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Effect of the capsule on deformation and densification behavior of nickel-based superalloy compact during hot isostatic pressing 被引量:3
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作者 Lebiao Yang Xiaona Ren +4 位作者 Chao Cai Pengju Xue MIrfan Hussain Yusheng Shi Changchun Ge 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第1期122-130,共9页
The Shima yield criterion used in finite element analysis for nickel-based superalloy powder compact during hot isostatic pressing(HIP) was modified through uniaxial compression experiments. The influence of cylindric... The Shima yield criterion used in finite element analysis for nickel-based superalloy powder compact during hot isostatic pressing(HIP) was modified through uniaxial compression experiments. The influence of cylindrical capsule characteristics on FGH4096M superalloy powder compact deformation and densification behavior during HIP was investigated through simulations and experiments. Results revealed the simulation shrinkage prediction fitted well with the experimental shrinkage including a maximum shrinkage error of 1.5%. It was shown that the axial shrinkage was 1.7% higher than radial shrinkage for a cylindrical capsule with the size of ∮50 mm × 100 mm due to the force arm difference along the axial and radial direction of the capsule. The stress deviated from the isostatic state in the capsule led to the uneven shrinkage and non-uniform densification of the powder compact. The ratio of the maximum radial displacement to axial displacement increased from0.47 to 0.75 with the capsule thickness increasing from 2 to 4 mm. The pressure transmission is related to the capsule thickness, the capsule material performance, and physical parameters in the HIP process. 展开更多
关键词 hot isostatic pressing nickel-based superalloy compact CAPSULE densification DEFORMATION
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Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries 被引量:3
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作者 Gwonsik Nam Jaeseong Hwang +4 位作者 Donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第4期562-568,共7页
The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance decay.Herein,we have suggested... The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance decay.Herein,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated coprecipitation.Pelletization-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline particle.Furthermore,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary particle.As a result,single-crystalline Ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage cycling.This work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs). 展开更多
关键词 Lithium-ion batteries Ni-rich cathode materials Mechanical densification Solid-state synthesis
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Preparation of B_(2)O_(3)-ZnO-SiO_(2)Glass and Sintering Densification of Copper Terminal Electrode Applied in Multilayer Ceramic Capacitors
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作者 YUE Yi LI Hong +6 位作者 CAO Xiuhua ZHANG Xuehui HUANG Jun HUANG Xuye ZHANG Yongqiang XU Ruipeng XIONG Dehua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第5期960-968,共9页
B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper ter... B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper terminal electrode for multilayer ceramic capacitors(MLCC)applications.The structure and property characterization of B_(2)O_(3)-Zn O-SiO_(2)glass,including X-ray diffraction,FTIR,scanning electron microscopy,high-temperature microscopy,and differential scanning calorimetry,indicated that the addition of CuO improved the glass’s acid resistance and glass-forming ability.The wettability and acid resistance of this glass were found to be excellent when CuO content was 1.50 wt%.Compared to BZS glass,the CuO-added glass exhibited excellent wettability to copper powder and corrosion resistance to the plating solution.The sintered copper electrode films prepared using the glass with CuO addition had better densification and lower sintering temperature of 750℃.Further analysis of the sintering mechanism reveals that the flowability and wettability of the glass significantly impact the sintering densification of the copper terminal electrodes. 展开更多
关键词 B_(2)O_(3)-ZnO-SiO_(2)(BZS) low melting glass MLCC densification copper terminal electrode
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Sintering Densification of Boron Carbide Materials and Their Research Progress
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作者 ZOU Xin CHEN Ping'an +3 位作者 XU Guangping LI Xiangcheng ZHU Yingli ZHU Boquan 《China's Refractories》 CAS 2023年第4期22-27,共6页
Boron carbide(B_(4)C)has excellent high-temperature oxidation resistance,high hardness,low relative density,high melting point and excellent abrasive resistance,which is widely used in fields such as refractories,wear... Boron carbide(B_(4)C)has excellent high-temperature oxidation resistance,high hardness,low relative density,high melting point and excellent abrasive resistance,which is widely used in fields such as refractories,wear-resistant materials and lightweight protective materials.The research progress and application of B_(4)C materials in China and overseas in recent years were summarized.The influences of sintering processes(pressureless sintering,hot-pressing sintering,hot isostatic pressing sintering,spark plasma sintering and microwave sintering)and sintering additives(simple substances,oxides and carbides)on the B_(4)C densification were analyzed.The development of B_(4)C materials was prospected. 展开更多
关键词 boron carbide REFRACTORIES densification preparation method sintering additive research progress
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Effect of Sc_2O_3 addition on densification and microstructure of different spinelized magnesium aluminate spinels 被引量:7
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作者 李劼 刘建华 +1 位作者 吕晓军 赖延清 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期144-151,共8页
The densification and microstructure of different spinelized magnesium aluminate spinels(MAS) were studied adding Sc_2O_3 as additive. Sintered products were then characterized in terms of densification, phase analy... The densification and microstructure of different spinelized magnesium aluminate spinels(MAS) were studied adding Sc_2O_3 as additive. Sintered products were then characterized in terms of densification, phase analysis, quantitative elemental analysis and microstructure. The results show that Sc_2O_3 is found to be beneficial for the densification of MAS. Sc_2O_3 has a more significant effect on the densification of partially spinelized MAS batch than that of fully spinelized MAS batch. At the sintering temperature of 1650 °C, the bulk density of sintered products of partially spinelized powders increases by 0.243 g/cm3 as the Sc_2O_3 content increases from 0 to 4%(mass fraction) and that of fully spinelized powder increases by 0.14 g/cm3. Compared with the sintered samples prepared from the fully spinelized powder, the sintered samples using the partially spinelized powders as raw materials have more compact microstructures. 展开更多
关键词 magnesium aluminate spinel Sc_2O_3 densification MICROSTRUCTURE elemental analysis
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Hot pressing densification of WC-Mo_xC binderless carbide 被引量:2
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作者 张立 陈述 +3 位作者 单成 黄方杰 程鑫 马鋆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期2027-2031,共5页
WC-6MoxC-0.47Cr3C2-0.28VC binderless carbide was prepared by hot pressing (1700 °C, 20 MPa). The sample was observed and analyzed by scanning electron microscopy, energy dispersive X–ray spectroscopy and X–ra... WC-6MoxC-0.47Cr3C2-0.28VC binderless carbide was prepared by hot pressing (1700 °C, 20 MPa). The sample was observed and analyzed by scanning electron microscopy, energy dispersive X–ray spectroscopy and X–ray diffraction. The results show that during the hot pressing process, W atoms dissolve substantially into the MoxC crystal lattices; whilst, the reverse dissolution of Mo atoms into the WC crystal lattices takes place. Consequently, the main phase and binder phase structure are formed. The phase compositions of the main phase and binder phase are a WC-based solid solution containing Mo and a Mo2C-based solid solution containing W, respectively. The isotropic dissolution and precipitation of W and Mo atoms do not result in substantial carbide coarsening. The mechanism for the densification was discussed. 展开更多
关键词 binderless carbide hot pressing diffusion behavior densification grain growth WC-MoxC
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Densification and microstructure evolution during SPS consolidation process in W-Ni-Fe system 被引量:2
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作者 胡可 李小强 +1 位作者 杨超 李元元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期493-501,共9页
Spark plasma sintering method (SPS) was used to consolidate mixed W-5.6Ni-1.4Fe (mass fraction, %) powders from commercial fine elemental powders, and both the densification behavior and microstructure evolution i... Spark plasma sintering method (SPS) was used to consolidate mixed W-5.6Ni-1.4Fe (mass fraction, %) powders from commercial fine elemental powders, and both the densification behavior and microstructure evolution in sintering were investigated at different heating rates. The results show that the SPS densification process can be divided into three stages. At the initial unshrinking stage, fast heating generates instantaneous discharge and locally inhomogeneous temperature distribution in solid-state powder particles, enhancing later densification; during the intermediate solid state sintering stage, diffusion is more sufficient in the slow-heated SPS process; at the final transient liquid-phase sintering stage, tungsten grains become sphered and coarsen rapidly, but fast heating helps maintain rather small grain sizes. 展开更多
关键词 densification behavior microstructure evolution SPS W-Ni-Fe alloy
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Densification process of 10%B_4C-AA2024 matrix composite strips by semi-solid powder rolling 被引量:1
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作者 莫灼强 刘允中 +1 位作者 贾惠芳 吴敏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3181-3188,共8页
Semi-solid powder rolling(SSPR) is a novel strip manufacturing process,which includes the features of semi-solid rolling and powder rolling.In this work,densification process and deformation mechanisms of B4 C and A... Semi-solid powder rolling(SSPR) is a novel strip manufacturing process,which includes the features of semi-solid rolling and powder rolling.In this work,densification process and deformation mechanisms of B4 C and AA2024 mixed powders in the presence of liquid phase were investigated.The relationships between relative densities and rolling forces were analyzed as well.The results show that liquid fraction plays an important role in the densification process which can be divided into three stages.Rolling deformation is the main densification mechanism in deformation area when the liquid fraction is lower than 20%.When the liquid fraction is equal to or higher than 20%,the flowing and filling of liquid phase are the densification mechanisms in deformation area.The relative densities increase with increasing rolling forces.The relative density–rolling force curves are similar at 550 °C and 585 °C.The characteristics of the curve shapes are apparently different at 605 °C and 625 °C. 展开更多
关键词 semi-solid powder rolling composite strip densification process rolling deformation
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Pressure sintering of W-15wt.%Cu alloys prepared by mechanical alloying as a subsequent densification treatment method 被引量:8
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作者 LI Zhigang JIA Chengchang +2 位作者 SUN Lan HE Yuntao FAN Shimin 《Rare Metals》 SCIE EI CAS CSCD 2006年第2期124-128,共5页
The sintered W-15wt.%Cu alloys fabricated by mechanical alloying were re-sintered under pressure to increase the density and improve the properties of these alloys. The pressure was applied vertically along the axis o... The sintered W-15wt.%Cu alloys fabricated by mechanical alloying were re-sintered under pressure to increase the density and improve the properties of these alloys. The pressure was applied vertically along the axis of the sintered sample. Properties such as density, hardness, and bending strength were measured. The microstructures of the sintered bodies were observed. The results showed that the subsequent pressure sintering could increase the density of the sintered W-15wt.%Cu alloys. Their hardness, bending strength, and some other physical properties were also improved by this subsequent densification treatment. 展开更多
关键词 powder metallurgy W-Cu alloy densification mechanical alloying SINTERING
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Microwave sintering of Mo nanopowder and its densification behavior 被引量:7
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作者 Bo-hua DUAN Zhao ZHANG +1 位作者 De-zhi WANG Tao ZHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第8期1705-1713,共9页
In order to prepare high-performance Mo with fine and homogeneous microstructure to meet the demand of high-technology applications such as metallurgical,mechanical,national defense,aerospace and electronics applicati... In order to prepare high-performance Mo with fine and homogeneous microstructure to meet the demand of high-technology applications such as metallurgical,mechanical,national defense,aerospace and electronics applications,the microwave sintering process and densification mechanism of Mo nanopowder were studied.In this experiment,Mo nanopowder and micropowder were used for conventional sintering and microwave sintering at different sintering temperatures and sintering time,respectively.The results showed that with the increase in the sintering temperature,the increase rates of the relative density and hardness increased rapidly at first and then slowed down.The relative density rapidly reached 95%,followed by a small change.Mo nanopowder with a relative density of 98.03% and average grain size of 3.6 μm was prepared by microwave sintering at 1873 K for30 min.According to the analysis of the sintering kinetics,its densification is attributed to the combination of volumetric diffusion and grain boundary diffusion mechanisms.The calculated sintering activation energy of Mo nanopowder was 203.65 kJ/mol,which was considerably lower than that in the conventional sintering,suggesting that the microwave sintering was beneficial to the enhancement in the atom diffusion and densification for the powder.The results confirm that the microwave sintering is a promising method to economically prepare molybdenum with high properties. 展开更多
关键词 MOLYBDENUM microwave sintering NANOPOWDER densification kinetics diffusion mechanism
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Densification Mechanism of Warm Compaction and Powder Mixture Designing Rules 被引量:10
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作者 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) 《Journal of Central South University》 SCIE EI CAS 2000年第1期4-6,共3页
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 densifica... 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. 展开更多
关键词 warm compaction densification mechanism powder mixture designing rule
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Effects of selective laser melting parameters on surface quality and densification behaviours of pure nickel 被引量:7
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作者 Tian-yang YUE Sheng ZHANG +4 位作者 Chao-yue WANG Wei XU Yi-di XU Yu-sheng SHI Yong ZANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第8期2634-2647,共14页
The effects of laser power and scanning speed on the forming characteristic of scanning tracks,densification behaviours and surface roughness of pure nickel fabricated with selective laser melting(SLM)were studied.The... The effects of laser power and scanning speed on the forming characteristic of scanning tracks,densification behaviours and surface roughness of pure nickel fabricated with selective laser melting(SLM)were studied.The results indicate that the scanning tracks showed continuous,regular and flat surface with increasing laser power and decreasing scanning speed in a specific range,which could avoid the defects(like holes and balling structures)forming in SLM processing.The optimal process window was identified as the scanning speed of 900 mm/s and the laser power of 255−275 W by comparing the surface qualities and densification behaviours.With the suitable processing parameters,the relative density could achieve 99.16%,the tensile strength was(359.49±2.74)MPa,and the roughnesses of the top and side surfaces were(12.88±2.23)and(14.98±0.69)μm,respectively. 展开更多
关键词 selective laser melting pure nickel scanning track densification surface roughness
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Effects of hot isostatic pressing temperature on casting shrinkage densification and microstructure of Ti6Al4V alloy 被引量:5
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作者 Qian Xu Jian-xin Zhou +4 位作者 Hai Nan Ya-jun Yin Min Wang Xu Shen Xiao-yuan Ji 《China Foundry》 SCIE 2017年第5期429-434,共6页
The Ti6Al4V alloy castings were produced by the investment casting process, and the hot isostatic pressing(HIP) was used to remove shrinkage from castings. The processing pressure and holding time for HIP were 150 MPa... The Ti6Al4V alloy castings were produced by the investment casting process, and the hot isostatic pressing(HIP) was used to remove shrinkage from castings. The processing pressure and holding time for HIP were 150 MPa and 20 min, respectively. Four different HIP temperatures were tested, including 750 ℃, 850 ℃, 920 ℃ and 950 ℃. To evaluate the effects of temperature on densification and microstructure of Ti6Al4V alloy treated by HIP, non-destructive testing and metallographic observation was performed. The experimental results show that the shrinkage was completely closed at 920 ℃ and 950 ℃. The densification of Ti6Al4V alloy increased as the HIP temperature increased below 920 ℃. The lamel ae were more uniform, the thickness of lamel ae was obviously broadened and the structure was coarsen. Besides, the Norton creep equation was used to simulate the effect of different temperatures on the densification of Ti6Al4V alloy during HIP. The simulation results were in good agreement with the experimental results. It was also found that 920 ℃ is a suitable temperature for HIP for Ti6Al4V alloy. 展开更多
关键词 Ti6Al4V alloy hot isostatic pressing TEMPERATURE casting shrinkage densification MICROSTRUCTURE
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Effects of MgO on densification and consolidation of oxidized pellets 被引量:4
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作者 高强健 姜鑫 +1 位作者 魏国 沈峰满 《Journal of Central South University》 SCIE EI CAS 2014年第3期877-883,共7页
The calcined magnesite was utilized as a kind of MgO bearing additive to produce MgO bearing pellets. The effects of MgO on densification and consolidation of pellets were investigated. The experimental results show t... The calcined magnesite was utilized as a kind of MgO bearing additive to produce MgO bearing pellets. The effects of MgO on densification and consolidation of pellets were investigated. The experimental results show that, at the same process parameters, the porosity and pore size distribution of green pellets have no evident relation with the MgO bearing additive, pore size of green pellets is between 15 μm and 35 μm and the porosity of green pellets is about 34%. There is a densification and consolidation phenomenon during the induration process; the pore size and porosity of product pellets decrease gradually; and the structure of product pellets becomes dense. MgO makes a negative effect on the densification and consolidation of product pellets, the densification ratio of pellets decreases from 46.3% to 28.6% with the addition of MgO bearing additive from 0 to 2.0 %. The porosity and the pore size of product pellets increase gradually with the increase of MgO content; When the mass fraction of MgO bearing additive increases from 0 to 2.0%, the pore size of product pellet increases and the pore size distributes in a large range. Also, the porosity increases from 18.61% to 24.06%. 展开更多
关键词 MGO oxidized pellets densification POROSITY pore size
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Initial densification strain point's determination of honeycomb structure subjected to out-of-plane compression 被引量:3
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作者 WANG Zhong-gang ZHOU Wei LIU Jie-fu 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第7期1671-1675,共5页
Compression ratio is significant for cellular structures on energy absorption. In the present work, theoretical formulas to determine the initial densification strain of honeycomb structure were put forward by means o... Compression ratio is significant for cellular structures on energy absorption. In the present work, theoretical formulas to determine the initial densification strain of honeycomb structure were put forward by means of minimum energy principle. Detailed densification strain points were identified, with full fold model for kinds of specimens. To validate, corresponding numerical simulations were carried out with explicit finite element method. Excellent agreement in terms of initial densification stain point has been observed between the theoretical calculation and numerical simulation. The results show that: (1) a different honeycomb structure has different initial densification strain point, and its geometric configuration of cells plays an evident role on densification; (2) half-wave length of the wrinkle of honeycomb in folding process significantly influences on the densification strain point; (3) the initial densification point is an decreasing power function of the ratio of foil thickness to cell length, with the exponent 2/3. These achievements provide important references for design in cellular energy absorption devices. 展开更多
关键词 HONEYCOMB densification STRAIN full FOLD element half-wave length
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Improving Densification and Mechanical Properties of FeAl/TiC Composites by Addition of Ni 被引量:4
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作者 Yong LIU, Fengxiao LIU, Baiyun HUANG, Kechao ZHOU, Yuehui HE and Zhihong TANGNational Key Lab for P/M, Central South University, Changsha 410083, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第1期73-76,共4页
FeAl/TiC composites were fabricated by hot pressing blended elemental powders. The effects of Ni-doping on thedensification and mechanical properties of the composites were studied. Results show that the density of th... FeAl/TiC composites were fabricated by hot pressing blended elemental powders. The effects of Ni-doping on thedensification and mechanical properties of the composites were studied. Results show that the density of the composites decreases with the content of TiC increasing, and the addition of Ni significantly improves the densificationprocess by enhancing mass transfer in the bonding phase. The mechanical properties of the composites are closelyrelated with their porosity. Besides increasing the density of the composites, the addition of Ni improves the mechanical properties by other three effects: solution-strengthening the bonding phase, strengthening the FeAI-TiC interfaceand increasing ductile fracture in FeAl phase. 展开更多
关键词 of in it on TiC Improving densification and Mechanical Properties of FeAl/TiC Composites by Addition of Ni by
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Densification and sintering dynamics of 10NiO-NiFe_2O_4 composites doped with CaO 被引量:4
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作者 李劼 张刚 +2 位作者 赖延清 张勇 田忠良 《Journal of Central South University of Technology》 EI 2007年第5期629-632,共4页
The effects of CaO content in the range from 0 to 4.0%, and sintering temperature on the phase composition, relative density and electrical conductivity of 10NiO-NiFe2O4 composites doped with CaO were studied. The res... The effects of CaO content in the range from 0 to 4.0%, and sintering temperature on the phase composition, relative density and electrical conductivity of 10NiO-NiFe2O4 composites doped with CaO were studied. The results show that there is no change of structure for NiO or NiFe2O4; there is apparent oxygen absorbing and releasing behavior during the heating process in air for 10NiO-NiFe2O4 composites. Introduction of CaO can accelerate the densification of 10NiO-NiFe2O4 composites. The maximum value of relative density is 98.75% for composite doped with 2.0% CaO and sintered at 1 200 ℃, which is beyond about 20% for the undoped composites. The sintering activated energy of sample containing 2% CaO decreases by 15.87 kJ/mol, compared with that of the undoped sample. 展开更多
关键词 aluminum electrolysis inert anode CaO doping densification sintering dynamics
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PLASTIC DEFORMATION AND DENSIFICATION FOR SINTERED POWDER MATERIALS 被引量:4
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作者 Hua Lin Zhao Zhongzhi 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1992年第4期82-87,共6页
Equivalent yield strength of sintered powder materials is determined by experiments,and the following yield condition is constructed based on it.Experiments on uniaxial compression,and plane strain,closed die upsettin... Equivalent yield strength of sintered powder materials is determined by experiments,and the following yield condition is constructed based on it.Experiments on uniaxial compression,and plane strain,closed die upsetting have been done using sintered copper,and the relation between the deformation resistance and compactness of the prefabricated preform is analysed.A design principle for the prefabricated preform density is proposed,and the effectiveness of shear plastic deformation to densifleation is pointed out. 展开更多
关键词 sintered materials plasticity theory densification
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Sequence of densification and hydrocarbon charging of Xu2 reservoir in Anyue–Hechuan area,Sichuan Basin,China 被引量:2
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作者 陈聪 徐国盛 +2 位作者 徐昉昊 袁海锋 陈飞 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第6期1439-1448,共10页
The sequence of the densification and hydrocarbon charging of the Xu2 reservoir in the Anyue–Hechuan area of Central Sichuan Basin is discussed.The diagenetic sequence is considered a time line to determine the histo... The sequence of the densification and hydrocarbon charging of the Xu2 reservoir in the Anyue–Hechuan area of Central Sichuan Basin is discussed.The diagenetic sequence is considered a time line to determine the historical relationship between the densification process and the hydrocarbon charging of the Xu2 reservoir in the study area:Early diagenetic stage B(the first stage of hydrocarbon charging,which was about 200–160 Ma ago,with a porosity of about 20%,consolidated and not tight)→middle diagenetic stage A(the second stage of hydrocarbon charging,which was about 140–120 Ma ago,with a porosity of 10%–20%and relatively tight)→middle diagenetic stage B(the third stage of hydrocarbon charging,which was about 20–5 Ma ago,with a porosity of 6%–10%and tight;However,fractures have developed).The study results prove that large-scale hydrocarbon charging and accumulation completed before the densification of the Xu2 reservoir,showing that the Upper Triassic Xujiahe Fm unconventional tight reservoir in the Sichuan Basin is prospective for exploration. 展开更多
关键词 Anyue-Hechuan area Xu2 member diagenetic sequence reservoir densification hydrocarbon charging INCLUSION
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A Numerical Study of Densification Behavior of Silicon Carbide Matrix Composites in Isothermal Chemical Vapor Infiltration 被引量:2
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作者 GUAN Kang WU Jianqing CHENG Laifei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第6期1365-1371,共7页
We studied the characteristics of two-scale pore structure of preform in the deposition process and the mass transfer of reactant gas in dual-scale pores, and observed the physiochemical phenomenon associated with the... We studied the characteristics of two-scale pore structure of preform in the deposition process and the mass transfer of reactant gas in dual-scale pores, and observed the physiochemical phenomenon associated with the reaction. Thereby, we established mathematical models on two scales, respectively, preform and reactor. These models were used for the numerical simulation of the process of ceramic matrix composites densified by isothermal chemical vapor infiltration(ICVI). The models were used to carry out a systematic study on the influence of process conditions and the preform structure on the densification behaviors. The most important findings of our study are that the processing time could be reduced by about 50% without compromising the quality of the material, if the processing temperature is 950-1 000 ℃ for the first 70 hours and then raised to 1 100 ℃. 展开更多
关键词 isothermal chemical vapor infiltration ceramic matrix composites process parameters fiber preform structure densification behavior
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