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Trans. Nonferrous Met. Soc. China 29(2019) 1510-1515 Synthesis of Cu nanoparticles by chemical reduction method M. S. AGUILAR1, R. ESPARZA2, G. ROSAS1 1. Instituto de Investigacion en Metalurgia y... Abstract: Cu nanoparticles (CuNPs) have been synthesized through an easy route by chemical reduction at room temperature. The Cu2+ ions were reduced and stabilized with sodium borohydride......
Trans. Nonferrous Met. Soc. China 24(2014) 605-610 Effects of Cu addition on microstructure and mechanical properties of as-cast magnesium alloy ZK60 Hong-mei ZHU1,2, Cheng-ping LUO2, Jiang-wen LIU 2..., Guangzhou 510640, China Received 27 March 2013; accepted 11 October 2013 Abstract: The effects of Cu addition on the microstructure and mechanical properties of the as-cast magnesium alloy ZK60 were......
at pH 7. However, Cu particles could not be prepared at pH 9 or 11. The average size of Cu2O particles can affect that of Cu particles. Larger Cu2O particles result in larger Cu particles. In addition...pH和Cu2O平均粒径对纳米铜颗粒制备的影响.在溶液pH值为3,5和7时,可制得铜颗粒,并且在pH=7时制得的铜颗粒粒径最小.在溶液pH为9和11时无法制得铜颗粒.Cu2O的平均粒径能影响铜粉的粒径.Cu2O的平均粒径越大,得到的铜颗粒越大.通过对反应过程中不同时间点收集的样品进行XRD分析,可探索出反应的进程.在反应过程中,Cu(OH)2首先作为前驱体出现,然后被还原为Cu2O,最后被还原为铜颗粒......
of the solutions and then this Cu(OH)2 is reduced by the addition of NaBH4 solution. References [1] Dan V G, EGON M. Preparation of monodispersed metal particles [J]. New J Chem, 1998, 22(11...学研究科 材料科学专业,名古屋 4648603,日本 摘 要:在碱性溶液中用NaBH4还原Cu2+制备纳米铜颗粒,研究NaBH4浓度和滴加速率对Cu纳米颗粒制备的影响.反应的最佳条件是:0.2 mol/L Cu2+,溶液pH 12,温度313 K,1%明胶作为分散剂,将0.4 mol/L NaBH4溶液以50 mL /min的速率加入CuSO4溶液中.氨水是最佳的络合剂.采用一系列实验研究不同时间......
可达98%左右,Cu直收率为97.60%,杂质元素Pb,Sb,Sn和As含量分别降至0.005 8%,1.02%,0.002 3%和0.039%,脱除率分别为99.96%,95.17%,99.94%和99.84%,除杂效果明显好于直接真空蒸馏.残余物经吹炼可得能够适用于电解的阳极铜.关键词:真空蒸馏;硫化;铜砷锑多元合金;回收CuRecovering Cu from Cu-As-Sb multi...-component alloy to recover valuable metal Cu by sulfuration-vacuum distillation was theoretically analyzed. The effects of addition of sulphur, distillation temperature and distillation time......
of the materials under the action of an electrical current. In addition, the increase of electrical current results in an increase in the melting dripping and deformation for pure Cu bulk, the surface... Effect of electrical current on tribological property of Cu matrix composite reinforced by carbon nanotubes XU Wei1, 2, HU Rui1, LI Jin-shan1, FU Heng-zhi1 1. State Key Laboratory......
), the dislocation density ρ and the twin density β are illustrated in Figs. 3 and 4, respectively. Fig. 1 Optical micrographs of Cu-4.5%Al before (a) and after (b) rolling Fig. 2 XRD patterns for Cu, Cu-2.2%Al and Cu-4.5%Al after multiple passes cold-rolling Fig. 3 XRD-measured crystallite size and microstrains of multiple passes cold-rolling processed Cu, Cu-2.2%Al and Cu-4.5%Al Fig. 4......
80 MPa,峰值时效时间则推迟到77 h.J4合金的强度最低,抗拉强度仅有235.1 MPa,屈服强度仅为184.4 MPa,与J3合金的相差120 MPa,一直到196 h都没有明显的峰值时效位置. 图2 不同Cu含量合金的拉伸性能曲线 2.3 均匀化后的SEM组织特征 图3所示为不同Cu含量合金均匀化态的SEM像.从图3中可以看出,不同铜含量合金中的组织形貌差别非常大....从Al-Cu-Sc三元相图[13]也可以得到,在高铜低钪成分范围内,就会有W相形成,在低铜高钪成分范围内,不会存在W相的相区,而是存在Al3Sc相的相区.CHEN等[10]在Al-2.5Cu-0.3Sc合金中没有发现W相,这是由于上述合金体系w(Cu)/w(Sc)仅有8.3,Cu含量较低,Sc含量较高,不会形成W相.所以,在含Sc的Al-Cu合金内,当Cu含量较高时,比较容易形成W相,确切地说......
performed to discover the reaction process. NH3·H2O was found to be able to modulate the reaction process. At pH=10, Cu2+ was transformed to Cu(NH3)42+ as precursor after the addition of NH3·H2O, and then Cu(NH3)42+ was reduced by NaBH4 solution. At pH=12, Cu2+ was transformed to Cu(OH)2 as precursor after the addition of NH3·H2O, and Cu(OH)2 was then reduced by NaBH4 solution. Key words: Cu......
] with the same preparation method. The reason can be ascribed to that the addition of Cu ions would reduce the sintering temperature and result in a reduction of Fe2+, which suppresses the opportunities...Trans. Nonferrous Met. Soc. China 25(2015) 3678-3684 Effect of Cu ion substitution on structural and dielectric properties of Ni-Zn ferrites Guang-sheng LUO1,2,3, Wei-ping ZHOU1,2,4, Jian-de LI3, Gui......