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复合造孔技术制备超低密度多孔金块材 被引量:1
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作者 王勋 连利仙 +3 位作者 刘颖 孔清泉 田虎 唐颖 《功能材料》 EI CAS CSCD 北大核心 2012年第B08期141-144,共4页
以超细球形Al粉为模板,通过化学镀在其表面包覆镀Au,制备出Al/Au核壳结构的复合粉末,利用放电等离子烧结(SPS)技术使镀Au层与基体铝粉表层实现合金化,并制备出具有Al/Al-Au合金核壳结构的前驱体块材,随后采用两步法腐蚀除去核壳结构中... 以超细球形Al粉为模板,通过化学镀在其表面包覆镀Au,制备出Al/Au核壳结构的复合粉末,利用放电等离子烧结(SPS)技术使镀Au层与基体铝粉表层实现合金化,并制备出具有Al/Al-Au合金核壳结构的前驱体块材,随后采用两步法腐蚀除去核壳结构中的Al核并在其表层实现选择性地除去Al-Au合金层中Al的去合金化反应,得到多孔金块材。利用XRD、SEM、EDS研究了镀覆工艺对Al粉模板表面镀Au效果的影响及烧结、腐蚀过程中物相及化学成分的变化规律。结果表明,活化处理和还原剂种类对Al粉表面的镀覆效果有重要影响,制备的块体多孔金由纳米级孔径(80~120nm)和微米级孔径(1~10μm)两级孔径结构构成,微观组织结构均匀,密度低达0.39g/cm3,孔隙率为98%。 展开更多
关键词 模板 去合金化 超低密度 复合造孔
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SOFC复合孔隙阳极材料的制备及性能研究
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作者 葛岩 李志义 +2 位作者 魏炜 刘凤霞 刘志军 《电源技术》 CAS 北大核心 2024年第2期231-235,共5页
使用共流延工艺分别制备了以不同配比可溶性淀粉和碳纤维混合物作为造孔剂的阳极支撑型固体氧化物燃料电池(SOFC),阳极支撑层具有不规则的球型和直线型交错的复合孔隙,造孔剂总质量分数均为10%。电池以(Y_(2)O_(3))0.08(ZrO_(2))0.92(8Y... 使用共流延工艺分别制备了以不同配比可溶性淀粉和碳纤维混合物作为造孔剂的阳极支撑型固体氧化物燃料电池(SOFC),阳极支撑层具有不规则的球型和直线型交错的复合孔隙,造孔剂总质量分数均为10%。电池以(Y_(2)O_(3))0.08(ZrO_(2))0.92(8YSZ)及Ni作为阳极材料,其中Ni与8YSZ的质量比为1∶1,以8YSZ作为电解质材料,以(La_(0.75)Sr_(0.25))0.95MnO_(3±δ)(LSM)及8YSZ作为阴极材料。使用氢气作为燃料测试了各电池在750℃下的电化学性能,结果表明,淀粉与碳纤维质量之比为1.5的复合造孔剂所制备电池的功率密度最高,可达0.199 W/cm^(2)。扫描电子显微镜法(SEM)图像显示,淀粉和碳纤维在阳极支撑层中所形成的复合孔隙相互交织,连通性较好,具有较理想的微观结构。 展开更多
关键词 固体氧化物燃料电池 阳极支撑 复合造孔 微观结构 流延法
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刚玉-莫来石复相高温隔热耐火材料的制备与性能 被引量:3
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作者 殷波 吴梦飞 +2 位作者 殷骏 张少伟 廖佳 《江苏陶瓷》 CAS 2016年第5期16-19,共4页
本研究以白刚玉、氧化铝微粉以及二氧化硅微粉为主要原料,苏州土为结合剂,采用有机-无机复合造孔剂,采用机压法制备刚玉-莫来石复相高温隔热耐火材料。研究结果表明:所制备的刚玉-莫来石复相高温隔热耐火材料的性能优异,孔径分布范围较... 本研究以白刚玉、氧化铝微粉以及二氧化硅微粉为主要原料,苏州土为结合剂,采用有机-无机复合造孔剂,采用机压法制备刚玉-莫来石复相高温隔热耐火材料。研究结果表明:所制备的刚玉-莫来石复相高温隔热耐火材料的性能优异,孔径分布范围较小,强度高,热导率低,高温性能好,已被国内外知名企业广泛应用。 展开更多
关键词 有机-无机复合造孔 刚玉-莫来石复相 高温隔热耐火材料
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Effects of compocasting process parameters on microstructural characteristics and tensile properties of A356-SiC_p composites 被引量:6
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作者 Hamed KHOSRAVI Hamed BAKHSHI Erfan SALAHINEJAD 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2482-2488,共7页
The effects of compocasting process parameters on some structural and tensile characteristics of the A356-10% SiCp (volume fraction) composites were studied. Semisolid stirring was carried out at temperatures of 590, ... The effects of compocasting process parameters on some structural and tensile characteristics of the A356-10% SiCp (volume fraction) composites were studied. Semisolid stirring was carried out at temperatures of 590, 600 and 610 °C with stirring speeds of 200, 400 and 600 r/min for 10, 20 and 30 min. The distribution of the SiC particles within the matrix, porosity content and tensile properties of the obtained samples were examined. The structural evaluations show that by increasing the stirring time and decreasing the stirring temperature, the uniformity in the particle distribution is improved;however, by increasing the stirring speed the homogeneity firstly increases and then declines. It is also found that by increasing all of the processing parameters, the porosity content is enhanced. From the tensile characteristics viewpoint, the optimum values of the speed, temperature and time are found to be 400 r/min, 590 °C and 30 min, respectively. The contribution of the reinforcement distribution uniformity prevails over that of the porosity level to the tensile properties. 展开更多
关键词 A356-SiC_p composite semisolid stirring compocasting POROSITY reinforcement distribution tensile properties
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Microstructure and mechanical properties of aluminium metal matrix composites with addition of bamboo leaf ash by stir casting method 被引量:3
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作者 B.Praveen KUMAR Anil Kumar BIRRU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第12期2555-2572,共18页
Al-4.5%Cu alloy was used as a matrix at2%,4%and6%of bamboo leaf ash(BLA)which was extruded from agro waste and was used as reinforcement.The composite which was fabricated by stir casting method possessed superior pro... Al-4.5%Cu alloy was used as a matrix at2%,4%and6%of bamboo leaf ash(BLA)which was extruded from agro waste and was used as reinforcement.The composite which was fabricated by stir casting method possessed superior properties due to an effective bonding between matrix and reinforcement particles.The fabricated composite specimens were subjected to various tests to determine the mechanical properties such as density,porosity,hardness and tensile strength.The results were compared with basic matrix alloy.Furthermore,the OM,SEM with EDAX and XRD analyses were carried out to analyze the dispersion of the reinforced particles in the selected matrix alloy.It was observed that the homogeneous distribution of BLA particles in composites was intragranular in nature.Moreover,it was also observed that BLA particles were well bonded with matrix alloy with clear interface.It was also found that the density decreased with increase in mass fraction of BLA particles and porosity increased with increase in mass fraction of BLA particles.The hardness and tensile strength were increased up to4%of BLA in the composite,with a further increase in BLA content the hardness and tensile strength decreased. 展开更多
关键词 Al-4.5Cu alloy stir casting composites bamboo leaf ash DENSITY POROSITY
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Analysis of Cutout Fiber as Source of Delamination in Composites System Using FEM
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作者 Ramadan A. Al-Madani Aimen. Elmahmody M. Jamaz 《Journal of Chemistry and Chemical Engineering》 2013年第1期34-39,共6页
Delamination in composite structures can be a serious threat to the safety of the structure. Delamination leads to loss of stiffness and strength of laminates under some conditions. This is particularly so in the case... Delamination in composite structures can be a serious threat to the safety of the structure. Delamination leads to loss of stiffness and strength of laminates under some conditions. This is particularly so in the case of compressively loaded structures as the loss of stiffness may lead to separation of layers, the consequences of which can be catastrophic. Causes of delamination are many. In aerospace applications, this includes manufacturing defects, as well as operationally induced defects such as bird strikes, hits due to runway debris and tool drops. In this work one of the main causes of delamination that is dealt with, is the one that redistribution of the stress state due to some defects all mostly like here is broken single fiber (cutout fiber) in composite system already initiated by one of the above causes. When a laminate is subjected to in-plane tension, the effects of delamination on the stiffness and strength may be characterized by analytical results concerning the onset of delamination growth and its subsequent development. Many of the analytical treatments deal with just free-edge delamination. In mean time the redistribution and the gradient of the stress state in composite system is playing an important role for causing delamination. The main task of this work is to analyze single fiber with and without cutout embedded in matrix. Different FE models were generated, from the results, the redistribution of the stress state around the defected fiber were presented and discussed. Finally concluded remarks were indicated. 展开更多
关键词 Composite materials interlaminar stress delamination.
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