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Cu合金过渡层对激光熔化沉积Ni35/AlSi12双性能材料的影响
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作者 杨胶溪 王艳芳 +3 位作者 张健全 王志成 陈虹 王喜兵 《材料热处理学报》 EI CAS CSCD 北大核心 2015年第11期238-243,共6页
由于Ni基合金与Al Si12粉末的冶金反应较为显著,使得激光熔化沉积制备Ni35/Al Si12双性能材料时易生成高脆性Ni Al金属间化合物而具有较高开裂倾向。熔覆Cu合金做为过渡层,制备出无裂纹、冶金质量较好的Ni35/Cu/Al Si12双性能样品,使用... 由于Ni基合金与Al Si12粉末的冶金反应较为显著,使得激光熔化沉积制备Ni35/Al Si12双性能材料时易生成高脆性Ni Al金属间化合物而具有较高开裂倾向。熔覆Cu合金做为过渡层,制备出无裂纹、冶金质量较好的Ni35/Cu/Al Si12双性能样品,使用SEM、EDS和XRD对Ni35/Cu/Al Si12样品各涂层进行微观组织、物相分析,采用HV1000型显微硬度计对其进行硬度测试,使用ANSYS对Ni35/Cu/Al Si12材料进行稳态热模拟分析。结果表明:Cu合金过渡层可抑制Ni、Al金属间化合物形成,能够在一定程度上降低涂层开裂倾向;熔覆材料截面的硬度分布从底部到表面呈阶梯变化,具有良好的力学性能;Ni35/Cu/Al Si12双性能材料较单一Ni基合金具有更加优异的传热特性。 展开更多
关键词 双性能材料 激光熔化沉积 过渡层 组织结构 显微硬度
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激光熔覆制备Ni/Ni_3Al基双性能材料及其内部微观组织分析 被引量:11
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作者 杨胶溪 王艳芳 王志成 《中国激光》 EI CAS CSCD 北大核心 2015年第3期191-197,共7页
为解决激光熔覆工艺制备Ni/Ni3Al基双性能材料过程中产生的裂纹问题并使之保持良好的力学性能,采用优化工艺参数获得了冶金质量良好的双性能样品。研究发现,对制备过程中裂纹产生的原因与机理进行分析,通过改变激光参数能够有效降低涂... 为解决激光熔覆工艺制备Ni/Ni3Al基双性能材料过程中产生的裂纹问题并使之保持良好的力学性能,采用优化工艺参数获得了冶金质量良好的双性能样品。研究发现,对制备过程中裂纹产生的原因与机理进行分析,通过改变激光参数能够有效降低涂层的开裂倾向。采用扫描电子显微镜(SEM)和X射线衍射(XRD)等检测手段对单层和多层涂层进行微观组织形貌、成分分析,物相表征,结果发现单层熔覆样品由于Ni基合金的稀释作用在涂层中形成了少量Al8Cr5和Al4Cr Ni15相,而进行多层熔覆后,涂层样品物相为单一的Ni3Al相,单一的物相组成可保持Ni3Al基材料优异的性能,更能充分体现双性能材料的特点。对激光熔覆制备双性能原始样品和经过870℃时效处理之后的试样分别进行硬度测试,结果表明,制备得到的双性能样品在较高温度下依然能够保持较高的硬度值。 展开更多
关键词 激光熔覆 双性能材料 裂纹敏感性 显微硬度 时效处理
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High-temperature acoustic properties of porous titanium fiber metal materials 被引量:2
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作者 刘世锋 李安 +1 位作者 张朝晖 李东峰 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第8期1762-1766,共5页
The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement.... The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement. The effects on absorption coefficient were systematically assessed. The results show that the sound absorption performance is improved by increasing the sample porosity and/or thickness, and/or increasing the air-cavity thickness. Meanwhile, increasing the temperature gives better acoustic absorption performance in the low frequency range but also lowers the performance in the high frequency range, while double-layer structure enables better acoustic absorption performance. 展开更多
关键词 porous titanium fiber material acoustic absorption heat transfer pool boiling
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Collision performance of bitubular tubes with diaphragms 被引量:1
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作者 董海鹏 高广军 +1 位作者 谢素超 李健 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3657-3665,共9页
A numerical study of bitubular tubes with diaphragms compared with single and bitubular tubes subjected to dynamic axial impact force was presented. At first, the energy absorption response of the composite structure ... A numerical study of bitubular tubes with diaphragms compared with single and bitubular tubes subjected to dynamic axial impact force was presented. At first, the energy absorption response of the composite structure under axial loading was analyzed by finite element simulation. The results show that the efficiency of energy absorption can be improved by introducing diaphragms to the double-walled columns. Then, the effect of the amount and location of diaphragms, the shape and the size of the inner tubes, and the thickness of the composite structures were also studied numerically. The collision performance of the composite structure is affected by the deformation of diaphragms, as well as the interaction of outer and inner tube. The non-uniform distribution of diaphragms can improve the energy absorption efficiency of structures for a constant number of diaphragms. The specific energy absorption of the hexagonal inner tube is the highest, followed by the circular, octagonal and square ones. 展开更多
关键词 bitubular tube DIAPHRAGM energy absorption CRASHWORTHINESS
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Interface characterization of Al/Cu 2-ply composites under various loading conditions
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作者 Kwang Seok LEE Su Eun LEE Yong-Nam KWON 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第S1期36-41,共6页
The effects of reduction ratio during roll bonding on the microstructural evolution at interface and subsequent mechanical properties of roll-bonded Al/Cu 2-ply sheets were investigated. The interface microstructures ... The effects of reduction ratio during roll bonding on the microstructural evolution at interface and subsequent mechanical properties of roll-bonded Al/Cu 2-ply sheets were investigated. The interface microstructures for several Al/Cu 2-ply sheets fabricated under different reduction ratios between 30% and 65% were verified by transmission electron microscopy(TEM). Taking the difference of interface microstructure into consideration, 3-point bending and peel tests were performed for obtaining flexural and bonding strengths for Al/Cu 2-ply sheets. The effect of the quantified areas of metallurgical bonding at interfaces on the bonding strength was also discussed. The results show that both the bonding and flexural strengths for Al/Cu 2-ply sheets are reduced by decreasing the reduction ratio during the roll bonding process, which is strongly correlated with the interface microstructure. This was especially verified by observing the interface delamination from the 3-point bent samples. 展开更多
关键词 Al/Cu 2-ply composite flexural strength roll bonding reduction ratio INTERFACE
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Double network hydrogel with high mechanical strength:Performance,progress and future perspective 被引量:13
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作者 CHEN YongMei DONG Kun +1 位作者 LIU ZhenQi XU Feng 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第8期2241-2254,共14页
With high water content(~90 wt%) and significantly improved mechanical strength(~MPa),double network(DN) hydrogels have emerged as promising biomaterials with widespread applications in biomedicine.In recent years,D... With high water content(~90 wt%) and significantly improved mechanical strength(~MPa),double network(DN) hydrogels have emerged as promising biomaterials with widespread applications in biomedicine.In recent years,DN hydrogels with extremely high mechanical strength have achieved great advance,and scientists have designed a series of natural and biomimetic DN hydrogels with novel functions including low friction,low wear,mechanical anisotropy and cell compatibility.These advances have also led to new design of biocompatible DN hydrogels for regeneration of tissues such as cartilage.In this paper,we reviewed the strategies of designing high-strength DN hydrogel and analyzed the factors that affect DN hydrogel properties.We also discussed the challenges and future development of the DN hydrogel in view of its potential as biomaterials for their biomedical applications. 展开更多
关键词 high mechanical strength HYDROGEL double network cell compatibility friction and wear BIOCOMPATIBILITY
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In-situ electropolymerized bipolar organic cathode for stable and high-rate lithium-ion batteries 被引量:2
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作者 Wei Wang Chen Zhao +3 位作者 Jixing Yang Peixun Xiong Hai Su Yunhua Xu 《Science China Materials》 SCIE EI CAS CSCD 2021年第12期2938-2948,共11页
To address the dissolution issue and enhance the electrochemical performance of organic electrode materials,herein, a bipolar organic cathode was prepared by in-situ electropolymerization of amino-phenyl carbazole nap... To address the dissolution issue and enhance the electrochemical performance of organic electrode materials,herein, a bipolar organic cathode was prepared by in-situ electropolymerization of amino-phenyl carbazole naphthalene diimide(APCNDI). APCNDI is composed of n-type 1,4,5,8-naphthalene tetracarboxylic diimide that stores Li cations and p-type carbazole groups which react with anions and serve as polymerization sites. Electropolymerization completely eliminated the dissolution problem of APCNDI, and the electropolymerized cathode demonstrated a bipolar reaction with excellent electrochemical performance, stable cycling performance with a capacity retention of 92 mA h g;after1000 cycles, and a superior rate performance of 72 mA h g;at 10 A g;. The bipolar feature and reactions of APCNDI were systematically investigated and verified by multiple characterization techniques. Our findings provide a novel strategy for the design and fabrication of electrodes for high-performance organic batteries. 展开更多
关键词 lithium-ion battery bipolar organic cathode in-situ electropolymerization polyimide CARBAZOLE
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Carbonaceous aerogel and CoNiAl-LDH@CA nanocomposites derived from biomass for high performance pseudo-supercapacitor 被引量:5
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作者 Sidi Zhang Jian Liu +3 位作者 Peipei Huang Hao Wang Changyan Cao Weiguo Song 《Science Bulletin》 SCIE EI CAS CSCD 2017年第12期841-845,共5页
Conversion of waste biomass to valuable carbonaceous material is a sustainable and environmental benign method for energy and reduction of greenhouse gas emission. Herein, a two-step hydrothermal method was developed ... Conversion of waste biomass to valuable carbonaceous material is a sustainable and environmental benign method for energy and reduction of greenhouse gas emission. Herein, a two-step hydrothermal method was developed to fabricate high performance electrode material from pomelo peels. In the first step, the pomelo peels were transformed to carbonaceous aerogel (CA), which constructed of three- dimensional, sponge-like brown monolith with hierarchical pores, low-density (0.032 g]cm3) and excel- lent mechanical flexibility. Then, the cobalt nickel aluminum layered double hydroxide (CoNiAI-LDH) was in situ loaded on the surface of CA to form exquisite core-shell structure (CoNiAI-LDH@CA) through the second hydrothermal step. When used as an electrode material for supercapacitor, CoNiA1-LDHOCA exhibited high specific capacitances of 1,134F/g at 1A/g and 902Fig at 10A/g, respectively. Furthermore, they displayed an excellent cycling stability without an obvious capacitance decrease after 4,000 cycles. 展开更多
关键词 BiomassCarbonaceous aerogelLayered double hydroxideSupercapacitor
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