期刊文献+
共找到3,520篇文章
< 1 2 176 >
每页显示 20 50 100
Ballistic performance of titanium-based layered composites made using blended elemental powder metallurgy and hot isostatic pressing
1
作者 Pavlo Markovsky Jacek Janiszewski +5 位作者 Dmytro Savvakin Oleksandr Stasyuk Bartosz Fikus Victor Samarov Vianey Ellison Sergey V.Prikhodko 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第9期1-14,共14页
Metal matrix composites tiles based on Ti-6Al-4V(Ti64)alloy,reinforced with 10,20,and 40(vol%)of either TiC or TiB particles were made using press-and-sinter blended elemental powder metallurgy(BEPM)and then bonded to... Metal matrix composites tiles based on Ti-6Al-4V(Ti64)alloy,reinforced with 10,20,and 40(vol%)of either TiC or TiB particles were made using press-and-sinter blended elemental powder metallurgy(BEPM)and then bonded together into 3-layer laminated plates using hot isostatic pressing(HIP).The laminates were ballistically tested and demonstrated superior performance.The microstructure and properties of the laminates were analyzed to determine the effect of the BEPM and HIP processing on the ballistic properties of the layered plates.The effect of porosity in sintered composites on further diffusion bonding of the plates during HIP is analyzed to understand the bonding features at the interfaces between different adjacent layers in the laminate.Exceptional ballistic performance of fabricated structures was explained by a significant reduction in the residual porosity of the BEPM products by their additional processing using HIP,which provides an unprecedented increase in the hardness of the layered composites.It is argued that the combination of the used two technologies,BEPM and HIP is principally complimentary for the materials in question with the abilities to solve the essential problems of each used individually. 展开更多
关键词 Metal matrix composites powder metallurgy Titanium hydride powder Master alloy Titanium carbide Titanium boride Hot isostatic pressing Ballistic tests
下载PDF
Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy:preparation, performance, and mechanisms 被引量:4
2
作者 Yi-Fan Yan Shu-Qing Kou +4 位作者 Hong-Yu Yang Shi-Li Shu Feng Qiu Qi-Chuan Jiang Lai-Chang Zhang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第3期200-234,共35页
Copper matrix composites doped with ceramic particles are known to effectively enhance the mechanical properties,thermal expansion behavior and high-temperature stability of copper while maintaining high thermal and e... Copper matrix composites doped with ceramic particles are known to effectively enhance the mechanical properties,thermal expansion behavior and high-temperature stability of copper while maintaining high thermal and electrical conductivity.This greatly expands the applications of copper as a functional material in thermal and conductive components,including electronic packaging materials and heat sinks,brushes,integrated circuit lead frames.So far,endeavors have been focusing on how to choose suitable ceramic components and fully exert strengthening effect of ceramic particles in the copper matrix.This article reviews and analyzes the effects of preparation techniques and the characteristics of ceramic particles,including ceramic particle content,size,morphology and interfacial bonding,on the diathermancy,electrical conductivity and mechanical behavior of copper matrix composites.The corresponding models and influencing mechanisms are also elaborated in depth.This review contributes to a deep understanding of the strengthening mechanisms and microstructural regulation of ceramic particle reinforced copper matrix composites.By more precise design and manipulation of composite microstructure,the comprehensive properties could be further improved to meet the growing demands of copper matrix composites in a wide range of application fields. 展开更多
关键词 copper matrix composites advanced powder metallurgy model prediction particle characteristics strengthening mechanism
下载PDF
In-situ additive manufacturing of high strength yet ductility titanium composites with gradient layered structure using N_(2)
3
作者 Yunmian Xiao Changhui Song +4 位作者 Zibin Liu Linqing Liu Hanxiang Zhou Di Wang Yongqiang Yang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第3期387-409,共23页
It has always been challenging work to reconcile the contradiction between the strength and plasticity of titanium materials.Laser powder bed fusion(LPBF) is a convenient method to fabricate innovative composites incl... It has always been challenging work to reconcile the contradiction between the strength and plasticity of titanium materials.Laser powder bed fusion(LPBF) is a convenient method to fabricate innovative composites including those inspired by gradient layered materials.In this work,we used LPBF to selectively prepare Ti N/Ti gradient layered structure(GLSTi)composites by using different N_(2)–Ar ratios during the LPBF process.We systematically investigated the mechanisms of in-situ synthesis Ti N,high strength and ductility of GLSTi composites using microscopic analysis,TEM characterization,and tensile testing with digital image correlation.Besides,a digital correspondence was established between the N_(2) concentration and the volume fraction of LPBF in-situ synthesized Ti N.Our results show that the GLSTi composites exhibit superior mechanical properties compared to pure titanium fabricated by LPBF under pure Ar.Specifically,the tensile strength of GLSTi was more than 1.5times higher than that of LPBF-formed pure titanium,reaching up to 1100 MPa,while maintaining a high elongation at fracture of 17%.GLSTi breaks the bottleneck of high strength but low ductility exhibited by conventional nanoceramic particle-strengthened titanium matrix composites,and the hetero-deformation induced strengthening effect formed by the Ti N/Ti layered structure explained its strength-plasticity balanced principle.The microhardness exhibits a jagged variation of the relatively low hardness of 245 HV0.2 for the pure titanium layer and a high hardness of 408 HV0.2 for the N_(2) in-situ synthesis layer.Our study provides a new concept for the structure-performance digital customization of 3D-printed Ti-based composites. 展开更多
关键词 laser powder bed fusion layered structure composites in-situ synthesis TiN strength-plasticity synergy
下载PDF
Functionally graded structure of a nitride-strengthened Mg_(2)Si-based hybrid composite
4
作者 Jeongho Yang Woongbeom Heogh +15 位作者 Hogi Ju Sukhyun Kang Tae-Sik Jang Hyun-Do Jung Mohammad Jahazi Seung Chul Han Seong Je Park Hyoung Seop Kim Susmita Bose Amit Bandyopadhyay Martin Byung-Guk Jun Young Won Kim Dae-kyeom Kim Rigoberto CAdvincula Clodualdo Aranas Jr Sang Hoon Kim 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第3期1239-1256,共18页
The ex-situ incorporation of the secondary SiC reinforcement,along with the in-situ incorporation of the tertiary and quaternary Mg_(3)N_(2) and Si_(3)N_(4) phases,in the primary matrix of Mg_(2)Si is employed in orde... The ex-situ incorporation of the secondary SiC reinforcement,along with the in-situ incorporation of the tertiary and quaternary Mg_(3)N_(2) and Si_(3)N_(4) phases,in the primary matrix of Mg_(2)Si is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of N_(2) gas during laser powder bed fusion.This is substantialized based on both the thermal diffusion-and chemical reactionbased metallurgy of the Mg_(2)Si–SiC/nitride hybrid composite.This study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive manufacturing.This strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the Mg_(2)Si–SiC/nitride hybrid composite.Consequently,the coefficient of friction of the hybrid composite exhibits a 309.3%decrease to–1.67 compared to–0.54 for the conventional nonreinforced Mg_(2)Si structure,while the tensile strength exhibits a 171.3%increase to 831.5 MPa compared to 485.3 MPa for the conventional structure.This outstanding mechanical behavior is due to the(1)the complementary and synergistic reinforcement effects of the SiC and nitride compounds,each of which possesses an intrinsically high hardness,and(2)the strong adhesion of these compounds to the Mg_(2)Si matrix despite their small sizes and low concentrations. 展开更多
关键词 Laser powder bed fusion Mg_(2)Si-SiC/nitride hybrid composite Both the thermal diffusion-and chemical reaction-based metallurgy Functionally graded structure compositional gradient Wear resistance.
下载PDF
Preparation of ZrB_(2)-ZrO_(2)-SiC Composite Powder by Carbothermal Reduction from Zircon
5
作者 TIAN Xuekun ZHOU Chaojie +4 位作者 ZHANG Lei ZHAO Fei JIA Quanli LIU Xinhong ZHONG Xiangchong 《China's Refractories》 CAS 2023年第1期25-29,共5页
Using zircon,boric acid and carbon black as starting materials,ZrB_(2)-ZrO_(2)-SiC composite powder was synthesized by calcining at 1500℃in flowing argon atmosphere.The effects of the soaking time(3,6 and 9 h)and the... Using zircon,boric acid and carbon black as starting materials,ZrB_(2)-ZrO_(2)-SiC composite powder was synthesized by calcining at 1500℃in flowing argon atmosphere.The effects of the soaking time(3,6 and 9 h)and the addition of additive AlF_(3)(0,0.5%,1.0%,1.5%,2.0%and 2.5%,by mass)on the phase composition and the microstructure of the synthesized products were investigated.The results show that:(1)ZrB_(2)-ZrO_(2)-SiC composite powder can be synthesized by carbothermal reduction at 1500℃in flowing argon atmosphere;ZrB_(2) and ZrO_(2) are granular-like,and SiC crystals are fiberous;(2)with the soaking time increasing,the amount of ZrB_(2) increases,the amounts of m-ZrO_(2) and SiC decrease,and the total amount of non-oxides ZrB_(2),SiC and ZrC gradually increases;the optimal soaking time is 3 h;(3)compared with the sample without AlF_(3),the sample with 0.5% AlF_(3) has decreased m-ZrO_(2)amount,noticeably increased ZrB_(2) amount but decreased SiC amount;however,when the addition of AlF_(3) increases from 0.5%to 2.5%,the m-ZrO_(2) amount increases,the ZrB_(2)amount decreases,and the SiC amount changes slightly;the optimum AlF_(3)addition is 0.5%. 展开更多
关键词 ZIRCON carbothermal reduction zirconium diboride-zirconia-silicon carbide composite powder
下载PDF
Effects of Metal and Composite Metal Nanopowders on the Thermal Decomposition of Ammonium Perchlorate (AP) and the Ammonium Perchlorate/Hydroxyterminated Polybutadiene (AP/HTPB) Composite Solid Propellant 被引量:9
6
作者 刘磊力 李凤生 +2 位作者 谈玲华 李敏 杨毅 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第4期595-598,共4页
Effects of metal (Ni, Cu, Al) and composite metal (NiB, NiCu, NiCuB) nanopowders on the thermal decomposition of ammonium perchlorate (AP) and composite solid propellant ammonium perchlorate/hydroxyterminated polybuta... Effects of metal (Ni, Cu, Al) and composite metal (NiB, NiCu, NiCuB) nanopowders on the thermal decomposition of ammonium perchlorate (AP) and composite solid propellant ammonium perchlorate/hydroxyterminated polybutadiene (AP/HTPB) were studied by thermal analysis (DTA). The results show that metal and composite metal nanopowders all have good catalytic effects on the thermal decomposition of AP and AP/HTPB composite solid propellant. The effects of metal nanopowders on the thermal decomposition of AP are less than those of the composite metal nanopowders. The effects of metal and composite metal nanopowders on the thermal decomposition of AP are different from those on the thermal decomposition of the AP/HTPB composite solid propellant. 展开更多
关键词 NANOpowder metal powder composite metal powder composite solid propellant ammonium perchlo-rate. thermal decompositionrate thermal decomposition
下载PDF
Properties, Phases and Microstructure of Microwave Sintered W-20Cu Composites from Spray Pyrolysis-continuous Reduction Processed Powders 被引量:4
7
作者 TAO Jianqin SHI Xiaoliang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第1期38-44,共7页
The effects of microwave sintering on the properties, phases and microstructure of W-2OCu alloy, using composite powder fabricated by spray pyrolysis-continuous reduction technology, were investigated. Compared with t... The effects of microwave sintering on the properties, phases and microstructure of W-2OCu alloy, using composite powder fabricated by spray pyrolysis-continuous reduction technology, were investigated. Compared with the conventional hot-press sintering, microwave sintering to W-2OCu composites could be achieved with lower sintering temperature and shorter sintering time. Furthermore, microwave sintered W-Cu composites with high densification, homogenous microstructure and excellent properties were obtained. Microwave sintering could also result in finer microstructures. :~ 展开更多
关键词 W-2OCu composite powder spray pyrolysis-continuous reduction microwave sintefing
下载PDF
NUMERICAL SIMULATION OF EXTRUSION OF COMPOSITE POWDERS PREPARED BY HIGH ENERGY MILLING 被引量:2
8
作者 X.Q.Li W.P.Chen +3 位作者 W.Xia Q.L.Zhu Y.Y.Li E.D.Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第1期51-54,共4页
Based on the characteristic of high energy milling and the micromechanics of composite material, a plastic constitutive equation is implemented for milled composite powders. To check the equation, the extrusion of Ti/... Based on the characteristic of high energy milling and the micromechanics of composite material, a plastic constitutive equation is implemented for milled composite powders. To check the equation, the extrusion of Ti/Al composite powders prepared by high energy milling was simulated. It was from the numerical analysis that the predicted extrusion pressure mounted up with milling time and extrusion ratio increasing, which was perfect agreement with experimental results. 展开更多
关键词 high energy milling composite powder plastic constitutive equation EXTRUSION numerical simulation
下载PDF
Morphology and carbon content of WC-6%Co nanosized composite powders prepared using glucose as carbon source 被引量:5
9
作者 Sheng-da GUO Rui BAO +2 位作者 Ping YANG Liang LIU Jian-hong YI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第4期722-728,共7页
Pure WC-6%Co nanosized composite powders were synthesized via a low-temperature method.The effects of carbon source on microstructure characteristic of composite powders were investigated,and the effects of heat-treat... Pure WC-6%Co nanosized composite powders were synthesized via a low-temperature method.The effects of carbon source on microstructure characteristic of composite powders were investigated,and the effects of heat-treatment parameter on carbon content of composite powders were also discussed.The results of SEM and XRD revealed that the carbon decomposing from glucose was more active than carbon black.Therefore,WC-Co nanosized composite powders could be synthesized at 900°C for 1 h under a hydrogen atmosphere.The individual WC grains were bonded together into a long strip under the action of cobalt.The results of carbon analysis revealed that the total carbon content decreased with the increase of the temperature in the range of 800-1000°C.Moreover,the total carbon content and the compounded carbon increased with the increase of the flow rate of H2 in the range of 1.1-1.9 m3/h. 展开更多
关键词 WC-6%Co composite powder carbon source heat-treatment parameter carbon content microstructure characteristic
下载PDF
Solidification Behavior of in situ TiB_(2)/Cu Composite Powders during Reactive Gas Atomization 被引量:2
10
作者 JIANG Yihui ZHANG Mingshu +3 位作者 LI Yufa HE Jiangtan CAO Fei LIANG Shuhua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第2期203-208,共6页
2wt%TiB_(2)/Cu composite powders were fabricated in situ by reactive gas atomization.The fabricated composite powder exhibits high sphericity,and the powder sizes range from 5μm to 150μm.The morphology of the Cu mat... 2wt%TiB_(2)/Cu composite powders were fabricated in situ by reactive gas atomization.The fabricated composite powder exhibits high sphericity,and the powder sizes range from 5μm to 150μm.The morphology of the Cu matrix and the distribution of the TiB2 particles in the composite powders vary with the powder size.The critical transitions of interface morphologies from dendritic-to-cellular and cellular-to-planar interfaces occurs when the composite powder sizes decrease to 34μm and 14μm,respectively.Compared with pure Cu droplets,the composite droplets undergo critical transition of the interface morphologies at a smaller droplet size corresponding to a higher cooling rate because the existence of TiB2 particles can cause instability in the advancing solidification front and heterogeneous nucleation.With decreasing powder size,the extent of the TiB_(2) particle interdendritic segregation decreases as the result of enhanced engulfment of TiB2 particles by the advancing solidification front. 展开更多
关键词 composite powder reactive gas atomization SOLIDIFICATION microstructure evolution
下载PDF
STUDY ON PREPARATION OF CERAMIC MATRIX COMPOSITE OF WC-Co ULTRAFINE POWDERS 被引量:1
11
作者 曹立宏 时东霞 +1 位作者 欧阳世翕 关波 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1995年第2期40-46,共7页
The W -Co compound precursor powders with an average particle sife of 60 nm were prepared by the chemical coprecipitation as the raw materials of Na2WO1 and CoCl2 and as the reagents of HCI and NH3 ?H2O. After re-duci... The W -Co compound precursor powders with an average particle sife of 60 nm were prepared by the chemical coprecipitation as the raw materials of Na2WO1 and CoCl2 and as the reagents of HCI and NH3 ?H2O. After re-ducing and carburizing the precursor powders by hydrogen gas and CO-CO 2 mixture gas. the WC-Co composite povvders ivith an average particle size of 0. 18/wi can be obtained. The purity and particle size of powders -were analysed by XRD and TEM. respectively. Meanwhile, the key factors to influ-ence the reducing and carburizing process of powders were also studied. 展开更多
关键词 WC-CO ceramic matrix composite ul-trafine powders
下载PDF
Atomic force microscope study of WC-10Co cemented carbide sintered from nanocrystalline composite powders 被引量:2
12
作者 Xiaoliang Shi Gangqin Shao Xinglong Duan Runzhang Yuan 《Journal of University of Science and Technology Beijing》 CSCD 2005年第6期558-563,共6页
In order to compare the spark plasma sintedng (SPS) process plus hot isostatic press (HIP) with vacuum sintedng plus HIP, an investigation was carried out on the topography, microstructure and gain size distributi... In order to compare the spark plasma sintedng (SPS) process plus hot isostatic press (HIP) with vacuum sintedng plus HIP, an investigation was carried out on the topography, microstructure and gain size distribution of nanocrystalline WC-10Co composite powder and the sintered specimens prepared by SPS plus HIP and by vacuum sintering plus HIP by means of atomic force microscopy (AFM). The mechanical properties of the sintered specimens were also investigated. It is very easy to find cobalt lakes in the specimen prepared by vacuum sintering plus HIP process. But the microstructure of the specimen prepared by SPS plus HIP is more homogeneous, and the grain size is smaller than that prepared by vacuum sintering plus HIP. The WC-10Co ultrafine cemented carbide consolidated by SPS plus HIP can reach a relative density of 99.4%, and the transverse rupture strength (TRS) is higher than 3540 MPa, the Rockwell A hardness (HRA) is higher than 92.8, the average grain size is smaller than 300 nm, and the WC-10Co ultrafine cemented carbide with excellent properties is achieved. The specimen prepared by SPS with HIP has better properties and microstructure than that prepared by vacuum sintering with HIP. 展开更多
关键词 WC-10Co nanocrystalline composite powder atomic force microscopy (AFM) spark plasma sintering (SPS) hot isostatic pressing (HIP)
下载PDF
Preparation of flake AgSnO_2 composite powders by hydrothermal method 被引量:7
13
作者 杨天足 杜作娟 +3 位作者 古映莹 邱晓勇 江名喜 楚广 《中国有色金属学会会刊:英文版》 EI CSCD 2007年第2期434-438,共5页
Silver-tin oxide composite powders and silver powders were synthesized by hydrothermal method using NH3 to complex Ag+, SO 32?to reduce Ag (NH3)+2 and Na2SnO3 as the source of tin. The powders were characterized by XR... Silver-tin oxide composite powders and silver powders were synthesized by hydrothermal method using NH3 to complex Ag+, SO 32?to reduce Ag (NH3)+2 and Na2SnO3 as the source of tin. The powders were characterized by XRD, SEM and EDX. The results show that there are macroscopic and microscopic differences between two kinds of powders. Spherical silver powders are 3 μm in diameter, and silver-tin oxide composite powders are mainly flake of about 0.3 μm in thickness. Silver crystal in silver-tin oxide composite powders is preferentially oriented in the (111) crystallographic direction and its oriented index is 2.581. Crystal lattice parameter of silver crystal of silver tin-oxide composite powders is 0.409 34 nm, larger than 0.408 68 nm of silver powders. The XPS analysis shows that silver in silver-tin oxide composite powders is metallic silver and tin oxide in silver tin-oxide composite powders has the red shift for Sn4+(3d5/2) and O2-(1s). 展开更多
关键词 水热法 AgSnO2复合粉末 制备 定向生长
下载PDF
Effects of tourmaline on microstructures and photocatalytic activity of TiO_2/SiO_2 composite powders 被引量:4
14
作者 孟军平 梁金生 +2 位作者 梁广川 于俊梅 潘艳芬 《中国有色金属学会会刊:英文版》 CSCD 2006年第B02期547-550,共4页
The SiO2/TiO2 composite powders including mineral tourmaline powders (T/SiO2/TiO2) were prepared from a sol made by a two-step hydrolysis method, using metasilicate ester as precursor. The powders were characterized b... The SiO2/TiO2 composite powders including mineral tourmaline powders (T/SiO2/TiO2) were prepared from a sol made by a two-step hydrolysis method, using metasilicate ester as precursor. The powders were characterized by scanning electron microscopy (SEM). The photocatalytic activity of the sample was evaluated by the photocatalytic degradation of methyl orange. The effects of heat-treatment on the photocatalytic activity were discussed. It is found that the T/SiO2/TiO2 composite powders show higher photocatalytic activity when including 10% SiO2 and 4% tourmaline. Moreover, the photocatalytic mechanism of tourmaline on the powders was proposed. 展开更多
关键词 电气石 二氧化钛/二氧化硅粉末 复合材料 显微结构 光催化活性
下载PDF
In-Situ Synthesis of AlN Powders and Composite AlN Powders with Yttrium Addition
15
作者 郑新和 王群 +2 位作者 林志浪 李春国 周美玲 《Journal of Rare Earths》 SCIE EI CAS CSCD 2002年第3期204-208,共5页
Using Al Mg and Al Mg Y alloys as raw materials and nitrogen as gas reactants, AlN powders and composite AlN powders by in situ synthesis method were prepared. AlN lumps prepared by the nitriding of Al Mg and Al ... Using Al Mg and Al Mg Y alloys as raw materials and nitrogen as gas reactants, AlN powders and composite AlN powders by in situ synthesis method were prepared. AlN lumps prepared by the nitriding of Al Mg and Al Mg Y alloys have porous microstructure, which is favorable for pulverization. They have high purity, containing 1.23%(mass fraction) oxygen impurity, and consisted of AlN single phase. The average particle size of AlN powders is 6.78 μm. Composite AlN powders consist of AlN phases and rare earth oxide Y 2O 3 phase. The distribution of particle size of AlN powders shows two peaks. In view of packing factor, AlN powders with such size distribution can easily be sintered to high density. 展开更多
关键词 rare earths alloys in situ synthesis AlN powders composite AlN powders
下载PDF
Fabrication of W@Cu Composite Powders by Direct Electroless Plating Using a Dripping Method
16
作者 刘树龙 YU Kan +4 位作者 沈强 LI Meijuan CHEN Wenshu LUO Guoqiang ZHANG Lianmeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第4期829-833,共5页
A direct electroless copper (Cu) coating on tungsten powders method requiring no surface treatment or stabilizing agent and using glyoxylic acid (C2H203) as a reducing agent was reported. The effects of copper sul... A direct electroless copper (Cu) coating on tungsten powders method requiring no surface treatment or stabilizing agent and using glyoxylic acid (C2H203) as a reducing agent was reported. The effects of copper sulfate concentration and the pH of the plating solution on the properties of the prepared W@Cu composite powders were assessed. The content of Cu in the composite powders was controlled by adjusting the concentration of copper sulfate in the electroless plating solution. A uniform, dense, and consistent Cu coating was obtained under the established optimum conditions (flow rate of C2H203 = 5.01 mL/min, solution pH = 12.25 and reaction temperature 45.35℃) by using central composite design method. In addition, the crystalline Cu coating was evenly dispersed within the W@Cu composite powders and Cu element in the coating existed as Cu~. The formation mechanism for the W@Cu composite powders by electroless plating in the absence of surface treatment and stabilizing agent was also proposed. 展开更多
关键词 dripping method electroless plating W@Cu composite powders characterization
下载PDF
Oxidation Properties of Silver Alloy Powders and Microstructures of Oxidized Powders for Making Electrical Contact Composites
17
作者 周继扣 马福康 刘茂林 《Journal of Rare Earths》 SCIE EI CAS CSCD 1998年第2期37-41,共5页
The oxidation properties of silver alloy powders and microstructures of oxidized powders have been investigated by thermo gravity analysis(TGA), scanning electron microscopy(SEM) and wave dispersive X ray spectrosco... The oxidation properties of silver alloy powders and microstructures of oxidized powders have been investigated by thermo gravity analysis(TGA), scanning electron microscopy(SEM) and wave dispersive X ray spectroscopy(WDEX). Ag Sn RE alloy powders have been oxidized completely at 610 ℃ within 60 min, with an external pure silver scale forming around each oxidized particle. It is useful to produce electrical contact composites. The excellent oxidation properties of Ag Sn RE alloy powders are attributed to the ideal microstructure of the oxidized powders. 展开更多
关键词 Rare earths Electrical contact composites Oxidation properties Microstructure of oxidized powders
下载PDF
Preparation of CNT/AlS i10Mg composite powders by high-energy ball milling and their physical properties
18
作者 Lin-zhi Wang Ying Liu +3 位作者 Wen-hou Wei Xu-guang An Tao Zhang Ya-yun Pu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第3期330-338,共9页
This study investigated the effects of carbon nanotube (CNT) concentration on the micro-morphologies and laser absorption proper- ties of CNT/AlSi10Mg composite powders produced by high-energy ball milling. A scanni... This study investigated the effects of carbon nanotube (CNT) concentration on the micro-morphologies and laser absorption proper- ties of CNT/AlSi10Mg composite powders produced by high-energy ball milling. A scanning electron microscope, X-ray diffractometer, laser particle size analyzer, high-temperature synchronous thermal analyzer, and UV/VIS/NIR spectrophotometer were used for the analysis of micro- graphs, phases, granulometric parameters, thermal properties, and laser absorption properties of the composite powders, respectively. The results showed that the powders gradually changed from flake- to granule-like morphology and the average particle size sharply decreased with in- creases in milling rotational speed and milling time. Moreover, a uniform dispersion of CNTs in AlSi10Mg powders was achieved only for a CNT content of 1.5wt%. Laser absorption values of the composite powders were also observed to gradually increase with the increase of CNT concentration, and different spectra displayed characteristic absorption peaks at a wavelength of approximately 826 nm. 展开更多
关键词 metal matrix composites aluminum alloys carbon nanotubes powder metallurgy particle size distribution ball milling physi-cal properties
下载PDF
Self-Propagating High-Temperature Reductive Synthesis of TiB_2-Al_2O_3 Composite Powders
19
作者 于志强 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第1期48-51,共4页
TiB2-Al2O3 composite powders were produced by self-propagating high-temperature synthesis(SHS) method with reductive process from B2O3-TiO2-AI system. X-ray diffraction(XRD) and scanning electron microscopy(SEM... TiB2-Al2O3 composite powders were produced by self-propagating high-temperature synthesis(SHS) method with reductive process from B2O3-TiO2-AI system. X-ray diffraction(XRD) and scanning electron microscopy(SEM) analyses show the presence of TiB2 and Al2O3 only in the composite powders produced by SHS. The powders are uniform and free-agglomerate. Transmission electron microscopy (TEM) and high resolution electron microscopy (HREM) observation of microstructure of the composite powders indicate that the interfaces of the TiB2-Al2O3 bond well, without any interfacial reaction products. It is proposed that the good interfacial bonding of the composite powders can be resulted from the TiB2 particles crystallizing and growing on the Al2O3 particles surface with surface defects acting as nucleation centers. 展开更多
关键词 SHS with reductive process TiB2-Al2O3 composite powders B2O3+TiO2+Al system microstructure
下载PDF
ZrB_2/Al_2O_3 composite powders prepared by self-propagating high-temperature synthesis 被引量:1
20
作者 于志强 杨振国 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第4期851-854,共4页
Self-propagating high-temperature synthesis(SHS) method was used to synthesize ZrB2/Al2O3 composite powders from B2O3-ZrO2-Al system. X-ray diffractometry(XRD) and scanning electron microscopy(SEM) analyses show... Self-propagating high-temperature synthesis(SHS) method was used to synthesize ZrB2/Al2O3 composite powders from B2O3-ZrO2-Al system. X-ray diffractometry(XRD) and scanning electron microscopy(SEM) analyses show the presence of ZrB2 and Al2O3 as the primary phases in the composite powders, while the presence of a very small amount of ZrO2 is thought to be unreacted zirconium oxide. Transmission electron microscopy(TEM) and high resolution electron microscopy(HREM) observations of microstructure of the composite powders indicate that the interfaces of ZrB2/Al2O3 bond well without any interfacial reaction products. It is proposed that the good interfacial bonding of composite powders results from the ZrB2 particles crystallizing and growing on the Al2O3 particles surface with surface defects acting as nucleation centers. 展开更多
关键词 ZrB2/Al2O3 复合材料 高温条件 合成方法 微结构
下载PDF
上一页 1 2 176 下一页 到第
使用帮助 返回顶部