲＥＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＴｉＡｌ＋ＣｅＡＬＬＯＹＳ￥ＣｈｅｎＳｈｉｑｉ；ＱｕＸｕａｎｈｕｉ；ＨｕａｎｇＢａｉｙｕｎ；ＬｅｉＣｈａｎｇｍｉｎｇ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａｒｃｈｉｎｓｔ...

关键词： Ce TiAl alloy mechanical properties microstructures

Effects of Sc content on the mechanical properties of Al-Sc alloys

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Rare Metals 2010年第5期29卷 451-455页

作者： SUN Yingying,SONG Min,and HE Yuehui State Key Laboratory of powder metallurgy,central south university,changsha 410083.china State Key Laboratory of powder metallurgy Central South University Changsha China

The effects of Sc content on the mechanical properties of Al-Sc alloys were investigated. The results show that the strengths of all the tested alloys with 0.1 wt.%, 0.3 wt.%, and 0.4 wt.% Sc additions increase initially with an increase in annealing time, due to the increase in volume fraction and size and the decrease in particle interspacing of Al3Sc particles. After reaching peak values, the strengths of all the tested alloys start to decrease with increasing annealing time due to the coarsening and increase in particle interspacing of At3Sc particles. It has also been shown that the alloy with 0.3 wt.% Sc has a higher strength and a lower elongation than the alloys with 0.1 wt.% and 0.4 wt.% Sc. The increase in strength and the decrease in elongation of the alloy with 0.3 wt.% Sc are due to the smaller particle interspacing of Al3Sc particles, resulting in a strong inhibition of dislocation movement during deformation.

关键词： aluminum alloys scandium mechanical properties microstructure

PHASE　TRANSFORMATION　AND　BIOMECHANICAL　COMPATIBILITY　OF　CALCIUM-PHOSPHATE　BIOCERAMICS

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中国有色金属学会会刊：英文版 1994年第4期4卷 101-104,108页

作者： Ruan Jianmin Huang Baiyun(powder metallurgy research institute,central south university of Technology, changsha 410083)

ＰＨＡＳＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＡＮＤＢＩＯＭＥＣＨＡＮＩＣＡＬＣＯＭＰＡＴＩＢＩＬＩＴＹＯＦＣＡＬＣＩＵＭ－ＰＨＯＳＰＨＡＴＥＢＩＯＣＥＲＡＭＩＣＳ￥ＲｕａｎＪｉａｎｍｉｎ；ＨｕａｎｇＢａｉｙｕｎ（Ｐｏｗｄｅ... 详细信息

ＰＨＡＳＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＡＮＤＢＩＯＭＥＣＨＡＮＩＣＡＬＣＯＭＰＡＴＩＢＩＬＩＴＹＯＦＣＡＬＣＩＵＭ－ＰＨＯＳＰＨＡＴＥＢＩＯＣＥＲＡＭＩＣＳ￥ＲｕａｎＪｉａｎｍｉｎ；ＨｕａｎｇＢａｉｙｕｎ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａｒ...

关键词： biomaterials phase transformation bio-mechanical compatibility