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| 1 | Densification Mechanism of Warm Compaction and Powder Mixture Designing Rules显示文摘By phenomenological analysis of warm compaction, it is found that, compared with the contribution of particle plastical deformation to densification of powder compact,the particle rearrangement is a dominant densification mechanism for powder warm compaction, and the plastical deformation of particles plays an important role in offering accommodating deformation for particle rearrangement and densifying powder compact at the final stage of pressing.In order to attain density gain as high as possible during warm compaction, six rules for designing warm compacting powder mixtures were proposed in detail. | CAO Shun hua,HUANG Bai yun,QU Xuan hui,YI Jian hong(State Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China) | 2000 | Journal of Central South University2000，12，1： | 10 |
| 2 | Preparation of Li-B Alloy and Study of Its Microstructure and Discharge Characteristics显示文摘A Li-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finely distributed in the metal Li by means of intensified Stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B. | Zhijian LIU, Zhiyou LI, Wei DUAN, Xuanhui QU, Baiyun HUANG and Siqi ZHANG (State Key Laboratory for Powder Metallurgy , Central-South University of Technology, Changsha 410083, China) | 2000 | Journal of Materials Science & Technology2000，16，6： | 9 |
| 3 | NUMERICAL SIMULATION OF FEEDSTOCK MELT FILLING IN A CYLINDRICAL CAVITY WITH SOLIDIFICATION IN POWDER INJECTION MOLDING显示文摘INTRODUCTIONPowderinjectionmolding(PIM)isaprocesingrouteforfabricatingmetalorceramiccomponentswithcomplexshapeandhighperfor?.. | Qu Xuanhui, Li Yimin, Yue Hongsheng, Mao Jinying, Zhu Lei and Huang Baiyun State Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 9 |
| 4 | Characteristic atom arranging crystallogphy of alloy phases for Au-Cu system显示文摘In this paper,it is pointed out that the descriptions of alloy phase structures are dependent on structural unit sequence.In the systematic science of alloys(SSA),the alloy phase structures are described by means of the symmetry element sequence combining with characteristic atom sequence.It is named the characteristic atom arranging structure,which can display the characteristic atoms at the lattice sites and the micro-inhomogeneity,besides the symmetry.Each characteristic atom has its own characters:neighboring configuration,potential energy,volume and electronic structure.The micro-inhomogeneity of alloy phases can be described by concentrations and short-range ordered parameters of characteristic atoms.The differences between the electronic structures of alloy phases and electronic structures of characteristic atoms in the alloy phases are also discussed. | XIE YouQing1,2,3,LIU XinBi1,2,3,PENG HongJian4,NIE YaoZhuang5,LI XiaoBo6 & LI YanFen1,2,3 1 School of Materials Science and Engineering,Central South University,Changsha 410083,China 2 Powder Metallurgy Research Institute,Central South University,Changsha 410083 China 3 State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China 4 School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China 5 School of Physical Science and Technique,Central South University,Changsha,410083,China 6 College of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China | 2011 | Science China(Technological Sciences)2011，54，6： | 8 |
| 5 | INVESTIGATION OF MULTI-STEP THERMO-MECHANICALTREATMENT OF CAN-FORGED TiAl-BASED ALLOY显示文摘The effects of a new technology, multi-step thermo-mechanical treatment, on the microstructure, deformation substructure and mechanical properties at ambient and elevated tempemture of can-forged Ti-33 Al-3 Cr-0.5Mo (wt%) Alloy were investigated.The results show that, after multi-step thermo-mechanical treatment of can-forged specimens, homogeneous, fine microstructures can be obtained in the whole TiAl-based alloy specimens. Furthermore, the specimen with homogeneous and fine full lamellae microstructure demonstrutes excellent comprehensive mechanical properties at ambient and elevated temperature. | Y.H. He B. Y. Huang Y. Liu and Y.X. Liu (Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, China) | 1997 | Acta Metallurgica Sinica(English Letters)1997，10，4： | 7 |
| 6 | Preparation of polystyrene/silica nanocomposites by radical copolymerization of styrene with silica macromonomer显示文摘A two-stage process has been developed to generate the silica-based macromonomer through surface-modification of silica with polymerizable vinyl groups. The silica surfaces were treated with excess 2,4-toluene diisocynate (TDI), after which the residual isocyanate groups were converted into polymerizable vinyl groups by reaction with hydroxypropylacrylate (HPA). Thus, polystyrene/silica nanocomposites were prepared by conventional radical copolymerization of styrene with silica macromonomer. The main effecting factors, such as ratios of styrene to the macromonomer, together with polymerization time on the copolymerization were studied in detail. FTIR, DSC and TGA were utilized to characterize the nanocomposites. Experimental results revealed that the silica nanoparticles act as cross-linking points in the polystytene/silica nanocomposites, and the glass transition temperatures of the nanocomposites are higher than that of the corresponding pure polystyrene. The glass transition temperatures of nanocomposites increased with the increasing of silica contents, which were further ascertained by DSC. | OU BaoLi1,2 & LI DuXin2 1 College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China 2 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China | 2007 | Science China Chemistry2007，50，3： | 6 |
| 7 | Preparation of well-defined polystyrene/silica hybrid nanoparticles by ATRP显示文摘Immobilization of the atom transfer radical polymerization (ATRP) macroinitiators at the silica nanoparticle surfaces was achieved through surface modification with excess toluene-2,4-diisocynate (TDI), after which the residual isocyanate groups were converted into ATRP macroinitiators. Structurally well-defined polystyrene chains were grown from the nanoparticle surfaces to yield individual particles composed of a silica core and a well-defined, densely grafted outer polystyrene by ATRP, which was initiated by the as-synthesized silica-based macroinitiator. FTIR, NMR and gel permeation chro-matography (GPC) were used to characterize the polystyrene/silica hybrid particles. | OU BaoLi1,2 LI DuXin2 1 College of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201, China 2 State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083, China | 2008 | Science China Chemistry2008，51，1： | 6 |
| 8 | Effects of Sc content on the mechanical properties of Al-Sc alloys显示文摘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 Al3Sc 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. | SUN Yingying,SONG Min,and HE Yuehui State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China | 2010 | Rare Metals2010，29，5： | 6 |
| 9 | TiAl ALLOYS PREPARED BY THERMAL EXTRUSION OF ELEMENTAL POWDER MIXTURES显示文摘TiAlALLOYSPREPAREDBYTHERMALEXTRUSIONOFELEMENTALPOWDERMIXTURES①LiuZhijian,QuXuanhui,HuangBaiyunPowderMetallurgyResearchInstitu... | Liu Zhijian, Qu Xuanhui, Huang Baiyun Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083 | 1997 | 中国有色金属学会会刊:英文版1997，7，1： | 6 |
| 10 | Microstructure and Properties of W-Cu Alloys Prepared with Mechanically Activated Powder显示文摘W-15% Cu (mass fraction) alloys were sintered with mechanically activated powder in order to develop new preparing processes and improve properties of alloys. The microstructures of the activated powder and the sintered alloy were observed. Properties such as density were measured. The results show that through mechanical activation, the particle size of the powder becomes finer to sub-micron or nanometer level, some copper was soluble in tungsten, and high density W-Cu alloys can be obtained by mechanically activated powder for its action to the activation sintering. | Chengchang Jia, Xiuhu Guan, Xuekuan Su, Changheng Hou, Shimin Fan, Jun Zhao, Zizhang Xie (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) (Beijing Research Institute of Powder Metallurgy, Beiji | 2001 | Journal of University of Science and Technology Beijing2001，8，2： | 5 |
| 11 | Effects of sintering pressure and temperature on microstructure and tribological characteristic of Cu-based aircraft brake material显示文摘A novel Cu-based P/M aircraft brake material was prepared and the effects of sintering pressure and temperature on microstructure and tribological characteristic were investigated. For the constant sintering temperature, when the sintering pressure increases from 0.5 MPa to 1.5 MPa, the porosity, wear loss and friction coefficient decrease remarkably. When the sintering pressure increases from 1.5 MPa to 2.5 MPa, the porosity further decreases but in a little degree and wear behaviors are improved slightly. However, once the sintering pressure is larger than 2.5 MPa, it has no obvious effect on microstructure and tribological characteristic. For the constant sintering pressure, when the sintering temperature increases from 900 ℃ to 930 ℃, the sintered density remarkably increases, and wear behaviors are obviously improved. For further increasing sintering temperature to 1 000 ℃, the density keeps on increasing, but wear behaviors change slightly. | 熊翔 盛洪超 陈洁 姚萍屏State Key Laboratory of Powder Metallurgy Central South University | 2007 | 中国有色金属学会会刊:英文版2007，17，4： | 5 |
| 12 | DEVELOPMENT OF MoS_2-CONTAINING Ni-Cr BASED ALLOYS AND THEIR HIGH-TEMPERATURE TRIBOLOGICAL PROPERTIES显示文摘DEVELOPMENTOFMoS2CONTAININGNiCrBASEDALLOYSANDTHEIRHIGHTEMPERATURETRIBOLOGICALPROPERTIES①XiongDangshengColegeofMechanicalEl... | Xiong DangshengCollege of Mechanical Electronic Engineering, China University of Mining and Technology, Xuzhou 221008, P. R. ChinaPeng Chaoqun and Huang QizhongState Key Lab for Powder Metallurgy, Central South University of Technology, Changs | 1998 | 中国有色金属学会会刊:英文版1998，8，2： | 5 |
| 13 | Biocompatibility evaluation in vitro. Part I: Morphology expression and proliferation of human and rat osteoblasts on the biomaterials显示文摘The biocompatibility evaluation of calcium phosphate based biomaterials is performed by tissue culture in vitro model. Three kinds of bioceramic materials which are potential to deal with bone trauma and/or conduct tissue growth are recommodated. The biological research results show that human and animal osteoblast cells anchor the materials surface in two hours in culture. Confocal laser scanning microscopy (CLSM) demonstrated the normal cell distribution and proliferation on both of dense and porous biomaterials. Hydroxyapatite and tricalcium phosphate stimulate cell proliferation. However, DNA and protein synthesis were considerably limited and the apoptosis phenomenon would be present on the hydroxyapatite (HA) materials by adding Al, Mg elements. Several important methods of biocompatibility evaluation of implant materials are described and the related biological molecular techniques such as tissue culture, cell transfection, cellular DNA stain, and Lowry assay are involved in the present research. | RUAN Jian ming 1,GRANT M. Helen 2 (1 Powder Metallurgy State Key Laboratory, Central South University, Changsha 410083, China 2 Bioengineering Unit, Strathclyde University, Glasgow, G4 0NW, UK) | 2001 | Journal of Central South University of Technology2001，8，1： | 5 |
| 14 | INJECTION MOLDED TUNGSTEN HEAVY ALLOY显示文摘INTRODUCTIONMetalInjectionMolding(MIM),whichisderivedfromplasticinjectionmolding,isakindofnewlydevelopedpowdermetalurgyformin... | Li Yimin, Qu Xuanhui, Li Zhilin and Huang Baiyun State Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 5 |
| 15 | SURFACE METALLIZATION OF CENOSPHERES AND PRECIPITATORS BY ELECTROLESS PLATING显示文摘This paper reports the use of a colloidal Pd0 catalysis system to metallize the surface of precipitators separated from coal fly-ash, and metals such as Cu, Ni etc. are deposited on the precipitators surface. Alternatively, according to the characteristic surface of cenospheres, an Ag coating catalysis system is adopted to first deposit Ag on the cenospheres surface, followed, if necessary, by the deposition of other metals such as Cu, Ni, etc. on the Ag coating to produce monolayer and multilayer metal-coated cenospheres. The surface characteristics and the morphologies of the metal coatings are examined in detail with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) techniques. It can be shown that the quality of metal coatings derived from the Ag coating catalysis system, is better than that of the colloidal Pd0 catalysis system. | Chujiang Cai, Zhigang Shen*, Mingzhu Wang, Shulin Ma and Yushan Xing Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics, Beijing 100083, P. R. China | 2003 | China Particuology2003，1，4： | 5 |
| 16 | THERMAL DEBINDING OF A NEW BINDER显示文摘THERMALDEBINDINGOFANEWBINDER①ZhouJicheng,HuangBaiyun,WuEnxi,YuLigong,QuXuanhuiNationalKeyLaboratoryforPowderMetalurgy,Centra... | Zhou Jicheng *, Huang Baiyun , Wu Enxi , Yu Ligong , Qu Xuanhui National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083 * Changsha Railway University, Changsha 410075 | 1997 | 中国有色金属学会会刊:英文版1997，7，4： | 5 |
| 17 | Growth of Hydroxyapatite Crystal in the Presence of Origanic Film显示文摘The growth of hydroxyapatite (Hap) crystal in the presence of hexadecylamine was investigated. Due to its high polarity and high charge density, the organic film could increase the ion supersaturation on its surface. Therefore the growth of pure Hap crystals was accelerated. Moreover, the positive headgroups of the organic film could act as recognized nucleation sites and orient the growth of Hap crystals along the<0001>direction. | Yong LIU, Suping HUANG, Xiaohong DAN and Kechao ZHOUState Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China | 2004 | Journal of Materials Science & Technology2004，20，2： | 4 |
| 18 | Properties of Hot-Pressed Al_2O_3-Fe Composites显示文摘Alumina-(0-20 vol. pct) iron composites were fabricated by hot-pressing of well-mixed alumina and iron powders at 1400℃ and 30 MPa for 30 mm. Hot-pressed bodies with nearly theoretical density were obtained for addition up to 10 vol. pct Fe, but relative density decreased gradually with further increase in Fe addition. The materials exhibit a homogeneous dispersion of Fe. Fracture strength of the composites exhibits a maximum value of 604 MPa at 15 vol. pct Fe, which is 1.5 times that of alumina alone. Fracture toughness increases with the increase in Fe content, reaching 7.5 MPa.m1/2 at 20 vol. pct Fe. The theoretical values of fracture toughness was calculated and compared with the experimental one. Toughening mechanisms of the composites are also discussed. | M.M.El-Sayed Seleman, Xudong SUN and Liang ZUO Department of Materials Science and Engineering, Northeastern University, Shenyang 110006, China K.A.Khalil Powder Metallurgy Institute, Central South University, Changsha 410083, China | 2001 | Journal of Materials Science & Technology2001，17，5： | 4 |
| 19 | SYNTHESIS OF Ti-47Al-2Cr-2Nb ALLOY THROUGH ELEMENTAL POWDER METALLURGY显示文摘INTRODUCTIONTiAlbasealoyshaveatractedmoreandmoreatentionbytheirhighspecificstrength,specificrigidityandexcelentpropertiesate... | Liu Yong, Huang Baiyun and He Yuehui Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 4 |
| 20 | Processing TiAl-Based Alloy by Elemental Powder Metallurgy显示文摘TiAl-based alloys with various compositions (including Ti-48Al, Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr- 2Nb-0.2B and Ti-47Al-3Cr, in mole fraction) had been prepared by elemental powder metallurgy (EPM). The results have shown that the density of the prepared Ti-48Al alloy increases with increasing hot pressing temperature up to 1300℃. The Ti-48Al alloy microstructure mainly consisted of island-like Ti3Al phase and TiAl matrix at hot pressing temperature below 1300℃, however, coarse a2/r lamellar colonies and r grains appeared at 1400℃. It has also indicated that the additions of elemental Cr and B can refine the alloy microstructure. The main microstructural inhomogeneity in EPM TiAl-based alloys was the island-like a2 phase or the aggregate of a2/r lamellar colony, and such island-like structure will be inherited during subsequent heat treatment in (a+r) field. Only after heat treatment in a field would this structure be eliminated. The mechanical properties of EPM TiAl-based alloys with various compositions were tested, and the effect of alloy elements on the mechanical properties was closely related to that of alloy elements on the alloy microstructures. Based on the above results, TiAl-based alloy exhaust valves were fabricated by elemental powder metallurgy and diffusion joining. The automobile engine test had demonstrated that the performance of the manufactured valves was very promising for engine service. | Yong LIU, Baiyun HUANG, Yuehui HE and Kechao ZHOU (National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China) | 2000 | Journal of Materials Science & Technology2000，16，6： | 3 |
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